<p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:557px;display:inline-block;"><span><img width="557" height="418" src="http://cfile10.uf.tistory.com/image/265303505549B6EA297343" alt=""><span class="ExifInfo" style="width:557px;margin-left:auto;display:block;margin-right:auto;">Samsung Techwin<span class="exifBar"> | </span>Digimax L80 / Kenox X80<span class="exifBar"> | </span>Normal program<span class="exifBar"> | </span>Pattern<span class="exifBar"> | </span>1/10sec<span class="exifBar"> | </span>F/2.8<span class="exifBar"> | </span>0.00 EV<span class="exifBar"> | </span>7.4mm<span class="exifBar"> | </span>ISO-123<span class="exifBar"> | </span>Off Compulsory<span class="exifBar"> | </span>2008:04:15 10:12:18</span></span></span></p> <p style="float:none;text-align:center;clear:none;"><br><span style="height:1px;width:1px;float:right;"></span></p> <p style="float:none;text-align:center;clear:none;"><br></p> <p style="float:none;text-align:center;clear:none;"><br></p> <p style="float:none;text-align:center;clear:none;"><br></p> <p><br></p> <p><span style="font-size:9pt;line-height:1.5;"><br></span></p> <p><br></p> <p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:630px;display:inline-block;"><span><img width="630" height="893" src="http://cfile29.uf.tistory.com/image/253EEC3D55499B71087063" alt=""></span></span></p> <p><br></p> <p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:630px;display:inline-block;"><span><img width="630" height="893" src="http://cfile22.uf.tistory.com/image/224A023D55499B7401C1F0" alt=""></span></span></p> <p><br></p> <p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:630px;display:inline-block;"><span><img width="630" height="893" src="http://cfile27.uf.tistory.com/image/257AF13D55499B7732F6C5" alt=""></span></span></p> <p><br></p> <p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:630px;display:inline-block;"><span><img width="630" height="893" src="http://cfile9.uf.tistory.com/image/252DA73D55499B79137B67" alt=""></span></span></p> <p><br></p> <p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:630px;display:inline-block;"><span><img width="630" height="891" src="http://cfile6.uf.tistory.com/image/213C393D55499B7C092176" alt=""></span></span></p> <p><br></p> <p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:630px;display:inline-block;"><span><img width="630" height="892" src="http://cfile5.uf.tistory.com/image/2241BC3D55499B7F066432" alt=""></span></span></p> <p><br></p> <p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:630px;display:inline-block;"><span><img width="630" height="890" src="http://cfile3.uf.tistory.com/image/24424C3D55499B81069389" alt=""></span></span></p> <p><br></p> <p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:630px;display:inline-block;"><span><img width="630" height="889" src="http://cfile21.uf.tistory.com/image/22091E4655499B831C9AA5" alt=""></span></span></p> <p style="float:none;text-align:center;clear:none;"><span class="imageblock" style="height:auto;width:630px;display:inline-block;"><span><br></span></span></p> <p>수정사항 </p> <p></p> <p><br></p> <p><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;">1번의 2)번 문제에서 효율의 위치와 안정도의 위치가 바뀌지 않았나 생각됩니다</span><br style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;">12번 PLC문제에서 Step 0은 주어진 값이었습니다</span><br style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;">14번 가)나)의 순서가 바뀐것같습니다</span><br style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;">16번 같은경우는 실제로 시험장에서 보았던 표의 효율역률이 전혀 다른값 같습니다</span><br style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;">그리고 답안의 전등 효율도 100으로 표기되엇던것으로 기억합니다</span><br style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;">그래서 합계가 189.94였고 200KVA산정했던것으로 기억하고있습니다</span><br style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"></p> <p><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><br></span></p> <p><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><br></span></p> <p><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><br></span></p> <p><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><br></span></p> <p><span style="font-family:'돋움', dotum, Helvetica, sans-serif;line-height:16.79px;background-color:#f9f9f9;"><br></span></p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><span style="font-size:24pt;"><strong>2015년 전기기사 2회 실기 가답안</strong></span></p> <p align="right" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:right;"><span style="font-size:12pt;"></span></p> <p align="right" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:right;"><span style="font-size:12pt;"></span><span style="font-size:12pt;">by 남기사(한국전기학원 & 부천전기학원 강사)</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#3a32c3;">준 내용은 2015년 7월12일 전기기사 실기시험을 친 학생들의 기억을 근거로 일부만 복구된 것입니다,</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#3a32c3;">기억에 의존한 것이라 </span><span style="color:#3a32c3;">계산식문제는 수치가 다를 수도 있으므로</span><span style="color:#3a32c3;"> <span style="font-size:14pt;"><span style="font-size:18pt;">'답'보다는 '풀이과정'을</span> </span></span><span style="color:#3a32c3;">참고하세요^^!</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><strong>문제1_복원률100%> 3상 농형 유도전동기 부하가 다음 표와 같을때 간선의 굵기를 구하려고 한다. 주어진 참고표의 해당부분을 적용시켜 간선의 최소 전선굵기를 구하시오. 단, 배선은 공사방법 B1에 의하고 전선은 PVC절연전선을 사용하도록 한다.</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><br></span></p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><img src="http://postfiles2.naver.net/20150713_177/nst4309_1436754788156Wv8oH_JPEG/20150713_112414%280%29.jpg?type=w2" width="607" height="849" alt="" class="_photoImage" style="border:none rgb(0,0,0);"></p> <div align="center" style="line-height:16.3636360168457px;font-family:'돋움';text-align:center;"></div> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"> </p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"> </p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">풀이> 전동기만 있는 경우에서 표를 이용하여 간선의 굵기를 구하는 문제이므로 간선의 최소굵기는 단순한 <<strong><u>전동기수의 총계>에 의존</u></strong> 한다.(예를들어 모터와 히터등이 함께 있으면 그때 비로소 표의 <최대사용전류>도 겸하여 고려해야 하는 것이다.) 따라서,</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"></span></p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><span style="color:#0075c8;font-size:12pt;"><strong>전동기[kW]수의 총계=22+7.5+5.5+1.5+0.75=37.25[kW]</strong></span></p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><span style="font-size:12pt;"><br></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">이므로 표의 37.5[kW]와 공사방법 B1의 PVC난에서 70[sq]를 선정한다. <strong><span style="font-size:14pt;">∴ <span style="color:#ff0000;">정</span></span><span style="color:#ff0000;font-size:14pt;">답: 70[㎟]</span></strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="font-size:12pt;">문제2_복원률100%> </span><span style="letter-spacing:-.1pt;font-size:12pt;">전로의 절연내력구하기. </span><span style="letter-spacing:-.1pt;font-size:12pt;">변압기</span><span style="letter-spacing:-.1pt;font-size:12pt;">의 전로는 다음 표</span><span style="letter-spacing:-.1pt;font-size:12pt;">에서 정하는 시험전압 및 시험방법으로 절연내력을 시험하였을 때에 이에 견디어야 한다.</span></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:1.5;"><span style="font-size:12pt;">1.</span><span style="letter-spacing:-.5pt;font-size:12pt;">최대사용전압 7,000V </span><span style="letter-spacing:-.5pt;font-size:12pt;">이하</span></p> <p align="left" style="margin:0px;padding:0px;line-height:1.5;"><span style="color:#ff0000;font-size:14pt;"><strong>:1.5배</strong></span><span style="letter-spacing:-.5pt;"></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="letter-spacing:-.1pt;font-size:12pt;"><br></span></p> <p align="left" style="margin:0px;padding:0px;line-height:1.5;"><span style="font-family:'돋움', dotum;font-size:12pt;">2.</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">최대사용전압 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">7,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V </span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">초과 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">25,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">이하의 권선으로서 중성점접지식전로</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">(</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">중선선을</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">가지는 것으로서 그 중성선에 다중접지를 하는 것에 한한다</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">)</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">에 접속하는 것</span></p> <p align="left" style="margin:0px;padding:0px;line-height:1.5;"><span style="color:#ff0000;font-size:14pt;"><strong>:0.92배</strong></span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;"></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:1.5;"><span style="font-family:'돋움', dotum;font-size:12pt;"></span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">3.</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">최대사용전압 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">7,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V </span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">초과 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">60,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V </span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">이하의 권선</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">(단, 중성점 다중접지식은 제외</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">)</span></p> <p align="left" style="margin:0px;padding:0px;line-height:1.5;"><span style="color:#ff0000;font-size:14pt;"><strong>:1.25배</strong></span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;"></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">4.</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">최대사용전압이 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">60,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">를 초과하는 권선으로서 중성점 비접지식 전로</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">(</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">전위 변성기를 사용하여 접지하는 것을 포함한다</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">.</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">8</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">란의 것을 제외한다</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">)</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">에 접속하는 것</span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span style="color:#ff0000;font-size:14pt;"><strong>:1.25배</strong></span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><br></p> <p align="left" class="1" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">5.</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">최대사용전압이 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">60,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">를 초과하는 권선</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">(</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">성형결선</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">, </span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">또는 스콧결선의 것에 한한다</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">)</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">으로서 중성점 접지식 전로</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">에 접속하고 또한 성형결선</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">의</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">권선의 경우에는 그 중성점에</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">, </span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">스콧결선의 권선의 경우에는 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">T</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">좌 권선과 주좌 권선의 접속점에 피뢰기를 시설하는 것</span></p> <p align="left" class="1" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span style="color:#ff0000;font-size:14pt;"><strong>:1.1배</strong></span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;"></span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;"></span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">6.</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">최대사용전압이 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">60,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">를 초과하는 권선</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">으로서 중성점 직접접지식전로에</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">접속하는 것</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">. </span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">다만</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">, 170,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">를 초과하는 권선에는 그 중성점에 피뢰기를 시설하는 것에 한한다</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">.</span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span lang="en-us" style="color:#ff0000;letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:14pt;"><strong>:0.72배</strong></span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;"></span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">7.</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">최대사용전압이 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">170,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">를 초과하는 권선</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">으로서 중성점직접접지식 전로에 접속하고 또한 그 중성점을 직접 접지하는 것</span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span style="color:#ff0000;font-size:14pt;"><strong>:0.64배</strong></span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;"></span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;"></span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">8.</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">최대사용전압이 </span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">60,000</span><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">V</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">를 초과하는 정류기에 접속하는 권선</span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span style="color:#ff0000;font-size:14pt;"><strong>:1.1배</strong></span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;"></span></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><br></p> <p align="left" style="margin:0px 0px 0px 7.4pt;padding:0px;line-height:15.600001335144px;font-family:'돋움';text-indent:-7.4pt;"><span style="letter-spacing:-.5pt;"><br></span></p> <p align="left" style="margin:0px;padding:0px;line-height:15.600001335144px;font-family:'돋움';"><span lang="en-us" style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">예시.</span><span style="letter-spacing:-.5pt;font-family:'돋움', dotum;font-size:12pt;">기타 권선</span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">:1.1배</span> </p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="font-size:12pt;">문제 3_복원률100%> 부하전류가 65[</span><span style="font-size:12pt;">A]인 전로에 CT비가 100/5인 변류기에 과전류계전기를 삽입하여 계통을 보호</span><span style="font-size:12pt;">하고자 한다. 이때 과전류계전기의 탭전류는 얼마인가? 단, 계전기는 </span><span style="font-size:12pt;">120%과부하까지는 동작하지 않도록 한다.</span></strong><span style="font-size:12pt;"> </span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">풀이></span> </p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><strong><span style="color:#0075c8;font-size:12pt;">I2 </span><span style="color:#0075c8;font-size:12pt;">= I1 </span><span style="color:#0075c8;font-size:12pt;">× (1/CT비) </span><span style="color:#0075c8;font-size:12pt;">× 1.2 = 65 <span style="font-size:12pt;">× (5/100) <span style="font-size:12pt;">× 1.2 = 3.9 [A]</span></span></span></strong></p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><span style="font-size:12pt;"><br></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">계전기의 탭전류는 <strong><u>정수</u></strong> 4, 5, 6, 7, 8, 9, 10, 11, 12...로 나가므로,</span></p> <p align="right" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:right;"><span style="font-size:12pt;"><span style="font-size:12pt;"><span style="font-size:12pt;"><strong><span style="font-size:14pt;">∴ <span style="color:#ff0000;">정</span></span><span style="color:#ff0000;font-size:14pt;">답: 4[A]</span></strong></span></span></span> </p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"></span> </p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><strong>문제 4_복원률100%> 코로나임계전압에 대하여 다음사항들에 대한 영향을 쓰시오.</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">풀이> 코로나임계전압이 '높아야' 계통에 좋은 것이다. '낮으면' 계통에 나쁜것이다.<br></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">1.전선: <span style="color:#ff0000;font-size:14pt;"><strong>전선의 굵기가 커지면 임계전압이 높아진다.</strong></span> </span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">(근거: 코로나임계전압을 높이고자 다도체방식이나 굵은 전선을 사용함)</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><br></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">2.기온: <strong><span style="color:#ff0000;font-size:14pt;">기온이 높아지면 임계전압은 낮아진다.</span></strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">(근거: 주변온도가 상승하면 상대공기밀도가 작아지므로 임계전압도 낮아진다. <font size="2"><span style="font-family:'돋움', dotum;font-size:12pt;">δ(기압을 b(mmHg), 기온을 t℃라 하면)는 </span><font size="2"><span style="font-family:'돋움', dotum;font-size:12pt;">δ=(0.386b/273.15+t)</span></font></font>)</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><br></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">3.선간거리: <span style="color:#ff0000;font-size:14pt;"><strong>선간거리가 멀수록 임계전압은 높아진다.</strong></span></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">(근거: 임계전압식인 Eo=24.3 m0m1 δd log(D/r))에서 임계전압Eo와 선간거리D는 비례관계)</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><br></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">4.표고: <span style="color:#ff0000;font-size:14pt;"><strong>표고가 높을수록 임계전압은 낮아진다.</strong></span></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">(근거: 위 <span style="font-family:'돋움', dotum;font-size:12pt;">식에서 상대공기밀도 </span><font size="2"><span style="font-family:'돋움', dotum;font-size:12pt;">δ(기압을 b(mmHg), 기온을 t℃라 하면)는 </span><font size="2"><span style="font-family:'돋움', dotum;font-size:12pt;">δ=(0.386b/273.15+t) 관계에 있으므로 표고가 높아질수록 기압b가 낮아져 임계전압도 낮아짐을 알 수 있다.)</span></font></font></span></p> <table class="__se_tbl_ext" border="1" cellspacing="0"><tbody><tr><td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">표고m</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">0</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">500</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">1000</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">1500</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">2000</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">2500</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">3000</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">3500</font></p></td></tr><tr><td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">기압 b<br>[mmHg]</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">760</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">711</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">668</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">627</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">590</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">555</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">521</font></p></td> <td width="40"> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><font size="2">489</font></p></td></tr></tbody></table><p style="margin:0px;padding:0px;line-height:1.5;"> </p> <p style="margin:0px;padding:0px;line-height:1.5;"><br></p> <p style="margin:0px;padding:0px;line-height:1.5;"><br></p> <p style="margin:0px;padding:0px;line-height:1.5;"><span style="font-size:12pt;"><strong>문제 5_복원률100%> 조명설계에 있어 감광보상률이란 무엇인지 쓰시오.</strong></span><span style="font-size:12pt;"><br></span></p> <p style="margin:0px;padding:0px;line-height:1.5;"><span style="font-size:12pt;">정답:<strong> <span style="color:#ff0000;">조명설계시 조도의 감소를 예상하여 소요광속에 '여유'를 주는 것으로 유지율의 역수이다.</span></strong></span></p> <p style="margin:0px;padding:0px;line-height:1.5;"><span style="font-size:12pt;"><strong><br></strong></span></p> <p style="margin:0px;padding:0px;line-height:1.5;"><font size="2"><br></font></p> <p style="margin:0px;padding:0px;line-height:1.5;"><font size="2"><br></font></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong>문제6_복원률100%> 지중배전선로에 전력케이블의 고장점 측정방법 3가지와 각각의 역할에 대하여 쓰시오.</strong></p> <p style="margin:0px;padding:0px;line-height:1.5;"><br></p> <p style="margin:0px;padding:0px;line-height:1.5;">1) <span style="color:#ff0000;"><strong>머레이루프법: 1선지락사고 및 선간단락사고 측정</strong></span></p> <p style="margin:0px;padding:0px;line-height:1.5;">2) <strong><span style="color:#ff0000;">정전브리법: 단선사고 측정</span></strong></p> <p style="margin:0px;padding:0px;line-height:1.5;">3) <span style="color:#ff0000;"><strong>펄스레이다법: 3선단락사고 측정</strong></span><br></p> <p style="margin:0px;padding:0px;line-height:1.5;"> </p> <p style="margin:0px;padding:0px;line-height:1.5;"><br></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong>문제7> 아래 그림은 단상2선식 수전전압이 6000[V]인 전로에 연결된 용량 180[kW], 역률 0.6인 부하이다. 한선의 저항이 0.15[Ω], 리액턴스가 0.1[Ω]일때 부하측에 병렬로 콘덴서를 삽입하여 부하역률을 1로 개선한다면 개선전 전력손실과 개선후의 전력손실의 차는 얼마인지 계산하시오.</strong></p> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><img src="http://postfiles5.naver.net/20150713_36/nst4309_1436767511011dKmP4_PNG/%C4%B8%C3%B3.PNG?type=w2" width="525" height="278" alt="" class="_photoImage" style="border:none rgb(0,0,0);"></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">풀이></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">단상2선 및 단상3선식 </span><span style="font-size:12pt;">전력손실공식: </span> <img src="http://images.se2.naver.com/smedit/2015/7/13/ic1ieh11cfn8xi.jpg" class="__se_object" alt="Pl%3D2%5Ccombi%20%5E%7B%202%20%7D%7B%20I%20%7DR%20" style="border:none rgb(0,0,0);width:87px;height:34px;"> <span style="font-size:12pt;">이고,</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">3상3선식 및 3상4선식 전력손실공식: <img src="http://images.se2.naver.com/smedit/2015/7/13/ic1ifvnl8xbl7n.jpg" class="__se_object" alt="Pl%3D3%5Ccombi%20%5E%7B%202%20%7D%7B%20I%20%7DR%20" style="border:none rgb(0,0,0);width:87px;height:34px;"></span> <span style="font-size:12pt;">임을 알아야 한다.</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">따라서 당해문제는 단상2선식이므로 "<strong><span style="color:#ff0000;"><u>단상2선식</u></span></strong>" 전력손실공식에 의하여,</span></p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><img src="http://images.se2.naver.com/smedit/2015/7/13/ic1im4tq7v9ehk.jpg" class="__se_object" alt="%EC%97%AD%EB%A5%A0%5Cquad%20%EA%B0%9C%EC%84%A0%EC%A0%84%5Cquad%20%EC%86%90%EC%8B%A4%5Cquad%20Pl%3D2%5Ccombi%20%5E%7B%202%20%7D%7B%20I%20%7DR%3D2%5Ccombi%20%5E%7B%202%20%7D%7B%20%5Ctimes%20(%5Cfrac%20%7B%20180%5Ctimes%20%5Ccombi%20%5E%7B%203%20%7D%7B%2010%20%7D%20%7D%7B%206000%5Ctimes%200.6%20%7D)%20%7D%5Ctimes%200.15%3D750%5C%5B%20W%5C%5D%20%20" style="border:none rgb(0,0,0);width:584px;height:68px;"></p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><img src="http://images.se2.naver.com/smedit/2015/7/13/ic1io0jnawhoxy.jpg" class="__se_object" alt="%EC%97%AD%EB%A5%A0%5Cquad%20%EA%B0%9C%EC%84%A0%ED%9B%84%5Cquad%20%EC%86%90%EC%8B%A4%5Cquad%20Pl%3D2%5Ccombi%20%5E%7B%202%20%7D%7B%20I%20%7DR%3D2%5Ccombi%20%5E%7B%202%20%7D%7B%20%5Ctimes%20(%5Cfrac%20%7B%20180%5Ctimes%20%5Ccombi%20%5E%7B%203%20%7D%7B%2010%20%7D%20%7D%7B%206000%5Ctimes%201%20%7D)%20%7D%5Ctimes%200.15%3D270%5C%5B%20W%5C%5D%20%20" style="border:none rgb(0,0,0);width:574px;height:68px;"></p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><img src="http://images.se2.naver.com/smedit/2015/7/13/ic1ipq2k95ke5f.jpg" class="__se_object" alt="%5Ctherefore%20%5Cquad%20%EC%A0%84%EB%A0%A5%EC%86%90%EC%8B%A4%5Cquad%20%EC%B0%A8%5Cquad%20%3D%5Cquad%20750-270%3D480%5C%5B%20W%5C%5D%20%20" style="border:none rgb(0,0,0);width:336px;height:26px;"> </p> <p align="right" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:right;"><span style="font-size:12pt;"><span style="font-size:12pt;"><span style="font-size:12pt;"><strong><span style="font-size:14pt;">∴ <span style="color:#ff0000;">정</span></span><span style="color:#ff0000;font-size:14pt;">답: 480[W]</span></strong></span></span></span> </p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><br></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><strong>문제8_복원률100%> 발전소 및 변전소에 사용되는 모선보호방식 4가지를 열거하고 각각에 대하여 설명하시오.</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">정답></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;"><span style="color:#000000;">1)</span><strong>전류차동계전방식</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;">: CT </span><span style="color:#ff0000;font-size:12pt;">2차회로를 차동접속하고 OCR을 설치한 것으로서, 모선내고장에서는 유입전류와 유출전류의 총계는 서로다름을 이용하여 고장을 검출하는 방식</span><span style="color:#ff0000;font-size:12pt;"> </span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;"><span style="color:#000000;">2)</span><strong>전압차동계전방식</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;">: CT 2차회로를 차동접속하고 전압계전기를 설치한 것으로서, 모선내고장에서는 전압계전기에 큰 전압이 인가되어 고장을 검출하는 방식</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;"><span style="color:#000000;">3)</span><strong>위상비교계전방식</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;">: 각 회선의 전류의 위상을 비교하여 모선내고장인지 외부고장인지를 판별하는 방식</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;"><span style="color:#000000;">4)</span><strong>방향비교계전방식</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;">: 각 회선에 전력방향계전기나 거리방향계전기를 설치하여 어느회선으로부터 고장전류의 유입이 있는지 파악하여 모선내고장인지 외부고장인지를 판별하는 방식</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><strong>문제9_복원률100%></strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><strong>1) 주어진 미완성의 Y-</strong><strong>△기동법 주회로를 완성하시오.</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">풀이> 델타결선에 특히 주의할 것. 두가지타입이 있지만 가장 많이 쓰고 있는 아래타입(기동시 돌입전류 및 돌입토크가 낮음)을 사용할 것 </span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><strong>정답></strong></span></p> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><img src="http://postfiles12.naver.net/20150713_203/nst4309_1436770800795k5G9a_PNG/%C4%B8D%C3%B3.PNG?type=w2" width="550" height="344" alt="" class="_photoImage" style="border:none rgb(0,0,0);"></p> <p style="margin:0px;padding:0px;line-height:1.5;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><strong>2) Y-△ 기동법에서 각 기동전류의 변화에 대하여 <u>'기동전류의 비'</u> 를 들어 설명하시오.</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">풀이> '비'를 들어 설명하라고 요구하였으므로 최소한,</span></p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><span style="font-size:12pt;"><img src="http://images.se2.naver.com/smedit/2015/7/13/ic1jmp85fad6ey.jpg" class="__se_object" alt="%5Ccombi%20_%7B%20Y%20%7D%7B%20I%20%7D%5Cquad%20%3D%5Cquad%20%5Cfrac%20%7B%201%20%7D%7B%203%20%7D%5Ccombi%20_%7B%20%5Ctriangle%20%20%7D%7B%20I%20%7D%20" style="border:none rgb(0,0,0);width:101px;height:52px;"></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;">에 대한 수식정도를 써주어야 한다.</span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong>정답></strong> <strong><span style="color:#ff0000;">Iy=(1/3)Id 이므로 Iy시의 </span><span style="color:#ff0000;">기동전류는 Id의 운전전류보다 1/3배로 줄어든다.</span></strong></p> <p style="margin:0px;padding:0px;line-height:1.5;"><br></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong>3) 주회로의 동작이 의도대로 될 수 있도록 제어회로 구성에 대하여 설명하여라.</strong></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong><br></strong></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong><span style="color:#ff0000;">(1) </span><span style="color:#ff0000;">PB(시작버튼)을 누르면 MCY 코일이 여자되고 그 보조접점a에 의해 자기유지하고 MCL코일 및 타이머 T를</span><span style="color:#ff0000;"> 여자시킨다. 전동기는 MCY 및 MCL 주접점에 의하여 Y결선되어 기동한다.</span></strong></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong><span style="color:#ff0000;"><br></span></strong></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong><span style="color:#ff0000;">(2) 타이머 T의 설정시간 후 MCY 코일이 소자되고 MCD 코일이 여자되어 모터는 MCL 및 MCD 주접점에 의해 </span><span style="color:#ff0000;">△결선되어 운전한다.</span></strong></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong><br></strong></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong><span style="color:#ff0000;">(3) MCY 및 MYD 코일 상호간에는 동시투입을 방지할 수 있도록 인터록을 구성하여야 한다.</span></strong></p> <p style="margin:0px;padding:0px;line-height:1.5;"><br></p> <p style="margin:0px;padding:0px;line-height:1.5;"><br></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong>문제10_복원률100%> 그림과 같은 단선계통도를 보고 각 물음에 답하시오. 단, 한국전력측의 <u>전원용량은 500,000[kVA]</u>, 선로손실등 제시되지 않은 조건은 무시하기로 한다.</strong></p> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><img src="http://postfiles15.naver.net/20150713_142/nst4309_1436771686113oRKla_PNG/%C4%B8%C3%B3.PNG?type=w2" width="478" height="521" alt="" class="_photoImage" style="border:none rgb(0,0,0);"></p> <p style="margin:0px;padding:0px;line-height:1.5;"><strong>1) CB2의 정격을 계산하시오.(단, 차단용량은 MVA로 표기하라)</strong></p> <p align="center" style="margin:0px;padding:0px;line-height:1.5;text-align:center;"><img src="http://images.se2.naver.com/smedit/2015/7/13/ic2ep3iw8z2kpq.jpg" class="__se_object" alt="(i)%EC%9D%B4%EB%9F%B0%EA%B2%BD%EC%9A%B0%2C%5Cquad%20%EB%AF%B8%EC%A7%80%EC%88%98%EC%9D%B8%5Cquad%20%ED%95%9C%EC%A0%84%EC%B8%A1%5Cquad%20%25%5Ccombi%20_%7B%20s%20%7D%7B%20Z%20%7D%EB%A5%BC%5Cquad%20%EB%A8%BC%EC%A0%80%5Cquad%20%EA%B5%AC%ED%95%B4%EC%95%BC%5Cquad%20%ED%95%98%EB%AF%80%EB%A1%9C%2C%5C%5C%20Ps%3D%5Cfrac%20%7B%20100%20%7D%7B%20%25Z%20%7DPn%5Cquad%20%5CLeftrightarrow%20%5Cquad%20%25Z%3D%5Cfrac%20%7B%20100%20%7D%7B%20Ps%20%7DPn%3D%5Cfrac%20%7B%20100%20%7D%7B%20500%20%7D3%3D0.6%25%5C%5C%20%5C%5C%20(ii)%EB%94%B0%EB%9D%BC%EC%84%9C%5Cquad%20CB-2%5Cquad%202%EC%B0%A8%EC%B8%A1%EA%B9%8C%EC%A7%80%EC%9D%98%5Cquad%20%ED%95%A9%EC%84%B1%EC%9E%84%ED%94%BC%EB%8D%98%EC%8A%A4%5Cquad%20%25Zo%EB%8A%94%2C%5C%5C%20%25%5Ccombi%20_%7B%200%20%7D%7B%20Z%20%7D%3D0.6%2B6%3D6.6%25%5C%5C%20%5C%5C%20(iii)%EA%B7%B8%EB%9F%AC%EB%AF%80%EB%A1%9C%2C%5Cquad%20CB-2%EC%9D%98%5Cquad%20%EC%B0%A8%EB%8B%A8%EC%9A%A9%EB%9F%89%EC%9D%80%2C%5C%5C%20Ps%3D%5Cfrac%20%7B%20100%20%7D%7B%20%25%5Ccombi%20_%7B%200%20%7D%7B%20Z%20%7D%20%7DPn%3D%5Cfrac%20%7B%20100%20%7D%7B%206.6%20%7D%5Ctimes%203%3D45.45%5C%5B%20MVA%5C%5D%20%20" style="border:none rgb(0,0,0);width:486px;height:312px;"></p> <p align="right" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:right;"><span style="font-size:12pt;"><span style="font-size:12pt;"><span style="font-size:12pt;"><span style="font-size:12pt;"><strong><span style="font-size:14pt;">∴ <span style="color:#ff0000;">정</span></span><span style="color:#ff0000;font-size:14pt;">답: 45.45[MVA]</span></strong></span></span></span></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="font-size:12pt;"><span style="font-size:12pt;"><span style="font-size:12pt;"><span style="font-size:12pt;"><span style="color:#ff0000;font-size:14pt;"></span></span></span></span></span><span style="font-size:12pt;">2) 기기A의 명칭과 기능을 쓰시오.</span></strong></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;"><strong>(1)명칭: 중성점접지저항기</strong></span></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="color:#ff0000;font-size:12pt;"><strong>(2)기능: 지락사고시 지락전류를 억제하고 건전상 전위상승을 억제</strong></span> </p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><br></p> <p style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:justify;"><span style="font-size:12pt;"><strong>문제11_복원률100%> 다음 유접점시퀀스회로를 무접점논리회로로 바꾸어 주어진 표에 작성하여라.</strong></span> </p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><img src="http://postfiles14.naver.net/20150713_109/nst4309_1436780785080Bbub0_PNG/%C4%B8%C3%B3.PNG?type=w2" width="480" height="190" alt="" class="_photoImage" style="border:none rgb(0,0,0);"> </p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><img src="http://postfiles12.naver.net/20150713_187/nst4309_14367886609425dRoV_PNG/%C4%B8%C3%B3.PNG?type=w2" width="740" height="263" alt="" class="_photoImage" style="border:none;"> </p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="font-size:12pt;">문제12> THD(Total Harmonic Distortion</span><span style="font-size:12pt;">)란 무엇인지 그</span><span style="font-size:12pt;"> 정의와 식을 쓰시오.</span></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><br></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">1) </span><span style="font-size:12pt;">정의: </span><strong><span style="color:#ff0000;font-size:12pt;">기본파성분에 대한 나머지 전고조</span><span style="color:#ff0000;font-size:12pt;">파들의 비</span></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="color:#ff0000;font-size:12pt;"><br></span></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">2) 공식: <img src="http://images.se2.naver.com/smedit/2015/7/13/ic1qkkexrlthsk.jpg" class="__se_object" alt="THD%5Cquad%20%3D%5Cquad%20%5Cfrac%20%7B%20%5Csqrt%20%7B%20%5Ccombi%20%5E%7B%202%20%7D%7B%20%5Ccombi%20_%7B%202%20%7D%7B%20I%20%7D%20%7D%2B%5Ccombi%20%5E%7B%202%20%7D%7B%20%5Ccombi%20_%7B%203%20%7D%7B%20I%20%7D%20%7D%2B%5Ccombi%20%5E%7B%202%20%7D%7B%20%5Ccombi%20_%7B%204%20%7D%7B%20I%20%7D%20%7D%2B%5Ccombi%20%5E%7B%202%20%7D%7B%20%5Ccombi%20_%7B%205%20%7D%7B%20I%20%7D%20%7D...%20%7D%20%7D%7B%20%5Ccombi%20_%7B%201%20%7D%7B%20I%20%7D%20%7D%5C%5B%20%25%5C%5D%20%20" style="border:none rgb(0,0,0);width:327px;height:81px;"></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong>문제13_복원률100%> 다음은 축전지 충전방식에 대한 설명이다. 각 설명에 해당하는 충전방식명을 기입하시오.</strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">1) 정류기를 통해 축전지에 충전전류를 공급함과 동시에 부하에도 전류를 공급하는 방식.</span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">정답: <span style="color:#ff0000;font-size:14pt;"><strong>세류충전방식(=트리클충전방식)</strong></span></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">*세류충전방식은 부동충전방식의 일종으로 자기방전량만을 항시 충전할 수 있는 방식이다.</span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><br></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">2) 각 전해조에서 일어나는 전위차를 보정하기 위해 1~3개월마다 정전압으로 10~12시간 충전하여 전해조 용량을 균일화하는 방식.</span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">정답: <span style="color:#ff0000;font-size:14pt;"><strong>균등충전방식</strong></span></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong>문제14_복원률100%></strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong>1) 1차측이 Y, 2차측이 </strong><strong>△인 </strong><strong>주변압기의 내부보호장치로 비율차동계전기를 설치하고자 한다.</strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"></span><span style="font-size:12pt;"><strong>비율차동계전기의 CT결선은 어떻게 해야하는지 적으시오.</strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">정답:<strong> <span style="color:#ff0000;">CT결선은 변압기결선과 반대인 </span><span style="color:#ff0000;">△(1차측)-</span><span style="color:#ff0000;">Y(2차측)로 결선한다.</span></strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong><br></strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong>2) 계통운전중에 CT2차측 기기의 소손으로 교체하고자 할때 가장 먼저 해야 할 일을 적으시오.</strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">정답:<strong> <span style="color:#ff0000;">CT2차측을 단락시킨다.</span></strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong><br></strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong><br></strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="font-size:12pt;"></span></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="font-size:12pt;">문제15> 권선하중이 18[ton], 4분간 12m를 끌어올릴 수 있는 권상용전동기의 용량[kW]을 구하시오. (단, 전동기를 포함한 기중기의 효율은 80%이다.).</span></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="font-size:12pt;">풀이></span><img src="http://images.se2.naver.com/smedit/2015/7/13/ic2dptvwdnf7x7.jpg" class="__se_object" alt="P%3D%5Cfrac%20%7B%20kvW%20%7D%7B%206.12%5Ceta%20%20%7D%3D%5Cfrac%20%7B%201%5Ccdot%20%5Cfrac%20%7B%2012%20%7D%7B%204%20%7D%5Ccdot%2018%20%7D%7B%206.12%5Ccdot%200.8%20%7D%3D11.03%5C%5B%20kW%5C%5D%20%20" style="border:none;width:368px;height:78px;"></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="font-size:12pt;">정답> </span><span style="color:#0075c8;font-size:14pt;"><span style="font-size:12pt;">11.</span>03[kW]_수치정확하지않습니다. 풀이과정만 참조하세요.</span></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><br></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><br></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong> </strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><br></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong>문제16> 설비불평형률에 대한 다음 각 물음에 답하시오. <u>단, 전동기의 출력 [kW]를 입력[kVA]로 환산하면 5.2[kVA]이다</u>. </strong></span> </p> <p align="center" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';text-align:center;"><strong><img src="http://postfiles5.naver.net/20150714_228/nst4309_14368211658713H03Y_PNG/%C4%B8%C3%B3.PNG?type=w2" width="550" height="239" alt="" class="_photoImage" style="border:none rgb(0,0,0);"></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><strong><span style="font-size:12pt;">1) 저압, 고압 및 특별고압수전의 3상3선식 또는 3상4선식에서 불평형 부하의 한도는 단상부하로 계산하여 설비불평형률 몇 [%]이하로 하는 것을 원칙으로 하는가?</span></strong></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">정답: <span style="color:#ff0000;font-size:14pt;"><strong>30%</strong></span></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">2) 위 그림과 같은 3상3선식 440[V]수전인 경우 설비 불평형률을 구하시오.</span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><img src="http://images.se2.naver.com/smedit/2015/7/13/ic2ekue6gzv5y0.jpg" class="__se_object" alt="%EB%B6%88%ED%8F%89%ED%98%95%EB%A5%A0%5C%5B%20%25%5C%5D%20%3D%5Cfrac%20%7B%20%EA%B0%81%EB%B6%80%ED%95%98%EC%84%A4%EB%B9%84%EC%9A%A9%EB%9F%89%EC%9D%98%5Cquad%20%EC%B5%9C%EB%8C%80%EC%99%80%5Cquad%20%EC%B5%9C%EC%86%8C%EC%9D%98%5Cquad%20%EC%B0%A8%5C%5B%20kVA%5C%5D%20%20%7D%7B%20%EC%A0%84%EB%B6%80%ED%95%98%EC%84%A4%EB%B9%84%EC%9A%A9%EB%9F%89%5C%5B%20kVA%5C%5D%20%5Cquad%20%5Ctimes%20%5Cfrac%20%7B%201%20%7D%7B%203%20%7D%20%7D%5Ctimes%20100%20" style="border:none rgb(0,0,0);width:548px;height:78px;"><span style="font-size:12pt;"></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><img src="http://images.se2.naver.com/smedit/2015/7/13/ic2ft9yen06n3t.jpg" class="__se_object" alt="%EB%B6%88%ED%8F%89%ED%98%95%EB%A5%A0%5C%5B%20%25%5C%5D%20%3D%5Cfrac%20%7B%20(2%2B3%2B0.5)-(0.5%2B0.5)%20%7D%7B%20(2%2B3%2B0.5%2B0.5%2B0.5%2B3%2B5.2)%5Ctimes%20%5Cfrac%20%7B%201%20%7D%7B%203%20%7D%20%7D%5Ctimes%20100%3D91.84%5C%5B%20%25%5C%5D%20%20" style="border:none rgb(0,0,0);width:658px;height:78px;"></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">정답: <strong><span style="color:#ff0000;font-size:14pt;">91.84[%]</span></strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong>문제17번> 직류분권전동기 관련문제.</strong></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">1) 역기전력 Eo구하기</span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><img src="http://images.se2.naver.com/smedit/2015/7/13/ic2f49l0d309yj.jpg" class="__se_object" alt="%5Ccombi%20_%7B%200%20%7D%7B%20E%20%7D%3D%5Cquad%20V-Ia%5Ccdot%20Ra%5Cquad%20%5C%5B%20V%5C%5D%20%20" style="border:none rgb(0,0,0);width:170px;height:34px;"><span style="font-size:12pt;"></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;">2) 토크구하기</span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><img src="http://images.se2.naver.com/smedit/2015/7/13/ic2fhuhnqnw8rm.jpg" class="__se_object" alt="T%5C%5B%20kg%5Ccdot%20m%5C%5D%20%3D0.975%5Ctimes%20%5Cfrac%20%7B%20P%20%7D%7B%20N%20%7D%5Cquad%20%5Cquad%20(%EB%8B%A8%2C%5Cquad%20P%EB%8A%94%5Cquad%20%EC%A0%95%EA%B2%A9%EC%B6%9C%EB%A0%A5%5C%5B%20W%5C%5D%20%2C%5Cquad%20N%EC%9D%80%5Cquad%20%ED%9A%8C%EC%A0%84%EC%86%8D%EB%8F%84%5C%5B%20rpm%5C%5D%20)%20" style="border:none rgb(0,0,0);width:605px;height:52px;"></span></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><br></p> <p align="left" style="margin:0px;padding:0px;line-height:16.3636360168457px;font-family:'돋움';"><span style="font-size:12pt;"><strong>문제18번> 옴법계산문제_수치아시는 분 댓글부탁드립니다^^</strong></span></p> <p><span style="font-family:'돋움';text-align:justify;letter-spacing:-.1pt;font-size:12pt;"></span><span style="font-family:'돋움';text-align:justify;letter-spacing:-.1pt;font-size:12pt;"></span><span style="font-family:'돋움';text-align:justify;letter-spacing:-.1pt;font-size:12pt;"></span><span style="font-family:'돋움';line-height:16.3636360168457px;text-align:justify;letter-spacing:-.5pt;"></span><span style="font-family:'돋움';text-align:justify;font-size:12pt;"><font size="2"><span style="font-family:'돋움', dotum;font-size:12pt;"></span></font></span><span style="font-family:'돋움';text-align:justify;font-size:12pt;"></span><span style="font-family:'돋움';text-align:justify;font-size:12pt;"></span><span style="font-family:'돋움';text-align:justify;font-size:12pt;"></span><strong style="font-family:'돋움';line-height:16.3636360168457px;text-align:justify;"></strong></p> <p></p> <p></p> <div class="autosourcing-stub-extra" style="line-height:1.5;"> <p style="margin:11px 0px 7px;padding:0px;line-height:1.5;font-size:12px;font-family:Dotum;font-style:normal;font-weight:normal;"><strong><strong style="padding:0px 7px 0px 0px;">[출처]</strong> <a target="_blank" href="http://blog.naver.com/nst4309/220418522395" target="_blank" style="text-decoration:none;">2015 전기기사 2회 실기 가답안</a><span style="padding:0px 7px 0px 5px;">|</span><strong style="padding:0px 7px 0px 0px;">작성자</strong> <a target="_blank" href="http://blog.naver.com/nst4309" target="_blank" style="text-decoration:none;">남기사</a></strong></p></div>
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