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<P class=바탕글><SPAN style="FONT-FAMILY: 굴림체; FONT-SIZE: 12pt; mso-fareast-font-family: 굴림체; mso-hansi-font-family: 굴림체">12년 3회 18번문제</SPAN></P>
<P class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-ascii-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt">공급전압을 6600[V]로 수전하고자 한다. 수전점에서 계산한 3상 단락용량은 70[MVA]이다</SPAN></SPAN></P>
<P class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-ascii-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt">이 수용 장소에 시설하는 수전용 차단기의 정격차단전류 Is [KA]를 계산하시오</SPAN></SPAN></P>
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<P class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-ascii-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt">①번 풀이방법</SPAN></SPAN></P>
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<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-fareast-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt"> Ps 70 × 10³</SPAN></SPAN></P>
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-ascii-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt">단락전류 Is = -------- = ------------- = 6.12 [KA]</SPAN></SPAN></P>
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-fareast-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt"> √3 Vn √3 × 6.6</SPAN></SPAN></P>
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글><SPAN style="FONT-FAMILY: 굴림체; FONT-SIZE: 10pt; mso-fareast-font-family: 굴림체; mso-hansi-font-family: 굴림체"> </SPAN></P>
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<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글></P></SPAN><SPAN style="FONT-SIZE: 10pt">
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글></P></SPAN><SPAN style="FONT-SIZE: 10pt">
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글></P></SPAN>
<P class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-ascii-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt">②번 풀이방법</SPAN></SPAN></P><SPAN style="FONT-SIZE: 10pt">
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<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-fareast-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt"> Ps 70 × 10³</SPAN></SPAN></P>
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-ascii-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt">단락전류 Is = -------- = --------------- = 5.61 [KA]</SPAN></SPAN></P>
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-fareast-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt"> √3 Vn √3 × 7.2</SPAN></SPAN></P>
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<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글> </P><SPAN style="FONT-SIZE: 10pt">
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글></P></SPAN><SPAN style="FONT-SIZE: 10pt">
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글></P></SPAN>
<P style="LINE-HEIGHT: 100%; LAYOUT-GRID-MODE: char" class=바탕글><SPAN style="FONT-FAMILY: 굴림체; mso-ascii-font-family: 굴림체; mso-hansi-font-family: 굴림체"><SPAN style="FONT-SIZE: 10pt">어느것이 정답인지 부탁드립니다.</SPAN></SPAN></P>
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첫댓글 2번
-정격차단용량[MVA] = 루트3 X 정격전압[KV] X 정격차단전류[KA]
-단락용량[MVA] = 루트3 X 공칭전압[KV] X 단락전류[KA]
* 정격전압 = 공칭전압 X 1.2 / 1.1
답이 없네여 Ps는 혹시 70MVA 아니에요?
그럼 2번이 맞고요
minjuabba님 70MVA 가 맞네요 ,죄송 ㄱㄱ
문제 수정 했습니다.
안녕하세요..이 문제의 답은 1번인것 같네요..
보통 단락전류나 차단전류는 같이 봅니다.
차이가 나는 것은...
단락용량 = 공칭전압 대입
차단용량 = 정격전압 대입...
여기에서는 70MVA가 단락용량이라고 했으므로
전압에는 공칭전압 6600이 그대로 들어가야 할 듯 합니다.
혼동이 많은 부분이므로 정리를 꼭 해주시기 바랍니다.
대단히 심각한 문제네요 정규 교재때는 단락용량,차단용량 차이에 대한 언급이 없었던것 같던데요?