年发输变电专业案例上午下午.pdfVIP

2014 骞存渚嬩笂鍗 涓€搴ц繙绂诲彂鐢靛巶涓庢棤绌峰ぇ绯荤粺杩炴帴鐨勫彉鐢电珯锛屽叾鐢垫皵涓绘帴绾垮涓嬪浘鎵€绀猴細 鍙樼數绔欎綅浜庢捣鎷旈珮搴?000 绫充箣澶勶紝鍙樼數绔欒鏈変袱鍙?1500kVA 锛堟湁1.3 鍊嶈繃璐熻嵎鑳藉姏锛夛紝110/10kV 涓诲彉鍘嬪櫒銆傛甯歌繍琛屾椂鐢垫簮3 涓庣數婧? 鍦 110kV 鈪犲彿姣嶇嚎骞剁綉锛岃繍琛?10kV銆?0kV 姣嶇嚎鍒嗚杩愯锛 褰撲竴娈垫瘝绾垮け鍘荤數婧愭椂锛屽垎娈垫柇璺櫒鎶曞叆杩愯銆傜數婧? 鍚慸1 鐐规彁渚涚殑鏈€澶т笁鐩哥煭璺數娴佷负4kA 锛岀數 婧? 鍚慸2 鐐规彁渚涚殑鏈€澶т笁鐩哥煭璺數娴佷负3kA锛岀數婧? 鍚慸3 鐐规彁渚涚殑鏈€澶т笁鐩哥煭璺數娴佷负5kA銆 110kV 鐢垫簮绾胯矾涓讳繚鎶ゅ潎涓哄厜绾ょ旱宸繚鎶わ紝淇濇姢鍔ㄤ綔鏃堕棿涓? 绉掋€傛灦绌虹嚎璺紵鐢电紗绾胯矾 1 涓や晶鐨勫悗 澶囦繚鎶ゅ潎涓烘柟鍚戣繃鐢垫祦淇濇姢锛屾柟鍚戞寚鍚戠嚎璺殑鍔ㄤ綔鏃堕棿涓? 绉掞紝鏂瑰悜鎸囧悜110kV 姣嶇嚎鐨勫姩浣滄椂闂翠负 2.5 绉掋€備富鍙橀厤缃殑宸姩淇濇姢鍔ㄤ綔鏃堕棿涓?.1 绉掋€傞珮鍘嬩晶杩囨祦淇濇姢鍔ㄤ綔鏃堕棿涓 1.5 绉掋€?10kV 鏂矾鍣 鍏ㄥ垎闂告椂闂翠负50ms 銆 1銆佽绠楁柇璺櫒CB1 鍜孋B2 鍥炶矾鐨勭煭璺數娴佺儹鏁堝簲鍊煎簲涓轰笅鍒楀摢缁勶紵 2 2 2 2 锛圓 锛?8kA s銆?8kA s 锛圔 锛?2.95kA s銆?2kA s 2 2 2 2 锛圕 锛?0.8kA s銆?2.8kA s 锛圖 锛?0.8kA s銆?2.95kA s 绛旀銆 C 銆 渚濈數姘旇璁℃墜鍐? 绗?-8 鑺傦細 Q = I2t ; QCB 1 = 42 脳 (2.5 + 0.05) = 40.8 ; QCB 1 = 42 脳 (2.0 + 0.05) = 32.8 2 銆佸2 鍙蜂富鍙?10kV 鏂矾鍣ㄤ笌110kV 渚у绠￠棿閲囩敤鐙珛CT锛?10kV 渚у绠′笌鐙珛CT 涔嬮棿涓鸿蒋瀵 绾胯繛鎺ワ紝璁＄畻璇ュ绾跨殑鐭矾鐢垫祦鐑晥搴旇绠楀€煎簲涓轰笅鍒楀摢椤规暟鍊硷紵 2 2 2 2 锛圓 锛?.35kA s; 锛圔 锛 9.6kA s 锛圕 锛?7.5kA s 锛圖 锛?3.5kA s 绛旀銆 A 銆 渚濈數姘旇璁℃墜鍐? 绗?-8 鑺傦細 2 Q = I2t ; Q = 锛? + 3 锛 脳 (0.1 + 0.05) = 7.35 3銆佽嫢鐢ㄤ富鍙?0kV渚т覆鑱旂數鎶楀櫒鐨勬柟寮忥紝灏嗚鍙樼數绔欑殑10kV姣嶇嚎鏈€澶т笁鐩哥煭璺數娴?0kA 闄嶅埌20kA 锛 璇疯绠楃數鎶楀櫒鐨勯瀹氱數娴佸拰鐢垫姉鐧惧垎鍊煎簲涓轰笅鍒楀摢缁勬暟鍊硷紵 锛圓 锛?732.1A锛?.07% 锛圔 锛?818.7A锛?.18% 锛圕 锛?251.7A 锛?.95% 锛圖 锛?364.3A 锛?.14% 绛旀銆 D 銆 渚濈數姘旇璁℃墜鍐? 绗?-6 鑺傦細 鐢垫姉鍣ㄧ殑棰濆畾鐢垫祦灏辨寜鍥炶矾鏈€澶у伐浣滅數娴侀€夋嫨锛欼e = 1.3IBe = 1.3 脳 31500 = 2364.3A 鈭?脳10 Ij Iek Uj 9.16 9.16 2.3643 10.5 鐢垫姉鐧惧垎鍊硷細Xk % 鈮ワ拷 鈭扻鈭梛 锟 脳 100% = 锟 鈭 锟矫 脳 脳 100% = 4.14% I U