预览加载中，请您耐心等待几秒...

短路计算实例.pdf

预览
1/10
2/10
3/10
4/10
5/10
6/10
7/10
8/10
9/10
10/10

亲，该文档总共11页，到这已经超出免费预览范围，如果喜欢就直接下载吧～

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

短路计算书如下图，各级水电站的系统接线图：说明：（1）、忽略系统归算至35KV侧阻抗（2）、忽略二级电站至一级电站线路阻抗1×16000KVA（3）、忽略夹水电站至三级电站的线路阻抗U%=18Ⅰ-Ⅱ（4）、忽略五级站至茅庵变的线路阻抗U%=10.5（5）、将所有电源点看作是无穷大电源Ⅰ-ⅢU%=6.5（6）、所有发电机功率因素取0.8，次暂态电抗取0.2Ⅱ-ⅢLGJ-95LGJ-120LGJ-1204.13km6.2km2.2kmxx=0.4?/kmx=0.4?/km1=0.444?/km235000KVAUk5%=74000KVA4000KVA8000KVA6300KVAUk1%=7Uk2%=7Uk3%=7.5Uk4%=7.52×1600KW+1×1250KW3×500KW3×1450KW2×500KW2×2150KW2×1600KW系统等值网络化简：110KVXa0.688Xc10KV-0.031Xb0.438XL2XL30.1810.064XL10.134d4d5d6XT1XT2XT3XT4XT51.7501.7500.9381.1901.400d1d2d3XXXG1XG2XG3G4G55.0005.8192.9913.7215.00012345-1-等值电路各元件参数归算过程：1、发电机S100XXB0.25G1dS(21.6)N10.8S100100XXB0.20.25.819G2dS1.2530.5N20.8S100100XXB0.20.22.991G3dS31.4520.5N30.80.8S100XXB0.23.721G4dS(22.15)N40.8S100XXB0.25G5dS(21.6)N50.82、变压器U(%)S7100XK1B1.75T1100S1004N1U(%)S7100XK2B1.75T2100S1004N2U(%)S7.5100XK3B0.938T3100S1008N3U(%)S7.5100XK4B1.19T4100S1006.3N4U(%)S7100XK1B1.4T5100S1005N51SX(XXX)Ba2高-中高-低中-低SN1100(0.180.1050.065)0.688216-2-1SX(XXX)Bb2高-中中-低高-低SN1100(0.180.0650.105)0.4382161SX(XXX)Bc2高-低中-低高-中SN1100(0.1050.0650.18)-0.0312163、线路：S100XxlB0.4444.130.134L111U2372NS100XxlB0.46.20.181L222U2372NS100XxlB0.42.20.064L333U2372N（一）、d处短路时【即一级电站6.3KV母线短路】1XXXXXXsfabL2L1T10.6880.4380.1810.1341.752.831XX51fG1XXXX5.8191.751.759.3192fG2T2T1XXXXX3fG3T3L1T12.9910.9380.1341.755.813XXXXXXX4fG4T4L3L2L1T13.7211.190.0640.1810.1341.757.04XXXXXX5fG5T5L2L1T151.40.1810.1341.758.465对应的各短路电流标幺值：-3-I110.353sX2.831sfI110.21X51fI110.1072X9.3192fI110.1723X5.8133fI110.1424X7.044fI110.1185X8.4655f对应的有名值为：S100IIB0.3530.551KAss3U337NS100IIB0.20.312KA113U337NS100IIB0.1070.167KA223U337NS100IIB0.1720.268KA333U337NS100IIB0.1420.222KA443U337NS100IIB0.1180.184KA553U337N故一级电站6.3KV母线上最大短路电流为：IIIIIIIs123450.5510.3120.1670.2680.2220.1841.704KA（二）、d2处短路时【即三级电站6.3KV母线