鞍山电网500kV自耦变压器公共绕组过负荷运行工况分析

Analysis of Operating Conditions of Common Winding Overload for 500 kV Autotransformer in Anshan Grid

针对鞍山电网500 k V自耦变压器的运行工况,详细分析了自耦变压器公共绕组过负荷的运行特性;以某变电站实际运行数据为例,分析了功率因数和低压侧无功补偿电容器组容量对公共绕组过负荷的影响。证明了在变压器高压侧和低压侧同时向中压侧输送有功和滞后无功功率的运行方式下,当变压器负荷较大时将导致公共绕组过负荷,使高压侧和中压侧不能满负荷运行;通过提高高压侧功率因数或减小低压侧向中压侧输送的滞后无功功率,消除公共绕组过负荷,提高变压器负载能力。

For the operating conditions of 500 kV autotransformer in Anshan Grid, operational features of autotransformer common winding overload is analyzed in detail; With a practical operation data of substation, the influence of the power faetor and reactive compensation capacity at LV （ l,ow Voltage） side of common winding overload is analyzed. It comes to the conclusion ： when the active and reactive power flows simultaneously from the HV （High Voltage） side and the LV side to the MV （Middle Voltage） side, when the transformer load is heavy, overload will lead to the common winding, the power from the HV winding and the MV winding can not get to their rating value; by improving the power factor of HV side or reducing the reactive power from the LV side to the MV side, the eommon winding overload will be eliminated, the transformer load capacity will increase.