含变阻抗变压器的110kV系统继电保护研究

随着电力系统不断发展,电网容量日益增大,电网工作时所带负荷也日益增大。高容量、高负荷导致线路发生短路故障时的短路电流剧增,从而对线路和通信设备造成很大危害。 为降低短路电流,分析了含变阻抗变压器的110kV电力系统继电保护可能出现的问题,为提高继电保护的灵敏度,提出了自适应保护的新方法,对变阻抗变压器在空投情况下的励磁涌流识别方法做出了可行性分析。根据仿真结果分析得出,传统的继电保护方法能够适应于含变阻抗变压器的 110kV系统,而自适应保护方法能够提高保护的灵敏度。

Research on relay protection of 110 kV power system with variable impedance transformer

With the development of the power system, its capacity daily increases as well as theload. The large capacity and load lead to the sharp increase of the short circuit when the short fault shappened, which caused great damage on the transmission line and the communication equipment. Sothe variable impedance transformer is used to reduce the excessive short-circuit current. The prob-lem was analyzed that may appear in relay protection of 110 kV power system with variable impedancetransformer. In order to improve the sensitivity of the relay protection, the new method of self -adapting protection was proposed. The feasibility analysis was made for the excitation inrush currentidentification method of the variable impedance transformer without commission. It '' s concludedaccording to the simulation results that the traditional relay protection method can still adapt to 110 kVpower system with variable impedance transformer, and the self-adapting protection method can real- ly upgrade the sensitivity of the relay protection.