Research On Relay Protection Test System For 500kV Double Circuit Placed At Same Tower

Double circuit placed at same tower is extensively applied on the engineering, along with increasing demand of the electric power. But circuit placed at same tower to manifold and transmit electricity corridor to narrow made the possibility of the breakdown also augment. For operation reliability and safety of the power grid, relay protection is tested before it is put into operation in actual power grid.Because relay protection test system is restricted with many factors in the prototype, and it is very difficult that the digital simulation accurately reappear the dynamic behavior of the actual system, but the perfectly model of relay protection test system can be established in the laboratory of dynamic simulation., so the following research work is studied about the model of 500kV double circuit placed at same tower protection test system in this article:Firstly, for actual simulating prototype, the article put forward simulation method and deduces relay protection test principle on the basis of research and analysis the power system of relay protection test system and the power system of the each component need follow the principle in the simulation.Secondly, the new method is adopted in the article, namely the secondly side of zero sequence current transformers switch in the resistance and the reactance simulate mutual inductance of circuit placed at same tower, and the modeling of process is depicted about the physical model of circuit placed at same tower.Finally, the model of 500kV of double circuit placed at same tower protects test system is established in the article, this article utilization the digital simulation and physical experiment two method analyze and validate circuit placed at same tower protection test system usefulness and possibilities.