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《Relay》 2007-15
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Simulation of current transformer based on gauge solution

YU Guo-bin (Sinopec Zhenhai Refining & Chemical Company, Ninbo 315207, China)  
The saturation of CT has great influence on the performance of the protection.To ensure the relaying protections operating correctly under transient saturation circumstance,it is necessary to make deep research on the saturation characteristics of CT and analyze the saturated current shape.By selecting a mathematical function of fitting cocurrent magnetization curve and using gauge solution, the paper establishes a simulation model of current transformer. Based on the model, the paper makes the comparison on transformer characteristics of current transformer with different load, residual flux and hysteresis, analyzes hazards to relay protection with these transformer characteristics. Gauge solution method the paper proposed is an easy way to solute ferromagnetic non-linearity circuit simulation.
【CateGory Index】: TM452
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