Combined Transformer: combined transformer is a combination of voltage transformers, current transformers transformers together. Combination of high-voltage transformer can be changed to a low voltage, high current change for low current high voltage transformer Zibo Which is good, which played for energy measurement purposes. The basic principle of zero sequence transformer zero sequence current protection is based on Kirchhoff's current law: any node in the circuit flows into the complex algebra and zero current. In line with the electrical equipment under normal circumstances, each phase current vector and zero Binzhou high voltage transformer Which is good, so the sunshine Which high voltage transformer, zero sequence current transformer secondary winding no signal output, actuator no action. When the vector of each phase ground fault current is not zero when the high voltage transformers, fault current to zero sequence current transformer toroidal magnetic flux generated in the secondary side of the induced voltage zero-sequence current transformer so that the actuator action, driven tripping device, switching power supply network, to ground fault protection purposes. Which Texas high voltage transformers, high voltage transformers, power is supplied by the Xi'an Huayi Huayi power plant. Xian Huayi power plant (www.xahy.com) strong, credible, in Xi'an high-voltage circuit breakers and other industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Huayi power and you hand into the brilliant, for a better future!