Under Special Conditions, Current Transformers And Electronic Transformers Pilot Study

In recent years, the generator sets, transformer capacities enhance unceasingly, the transmission line voltage grade is higher and higher. Current transformer in electric system has also changed at the same time. For example, primary current has reached 10000A and 30000A; Application of Gas Insulated Switcher(GIS) is gradually broader. Current transformers can satisfy transient error demands (TPS,TPY,TPX,TPZ etc.) are use extensively for 500kV power system. But, tradition current transformers experiment method can not satisfy the request under a lot of condition already, in order to guarantee the function for current transformers, ensures that power system safe, stabilizes, we must study testing methods to satisfy the request.This paper according to the experience of many years, has adopt a series of convenient and rapid, effective measurement means, advanced technology, theory to deduce, has provided one complete, reliable testing scheme, analize it from measuring principle , and carries out comparative analysis by large amount of experimental data, correctness and validity have be verified. The below-mentioned research has been carried out for current transformers characteristic and application fields:Experiment method of using tank and grounding electrode as primary conductor to measure circuit breaker current transformer.Experiment method of using outer covering and the earth switch as primary conductor to measure GIS current transformer.Adopt indirect and tradition experiment method to test current transformer, carries out comparative analysis by large amount of experimental data.Experiment method of adopting low frequency and frequency change technology to measure protective current transformer.Study experiment method of protective TP current transformer transient performance.Adopt these method to test current transformer on field in many power plants and substations of Test of Yunnan Province, these current transformers have contained many home and abroad products of famous electric accessory firm completely. These method resolve technology difficult problem that can not carry out experiment of excitation speciality transient performance on field, have provided one reliable , pragmatic , convenient and rapid current transformer experiment scheme on field, have lightened an intensity of labour, have improved the testing efficiency and decrease experimentation cost. These experiment methods can use for current transformer design , fabrication and substation test, check and accept, run , examine and repair, ensure produce mass of current transformer and power system safety , stability working. Power construction tests and electrical system examines and repairs especially, these experiment method are able to be applied broadly...