Discussion on GIS Same Frequency and Same Phase Withstand Voltage Test Scheme—Taking Zhengzhou Airport 110 kV Aviation Transformer as an Example
[Purposes]By studying and formulating a feasible withstand voltage test scheme,and on the premise of the normal operation of Zhengzhou Airport Phase Ⅱ(T2 Terminal,GTC,Information Center,Flight Area,etc.),this paper aims to ensure the timely completion of the North Cargo Area and Flight Area Supporting Works of Phase Ⅲ Expansion Project.[Methods]The entire process of the same fre-quency and same phase withstand voltage test plan for the 110 kV aviation substation GIS of Zhengzhou Airport can be divided into three stages:the first stage is to conduct AC withstand voltage test on the break of the isolation switch on the outgoing side of the 3#main transformer bay using the conventional series resonance withstand voltage method by the testing unit;in the second stage,the testing unit will conduct an AC withstand voltage test on the break of the 3#main transformer bay circuit breaker using the conventional series resonance withstand voltage method;in the third stage,the testing unit will con-duct an overall phase to ground and phase to phase AC withstand voltage test on the A,B,and C phases of the expanded 3#main transformer bay(from the lower end of the busbar to the cable compartment)us-ing the same frequency and phase to phase withstand voltage method.[Findings]The same frequency and same phase withstand voltage test has been carried out and successfully completed according to the established plan,creating the"double first case"of similar withstand voltage tests in the national civil aviation system and Henan power system,accumulating valuable experience for conducting non power outage tests after expansion or maintenance of high-voltage equipment of the same level.[Conclusions]Practice has shown that the test plan adopted in this same frequency and same phase withstand voltage test effectively avoids the adverse effects of conventional power outage withstand voltage test,such as complex operation and power outage losses,and can achieve the established test objectives under the live working condition of double busbars of GIS high-voltage equipment.
110 kv substationGIS high-voltage equipmentwithstand voltage testdouble busbar power outagesame frequency and same phase
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