The AC 35 kV ring network switchgear of urban rail transit adopts two segments of busbars for simultaneous power supply, and a busbar coupler switch, potential transformer, and protection device are set between the first and the second segment of busbars. The paper studies the anti-boost method for inspecting the secondary circuit of potential transformers. A measurement voltage is applied to the secondary side of the potential transformer on one segment of the busbar to obtain the measurement parameters of all protective devices and potential transformers on the primary side of the other segment of busbar that is not exerted with voltage. With the results of the measurement parameters, the normalcy of the wiring of the secondary circuit is judged to be normal or not. The method is able to avoid the inspection blind spots with adopting of traditional pointer methods and improve inspection efficiency.
关键词
二次回路/检测方法/电压互感器/平衡电压
Key words
secondary circuit/inspection method/potential transformer/balanced voltage
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