State Grid Hubei Electric Power Research Institute

State Grid Corporation of China

China Railway Siyuan Survey and Design Group Co., Ltd.

Wuhan Power Supply Design Institute Co., Ltd.

State Grid Hubei Wuhan Electric Power Supply Company

Shenzhen Metro Construction Group Co., Ltd.

State Grid Hubei Electric Power Co., Ltd.

Wuhan Xindian Electric Co., Ltd.

Ling Ruan

Rui Liu

Jian Wang

Zeyang Tang

Zhichun Yang

Zhi Tian

Chao Cai

Xiaoxun Deng

Yong Yao

Ling Qiu

Wenpei Li

Shuang Chen

Zhou Ge

Lingxiao Gao

A method for analyzing a correlation between rail transit and direct current (DC) magnetic bias of a transformer includes the steps of, A: obtaining a current of a feed cable and a DC magnetic bias current: measuring the feed cable current in rail transit and the DC magnetic bias current of a transformer in a power grid within a certain period by a monitoring apparatus; B: calculating a characteristic quantity of the feed current within the measurement period based on the obtained current of the feed cable; C: calculating a characteristic quantity of the DC magnetic bias current within the measurement period based on the DC magnetic bias current; and D: calculating a support degree and a confidence coefficient based on the calculated characteristic quantity of the feed current and the calculated characteristic quantity of the DC magnetic bias current, and generating a correlation rule.

Method for analyzing correlation between rail transit and direct current (DC) magnetic bias of transformer

Provided are an insulation diagnosis and defect positioning method, apparatus and device for an insulated bus pipe, and a storage medium. The method includes: applying a test voltage between a ground electrode and a conductor portion of the insulated bus pipe; identifying multiple grounded segments of the insulated bus pipe according to a ground shielded short wiring and a line ground wiring, measuring a length of each grounded segment and a ground current of each grounded segment at the test voltage, and calculating a ground current per unit length of each grounded segment; comparing ground currents per unit length of different grounded segments; measuring a capacitance current value of each grounded segment according to a quantity, a length and a number of intermediate couplings included in each grounded segment; comparing the ground current and the capacitance current value of each grounded segment; according to the comparison results, diagnosing an insulation status and implementing defect positioning of the insulated bus pipe.

Insulation diagnosis and positioning method for insulated bus pipe

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Hubei, China

Ling Ruan