State Grid Corporation of China

State Grid Zhejiang Electric Power Co., Ltd. Taizhou Power Supply Company

Taizhou Power Supply Company of State Grid Zhejiang Electric Power

Taizhou Hongda Electric Power Construction Co., Ltd.

Xu Jiang

Kang Wang

Zhen Huang

Jian Wu

Chi Zhang

Guode Ying

Jun Liu

Tao Zhu

Jian Yang

Hua Xu

Yuande Zheng

Feng Guo

Hao Tan

Hao Li

Chen Zhou

Huan Liu

Jiandong Si

Ping Zhao

Zaibing Zhou

Ben Li

Xiaochun Xu

Qingchun Zhao

Xiaotong Zhu

Wenhui Li

Yiping Shen

Yutao Qiu

Guanglei Wan

Yiqin Tang

Chengshi Zeng

Zheng Qin

Bin Tang

Xin Lv

Jianguo Pan

Qiuxiao Wang

Junzhe Liang

Disclosed is a multi-dimensional analysis method for a tripping risk of a whole transmission line due to a lightning shielding failure. A quantity of thunderstorm days, a tower size, a terrain proportion, an altitude, and insulation configuration data are collected for a transmission line for which a tripping risk due to a lightning shielding failure needs to be analyzed, and a striking distance, an exposure distance, a lightning resisting level of the line after altitude factor correction, and a lightning shielding failure risk of a single-base tower are calculated in turn. Characteristics of a lightning shielding failure under different nominal heights, quantities of thunderstorm days, and terrains are studied. Representative combination conditions are selected to calculate a tripping risk of a typical tower due to the lightning shielding failure. A weight coefficient is extracted, to calculate a tripping risk of the whole line due to the lightning shielding failure.

Multi-dimensional analysis method for tripping risk of whole transmission line due to lightning shielding failure

Provided is a determination method of differential protection suitable for an electricity transmission line with multi-terminal T-connection. The determination method includes: sampling and calculating all phase currents, and calculating a maximum fault component current &#x394;&#x130;in phase current amplitudes of each phase current, a differential current Iin the each phase current, a resistive current Iin the each phase current and a vector sum &#x394;&#x130;of fault component currents except &#x394;&#x130;in the phase current amplitudes of the each phase current; and comparing the maximum fault component current &#x394;&#x130;in phase current amplitudes of each phase current and a threshold setting value I, determining a value of a resistive coefficient K corresponding to the phase current amplitudes of the each phase current according to a comparison result, and performing differential determination on the differential current Iand the resistive current Iin phase current amplitudes of the each phase current according to a differential determination formula: if the differential current Iof the target phase satisfies the above differential determination formula, it is determined that a fault occurs in an area of the target phase.

Differential protection determination method

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Zhejiang, China

Xu Jiang