Patent
Measuring method for power distribution network ground capacity
Hongjiang Ma,Bo Chen,Zhanglei Liu,Xiangjun Zeng,Yao Xu,Yuanyuan Wang +5 more
- 06 Oct 2010
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TL;DR: In this paper, the authors proposed an earth capacity measuring method of distribution network, which includes following step steps: cascading one controlled reactor at opening trigonometry side of the distribution network voltage transformer, infusing one constant size frequency-changing electric current signal by controlled reactor, measuring return voltage; change signal frequency, search one resonant frequency of system; then change size of reactor, use same method to find out another resonant frequencies of system, then figure out earth capacity value of distribution system.
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Abstract: This invention relates to a earth capacity measuring method of distribution network. The invention includes following step steps: cascading one controlled reactor at opening trigonometry side of distribution network voltage transformer, infusing one constant size frequency-changing electric current signal from opening trigonometry side of voltage transformer by controlled reactor, measuring return voltage; change signal frequency, search one resonant frequency of system; Then change size of reactor, use same method to find out another resonant frequency of system, then figure out earth capacity value of distribution network. This method completely avoid impact of electrical leakage of switching station transformer, greatly advance measuring accuracy, possess security, immediacy and such on merit.
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Citations
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Test apparatus and method for measuring common-mode capacitance
Zhou Min,Yicong Xie,Jinping Zhou,Jian-Ping Ying +3 more
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TL;DR: In this paper, the authors present a test apparatus for measuring the common-mode parasitic capacitance between a first element and a second element being isolated from the first element, based on the signal response.
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- 31 May 2017
TL;DR: In this article, an improved signal injection method-based capacitive current measurement method of a power distribution network is proposed, in which constant-current signals with the same amplitude and different frequencies are injected from an open-delta terminal of a secondary side of a busbar voltage transformer.
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Detecting device and method used for ground capacitance of power distribution network
Xiao Guode,Shen Yangshuo,Wang Xin,Zhu Guang An,Wang Cong,Zhou Liang,Sun Biao,Zhang Jie,Xie Jingtian,Liu Hao,Huangfu Jian,Wu Fei +11 more
- 25 Mar 2015
TL;DR: In this article, the ground capacitance of a power distribution network is measured using a voltage transformer, an adjustable reactor, a capacitance measuring instrument, a frequency measurer, adjustable power source and a voltage detector.
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Li Qiong,Shi Zhentang,Meng Fanzhong,Qin Wenjie,Qian Zhihong,Li Jun +5 more
- 06 Jul 2016
TL;DR: In this paper, a power network ground capacitance current detection method is proposed, which consists of installing a current type three-phase four-leg inverter bridge on a threephase circuit, adjusting a service bridge leg to respectively inject detection current into A, B, C three phases to successively measure a neutral point offset voltage; utilizing a phase voltage, injected current and a neutral-point offset voltage phasor to calculate split-phase ground capacivities; and calculating splitphase ground-capacitance current according to the split phase ground capacities.
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