Tongshan, China
Tongshan, China

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Jin W.,Xuzhou Runze Electrical Co. | Zhang D.,China University of Mining and Technology | Zhang Y.,Xuzhou Runze Electrical Co. | Li X.,China University of Mining and Technology
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

It is important to measure the capacitance to ground accurately for arc-suppression coil's automatic control. The principle area of impedance triangle based on impedance angle difference is proposed to calculate the system capacitance to ground aimed at coil series resistance grounding system. Triangle is constructed based on impedance angle difference by changing the value of inductance or resistance of arc-suppression coil, measuring the magnitude and phase of zero-sequence current before and after arc-suppression coil regulation. Unbalanced voltage is solved to calculate ground parameters. Matlab simulation results show that the method is easy to adjust and simple to calculate. This method meets the requirements of online measurement. ©, 2015, Power System Protection and Control Press. All right reserved.


Jin W.,Xuzhou Runze Electrical Co. | Yuan P.,Xuzhou Runze Electrical Co. | Zhang Y.,Xuzhou Runze Electrical Co. | Li X.,China University of Mining and Technology
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

A method of measuring capacitive current is proposed based on simultaneously adjusting the arc-suppression coil inductance and damping resistor to keep the system zero-sequence voltage phase unchanged. To limit neutral displacement voltage in arc-suppression coil grounding system, the parallel resistance is often adopted to improve the damping rate of system. The zero-sequence voltage phase keeps unchanged by increasing or decreasing the arc suppression coil damping and adjusting arc-suppression coil inductance, capacitive current of system can be calculated by amplitude ratio between the zero-sequence voltage. It is simple and convenient to measure by the method. Simulation model is simulated by Matlab, which shows that the method has high measuring accuracy. ©, 2015, Power System Protection and Control Press. All right reserved.

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