On-Line Monitoring of Shunt Capacitor Bank Based on Relay Protection Device

Yifeng Lin (), Jingfu Gan and Zengping Wang
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Yifeng Lin: School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
Jingfu Gan: State Grid Tangshan Power Supply Company, Tangshan 063000, China
Zengping Wang: School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China

Energies, 2023, vol. 16, issue 4, 1-13

Abstract: In modern power systems, the installation of a shunt capacitor bank is one of the cheapest and most widely used methods for improving the voltage profile. One shunt capacitor bank is composed of mass capacitor units and have ground, ungrounded, delta, wye connections that make configuration of capacitor banks is various. In the case of long-term operation, the failure of a single capacitor unit of a capacitor bank is likely to cause uneven voltage, which will lead to the breakdown and burning of the whole group, resulting in huge losses. The relay protection device can detect the simultaneous voltage and current of the capacitor. By utilizing these data from the relay, the abnormal state of the shunt capacitor banks at the initial stage of the fault can be found through monitoring the slight change in capacitance. Timely and early maintenance and repair would avoid capacitor bank faults and potentially greater economic losses. Capacitor banks have different connection modes. For ungrounded wye-connected capacitor banks with an unknown neutral point voltage, the capacitance parameters of each branch cannot be calculated. A parameter symmetry based on the calculation method for capacitor parameters is proposed. For long-term monitoring and observation of the capacitor capacitance value, the fault state and abnormal state of the capacitor are identified based on statistical methods. The simulation established by PSCAD verified that a relay protection device can realized an effective monitoring of the early abnormal state of the capacitor bank.

Keywords: shunt capacitor fault; equivalent balance equation; capacitance value calculation; capacitor monitoring (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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