Field Experiments on 10 kV Switching Shunt Capacitor Banks Using Ordinary and Phase-Controlled Vacuum Circuit Breakers

Licheng Li,Qing Yang,Wenxia Sima,Ming Yang,Mi Zou

doi:10.3390/en9020088

Licheng Li, Qing Yang + Show 3 more

Open Access

https://doi.org/10.3390/en9020088

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Abstract

During the switching on/off of shunt capacitor banks in substations, vacuum circuit breakers (VCBs) are required to switch off or to switch on the capacitive current. Therefore, the VCBs have to be operated under a harsh condition to ensure the reliability of the equipment. This study presents a complete comparison study of ordinary and phase-controlled VCBs on switching 10 kV shunt capacitor banks. An analytical analysis for switching 10 kV shunt capacitor banks is presented on the basis of a reduced circuit with an ungrounded neutral. A phase selection strategy for VCBs to switch 10 kV shunt capacitor banks is proposed. Switching on current waveforms and switching off overvoltage waveforms with, and without, phase selection were measured and discussed by field experiments in a 110 kV substation in Chongqing, China. Results show that the operation of phase-controlled VCBs for 10 kV switching shunt capacitor banks is stable, and phase-controlled VCBs can be used to implement the 10 kV switching on/off shunt capacitor banks to limit the transient overvoltage and overcurrent. The values of overvoltage and inrush current using phase-controlled VCBs are all below those with ordinary VCBs.

Highlights

Switching shunt capacitor banks is the most widespread method for the compensation of reactive power or for the stabilization of voltage for power quality reasons [1,2,3,4,5,6]
Ungrounded system, we proposed that the vacuum circuit breakers (VCBs) with phase selection was a potential and alternative ungrounded system, we proposed that the VCBs with phase selection was a potential and alternative methodmethod to limittothe overvoltage and overcurrent caused by switching shunt capacitor banks
Group presented series offailures studies on the development and application studies on A3-07 the overvoltage and ainsulation caused by switching shunt capacitor banks haveof VCBs with phase

Summary

Introduction

Switching shunt capacitor banks is the most widespread method for the compensation of reactive power or for the stabilization of voltage for power quality reasons [1,2,3,4,5,6]. Group presented series offailures studies on the development and application studies on A3-07 the overvoltage and ainsulation caused by switching shunt capacitor banks haveof VCBs with phase [17,24]. Only a few studies have been done on the comparison and application of ordinary and phase-controlled VCBs in substation by field tests For this reason, field measurements of switching 10 kV shunt capacitor banks have been conducted with the use of both ordinary VCBs and phase-controlled VCBs to compare the opening overvoltage and closing current caused by 10 kV switching shunt capacitor banks. 2. Analytical Analysis the switching shunt capacitor bank circuit for an ungrounded power system with Y-connected.

ClosingAccording

Opening Operation

Phase-Selecting Control Strategy for 10 kV Ungrounded Capacitor Banks

50 Hz to voltage

Site layout inaa110

Switching oncapacity

Case 1

Case 2

Case 3

Findings

12. Waveforms

Conclusions