Transient Recovery Voltage Distribution Ratio and Voltage Sharing Measure of Double- and Triple-Break Vacuum Circuit Breakers

• Published in: IEEE transactions on components, packaging, and manufacturing technology (2011) Vol. 6; no. 4; pp. 545 - 552
• Main Authors: Huang, Daochun, Shu, Shengwen, Ruan, Jiangjun
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01-04-2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Capacitance; Capacitors; Circuit breakers; Current measurement; Distribution ratio; double break; grading capacitor; Interrupters; postarc current (PAC); residual charge (RC); Transient analysis; transient recovery voltage (TRV); triple-break; vacuum circuit breaker (VCB); Voltage measurement; voltage sharing measure; Distribution ratio; voltage sharing measure; grading capacitor; residual charge (RC); transient recovery voltage (TRV); double break; postarc current (PAC); triple-break; vacuum circuit breaker (VCB)
• ISSN: 2156-3950; 2156-3985
• DOI: 10.1109/TCPMT.2016.2532339

Transient recovery voltage (TRV) distribution ratio and voltage sharing measure of series arrangement double- and triple-break vacuum circuit breakers (VCBs) were studied in this paper. The mathematical analysis of the TRV distribution ratio in a double-break VCB shows that the uneven TRV distribution ratio is caused by the stray capacitances and the imbalanced postarc current as a result of the difference of the postarc plasma characteristics in each vacuum interrupter. This has been proven by the synthetic breaking tests and simulation results based on a modified vacuum arc interruption model of a double-break VCB. On this basis, voltage sharing measure for a 126-kV triple-break VCB designed for the 110-kV power network has been discussed. The synthetic breaking test results indicated that the 126-kV triple-break VCB with 1000-pF grading capacitors has a substantially uniform TRV distribution, and can successfully break the rated short-circuit interrupting current (40 kA rms ).