Numerical analysis on electric field of three phase outdoor vacuum circuit breaker

2002 ◽  
Author(s):  
Cao Yundong ◽  
Liu Xiaoming ◽  
Wang Erzhi ◽  
Wang Licheng
Keyword(s):  
Numerical Analysis ◽  
Electric Field ◽  
Circuit Breaker ◽  
Vacuum Circuit Breaker ◽  
Three Phase

Three-phase modeling of 40.5-kV vacuum circuit breaker switching off shunt reactors and overvoltage suppression measure analysis

2021 ◽  
Vol 194 ◽  
pp. 107058
Author(s):  
Yun Geng ◽  
Jinlong Dong ◽  
Xinggui Chen ◽  
Luyang Zhang ◽  
Jing Yan ◽  
...  
Keyword(s):  
Circuit Breaker ◽  
Vacuum Circuit Breaker ◽  
Three Phase ◽  
Measure Analysis ◽  
Shunt Reactors

scholarly journals Static Voltage Sharing Design of a Sextuple-Break 363 kV Vacuum Circuit Breaker

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2512 ◽  
Author(s):  
Xiao Yu ◽  
Fan Yang ◽  
Xing Li ◽  
Shaogui Ai ◽  
Yongning Huang ◽  
...  
Keyword(s):  
Electric Field ◽  
Circuit Simulation ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Normal Operation ◽  
Parallel Structure ◽  
Voltage Distribution ◽  
Fem Model ◽  
Vacuum Circuit Breaker ◽  
A Minor

A balanced voltage distribution for each break is required for normal operation of a multi-break vacuum circuit breaker (VCB) This paper presented a novel 363 kV/5000 A/63 kA sextuple-break VCB with a series-parallel structure. To determine the static voltage distribution of each break, a 3D finite element method (FEM) model was established to calculate the voltage distribution and the electric field of each break at the fully open state. Our results showed that the applied voltage was unevenly distributed at each break, and that the first break shared the most voltage, about 86.3%. The maximum electric field of the first break was 18.9 kV/mm, which contributed to the reduction of the breaking capacity. The distributed and stray capacitance parameters of the proposed structure were calculated based on the FEM model. According to the distributed capacitance parameters, the equivalent circuit simulation model of the static voltage distribution of this 363 kV VCB was established in PSCAD. Subsequently, the influence of the grading capacitor on the voltage distribution of each break was investigated, and the best value of the grading capacitors for the 363 kV sextuple-break VCB was confirmed to be 10 nF. Finally, the breaking tests of a single-phase unit was conducted both in a minor loop and a major loop. The 363 kV VCB prototype broke both the 63 kA and the 80 kA short circuit currents successfully, which confirmed the validity of the voltage sharing design.

Restrike Modeling of Vacuum Circuit Breaker Switching Off Shunt Capacitor Banks with EMTP

2011 ◽  
Vol 383-390 ◽  
pp. 2287-2292
Author(s):  
Yong Yuan Wang ◽  
Sheng Hui Liu ◽  
Wen Ze Liu ◽  
Ke Ying Wang
Keyword(s):  
Circuit Breaker ◽  
Circuit Breakers ◽  
Vacuum Circuit Breaker ◽  
Three Phase ◽  
Two Phases ◽  
Shunt Capacitors ◽  
Recovery Voltage ◽  
Shunt Capacitor ◽  
Variation Trends ◽  
Theoretical Results

The shunt power capacitors are used as a reactive compensator while vacuum circuit breakers are used to switch shunt capacitors in power grid. To research the high over-voltage during switching off the shunt capacitors and a vacuum circuit beaker restriked, the restriking model is built with three-phase vacuum circuit breakers, considering the capacitors’ energy storage characteristic and asynchronous operating. The over-voltage is harmful to the insulation and life-circle of the equipments and even threatens power system safe and stabile operation. The variation trends of both recovery voltage between the contacts and the capacitors voltage are theoretically deduced. The model based on a 220kV substation of Guangdong grid was built and the most serious case that breakers are restriked in two phases are numbered with EMTP. Compared with theoretical results, simulation results are valid and practical.

Sign in / Sign up

Export Citation Format

Share Document