Abstract
With the continuous expansion of power system capacity, parallel high-voltage circuit breakers with a Highly Coupled Split Reactor (HCSR) have a potential application for limitation of high short-circuit current. However, as the parallel circuit breakers open at different time, the residual voltage of the split reactor on the post-open circuit breaker is higher and the stray capacitors of HCSR form high-order oscillating circuits, which may lead to serious transient recovery voltage (TRV). Therefore, it is necessary to analyze and simulate the transient characteristics of 500kV HCSR. Firstly, the equivalent model of HCSR circuit breakers is built in EMTP simulation plat-form, and its TRV generation is analyzed. Then, the TRV of parallel circuit breakers under different operating conditions and fault types is simulated and calculated. Finally, according to the statistical calculation results, the protection measure of 0.2uF shunt capacitance to limit rise rate of TRV is proposed.
Highlights
With the fast development of grid, the short-circuit currents of many central nodes of power grids are approaching or even exceeding the regulation standard seriously, endangering security and stability problems of power grid [1]
As the parallel circuit breakers open at different time, the residual voltage of the split reactor on the post-open circuit breaker is higher and the stray capacitors of Highly Coupled Split Reactor (HCSR) form high-order oscillating circuits, which may lead to serious transient recovery voltage (TRV)
The purpose of this paper is to study the electromagnetic transient of 500 kV shunt circuit breaker based on HCSR
Summary
With the fast development of grid, the short-circuit currents of many central nodes of power grids are approaching or even exceeding the regulation standard seriously, endangering security and stability problems of power grid [1]. In addition to superconducting fault current limiter, current limiting reactor, high voltage fuse, thyristor-based fault current limiter and bus splitting operation [2,3,4,5], the parallel technology of circuit breaker is one of the ways to solve high current interruption [6],[7]. Compared with other current limiting methods, the current limiter based on Highly Coupled Split Reactor (HCSR) has the advantages of simple principle, low cost and small space occupation. The coupled series reactance has lower energy consumption, and the working conditions are lower [8]. The control signal of the power electronic component is not needed, which improves the accuracy and economy of its action
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