Intelligent circuit breaker for shunt capacitor bank switching based on flexible opening and closing technology

Abstract

An intelligent circuit breaker for shunt capacitor bank switching based on a flexible opening and closing technology, comprising three poles A, B and C and an intelligent controller D. Three-phase power supplies UA, UB and UC are respectively connected with the three poles A, B and C; two ends of a shunt capacitor C1 are respectively connected with the poles A and B; two ends of a shunt capacitor C2 are respectively connected with the poles B and C; two ends of a shunt capacitor C3 are respectively connected with the poles A and C; each of the three poles A, B and C comprises a conductive and arc-extinguishing component (1), a first stroke sensing component (2), a closing damping component (3), a high-voltage insulated component (4), an opening and closing driving component (5), an opening damping component (6), and a second stroke sensing component (7) sequentially connected in series in an axial direction. The intelligent circuit breaker for shunt capacitor bank switching based on the flexible opening and closing technology features a simple structure, reliable operation, convenient maintenance, and a high price-performance ratio; a shunt capacitor bank can be switched frequently; the reactive power compensation equipment for shunt capacitor bank switching achieves effects of reducing loss and saving energy of a power grid, and improving the transmission capacity and electric energy quality of the power grid.

Description

technical field [0001] The invention relates to an intelligent circuit breaker, in particular to an intelligent circuit breaker for switching parallel capacitor banks based on flexible opening and closing technology. Background technique [0002] According to the change of reactive power of the grid, the input and removal of shunt capacitor banks from the grid are important technical measures and equipment for saving energy and reducing consumption, increasing grid output and improving grid power quality. The high-voltage circuit breaker (or high-voltage contactor) is used for the switching switch of the high-voltage shunt capacitor bank in the power grid. In recent years, due to the rapid development of intelligent electrical switch technology, high-voltage circuit breakers have developed in the direction of intelligence. The combination of primary switches, current transformers, voltage transformers and secondary automation equipment has become an intelligent circuit break...

AI Technical Summary

Problems solved by technology

[0003] The main disadvantage of the existing high-voltage circuit breaker or intelligent circuit breaker switching parallel capacitor bank is that the opening and closing process is not "flexible", that is, the movement of the moving contact is uncontrollable when opening and closing, so that the moving contact The timing of the closing or opening of the static contact is random, and it will bounce and bounce, so that the switching parallel capacitor bank will generate a large closing inrush current and opening overvoltage, which will have a negative impact on the power grid, parallel capacitor bank and the switch itself. A large damaging impact, and at the same time, the parallel capacitor bank cannot be switched frequently, which affects the social and economic benefits of the reactive power compensation equipment for switching the parallel capacitor bank

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