Generator outlet high-voltage side current limiting system

Abstract

The invention relates to a generator outlet high-voltage side current limiting system, which comprises a depth electric reactor, wherein the depth electric reactor comprises a measurement and control unit, a Rogowski coil and a controller, the a Rogowski coil and the controller are all installed on a bus, a high-speed digital potentiometer is arranged in the Rogowski coil, a high-speed switch is arranged inside the controller, a signal output end of the high-speed digital potentiometer is connected with a signal input end of the high-speed switch, a voltage output end of the bus is connected with a voltage input end of the measurement and control unit, one end (close to the Rogowski coil) of the bus is connected with a generator outlet high-voltage side and then connected with a transformer, and one end (close to the high-speed switch) of the bus is connected with a load. The generator outlet high-voltage side current limiting system can predict the accurate time of zero crossing points of three-phase currents rapidly and precisely, can be accurately switched off when the current approaches each zero crossing point by means of the high-speed switch, a short-circuit current is commutated to enter a depth current-limiting electric reactor, thus the short-circuit current is limited, and the generator outlet high-voltage side current limiting system can protect generators and transformers effectively and rapidly.

Description

【Technical Field】 [0001] The invention relates to a current limiting device, in particular to a current limiting system on the high-voltage side of a generator outlet. 【Background technique】 [0002] As we all know, when a short-circuit fault occurs in a power system, the short-circuit current is generally more than ten times the rated current, which causes great harm to electrical equipment such as transformers, generators, circuit breakers, and transmission lines. With the development of various types of power-consuming enterprises , The electrical load has risen sharply, and the capacity of the main transformer has also increased accordingly. The short-circuit current faced by the enterprise grid system has approached and reached the maximum use limit of the load vacuum circuit breaker, the breaking capacity of the load side vacuum circuit breaker is insufficient, and the transformer is resistant to short-circuit current impact Insufficient capacity design and other issues ser...

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Problems solved by technology

[0002] As we all know, when a short-circuit fault occurs in the power system, the short-circuit current is generally more than ten times the rated current, which causes great harm to electrical equipment such as transformers, generators, circuit breakers, and transmission lines. , the power load has risen sharply, and the capacity of the main transformer has also increased accordingly. The short-circuit current faced by the power grid system of various enterprises has approached and reached the maximum use limit of the load vacuum circuit breaker. The breaking capacity of the load-side vacuum circuit breaker is insufficient, and the transformer is resistant to short-circuit current impact Insufficient capacity design and other issues seriously threaten the safe operation of enterprises. Faced with today's problems, many enterprises use high-impedance transformers to limit the short-circuit current of the system, but increasing the impedance of the transformer does not finally solve the problem of current-limiting depth, and the electric power is reduced very little. It also brings active and reactive power loss, and the investment cost rises. Therefore, we propose a current limiting system on the high-voltage side of the generator outlet

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