Buscouple protection method with outgoing line reactor

Abstract

The embodiment of the invention discloses a buscouple protection method with an outgoing line reactor, and the method can achieve the separation of internal and external faults of a bus in buscouple segmented protection with the outgoing line reactor through setting a low-voltage locking quick break on a buscouple and a segmented circuit breaker, protects the quickness of buscouple protection through combining with conventional current protection, can quickly cut off a fault, and reduces the impact range of a fault. The method comprises the steps that a system is provided with a buscouple circuit breaker and/or the segmented circuit breaker; the buscouple circuit breaker and/or the segmented circuit breaker are/is arranged to have functions of low-voltage locking quick break and current protection; a current value of the buscouple circuit breaker and a voltage value of a bus where the buscouple circuit breaker is located are obtained; The current value is compared with a buscouple current set value and the voltage value is compared with a buscouple voltage set value, thereby obtaining a buscouple comparison result; and the buscouple protection is started according to a protection movement logic of the buscouple circuit breaker and the buscouple comparison result.

Description

technical field [0001] The embodiments of the present invention relate to the field of circuit protection, and in particular to a bus tie protection method with an outgoing line reactor. Background technique [0002] In power system protection, current protection is generally used. By detecting the current value flowing in the primary circuit, the serious condition of the fault in the circuit is analyzed, and targeted measures are taken according to the severity, and the fault is alarmed or removed in time to ensure the stability of the power system. [0003] For the main wiring structure of the power distribution device in the power system, the double-bus single-section wiring method is generally used. Generally, there are three-section busbars, equipped with bus couplers and section circuit breakers, and there are both generators and loads on the busbars. Distributing belongs to the generation-supply integrated bus, and the system capacity is relatively large. In order to ...

AI Technical Summary

Problems solved by technology

However, with this scheme, for the short circuit inside the bus itself, that is, the fault in the area, such as Figure 1 The short-circuit point in the zone belongs to the bus fault, and the bus coupler and section circuit breaker should be disconnected instantaneously to remove the faulty bus. After the system voltage drops to a very low level, it still needs to delay for a period of time before disconnecting the bus tie and section circuit breaker. Since the bus tie and section circuit breaker cannot be disconnected in time, the low voltage time of the bus bar is too long, which expands the impact of the fault and fails to effectively implement the relay protection of the power system The rapidity requirements in the middle, but also expand the scope of the accident

Therefore, for the quick-break protection of the bus coupler and the section circuit breaker under the main wiring mode with a large capacity of the double-bus single-section generation and supply system, the time delay for the short circuit inside the bus itself is relatively long. Causes the system voltage to drop too low, expands the fault impact area, and has obvious deficiencies in rapidity

[0005] The protection device in the existing technical scheme 2 needs to be connected to all power supply components (generators, transformers, bus tie circuit breakers, section circuit breakers, etc.) Many, the device wiring is complicated, there are many unsafe factors in the daily operation and regular debugging of the device, and the operation reliability of the device is low

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