A bus tie protection method with outgoing line reactor

Abstract

The embodiment of the present invention discloses a bus tie protection method with an outgoing line reactor. By setting low-voltage blocking and quick-break protection on the bus tie and section circuit breakers, it can be used in the section protection of the bus tie section with an outgoing line reactor. Realize the distinction between internal and external faults of the bus, and combine with conventional current protection to realize the rapidity of bus tie protection, which can quickly remove faults, thereby reducing the scope of fault influence. The bus-tie protection method with outgoing line reactor of the present invention includes: setting a bus-tie circuit breaker and / or a section circuit breaker on the system, and setting a low-voltage lockout on the bus-tie circuit breaker and / or the section circuit breaker Quick break protection and current protection; obtain the current value of the bus tie circuit breaker and the voltage value of the bus where the bus tie circuit breaker is located; compare the current value with the bus tie current setting value, and the voltage value with the bus tie voltage setting value, Obtain a bus tie comparison result; enable bus tie protection according to the protection action logic of the bus tie circuit breaker and the bus tie 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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