Method for rapidly cutting off internal outlet fault of controllable high-voltage reactor for line protection

Abstract

The invention discloses a method for rapidly removing an internal outlet fault of a controllable high-voltage reactor for line protection. The method comprises the steps that: the current of a side circuit breaker, the current of an intermediate circuit breaker, the current of the head end of a controllable high-voltage reactor and the voltage of a line are collected in real time, and a differential current and a braking current are calculated; after protection is started, if split-phase current differential protection does not act but local side distance I section protection acts, whether there is an internal outlet fault in the controllable high-voltage reactor or not is judged according to a fault current, a fault voltage and the head end current of the controllable high-voltage reactor; and if it is judged that the internal outlet fault of the controllable high-voltage reactor occurs on the local side and the action time of the distance I section is less than a threshold, the differential current and the braking current do not compensate the head end current of the controllable high-voltage reactor on the local side any more, split-phase current differential protection quickly acts after meeting the condition, and circuit breakers on the two sides are tripped off. When the internal outlet of the controllable high-voltage reactor has a fault, if the distance section I acts, the split-phase current differential protection on the two sides quickly acts. The fault clearing time is less than 0.1 s, and the stability requirement of the system can be met.

Description

Technical field [0001] The present invention belongs to the technical field of power systems, and a method of rapid resection of a rapid resection of a controlled high anti-internal outlet failure. Background technique [0002] When the high voltage line is configured, the capacity to adjust the controllable reactor in the operation causes the differential current in the line protection to change, so the compensation capacitance current cannot be calculated again, and the phase-phase current difference protection is required. Controllable high-resistance current to achieve precise compensation of capacitive currents. [0003] The controllable reactor header and the tail end are equipped with CT (Current Transformer, current transformer), and its current can introduce line protection power supply differential components calculated. When using the first end CT, the protection range is the line full length and the reactor lead, and the protection range of the line CT is all the line...

AI Technical Summary

Problems solved by technology

After the high-resistance protection on this side is activated, the remote transmission function of the split-phase current differential protection needs to be activated to realize the remote tripping of the circuit breaker on the opposite side. For side circuit breakers, the duration of the entire fault exceeds 0.1s, and the fault removal time does not meet the safety and stability requirements of the power system

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