A fault current limiter test circuit and control method

Abstract

The invention discloses a testing circuit and a control method for a fault current limiter. The testing circuit comprises 3 parts of a charging loop, an oscillating loop, and a sample loop. The oscillating loop comprises oscillating a first oscillating capacitor and a second oscillating capacitor, an oscillating inductor, a main control switch, and a capacitance oscillating control switch. The sample loop is a fault current limiter. The control method comprises the following steps: placing the main control switch of the oscillating loop in a split position, and placing the fault current limiter in the sample loop in an unoperated state; the charging loop charging the first oscillating capacitor and the second oscillating capacitor; disconnecting the connection switch of the charging loop and the oscillating loop after charging is completed; switching on the main control switch of the oscillating loop; resonance between the oscillating capacitor and the oscillating inductance generatingtest currents to flow through the sample loop; the fault current limiter operates after the test current reaches the operation threshold value thereof, transferring the current to an internal current-limiting inductor, meanwhile turning on control switch for the capacitor oscillation, so that the first oscillating capacitor exits the oscillation; making the second oscillating capacitor, the oscillating inductor, and the internal current-limiting inductor of the sample loop in the oscillating loop start oscillating, wherein the testing frequency is guaranteed to be consistent.

Description

technical field [0001] The invention relates to the field of short-circuit fault current limiting in AC power systems, in particular to a fault current limiter test circuit and a control method. Background technique [0002] Among all kinds of power system accidents, short circuit is one of the most common serious faults that endanger the safe and stable operation of the power system and cause large-scale power outages. The severity of the short-circuit fault damage to the power system mainly depends on the magnitude of the short-circuit current. [0003] Macroscopically speaking, the effective limitation of short-circuit current can not only solve the problem of excessive short-circuit capacity of the power system, but also greatly reduce the design capacity standards for short-circuit current of various electrical equipment such as transformers and circuit breakers in the power grid, thereby bringing greater economic and social benefits. Therefore, the current limiting t...

AI Technical Summary

Problems solved by technology

At present, apart from installing the entire fault current limiter in the actual power system and testing the fault current limiter with artificial grounding short-circuit faults, there is no method for fully testing and evaluating the operation process of the complete fault current limiter in the laboratory.

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