Molded case circuit breaker electromagnetic trip instantaneous calibration method

Abstract

The invention belongs to the technical field of electrical appliance detection, and relates to a molded case circuit breaker calibration method, and particularly relates to a molded case circuit breaker electromagnetic trip instantaneous calibration method. The molded case circuit breaker electromagnetic trip instantaneous calibration method is used for performing instantaneous calibration for a shipborne molded case circuit breaker, solves a problem that the accuracy is difficult to be ensured because the calibration time is short and an aperiodic component exists in calibration current when an electromagnetic trip instantaneous protection performance calibration is performed on the shipborne molded case circuit breaker. The molded case circuit breaker electromagnetic trip instantaneous calibration method comprises the steps of firstly setting calibration parameters, then acquiring rated current, then performing closed-loop adjustment by using a PID control method, acquiring an output waveform, acquiring a power factor, an impedance angle and the impedance in the circuit by using an FFT formula, and detecting a modulation ratio; and determining a closing phase of the circuit, performing coefficient modification, then performing open-loop calibration, outputting calibration current, and realizing instantaneous calibration for the shipborne molded case circuit breaker. The molded case circuit breaker electromagnetic trip instantaneous calibration method is reliable in principle, clear in technical flow, wide in application range and user-friendly in application environment.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of electric appliance detection, and relates to a verification method of a molded case circuit breaker, in particular to a method for verifying the instantaneous action of electromagnetic tripping of a molded case circuit breaker, which is used for checking the instantaneous action of a molded case circuit breaker for ships. check. [0003] Background technique: [0004] Molded case circuit breakers are widely used in low-voltage power distribution systems, generally used for distribution feeder control and protection, low-voltage side outgoing main switch of small distribution transformers, power distribution terminal control and protection, and residential power distribution terminals. Control and protection, also can be used for power switch of various production machinery. Small-capacity molded case circuit breakers below 50A adopt non-energy-storage closing and manual operation; the operating me...

AI Technical Summary

Problems solved by technology

After the thermal release and the electromagnetic release work for a period of time, there will be a deviation between the operating value and the setting value, which will cause the release to malfunction or not operate, and cannot guarantee the safe operation of the ship's power system and electrical equipment. Therefore, it is necessary to Verify its main performance indicators

[0005] At present, the naval fleet lacks corresponding reliable calibration devices and calibration methods, and the domestic related technical equipment has the following problems: 1. The calibration device cannot perform thermal trip delay protection characteristic verification and electromagnetic trip instantaneous protection characteristic verification at the same time. 2. The large current generating device adopts a multi-magnetic circuit voltage regulation and transformation system, which is bulky and slow in adjustment speed, and it is difficult to realize automatic control; 3. When verifying the instantaneous protection characteristics of electromagnetic tripping, the verification current exists Non-periodic components, difficult to guarantee accuracy

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