Molded case circuit breaker electromagnetic trip instantaneous calibration method

A technology of electromagnetic tripping and calibration method, applied in circuit breaker testing and other directions, can solve the problems of difficulty in ensuring accuracy, single function, large volume, etc., and achieve high waveform output accuracy, friendly application environment, and clear technical process. Effect

Inactive Publication Date: 2017-05-31
THE PLA NAVY SUBMARINE INST
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  • Summary
  • Abstract
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  • Claims
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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

Method used

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  • Molded case circuit breaker electromagnetic trip instantaneous calibration method
  • Molded case circuit breaker electromagnetic trip instantaneous calibration method
  • Molded case circuit breaker electromagnetic trip instantaneous calibration method

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Embodiment 1

[0027] The specific verification steps of the method for verifying the electromagnetic tripping moment of the molded case circuit breaker involved in this embodiment are as follows:

[0028] (1) When performing instantaneous calibration on a molded case circuit breaker with a frame level current of 400A, set the calibration current to 4800A and the time to 1s;

[0029] (2) Take one-third of the calibration current value of 1600A as the rated current, set the time parameter to 2.8s, and perform closed-loop PID adjustment. The industrial computer 7 will output voltage and current waveforms on the display screen after analysis and processing. size and phase;

[0030] (3) After the output current is stable, use the FFT formula to calculate the power factor and impedance angle in the loop according to the voltage, current and phase parameter values, then calculate the loop impedance, and detect and calculate the modulation ratio when the loop is stable;

[0031] RMS value of AC vo...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
CPCG01R31/327
Inventor 吴言凤孙俊忠周智勇蔡巍杨占录刘金辉王宗亮王阔厅刘吉军
Owner THE PLA NAVY SUBMARINE INST
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