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Reconstruction Method of Coil Current Curve of Circuit Breaker Operating Mechanism Based on Feature Points

A technology of operating mechanism and coil current, which is applied in the direction of circuit breaker testing, etc., can solve the problems that users cannot obtain electronic data files of opening and closing coil current curves, limit the analysis of the operating state of circuit breaker operating mechanisms, and have different original data formats, etc.

Active Publication Date: 2017-12-01
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since each manufacturer uses different circuit breaker monitoring systems when performing performance tests on circuit breaker operating mechanisms, the original data formats obtained may also be different. Some manufacturers only provide test reports with several key feature points to users. , the user cannot obtain the electronic data file of the opening and closing coil current curve of the entire circuit breaker operating mechanism, so the current technology limits the further analysis of the operating state of the circuit breaker operating mechanism, so the reconstruction of the coil current waveform is in some cases is very necessary

Method used

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  • Reconstruction Method of Coil Current Curve of Circuit Breaker Operating Mechanism Based on Feature Points
  • Reconstruction Method of Coil Current Curve of Circuit Breaker Operating Mechanism Based on Feature Points

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Embodiment 1

[0028] A method for reconstructing a coil current curve of a circuit breaker operating mechanism based on feature points, the method comprising the following steps:

[0029] (1) The waveform curve of the opening and closing coil current of the operating mechanism is obtained according to the test equipment of the operating mechanism of the circuit breaker. By analyzing the current waveform change of the opening and closing coil of the operating mechanism of the circuit breaker, the waveform curve has 6 inflection points. It is divided into 5 change stages, and the 6 inflection point data are extracted from the curve as the characteristic point data of the curve, that is, the coil current parameter { I 0 ，I 1 ，I 2 ，I 3 ，I 4 ，I 5} and the corresponding time parameter { t 0 ，t 1 ，t 2 ，t 3 ，t 4 ，t 5};

[0030] (2) Reconstruction of the current curve of the opening and closing coil of the circuit breaker operating mechanism:

[0031] By analyzing the current w...

Embodiment 2

[0039] According to the characteristic point-based method for reconstructing the current curve of the opening and closing coil of the circuit breaker operating mechanism according to claim 1, it is characterized in that: the curve reconstruction of the stage 1 is in the time period t0~t1, and the circuit breaker operating mechanism The opening and closing coils are in t 0 When the current is energized at all times, there is current passing through the coil. Since the current is not large enough at this time, the generated magnetic flux is not large enough, and the electromagnetic force generated by the electromagnet does not reach the operating value of the iron core. Therefore, the electromagnetic coil is energized at this stage, but the iron core does not The coil inductance is constant, and the coil current rises exponentially. The time of stage 1 is related to the control power supply voltage and coil resistance parameters, and its differential equation is approximately an...

Embodiment 3

[0041] According to the method for reconstructing the coil current curve of the circuit breaker operating mechanism based on the characteristic points described in Embodiment 1, the curve reconstruction in the phase 2 is during the time period t1~t2, t 1 At any time, the coil current increases to the point where the generated electromagnetic force can overcome the resistance of the iron core itself, such as gravity, motion friction and spring reaction force, and drive the iron core to move. With the movement of the iron core, the air gap of the magnetic circuit decreases continuously, and the magnetic circuit The magnetic resistance decreases and the coil reactance increases, so that the coil current decreases exponentially, and its differential equation approximates a quadratic function curve.

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Abstract

Reconstruction method of coil current curve of circuit breaker operating mechanism based on feature points. The circuit breaker is an important primary equipment in the power system. The reliability of the circuit breaker performance directly affects the reliability of the power system operation, and the mechanical failure of the circuit breaker operating mechanism is the main type of failure. Therefore, it is very important to diagnose the mechanical failure of the circuit breaker operating mechanism of. The method of the present invention includes: (1) monitoring and obtaining the original data of the opening and closing coil current under the normal operation of the operating mechanism of the circuit breaker and various possible faults, and extracting 6 characteristic points of the original data, that is, the coil current parameters {I0, I1, I2, I3, I4, I5} and corresponding time parameters {t0, t1, t2, t3, t4, t5}; (2) Reconstruction of the coil current curve of the circuit breaker operating mechanism. The invention is used for reconstructing the current curve of the opening and closing coil of the operating mechanism of the circuit breaker.

Description

Technical field: [0001] The invention relates to a method for reconstructing a coil current curve of a circuit breaker operating mechanism based on feature points. Background technique: [0002] The circuit breaker is an important primary equipment in the power system. The reliability of the circuit breaker performance directly affects the reliability of the power system operation, and the reliability of the circuit breaker mainly depends on the reliability of its operating mechanism, and the mechanical failure of the circuit breaker operating mechanism is the main Therefore, it is very important to diagnose the mechanical failure of the circuit breaker operating mechanism. The diagnosis of mechanical failure of the circuit breaker operating mechanism can be accomplished by measuring various mechanical parameters of the circuit breaker, among which the current signal of the opening and closing coil is one of the important monitoring parameters. The current waveform of the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
Inventor 景伟姜海洋阳薇郭志刚赵莉华荣强张浩付荣荣
Owner STATE GRID CORP OF CHINA
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