High-voltage circuit-breaker condition monitoring method of distribution automation system

A high-voltage circuit breaker and power distribution automation technology, applied in circuit breaker testing, instrumentation, measuring electricity, etc., can solve problems such as affecting the representation of the circuit breaker's operating state, and not recording the time when the substation circuit breaker outputs a trip command.

Inactive Publication Date: 2019-09-20
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Application Information

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Problems solved by technology

For example, CN100383547C's "High Voltage Circuit Breaker State Monitoring Method", which discloses that the state monitoring of the circuit breaker of the substation automation system is based on the breaking time and normal breaking time of the high voltage circuit breaker opening operation recorded by the fault recording device of the substation However, the breaking time of the opening operation recorded in this document is obtained based on the current decay process data during the opening operation of the high-voltage circuit breaker. Since the fault recording device of the substation records the entire substation The voltage of each busbar and the current of each line do not record the time when the substation circuit breaker outputs the trip command, so that the obtained breaking time of the substation circuit breaker opening operation is not an accurate value, but an estimated value, which seriously affects Characterization of circuit breaker operating status

Method used

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  • High-voltage circuit-breaker condition monitoring method of distribution automation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1 High-voltage circuit breaker closing judgment

[0053] The fault recording device at the terminal of the distribution automation system records the dynamic process of closing single-phase current at a rate of 6400HZ sampling frequency, that is, 128 sampling points per cycle and a sampling point interval of 0.15625 milliseconds. Using the full-wave Fourier algorithm according to the instantaneous value of the current at the 1-128 sampling time (ie the absolute value of the current sampling value)i k Calculate the effective value of the current at the 1-128th sampling time, and deduce the current effective value x corresponding to the k-th sampling point accordingly k The calculation of is shown in formula 1:

[0054]

[0055] In the above formula (1):

[0056]

[0057] Therefore, according to formula 1, the effective value of the subsequent cycle current corresponding to each sampling time can be calculated, and then the mean square deviation and a...

Embodiment 2

[0058] Embodiment 2 Determination of opening of high voltage circuit breaker

[0059] The fault recording system of the distribution automation terminal uses a sampling frequency of 6400HZ, that is, 128 sampling points per cycle, and the sampling point interval is 0.15625 milliseconds to record the dynamic process of the single-phase current of the opening. Using the full-wave Fourier algorithm according to the instantaneous value of the current (that is, the absolute value of the current sampling value) at the sampling time of 1 to 128 i k Calculate the current RMS value at the 128th sampling moment; derive the current RMS value x corresponding to k sampling points in this way k The calculation of is shown in the following formula (1):

[0060]

[0061] In the above formula (1):

[0062]

[0063] Therefore, according to the formula (1), the effective value of the previous cycle current corresponding to each sampling time can be calculated, and its judgment and analy...

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Abstract

The invention discloses a high-voltage circuit-breaker condition monitoring method of a distribution automation system. Through the opening / closing command issuing moment recorded by a terminal device of a power distribution station automation system and a load current change process during the opening / closing operation of a high voltage circuit breaker, the load current dynamic data during the opening / closing of the high voltage circuit breaker can be utilized to calculate the opening / closing completion moment of the high voltage circuit breaker, so that the opening / closing time of the high voltage circuit breaker can be determined according to the recorded opening / closing command issuing moment and the opening / closing moment of the high voltage circuit breaker, and the state of the high voltage circuit breaker can be assessed according to whether the opening / closing time of the high voltage circuit breaker reaches the standard. The method can perform state monitoring of the terminal high voltage circuit breaker of the distribution automation system on the existing basis of the distribution automation system without increasing hardware equipment, so that the method is good in economy, and the operation reliability of the high voltage circuit breaker of the distribution automation system can be enhanced.

Description

technical field [0001] The invention relates to a method for monitoring the state of electric equipment, in particular to a method for monitoring the state of a high-voltage circuit breaker in a power distribution automation system. Background technique [0002] In order to improve the level of monitoring, protection and control of the distribution network, various domestic power supply companies have successively built distribution automation systems, laying an important foundation for timely and accurate grasp of distribution system operation and abnormal fault status information, arranging fault recovery and ensuring user power supply. technical foundation. The terminal equipment of distribution automation is located outdoors, the operating environment is harsh, and the terminal failure rate is high. In addition, the terminal equipment is scattered and distributed, it is difficult to accurately grasp the operating status of the terminal equipment, and it is difficult to g...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/3275
Inventor 苏盛洪亮曹一家赵奕秦卫东刘元汪干
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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