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A method and system for detecting arc extinguishing performance of SF6 circuit breaker

A detection method and technology of circuit breakers, which are applied in circuit breaker testing, instrumentation, measuring electricity and other directions, can solve the problem that the arc extinguishing performance of multiple circuit breakers cannot be compared horizontally, the arc extinguishing performance cannot be compared vertically, and no SF6 circuit breaker is found to be extinguished. Arc capabilities, etc.

Active Publication Date: 2022-06-07
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the inventors found that the current detection of the arc extinguishing ability of the circuit breaker mainly depends on parameters such as opening time, opening speed, rated breaking current, maximum breaking current, and cumulative breaking current. These parameters often only consider one influencing factor
However, the arc extinguishing performance of a circuit breaker is affected by many factors. Using the above parameters, it is impossible to make a longitudinal comparison of the arc extinguishing performance of the same circuit breaker under the condition of breaking any current, and it is also impossible to compare the actual arc extinguishing performance of multiple circuit breakers. Arc extinguishing performance for horizontal comparison
In addition, for SF6 circuit breakers, the pressure of SF6 gas has a great influence on the arc extinguishing performance of the circuit breaker, but the influence of this parameter is not considered when testing the arc extinguishing ability of SF6 circuit breakers.
[0006] In summary, there is no relevant research on the detection of the arc extinguishing ability of SF6 circuit breakers from multi-dimensional and multi-parameter perspectives.

Method used

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  • A method and system for detecting arc extinguishing performance of SF6 circuit breaker
  • A method and system for detecting arc extinguishing performance of SF6 circuit breaker
  • A method and system for detecting arc extinguishing performance of SF6 circuit breaker

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Embodiment 1

[0030] In one or more embodiments, a method for detecting the arc extinguishing performance of an SF6 circuit breaker is disclosed, refer to figure 1 , including the following steps:

[0031] (1) Obtain the effective value of the current in the initial stage of opening of the circuit breaker to be tested;

[0032] Specifically, the effective value of the current in the initial stage of opening can be obtained by measuring the current transformer;

[0033] During the opening process of the circuit breaker, since the line current cannot change abruptly, plasma will be generated between the contacts to form an arc, which has a strong thermal effect. The rms value of the current at the initial stage of opening is closely related to the size of the arc during the opening process of the circuit breaker. Therefore, the RMS current at the initial stage of opening can be used to characterize the thermal effect of the arc during the opening process.

[0034] Under the same conditions ...

Embodiment 2

[0052] In one or more embodiments, an SF6 circuit breaker arc extinguishing performance detection system is disclosed, including:

[0053] A device for obtaining the effective value of the current in the initial stage of opening of the circuit breaker to be tested;

[0054] A device used to obtain the SF6 gas pressure change curve through the SF6 gas pressure sensor;

[0055] A device for obtaining parameters of the burning duration of the arc;

[0056] The device is used to calculate the detection index of the arc-extinguishing characteristics according to the obtained parameters and the relationship between each parameter and the arc-extinguishing characteristics of the SF6 circuit breaker, and then determine the arc-extinguishing characteristics of the circuit breaker to be tested.

[0057] The specific working manner of the above-mentioned apparatus is the same as the implementation process of the method in the first embodiment, and will not be repeated.

Embodiment 3

[0059] In one or more embodiments, a terminal device is disclosed, including a server, the server including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the During the program, the method for detecting the arc extinguishing performance of the SF6 circuit breaker in the first embodiment is implemented. For brevity, details are not repeated here.

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Abstract

The invention discloses a method and system for detecting arc extinguishing performance of a SF6 circuit breaker. , combined with the relationship between each parameter and the arc extinguishing characteristics of the SF6 circuit breaker, calculate the arc extinguishing characteristic detection index, and then determine the arc extinguishing characteristics of the circuit breaker to be tested. The invention comprehensively examines the current thermal effect, the mechanical characteristics of the circuit breaker and the SF6 gas pressure effect, and obtains the detection index by constructing a detection model; real-time detection of the arc extinguishing performance of the circuit breaker can make a longitudinal comparison of the actual arc extinguishing performance of the same circuit breaker, and also The arc extinguishing performance of multiple circuit breakers can be compared horizontally, and the arc extinguishing performance of SF6 circuit breakers can be detected in a multi-dimensional, convenient and effective manner.

Description

technical field [0001] The invention relates to the technical field of power equipment performance detection, in particular to a method and system for detecting the arc extinguishing performance of an SF6 circuit breaker. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] High-voltage circuit breakers are an important part of the power system and the most important control and protection equipment. The high-voltage circuit breaker is used to connect the circuit and disconnect the load during normal operation, to cut off the fault current in the event of an accident, and to perform reclosing when necessary. Its mechanical characteristics directly affect the safe and reliable operation of the power system. The mechanical characteristic parameters during the closing process of the circuit breaker mainly include the closing stroke, closing time,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
CPCG01R31/3271
Inventor 陈伟坤雷敏刘鹏吴寿山孙昭昌白志轩葛惠阳张倩
Owner STATE GRID SHANDONG ELECTRIC POWER
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