Method and system for judging the cause of transformer protection trip based on power grid fault recording chart
A technology for transformer protection and power grid faults, applied in circuit breaker testing, measuring electrical variables, instruments, etc., can solve problems such as error-prone, time-consuming and labor-intensive, and achieve the effect of overcoming shortcomings and deficiencies
Active Publication Date: 2021-11-16
SHENZHEN POWER SUPPLY BUREAU
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Problems solved by technology
[0005] At present, there is no method for judging the cause of the tripping of the heavy gas relay connected to the transformer in the existing technology. Even if there is a method, a large amount of field data and data calculation and analysis are required to make a judgment, which is not only time-consuming and labor-intensive, but also prone to errors
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[0038]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0039] Such as figure 2 As shown, the inventors found that when the transformer is often connected between the high voltage side of the 220kV main transformer and the low voltage side of the 110kV main transformer and works normally, the current I at the high voltage side of the 220kV main transformer 1 Normal current I to the low-voltage side of the 110kV main transformer 2 The direction flows in, at this time the current I 1 The direction of the flow is from the polar end to the non-polar end, and the current I 2 The direction of flow is from the non-polar end to the polar end.
[0040] Such as image 3 As shown, if there is an electrical fault inside the above-mentioned transformer, a large amount of characteristic gas will be generated and the protection a...
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The invention provides a method for judging the cause of transformer protection tripping based on the power grid fault record diagram, which includes obtaining the transformer fault record diagram, on which are formed relay protection switch waveforms, heavy gas protection trip switch waveforms, and main transformer high-voltage side three. Phase current and voltage waveforms, three-phase current and voltage waveforms on the low-voltage side of the main transformer; if there is a sudden change in the waveform of the heavy gas protection trip switching value, it is determined that the heavy gas relay protection action trips; after the heavy gas relay protection action trips, respectively detect Whether there is a sudden change in the relay protection switching waveform, the three-phase current and voltage waveform on the high-voltage side of the main transformer, and the three-phase current and voltage waveform on the low-voltage side of the main transformer, and determine the reason for the tripping of the heavy gas relay protection action based on the detection results It is an electrical fault or a non-electrical fault. The invention is implemented to quickly find the reason for the tripping of the protection action of the heavy gas relay without mathematical calculation, simple and intuitive, and saves time and effort.
Description
technical field [0001] The invention relates to the technical field of relay protection, in particular to a method and system for judging the cause of a transformer protection trip based on a power grid fault recorder. Background technique [0002] Transformer is one of the important components of power plants and substations in the power grid system. It is responsible for the connection of power grids with different voltage levels (for example, connected between the high-voltage side of the 220kV main transformer and the low-voltage side of the 110kV main transformer). Important equipment for voltage level voltage contact. Therefore, in addition to the differential protection as the main protection for the transformer to prevent the failure of transformer bushings, outlets, current transformers, coils, iron cores and other components, the transformer is also equipped with heavy gas protection as the main protection. Among them, the working principle of heavy gas protection...
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IPC IPC(8): G01R31/327
CPCG01R31/3278
Inventor 王世祥谷斌吴海涛钱敏郭育才
Owner SHENZHEN POWER SUPPLY BUREAU