A zero-sequence CT polarity online detection method, system and equipment
A detection method and zero-sequence technology, which is applied in the field of circuit verification, can solve the problems of consuming a lot of manpower and material resources, untimely judgment, etc., and achieve the effect of ensuring safe and stable operation
Active Publication Date: 2022-04-19
GUANGDONG POWER GRID CORP ZHAOQING POWER SUPPLY BUREAU
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Problems solved by technology
[0004] The invention provides a zero-sequence CT polarity online detection method, system and equipment, which solves the problem that the existing zero-sequence CT polarity detection method must judge the zero-sequence CT polarity when a ground fault occurs, and the judgment is not timely and timely. Technical problems with defects that require a lot of manpower and material resources
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[0066] The embodiment of the present invention provides a zero-sequence CT polarity online detection method, system and equipment, which are used to solve the problem that the existing zero-sequence CT polarity detection method must distinguish the zero-sequence CT polarity when a ground fault occurs, and the existence judgment Technical problems of defects that are not timely and require a lot of manpower and material resources.
[0067] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the...
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The invention relates to the technical field of circuit calibration, and discloses a zero-sequence CT polarity online detection method, system and equipment. The present invention obtains sampling data based on the operating operation of the more common 10kV busbar switching capacitor bank, and uses the polarity of the zero-sequence voltage variation of the busbar as a benchmark, and compares it with the polarity of the zero-sequence current variation of each branch to be detected. To realize the polarity discrimination of each zero-sequence CT, the present invention does not need to use the zero-sequence current generated when the ground is short-circuited to discriminate the polarity of the zero-sequence CT, and can detect the polarity of the zero-sequence CT when the power grid is in normal operation, so Timely judging the reverse polarity error of the zero-sequence CT wiring is beneficial to the correct action of the zero-sequence protection when the power grid fails, ensuring the safe and stable operation of the power grid. The sampling data is collected on-site and can realize zero-sequence protection online. CT polarity detection does not need to arrive at the scene manually, saving a lot of manpower and material resources.
Description
technical field [0001] The invention relates to the technical field of circuit calibration, in particular to a zero-sequence CT polarity online detection method, system and equipment. Background technique [0002] In order to reduce the impact and loss on the safe and stable operation of the power grid after a ground fault occurs in the power grid, the power grid has zero-sequence protection configuration requirements, and the reliable operation of the zero-sequence protection depends on the polarity of the zero-sequence CT (current transformer). Is it closely related. There are a large number of feeder zero-sequence CTs on the 10kV side of the substation. If it is necessary to check one by one, it will take a lot of manpower and material resources, which is not conducive to finding hidden dangers. [0003] In the prior art, when performing zero-sequence CT polarity detection, usually in the state of substation power outage, the current booster or relay protection tester is...
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IPC IPC(8): G01R31/72G01R31/52
CPCG01R31/72G01R31/52
Inventor 李颖王维权张良梁柱坚张宏范肇龙苏永健唐龙江李俊华陈忠颖赵善飞梁远升陈浩泳
Owner GUANGDONG POWER GRID CORP ZHAOQING POWER SUPPLY BUREAU