Transformer differential protection method based on variable window length integral of abrupt change sampling value

A differential protection and transformer technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as adverse transformer impact, and achieve the effects of improving operating speed, easy implementation, and high computing efficiency.
CN109390912BActive Publication Date: 2020-02-11INTEGRATED ELECTRONICS SYST LAB
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
INTEGRATED ELECTRONICS SYST LAB
Publication Date
2020-02-11

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Abstract

The invention relates to a transformer differential protection method based on the variable window length integral of the sudden change sampling value. The current sampling value of each side is obtained through the current transformer on each side of the transformer, and the current of other sides of the transformer is attributed to the high voltage side, and the calculation is obtained. Differential current sampling value, differential current sudden change, use the differential current sudden change to judge whether the protection is started, calculate the differential current sudden change sampling value integration, judge whether the differential current sudden change sampling value integration meets the conditions, and carry out confirmation counting N 1 Accumulate, judge the accumulated N 1 Whether the conditions are met. The invention improves the operation speed of the differential protection, realizes the inverse time limit characteristic of the differential protection, reduces data cache and resource occupation, has high computing efficiency, and is easy to implement in the device.
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Description

technical field

[0001] The invention belongs to the technical field of automatic management of power transformers, and in particular relates to a transformer differential protection method based on variable window length integration of sudden change sampling values. Background technique

[0002] As an important equipment of the power system, the power transformer will have a serious impact on the normal power supply of the power supply system and equipment safety when it fails. Therefore, a protective device must be installed in the transformer for relay protection.

[0003] The main protection of the transformer is generally the longitudinal differential protection. Since the longitudinal differential protection needs to identify the excitation inrush current and the over-excitation operation state of the transformer, when a serious fault occurs inside the transformer, the fault cannot be removed quickly, which affects the stable operation of the power system. It will bring...

Claims

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