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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.

Active Publication Date: 2020-02-11
INTEGRATED ELECTRONICS SYST LAB
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Problems solved by technology

At present, the differential quick-break protection of transformers usually adopts protection algorithms such as current full-cycle differential Fourier and small vector algorithm. This kind of algorithm needs to meet a certain length of data window to calculate and judge, and because the fixed value is fixed, the protection action time is basically the same as The severity of the fault is irrelevant, which is not conducive to reducing the impact on the transformer when a large current fault occurs

Method used

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

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Embodiment Construction

[0040] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] Such as figure 1 Shown is a schematic diagram of a typical differential protection action curve for transformer protection. In the figure, Id is the differential current, Iqd is the differential starting setting value, Isd is the differential quick breaking current setting value, and Ir is the braking current. The present invention mainly considers that the differential protection quickly operates to remove the fault in the event of a serious fault, that is, the action range is the quick-break action area in the schematic diagram. The action formula is as follows:

[0042]

[0043] In the formula: is the differential current of the transformer, calculated from the vector sum of the currents on each side, when the fault is more serious The larger the value;

[0044] Isd is the setting value of transformer differen...

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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.

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/045
CPCH02H7/045
Inventor 李波王秀广刘益青冯占华刘志利
Owner INTEGRATED ELECTRONICS SYST LAB
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