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Current differential protection saturation distinguishing method

A differential protection reactance and current technology, which is applied in the field of fault saturation judgment outside the zone, can solve problems such as differential protection misoperation, and achieve the effect of accurate and fast identification

Active Publication Date: 2016-02-24
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] The purpose of the present invention is to provide an anti-saturation method for current differential protection, which is used to solve the problem that differential protection may malfunction when the external fault current transformer is seriously saturated

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Embodiment Construction

[0016] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] See figure 1 , figure 2 , a current differential protection anti-saturation method, the present invention is characterized in that the following different methods are used to comprehensively identify out-of-area faults to realize the identification of out-of-area fault saturation of current transformers:

[0018] (1) Use the short data window fast algorithm to calculate the differential current change, brake current change and voltage change: the change is the analog value after the fault minus the analog value before the fault to obtain the fault component. The short data window algorithm of the point can quickly obtain the differential current change, braking current change and voltage change during the fault period, and judge the order in which the differential current change, braking current change, and voltage change appear s...

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Abstract

A current differential protection saturation distinguishing method comprises the steps of: (1) adopting a short data window fast algorithm to calculate differential current variation, brake current variation and voltage variation; (2) adopting a half-wave integration algorithm to calculate differential current variation, brake current variation and voltage variation; (3) adopting original sampling values to calculate relation between current on the local side and current on the opposite side; (4) and adopting Fourier steady state quantity to calculate vectorial relation between the current on the local side and the current on the opposite side. The current differential protection saturation distinguishing method can distinguish whether a fault is an internal fault or an external fault quickly according to fault characteristics calculated by adopting different algorithms at the fault moment, and provides a theoretical basis for differential protection adopting CT application with various characteristics.

Description

technical field [0001] The invention relates to a method for judging the saturation of an external fault in a current differential protection. Background technique [0002] The saturation of current transformers is generally divided into two categories: one is steady-state saturation, that is, saturation caused by large-capacity short-circuit steady-state symmetrical current; Saturation due to magnetism. In the power system, due to improper selection of current transformers or continuous increase in system capacity, the current transformers carry a fault short-circuit current far exceeding the original design when a fault occurs, resulting in severe saturation of the current transformers. Current differential protection is a functional element widely used in power system relay protection. Whether an external fault malfunctions depends on the difference in the saturation characteristics of the transformers on both sides and the anti-saturation characteristics of the differen...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 刘柱揆曹敏毕志周董涛
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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