Positive sequence counterclockwise negative sequence clockwise compensation method for low voltage side of transformer differential protection
A technology of differential protection and compensation method, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of not designing transformer differential protection current software, etc., and achieve the effect that the compensation scheme is simple, clear and easy to implement
Active Publication Date: 2019-04-02
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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However, at present, transformer protection manufacturers only design YNd11, YNd1 and YNyn12 transformer wiring groups and their wiring combinations differential protection current software phase compensation methods, and have not designed transformer differential protection for other wiring groups and wiring combinations. Current Software Phase Compensation Method
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[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Since microcomputer transformer protection is generally designed with integrated main protection and backup protection and dual configuration, transformer differential protection requires that the secondary windings of the transformer high voltage side and low voltage side current transformer TA of any wiring group be connected in a star connection.
[0047] The positive-sequence counterclockwise negative-sequence clockwise compensation method of the transformer differential protection low-voltage side of the present invention includes:
[0048] Step 1: Connect the secondary windings of the current transformer TA on the high-voltage side and low-voltage side of the transformer to a star connection;
[0049] Step 2: For the high voltage side, because the zero sequence current is to be eliminated The impact on differential protection, so the A-ph...
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The invention discloses a positive-sequence counterclockwise negative-sequence clockwise compensation method for the low-voltage side of transformer differential protection. For all 12 types of wiring group transformer differential protection, the high-voltage side adopts zero-sequence current elimination in the phase current, and the low-voltage side a Phase, b-phase, and c-phase are decomposed into positive sequence current and negative sequence current, and zero sequence current is automatically eliminated. The phase currents of the phases are consistent, and the currents of each phase of the negative sequence are based on the low-voltage side. After rotating clockwise (12-n)×30°, they are consistent with the phases of the currents of each phase on the high-voltage side. The current phase is consistent with that of each phase current on the high voltage side. The invention is applicable to a transformer longitudinal differential protection device for any combination of 1-12 points on the low-voltage side of the transformer, so as to fully meet the requirements of the current phase compensation of the transformer differential protection.
Description
technical field [0001] The invention relates to a fully wired transformer, in particular to a positive sequence counterclockwise negative sequence clockwise phase compensation method for differential protection of a low voltage side of a fully wired transformer, which belongs to the relay protection control technology of electric power transmission and distribution networks. Background technique [0002] Since the phases of the currents on each side of the transformer may be inconsistent, the transformer longitudinal differential protection (hereinafter referred to as the transformer differential protection) needs to perform current phase compensation. There are two methods of current phase compensation for transformer differential protection: 1. Traditional hardware phase shifting: for example, YNd11 transformer Y-side current transformer TA secondary winding adopts delta d-11 connection, and d-side current transformer TA secondary winding adopts Star Y-12 connection; 2. So...
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IPC IPC(8): H02H7/045
CPCH02H7/045
Inventor 汤大海李静朱月凯易新杜云龙
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO