YNy6 transformer differential protection y-side phase-shifting current phase compensation method
A differential protection and phase compensation technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problem of not designing transformer differential protection current software, etc., and achieve the effect of preventing malfunction and easy implementation.
Inactive Publication Date: 2017-03-08
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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Problems solved by technology
However, at present, transformer protection manufacturers only design differential protection current phase compensation methods for transformer wiring groups YNd11, YNd1, and YNyn12 and their wiring combinations, and have not designed transformer differential protection for other wiring groups and wiring combinations. Protection Current Software Phase Compensation Method
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0028] Such as figure 1 Shown is the YNy6 transformer wiring diagram that the present invention relates to.
[0029] Since the microcomputer transformer protection is generally designed with integrated main protection and backup protection and dual configuration, the transformer differential protection requires YNy6 transformer high voltage side and low voltage side TA secondary windings to be connected in star connection. The current software phase compensation scheme of YNy6 wiring transformer differential protection device is:
[0030] Step 1: Connect YNy6 transformer high-voltage side and low-voltage side current transformer TA secondary windings to star connection;
[0031] Step 2: Based on the Y side, for the Y side, because the zero-sequence current needs to be eliminated The impact on differential protection, so the A-phase current ...
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The invention discloses a YNy6 transformer differential protection y-side phase-shifting current phase compensation method. Zero-sequence current is eliminated from phase current for the Y side and y side of a YNy6 transformer, so that the malfunction of the differential protection of the transformer caused by the influence of the zero-sequence current can be prevented; as for the differential protection of the YNy6 transformer, phase compensation is realized by a method according to which the phase shift of the y side is adopted with the Y side adopted as reference, wherein the Y side utilizes a calculation method according to which sequential-phase current is adopted to eliminate zero-sequence current to carry out current phase compensation with A-phase current adopted as reference; as for the y side of the YNy6 transformer, the calculation method according to which sequential-phase current is adopted to eliminate zero-sequence current is adopted to carry out current phase compensation based on a principle that current phase is the same as the phase of corresponding current of the Y side. The YNy6 transformer differential protection y-side phase-shifting current phase compensation method of the invention is applicable to the current software phase compensation technical schemes of various kinds of longitudinal differential protection devices of multi-voltage-level transformers adopting YNy6 wiring of a transmission and distribution network substation. The method is simple and clear and is easy to realize.
Description
technical field [0001] The invention relates to a phase compensation method for YNy6 transformer longitudinal differential protection to eliminate zero-sequence current Y-side phase-shifting current, and belongs to the technical field of relay protection control equipment for 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 for current phase compensation of transformer differential protection: 1. Traditional hardware phase shifting: for example, YNd11 transformer Y side current transformer TA secondary winding adopts delta d-11 connection, d side TA secondary winding adopts star Y -12 wiring; 2. Software phase shift: that is, use software programs and calculation formul...
Claims
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CPCH02H7/045
Inventor 汤大海李静易新陈永明曹斌崔玉孙东杰马海薇陈燕施伟成
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO