y-side differential protection current zero sequence phase eliminating compensation method for YNy2 transformer
A differential protection and phase compensation technology, 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 of preventing malfunction and being easy to implement
Inactive Publication Date: 2017-02-08
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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[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0030] Such as figure 1 Shown is the wiring diagram of the YNy2 transformer involved in the present invention.
[0031] In order to adapt to the integrated configuration of main protection and backup protection, we connect the secondary winding of YNy2 transformer high voltage side and low voltage side TA with star connection. The zero-sequence phase compensation scheme for Y-side differential protection current of YNy2 transformer is:
[0032] Connect YNy2 transformer high-voltage side, low-voltage side current transformer TA secondary winding to star connection.
[0033] Use the following formula to eliminate the zero-sequence current and phase conversion of the various currents on the Y side participating in the calculation of the differential protection current;
[0034] I · d ...
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The invention discloses a y-side differential protection current zero sequence phase eliminating compensation method for a YNy2 transformer. The method includes the steps of using Y-connection means for connecting TA secondary windings of high-voltage side and low-voltage side current transformers of the YNy2 transformer, firstly obtaining Y-side zero sequence eliminating current participating in differential protection calculation, conducting software phase shift and phase compensation for y-side current participating in differential protection calculation according to Y-side phase compensation principles based on the obtained phase of the Y-side current participating in differential protection calculation to obtain the phase of the y-side current participating in differential protection calculation consistent with the phase of the Y-side current participating in differential protection calculation. Rapid and convenient current phase compensation for differential protection of a YNy2 transformer can be realized through a software phase shift method. The method is applicable to software phase compensation for current of longitudinal differential protective devices of YNy2 wiring and Yy2 wiring transformers with various voltage levels of substations of a power transmission and distribution network. The method is simple and clear and is easy to realize.
Description
technical field [0001] The invention relates to a zero-sequence phase compensation method for Y-side differential protection current of a YNy2 transformer, belonging to the technical field of relay protection control equipment for 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 formulas to perform current phase shift to complete phase com...
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IPC IPC(8): H02H7/045
CPCH02H7/045
Inventor 李静汤大海易新陈永明曹斌曹海欧陈燕施伟成丁国华
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO