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Longitudinal differential protection method of transformer

A technology of longitudinal differential protection and differential protection, 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 convenient implementation and simple principle

Inactive Publication Date: 2017-03-08
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Longitudinal differential protection method of transformer
  • Longitudinal differential protection method of transformer
  • Longitudinal differential protection method of transformer

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Embodiment Construction

[0025] Since microcomputer transformer protection is generally designed with integrated main protection and backup protection and dual configuration, the transformer differential protection requires YNy4 transformer high voltage side and low voltage side TA secondary windings to be connected in star connection. figure 1 It is the YNy4 transformer wiring diagram of the present invention. The current software phase compensation scheme of YNy4 connection transformer differential protection device is:

[0026] A transformer longitudinal differential protection method, comprising the following steps:

[0027] Step 1: Connect YNy4 transformer high-voltage side and low-voltage side TA secondary windings to star connection;

[0028] Step 2: For the Y side, perform phase conversion according to the following formula, that is, the current of each phase participating in the differential current calculation of the differential protection is:

[0029]

[0030]

[0031]

[0032] ...

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Abstract

The invention discloses a longitudinal differential protection method of a transformer, wherein the method is applied to main transformers with various voltage levels in substations with various voltage levels of a power transmission and distribution network so as to complete current phase compensation of zero-sequence current elimination by phase currents for YNy4 transformer longitudinal differential protection. The compensation method comprises: TA secondary windings of a high voltage side and a low voltage side of a YNy4 transformer are connected in a star-shaped connection manner; current phase compensation is carried out on a differential protection Y side and a differential protection y side of the YNy4 transformer by using a calculation method of zero-sequence current elimination by using a phase current difference, so that the misoperation of the transformer because of an external fault due to a zero-sequence current is prevented. For the differential protection Y side of the YNy4 transformer, current phase compensation is carried out by employing a calculation method of zero-sequence current elimination by using an inverted-sequence phase current difference based on a A-phase current as a reference. For the y side of the YNy4 transformer, current phase compensation is carried out by employing a calculation method of zero-sequence current elimination by using an inverted-sequence phase current difference according to a principle of the same phase with the Y-side corresponding current.

Description

technical field [0001] The invention relates to a transformer longitudinal differential protection method, in particular to a current phase compensation method for YNy4 transformer longitudinal differential protection phase current difference to eliminate zero-sequence current, belonging to the technical field of relay protection control 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, the secondary winding of Y-side current transformer (hereinafter referred to as TA) of YNd11 transformer adopts delta d-11 connection, and the secondary winding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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