Partition differential method for connection mode for line transformer bank

A transformer group and wiring method technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of indistinguishable lines, etc., and achieve the effects of strong flexibility and applicability, strong economy and scalability

Inactive Publication Date: 2015-11-25
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The technical problem solved by the present invention is that in the existing line-to-line group protection, when a fault occurs within the

Method used

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  • Partition differential method for connection mode for line transformer bank
  • Partition differential method for connection mode for line transformer bank

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] The zoning differential method for the line transformer group wiring mode of the present invention can realize fast fault zoning of the line-changing group wiring mode without adding relay protection devices, such as figure 1 shown, including the following steps,

[0016] Step (1), install three-phase CTs on the line side, high-voltage side and low-voltage side of the transformer respectively, and install a line-transformer protection device on the line side and transformer side respectively, and the line-transformer protection device on the transformer side is connected to The three-phase current on the high-voltage side of the transformer, the three-phase current on the low-voltage side of the transformer, the line-changing group protection device on the line side collects the current on the line side, and the line-changing group protection device on the trans...

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Abstract

The invention discloses a partition differential method for a connection mode for a line transformer bank. The method comprises the steps as follows: 1) separately arranging three-phase CTs at a line side, and a high-voltage side and a low-voltage side of a transformer, and separately arranging line-change group protection devices are the line side and the side of the transformer, wherein the line-change group protection device located at the side of the transformer is interconnected with the line-change group protection device located at the line side via a fiber channel; 2) using current of the line side and the three-phase current of the low-voltage side of the transformer to form line-change group differential, the current of the line side and the three-phase current of the high-voltage side of the transformer to form line differential, and the three-phase current of the high-voltage side of the transformer and the three-phase current of the low-voltage side of the transformer to form transformer differential; 3) analyzing a motion behavior of the line-change group differential, the line differential or the transformer differential if the line transformer has a fault movement to fast locate that the fault is in the side of the transformer or the line side. The method of the invention achieves the fast fault partition of the connection node of the line-change group without increasing relay protection equipment, which has very strong flexibility and applicability.

Description

technical field [0001] The invention relates to the technical field of power system protection, in particular to a partition differential method for line transformer group wiring. Background technique [0002] The wiring method of line transformer group, because it can reduce the investment of primary equipment, is more and more used in power systems and industrial and mining enterprises, and the voltage level of the line transformer group connection method is getting higher and higher. However, the existing line-variable group protection transmits line-side information and transformer low-voltage side information through fiber optic channels to realize line-variable group differential. When a fault occurs within the protection range of the line-variable group, the fault cannot be distinguished from the transformer. The failure of the fault or the fault of the line has brought great trouble to the accident analysis and the rapid restoration of power supply. Therefore, it is...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H7/045
Inventor 陈实刘颖
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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