Connection analyzing method of electric relay protection circuit

A technology of relay protection and analysis method, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., and can solve the problems of high requirements for staff and time-consuming and labor-intensive relay protection lines.

Inactive Publication Date: 2009-12-30
西安爱邦电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0022] In order to solve the situation that it is time-consuming and labor-intensive to judge the wiring error of the relay protection line under manual conditions, and has high requirements f...

Method used

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  • Connection analyzing method of electric relay protection circuit
  • Connection analyzing method of electric relay protection circuit
  • Connection analyzing method of electric relay protection circuit

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Embodiment Construction

[0084] The invention provides a wiring analysis method in a power relay protection circuit. The method includes the following steps:

[0085] 1) Obtain the measured value and transformer parameters, the measured value includes the current effective value and phase of each winding of the transformer or each line of the busbar. Transformer differential protection line parameters include transformer connection mode, CT ratio of each winding, rated voltage of each winding, power supply mode of each winding, two-point wiring situation and each winding number; busbar differential protection circuit parameters include CT ratio of each line, each line Power supply mode, whether it is single busbar or double busbar, which busbar each line belongs to when double busbar, and the number of each winding.

[0086] 2) Convert the measured value into the effective value of the current and adjust the current amplitude. The specific implementation process is:

[0087] 2.1) Use the N-phase curr...

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Abstract

The invention relates to a connection analyzing method of a relay protection circuit in a power system. The method comprises the following steps: (3) judging whether the connection is correct or not according to the measuring value of each winding differentially protected by a converted main transformer or the measuring value of each circuit differentially protected by a bus; (4) performing first modification and judgment, and judging whether the connection way is correct or not after the first modification is finished; (5) performing second modification and judgment; (6) generating modified current effective value and storing the modified value satisfying the correct condition; and (7) outputting an analyzing result. The connection analyzing method of the relay protection circuit in the power system has high judgment and analysis reliability, simple use and convenient operation.

Description

technical field [0001] The present invention relates to a wiring analysis method of a relay protection line in a power system, in particular to a wiring analysis method for a current transformer CT of a main transformer (abbreviated as a main transformer) differential protection line and a bus differential protection line in a power system Whether the analysis and judgment are performed correctly and the wiring analysis method of the error location and error type is given. Background technique [0002] For the main transformer differential protection, it is necessary to calculate the resultant vector of each phase on the power supply side and the resultant vector of each phase on the load side. When each winding satisfies the phase angle balance, that is, the difference between the phases is 120°, and the phase sequence is the same, they are all positive sequence or negative sequence. At the same time, when the vector sum of each phase of the power supply side and the load ...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 穆明建
Owner 西安爱邦电气有限公司
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