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Monitoring method for CT measurement winding disconnection and three-phase current imbalance operation

A three-phase current and balance technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve problems such as three-phase current imbalance, and achieve the effect of easy technology implementation

Inactive Publication Date: 2020-03-27
广西电网有限责任公司防城港供电局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a CT measurement winding disconnection for the problems that the existing CT current disconnection or the CT current unbalance cannot be found immediately by manual methods in the three-phase unbalanced operation of the power equipment and the secondary open circuit operation of the CT measurement winding. and three-phase current unbalanced operation monitoring method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A monitoring method for CT measuring winding disconnection and three-phase current unbalanced operation, comprising the following steps:

[0028] Step (1) Add monitoring procedures for CT current disconnection and three-phase unbalance in the dispatching automation system;

[0029] The judgment logic for starting the monitoring program is as follows: first judge the switch position of the bay to which the equipment belongs, if the switch is in the open position, the monitoring program will not be started, if the switch is in the closing position, the monitoring program will be started, and the three-phase current will be compared The values ​​Ia, Ib, and Ic take the minimum value Imin and the maximum value Imax respectively;

[0030] Step (2) Judging the start-up conditions of the CT current disconnection and three-phase unbalance discrimination program, and starting the corresponding discrimination program;

[0031] When Imin=0, start the CT current disconnection disc...

Embodiment 2

[0039] A monitoring method for CT measuring winding disconnection and three-phase current unbalanced operation, comprising the following steps:

[0040] Step (1) Add monitoring procedures for CT current disconnection and three-phase unbalance in the dispatching automation system;

[0041] The judgment logic for starting the monitoring program is as follows: first judge the switch position of the bay to which the equipment belongs, if the switch is in the open position, the monitoring program will not be started, if the switch is in the closing position, the monitoring program will be started, and the three-phase current will be compared The values ​​Ia, Ib, and Ic take the minimum value Imin and the maximum value Imax respectively;

[0042] Step (2) Judging the start-up conditions of the CT current disconnection and three-phase unbalance discrimination program, and starting the corresponding discrimination program;

[0043] When Imin=0, start the CT current disconnection disc...

Embodiment 3

[0051] A monitoring method for CT measuring winding disconnection and three-phase current unbalanced operation, comprising the following steps:

[0052] Step (1) Add monitoring procedures for CT current disconnection and three-phase unbalance in the dispatching automation system;

[0053] The judgment logic for starting the monitoring program is as follows: first judge the switch position of the bay to which the equipment belongs, if the switch is in the open position, the monitoring program will not be started, if the switch is in the closing position, the monitoring program will be started, and the three-phase current will be compared The values ​​Ia, Ib, and Ic take the minimum value Imin and the maximum value Imax respectively;

[0054] Step (2) Judging the start-up conditions of the CT current disconnection and three-phase unbalance discrimination program, and starting the corresponding discrimination program;

[0055] When Imin=0, start the CT current disconnection disc...

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Abstract

The invention discloses a monitoring method for CT measurement winding disconnection and three-phase current imbalance operation. The monitoring method comprises the following steps that (1) adding aCT current disconnection and three-phase imbalance monitoring program to a dispatching automation system; (2) judging the starting conditions of the CT current disconnection and three-phase imbalancejudgment program, and starting the corresponding judgment programs; (3) if the starting conditions of the CT current disconnection and three-phase imbalance judgment program are met, judging whether the following alarm logic judgment conditions are met or not, and if the corresponding alarm logic judgment conditions are met, sending out a CT current disconnection alarm or a CT current imbalance alarm. A regulation and control watch keeper can immediately discover the abnormal operation state of the power equipment by dispatching the CT current disconnection alarm or the CT current imbalance alarm sent by the automatic system, monitoring of CT measurement winding disconnection and three-phase current imbalance operation is achieved, and monitoring is convenient.

Description

technical field [0001] The patent of the invention belongs to the field of power grid dispatching automation, and specifically relates to a monitoring method for CT measuring winding disconnection and unbalanced operation of three-phase current. Background technique [0002] According to the use of secondary equipment CT, CT can be classified into three categories, CT for measurement, CT for protection and CT for measurement. Da Xiaofeng described in an article entitled "Discussion on Increasing the CT Disconnection Detection Function of the Measuring Device": When the CT is disconnected, the following consequences will occur: (1) Due to magnetic flux saturation, its secondary side will produce Thousands of volts of high voltage, and the waveform changes, causing harm to operating personnel and equipment. (2) Due to the saturation of the magnetic flux of the iron core, the loss of the iron core increases, high heat is generated, and the insulation is damaged. Therefore, it...

Claims

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Application Information

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IPC IPC(8): G01R31/54G01R31/72G01R29/16G01R19/165
CPCG01R19/16571G01R29/16
Inventor 蒋婷肖平范耀波朱万生邓倩兰梁策刘新杰
Owner 广西电网有限责任公司防城港供电局
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