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Substation DC system straight-through current transformer non-power cutoff replacement checking method

A technology of DC system and core-through current, which is applied in the direction of instruments, measuring electrical variables, measuring devices, etc., and can solve problems such as secondary system function failure, DC transformer misoperation, etc.

Inactive Publication Date: 2018-06-19
国网江西省电力有限公司超高压分公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to disclose a method for checking the replacement of core-through current transformers in substation DC systems without power failure in order to solve the problems of misoperation and secondary system function failure in the replacement of DC transformers after power outages.

Method used

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  • Substation DC system straight-through current transformer non-power cutoff replacement checking method
  • Substation DC system straight-through current transformer non-power cutoff replacement checking method
  • Substation DC system straight-through current transformer non-power cutoff replacement checking method

Examples

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Embodiment Construction

[0025] The example of the present invention is composed of the non-power-off replacement check chart of the core-through current transformer of the DC system.

[0026] The DC system through-core current transformers are replaced without power failure and the calibration chart is provided by the first digital clamp meter CT 3 、The second digital clamp meter CT 4 , Wires, transformers to be replaced and their branches, switches, and loads.

[0027] The key steps of the specific implementation of the present invention:

[0028] (1) The wire is connected to the positive and negative DC bus and switch, the wire is connected to the load test of the DC transformer to be replaced, and the wire passes through the jaws of the digital clamp meter with the correct gear;

[0029] (2) Correctness check and judgment method.

[0030] The wiring is correct and the resistance is matched. Before replacing the DC transformer, meet:

[0031]

[0032] Where To flow through the replaced first current transfor...

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PUM

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Abstract

The invention discloses a substation DC system straight-through current transformer non-power cutoff replacement checking method. The method introduces a bypass digital clamp-type meter to form an equivalent current transformer, a correctness checking judgment method is put forward, and checking correctness on each current value is observed and compared; according to a replaced transformer branchoperation mode, the relationship between bypass current and the original branch current is monitored, and in combination of the correctness checking judgment method, the transformer replacement correctness is checked; and through adopting a non-power cutoff transformer replacement mode, shortcomings of power cutoff transformer replacement are remedied.

Description

Technical field [0001] The invention relates to a method for non-stop replacement and verification of a core-through current transformer of a substation DC system, and belongs to the technical field of substation secondary system operation management. Background technique [0002] The DC system of the substation is responsible for the monitoring, control, protection, and adjustment of the primary system equipment. It has the characteristics of complex system wiring structure, uninterrupted operation all year round, and wide-ranging points; at the same time, the DC transformer can perform insulation monitoring, loop monitoring, Current monitoring, signal acquisition and other functions. Due to the use of power failure to replace the DC transformer, there are potential safety hazards such as misoperation and failure of secondary system functions, which may easily lead to problems such as equipment malfunction and monitoring failure. [0003] A method for non-stop replacement and ver...

Claims

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Application Information

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IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 彭淑明叶爱民程文星鲁普天宋小欣周迪李俊蔡明陈武恝邓哲林周铀卢雨翔吴颖周盛陈艳华陶可京汪旭峰田国稳戴斌赖志刚周东叶荣民吴昊秦纪平叶芃何萍范黎锋滕安朱宁
Owner 国网江西省电力有限公司超高压分公司