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A method and device for discriminating disconnection of CT secondary circuit

A technology of secondary circuit and identification method, which is applied in the direction of measuring device, fault location, and fault detection according to conductor type, etc. The effect of reliability

Active Publication Date: 2019-01-01
XUJI GRP +3
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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 method and device for discriminating the disconnection of the CT secondary circuit to solve the problem of misoperation of the differential protection for the disconnection of the CT secondary circuit

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  • A method and device for discriminating disconnection of CT secondary circuit
  • A method and device for discriminating disconnection of CT secondary circuit
  • A method and device for discriminating disconnection of CT secondary circuit

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Embodiment Construction

[0032] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0033] The invention provides a method for discriminating disconnection of a CT secondary circuit, mainly through the real-time collection and monitoring of the zero-sequence current of the algebraic sum of the instantaneous value of the three-phase current calculated by the software and the collected external zero-sequence current. Whether the CT secondary circuit is disconnected. The method of the invention can be applied to the discrimination of CT disconnection inside the analog quantity input type merging unit, and improves the reliability of the analog quantity merging unit.

[0034] The following takes the analog input type merging unit as an example to introduce. Of course, the discrimination method of the present invention can also be used in other CT acquisition equipment.

[0035] Such as figure 2 As shown, on the basis of the A, B, and C ...

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Abstract

The invention relates to a CT secondary loop circuit breaking determination method and device. The method mainly comprises the following steps: three-phase currents A, B and C are joined up in parallel, a zero sequence current is collected in real time after an external zero sequence CT is connected, the three-phase currents A, B and C and an external zero sequence current are all connected in an AD sampling channel, the zero sequence current is calculated in real time, the collected zero sequence current is compared with the calculated zero sequence current so as to determine whether a CT secondary loop circuit is broken. When CT secondary loop circuit breaking criteria are met, quality of a corresponding current channel is set as invalid, a broken line GOOSE warning signal is sent, relevant protection is locked after a protection device receives the invalid sampling channel, protection mal-operation can be prevented, and reliability of protection actions can be improved.

Description

technical field [0001] The invention belongs to the technical field of power system substation automation, and in particular relates to a method and a device for discriminating disconnection of a CT secondary circuit. Background technique [0002] In recent years, smart substations based on the IEC 61850 standard have entered the stage of comprehensive construction. Smart substations are mainly based on the sampling mode of conventional transformers connected to analog input merging units. As the key equipment of the process layer, the analog quantity input merging unit realizes functions such as analog quantity acquisition, AD conversion and combined synchronous output. [0003] In the design of the analog input merging unit, the secondary side of the conventional current transformer is connected to the internal CT of the analog input merging unit, and the CT converts the secondary current of the transformer into a small voltage signal for the analog input merging unit AD ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/083G01R31/088
Inventor 白申义李刚杨智德樊占峰赵应兵闫志辉郝威马仪成刘晓霞
Owner XUJI GRP