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Method and device for testing polarity of current transformer, equipment and storage medium

A current transformer and polarity test technology, applied in the field of circuits, can solve the problems of giving polarity test results, faulty operation of relay protection devices, and inability to operate stably.

Active Publication Date: 2019-06-28
上海思源弘瑞自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All kinds of power system specifications and operating procedures require: for new installations or devices with large changes in the circuit, the polarity test of the current transformer should be carried out before putting into operation, in order to prevent the relay protection device from operating incorrectly and unable to stabilize due to reverse polarity run etc.
[0003] The existing polarity test method mainly uses the DC method, the AC method or the instrument method to determine the polarity of the current transformer. During the test process, the operation and maintenance personnel need to use a large number of instruments and equipment, and the wiring is complicated, time-consuming and laborious. After checking the polarity of the secondary circuit, it is necessary to check the secondary circuit to ensure that the connected terminal with the same name meets the circuit requirements. The calculation and derivation process is more complicated, especially when there are multiple branches with reversed polarity, the calculation amount will increase exponentially, and the operation and maintenance It is difficult for personnel to give accurate polarity test results in a short time, and the test efficiency is low

Method used

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  • Method and device for testing polarity of current transformer, equipment and storage medium
  • Method and device for testing polarity of current transformer, equipment and storage medium
  • Method and device for testing polarity of current transformer, equipment and storage medium

Examples

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Embodiment 1

[0044] figure 1 It is a flow chart of a current transformer polarity test method provided by Embodiment 1 of the present invention, and this embodiment is applicable to the case of performing polarity test of a current transformer in a bus protection device. Specifically, the current transformer polarity testing method can be executed by a current transformer polarity testing device, and the current transformer polarity testing device can be realized by means of software and / or hardware and integrated into the device. Further, the equipment includes, but is not limited to: electronic equipment such as desktop computers, single-chip microcomputers, and industrial computers.

[0045] refer to figure 1 , the method specifically includes the following steps:

[0046] S110. Obtain the differential current of the bus differential protection circuit and the current of each branch, where the bus differential protection circuit includes at least two branches.

[0047] Specifically, ...

Embodiment 2

[0053] figure 2 It is a flow chart of a current transformer polarity test method provided by Embodiment 2 of the present invention. This embodiment is optimized on the basis of the above-mentioned embodiments, and the determination of the branch with reversed polarity according to the differential current and the current of each branch is specifically described. It should be noted that this embodiment is applicable to the case of performing a polarity test on a single-branch reverse connection, and technical details not described in this embodiment can be referred to any of the above-mentioned embodiments.

[0054] Specifically, refer to figure 2 , the method specifically includes the following steps:

[0055] S210. Obtain the differential current of the bus differential protection circuit and the current of each branch, where the bus differential protection circuit includes at least two branches.

[0056] Specifically, the differential current and the current of each bra...

Embodiment 3

[0080] Figure 4 It is a flow chart of a current transformer polarity testing method provided by Embodiment 3 of the present invention. This embodiment is optimized on the basis of the above-mentioned embodiments, and the determination of the branch with reversed polarity according to the differential current and the current of each branch is specifically described. It should be noted that this embodiment is applicable to the case of performing a polarity test on the reverse connection of a single branch and a combined branch, and technical details not described in this embodiment can be referred to any of the above-mentioned embodiments.

[0081] Specifically, refer to Figure 4 , the method specifically includes the following steps:

[0082] S310. Obtain the differential current of the bus differential protection circuit and the current of each branch, where the bus differential protection circuit includes at least two branches.

[0083] S320. Whether the polarity detecti...

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PUM

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Abstract

The invention discloses a method and a device for testing polarity of a current transformer, equipment and a storage medium. The method comprises the following steps: acquiring a differential currentand branch currents of a bus differential protection loop, wherein the bus differential protection loop comprises at least two branches; determining the branches with reversed polarity according to the differential current and each branch current if the polarity detection condition is met. According to the technical scheme, the branch circuits with reversed polarity of the current transformer areautomatically determined according to the relationship between the differential circuit and the current of each branch circuit, and efficiency of polarity testing is improved.

Description

technical field [0001] The embodiments of the present invention relate to the field of circuit technology, and in particular to a current transformer polarity test method, device, equipment and storage medium. Background technique [0002] Bus differential protection is an important system equipment to ensure the safe and stable operation of the power grid. Its safety, reliability, sensitivity and rapidity are of decisive significance to ensure the safety of the entire regional power grid. In the bus differential protection circuit, the correct connection of the polarity of the current transformer (CT) is the key to ensure the correct operation of the relay protection. All kinds of power system specifications and operating procedures require: for new installations or devices with large changes in the circuit, the polarity test of the current transformer should be carried out before putting into operation, in order to prevent the relay protection device from operating incorre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06G01R35/02
Inventor 刘龙胡磊武焰陆征军韩行军孙万钱
Owner 上海思源弘瑞自动化有限公司