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Secondary cable identification method and device based on asymmetric phase signals

A technology of secondary cables and phase signals, applied in the directions of measuring devices, frequency measuring devices, measuring electricity, etc., can solve the problems of missing drawings, increased difficulty in checking, accidents, etc., and achieves convenient and fast wire tracing, saving personnel and time. , the effect of improving work efficiency

Active Publication Date: 2021-07-02
ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some old substations, there are missing drawings and defaced cable plates, which makes the verification more difficult
In this case, it can only be determined through the power-on check of the spare core or manual exploration.
[0003] However, the spare core check method will have the situation that the cable cores are exhausted and there is no spare core; the manual confirmation work requires the staff to go through the cable layer and check section by section, which is time-consuming and laborious
In addition, both of these two methods have the behavior of dismantling and dragging the cable, which may easily lead to the connection between the running equipment and the wire core being pulled out, causing accidents

Method used

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  • Secondary cable identification method and device based on asymmetric phase signals
  • Secondary cable identification method and device based on asymmetric phase signals
  • Secondary cable identification method and device based on asymmetric phase signals

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Embodiment Construction

[0041] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] like figure 1 Shown, the present invention comprises the following steps:

[0043] Step 1: Add a side current transformer to the cable to be found, and generate an induced current on the cable to be found by applying the side current transformer, which is not equal to the frequency of the power frequency and the harmonic frequency of the power frequency, and make the current in the cycle positive and negative phase waveforms asymmetrical;

[0044] This technical solution adopts the law of electromagnetic induction, which is also called Faraday's law of electromagnetic induction. The phenomenon of electromagnetic induction refers to the phenomenon of induced electromotive force due to the change of magnetic flux. For example, when a part of the conductor of the closed circuit cuts the magnetic induction line in the magnetic fi...

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Abstract

The invention discloses a secondary cable identification method based on asymmetric phase signals, and relates to the field of cable identification. At present, when a secondary cable is checked, the cable is disassembled and dragged, and accidents are easy to occur. The method comprises the steps of processing an induced current waveform, and obtaining a signal source frequency current amplitude, a current cycle integral value and a current time integral value through FFT decomposition; if the difference between the signal source frequency current amplitude and the current cycle integral value generated on a suspected cable and the corresponding information applied on a cable to be searched is smaller than a set threshold value, and the difference between the induced current integral value and the corresponding information under the integral multiple time of the signal cycle and the power frequency cycle is smaller than the set threshold value, determining that the suspected cable is the opposite end of the cable to be searched. According to the technical scheme, the cable can be safely, quickly and effectively found at low cost, and the starting end of the cable can be accurately identified under the condition of poor connection of an earth screen, so that the personnel and the time are saved, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the field of cable identification, in particular to a secondary cable identification method based on an asymmetric phase signal. Background technique [0002] At present, secondary equipment in substations, such as protection, measurement and control devices, mostly transmit electrical quantities, binary inputs and signal quantities through cables. The expansion and renovation of substations inevitably involve the disconnection of secondary cables, and it is necessary to correctly check the direction of secondary cables. In the case of complete information and standardized equipment construction, you can find the opposite end of the cable by querying the cable plate and checking the drawings. However, in some old substations, there are missing drawings and defaced cable plates, which makes the verification more difficult. In this case, it can only be determined by electrifying the spare core or manually touching and crawling....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/58G01R19/25G01R23/16G01R23/06G01R15/18
CPCG01R31/58G01R19/2506G01R23/16G01R23/06G01R15/18Y02E60/00
Inventor 董亮清陈亦凯童重立位一鸣朱刚林毅林魁张明山万方培孙强苗晓君余兰
Owner ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER
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