Secondary cable identification method and device based on asymmetric phase signals

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....

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

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