A secondary cable identification method and device based on an asymmetric phase signal

Abstract

The invention discloses a secondary cable identification method based on an asymmetrical phase signal and relates to the field of cable identification. At present, there are behaviors of dismantling and dragging cables during the secondary cable inspection, which is prone to accidents. The present invention processes the induced current waveform, and obtains the signal source frequency and current amplitude, current cycle integral value, and current time integral value through FFT decomposition; if the signal source frequency current amplitude, current cycle integral value and If the difference between the corresponding information applied on the search cable is less than the set threshold, and the difference between the integrated value of the induced current and the corresponding information under the integral multiple of the signal cycle and the power frequency cycle is less than the set threshold, then the suspected cable is determined to be the cable to be found the opposite end. The technical solution can find the cable safely, quickly, effectively and at low cost, and can also accurately identify the starting end of the cable when the ground network connection is poor, saving personnel and time, and improving work efficiency.

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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