Power cable real-time state monitoring and operation management system and measuring method of temperature of cable

Abstract

The invention provides a power cable real-time state monitoring and operation management system and a measuring method of the temperature of a cable. The power cable real-time state monitoring and operation management system comprises a distributed Raman temperature measurement sensing unit, a data acquisition subunit, an optical magnetic field sensing unit, a current data demodulator, an FPGA core processing subunit, an ARM core processing subunit, a magnetic field sensing head and an operation management server, wherein a temperature demodulator of the distributed Raman temperature measurement sensing unit and the current data demodulator of the optical magnetic field sensing unit are connected with the operation management server through Ethernet interfaces, an optical filter carries out band-pass filtering processing on Stokes light and Anti-Stokes light, light intensity signals of filtered back Raman scattering light are converted into electric signals through a photoelectric detection unit, the electric signals are amplified to obtain voltage signals corresponding to the temperature, the data acquisition subunit carries out A/D conversion on the voltage signals, an actual temperature value is obtained through calculation, the hidden danger of faults, with unobvious surface temperature rise, of the cable is eliminated, real-time fault recording is carried out on important cable taps, rapid contact locating of the hidden danger of the faults and accident analysis are facilitated, and real-time calculation of the current-carrying capacity is achieved.

Description

technical field [0001] The invention relates to a power cable real-time state monitoring and operation management system and a cable temperature measuring method, belonging to the technical field of power equipment monitoring. Background technique [0002] Cables are an important part of the power system. They are distributed in cable trenches, cable tunnels, cable bridges, and cable interlayers. Manual inspection is very inconvenient. Cables work live for a long time, are prone to aging and flammable faults, and cause serious accident losses. It is listed as one of the 25 key accidents for power system protection. According to statistics, 80% of the electrical fire accidents caused by electrical equipment in my country over the years are related to wires and cables. With the continuous deepening of urban network construction, the use of power cables has increased significantly, so the operation management, monitoring and maintenance of power cables are becoming more and mo...

AI Technical Summary

Problems solved by technology

[0004] The real-time ampacity calculation function requires a large amount of real-time load current data. The existing technology relies on the substation automation system to provide data, which increases the real-time data transmission flow in the substation and affects the real-time performance of basic production scheduling operations; on the other hand, the load current From the substation automation device or power distribution automation device, it is not easy to maintain synchronization with the fiber optic temperature monitoring system

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