On-line monitoring system of high-voltage power cable running temperature

Abstract

The invention provides an on-line monitoring system of high-voltage power cable running temperature. The system includes a laser device, a bidirectional coupler, a constant-temperature slot, a signalprocessing circuit, a synchronization control module, a data storage device and a computer. The laser device, the bidirectional coupler and the constant-temperature slot are connected in series on a sensing optical-fiber link. Raman back-scattering light carrying temperature information returns to the bidirectional coupler after scattering of laser, which is emitted by the laser device, in sensingoptical-fiber. The bidirectional coupler is connected with the data storage device through the signal processing circuit. The data storage device and the computer are connected, and are used for converting optical signals into digital quantity, and storing the same into the data storage device after further signal processing to use the same for temperature calculation. The synchronization controlmodule is connected with the data storage device, the computer and the laser device respectively. The synchronization control module is used for sending synchronization clock control signals to the data storage device, the computer and the laser device for periodic collection of temperature signals.

Description

technical field [0001] The invention relates to the technical field of optical fiber temperature measurement, and more specifically relates to an online monitoring system for the operating temperature of a high-voltage power cable. Background technique [0002] Smart grids have higher and higher requirements for reliability and stability, which brings new challenges and opportunities to the daily operation and maintenance of the grid. In the power system, the power cable is mainly used for the transmission of electric energy. The insulation aging of the cable often occurs due to long-term operation. Due to the harsh external environment and high internal load current, local high temperature and even fire are caused. The traditional operation and maintenance method Daily inspections are mainly performed manually, which requires a lot of manpower and equipment, and cannot accurately and quickly reflect the health status of power cables, greatly affecting the safe and reliable ...

AI Technical Summary

Problems solved by technology

In the power system, the power cable is mainly used for the transmission of electric energy. The insulation aging of the cable often occurs due to long-term operation. Due to the harsh external environment and high internal load current, local high temperature and even fire are caused. The traditional operation and maintenance method Mainly rely on manual daily inspections, which requires a lot of manpower and equipment, and cannot accurately and quickly reflect the health status of power cables, greatly affecting the safe and reliable operation of the power grid

[0003] In addition, due to the influence of microwave and electromagnetic interference in high-voltage electrical equipment, it is difficult or impossible to obtain real test results by traditional temperature measurement methods

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