On-line temperature measurement method and device for cable joint of high-voltage plant

Abstract

The invention relates to an on-line temperature measuring method for the cable joints of a high voltage device; three temperature sensors are stuck on the surfaces of three metal conductive bodies; current induction coils are sheathed on the metal conductive bodies; a power circuit, microprocessors and wireless emitters are arranged on the metal conductive bodies and sealed in an insulator by circuit boards; the digital identifying codes of the three output ends of the measured cable joints are written in the microprocessors of each own; three metal conductive bodies sealed by insulating materials are respectively arranged at the three-phase output ends of the cable joints; each current induction coil after inducing that the currents are processed by the power circuit provides a working power for the temperature sensor, the microprocessor and the wireless emitter of each own; the microprocessors emit the monitored temperature signals and corresponding identifying codes by the wirelessemitters; a wireless receiver receives the wireless electric signals of each circuit, demodulates the wireless electric signals into digital signals and transmits the digital signals to a display instrument; the display instrument receives and identifies three corresponding cable joints. The on-line temperature measuring method can instantly accurately monitor the temperature of the cable joints ofthe high voltage device on line.

Description

technical field [0001] The invention relates to an online temperature measurement method and a device for a cable joint of a high-voltage equipment, belonging to the technical field of high-voltage detection. Background technique [0002] The output terminals of high-voltage equipment such as high-voltage switches, transformers, and cable branch boxes all use an insulating sleeve with a metal conductor in the middle and an insulating material poured on the outside, and then connect the connection method of the cable joint. This connection method has the advantages of good insulation performance, convenient connection and flexible combination. However, during factory installation, the temperature rise of the cable joint is too high during power-on operation due to poor installation and fastening, or poor contact at the connection. In severe cases, the cable joint will be burned or even explode, causing a large-scale power outage . [0003] In response to the above problems,...

AI Technical Summary

Problems solved by technology

In order to ensure that the high-voltage bushing has sufficient insulation performance, it is usually not allowed to open a window on the insulating bushing to derive infrared emission signals. Even if optical fiber transmission is used, the insulation and creepage distance will be affected. This method is difficult to install and implement.

[0006] 3. The method of indirect temperature measurement on the surface of the high-voltage insulator: the metal heating element is enclosed in the insulator, the temperature sensor and the wireless or wired transmitter are installed on the surface of the high-voltage bushing and other connecting bodies, and the temperature of the insulator surface is measured. Indirect measurement of the temperature of the metal conductor encapsulated in the insulation is simple and easy, but it takes a certain amount of time for the temperature of the metal to be transmitted to the surface of the insulator, the real-time performance of the measurement is poor, and it is easily affected by the ambient temperature. Sex is not high

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