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Cable joint temperature measurement method

2023-06-25
With the increasing consumption of electricity, the development potential of the power network is becoming more and more rapid, and the reliability of the distribution equipment route is also clearly proposed. Wire and cable are the key safe channels for transporting electricity in large cities. Therefore, cable connectors are numerous in the complex distribution equipment Internet, and the security risks can not be underestimated. Reduced insulation level is usually the root cause of common failures in power engineering cable joints.

The level of insulation layer decreases, the leakage current expands, and the loss increases with the increase of temperature. The rise of temperature will accelerate the embrittlement of the insulation layer, the leakage current will expand, and the temperature will rise again, resulting in the penetration of the insulation layer. Therefore, the temperature of the cable joint can be used as a parameter of the operation of the wire and cable to detect the operation of the wire and cable.

There are many scientific research achievements in the temperature monitoring of wire and cable joints in the world, which are distinguished by data signal collection methods, and the key is electronic signal measurement and optical signal temperature measurement. The key of electronic signal temperature measurement method includes thermal resistance measurement and integrated sensor temperature measurement. The key of optical signal temperature measurement method includes infrared temperature measurement, fiber grating temperature measurement and distributed fiber temperature measurement based on Raman scattering.

Common temperature sensors are data temperature sensors, thermocouples, thermistors and so on. Digital power amplifier wireless temperature measurement method can immediately detect the temperature change of wire and cable joints, with low cost, no wiring, good reliability and wireless data transmission of temperature data signals, but the temperature sensor must use rechargeable batteries or small CT power supply system to work.

The defect of the rechargeable battery power supply system is that the battery needs to be replaced regularly and the rechargeable battery has poor resistance to high temperature. The small CT energy collection system is affected by the electric current of wire and cable. If the electric current is too small, the power supply system is insufficient. If the current flow is too large, it is easy to burn the small CT system. It can be seen that the power supply system of small CT lacks objectivity. In addition to the accurate measurement of the temperature of the wire and cable joint, the active wireless temperature measurement method is also commonly used in the temperature monitoring of high voltage switchgear.


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