Temperature thermocouple for high-voltage and ultrahigh-voltage power cable

Abstract

The invention relates to a temperature thermocouple for a cable, belonging to the research field of cable tests. For detecting the temperatures of a conductor, an insulating layer and an outer sheath of a cable and ensuring the detection synchronism, the invention provides a needle-shaped thermocouple which can be used for detecting the temperatures of the conductor, the insulating layer and the outer sheath of the cable at the same time after being installed for one time; therefore one-point synchronous temperature detection can be realized, workload of the temperature detecting process is reduced, and the synchronism and the accuracy of the temperature detection are enhanced. The temperature thermocouple can be used for detecting temperature of each structural layer of a simulated cable in a high-voltage and ultrahigh-voltage XLPE (Cross Linked Polyethylene) power cable type test and preverification, can realize the effect of one-time installation and one-time detection and can avoid temperature detection deviation caused by difference among different thermocouples.

Description

technical field [0001] The invention relates to a cable temperature measuring thermocouple and belongs to the field of cable test research. Background technique [0002] At present, in the type test and pre-qualification test of high voltage and extra high voltage XLPE power cables, such as figure 1 The method shown measures the cable conductor temperature of the analog circuit, but in many cases it is necessary to simultaneously measure the insulation layer and outer sheath temperature of high-voltage and ultra-high-voltage XLPE power cables. At present, T-type thermocouples are mainly used to measure the temperature of the insulation layer And the temperature of the outer sheath, because the temperature of the insulation layer and the outer sheath at the same point cannot be measured at the same time when measuring the temperature of the conductor, and problems such as inaccurate temperature measurement occur because the temperature is not measured at the same point. The ...

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Problems solved by technology

[0002] At present, in the type test and pre-qualification test of high voltage and extra high voltage XLPE power cables, such as figure 1 The method shown measures the cable conductor temperature of the analog circuit, but in many cases it is necessary to simultaneously measure the insulation layer and outer sheath temperature of high-voltage and ultra-high-voltage XLPE power cables. At present, T-type thermocouples are mainly used to measure the temperature of the insulation layer and the temperature of the outer sheath, because the temperature of the insulation layer and the outer sheath at the same point cannot be measured at the same time when measuring the temperature of the conductor, and problems such as inaccurate temperature measurement occur because the temperature is not measured at the same point

The existing insulating layer temperature measurement technology can only measure the temperature of the outer surface of the insulating layer, and cannot measure the internal temperature of the insulating layer

And the existing measurement needs to install three thermocouples in different places, and there may be measurement deviation due to different installation processes

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