Device for monitoring cable head fault online and monitoring method thereof

Abstract

The invention relates to the technical field of cable monitoring, in particular to a device for monitoring a cable head fault online and monitoring method thereof. The device comprises an optical fiber temperature measurement probe, an instrument, an optical fiber patch cord, a sheath and a high-temperature strapping tape, wherein he optical fiber temperature measurement probe is fixed on the surface of a cable head corresponding to a hot spot through using a high-temperature adhesive tape, the optical fiber temperature measurement probe is connected with an instrument through the optical fiber patch cord, and the sheath wraps the outer sides of the optical fiber temperature measurement probe and the cable and is fastened and fixed by the high-temperature strapping tape.

Description

technical field [0001] The invention relates to the technical field of cable monitoring, in particular to a device and a monitoring method for on-line monitoring of cable head faults. Background technique [0002] There is no specially designed temperature measurement system for the cable head of the 10-20kv closed ring network cabinet. The cable head conducts electricity through contact, and it is easy to generate heat, which has potential safety hazards and may cause electrical accidents. [0003] At present, equipment such as infrared thermometers and handheld partial discharge testers are used to regularly inspect power distribution equipment and cable heads. They do not even touch the surface of the cable head, and the measured temperature is very different from the actual heating temperature. . In recent years, wireless temperature measurement systems have also appeared on the market, which can be more direct and effective than the former. There are two obvious probl...

AI Technical Summary

Problems solved by technology

In recent years, wireless temperature measurement systems have also appeared on the market, which can be more direct and effective than the former. There are two obvious problems: the first is that the sensor is independent, so after the equipment has been running for a period of time, the sensor will inevitably become loose or even fall off.

The second is that this kind of sensor is only in contact with the surface of the cable head, so there is still a relatively large deviation between the final measured temperature and the actual heating temperature

The third is that this kind of sensor uses battery power supply in terms of power supply, and the battery life problem makes the use of this kind of sensor unable to achieve meaningful maintenance

[0004] Furthermore, we do everything possible to measure the temperature of the hot spot, but we still need to manually judge whether the contact is not in good contact. If we think that the temperature is "abnormal", it is determined that the cable head has a contact fault. This is not rigorous, because, in addition to the change of the ambient temperature, The current flowing through the contacts is a very important factor. Judging by the temperature alone, it is impossible to confirm whether the contacts are defective when the current is small. When the short-term overload current is allowed, the short-term temperature rises too fast and it is easy to cause misjudgment.

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