Monitoring type cable intermediate joint

Abstract

The invention provides a monitoring type cable intermediate joint, which comprises an intermediate joint body and a cable, and further comprises a signal processor, a wireless transmitter and a data processing terminal, wherein an electricity taking device, a partial discharge sensor and a temperature sensor are arranged in the intermediate joint body, and the partial discharge phenomenon of the cable and the cable intermediate joint and the temperature of the cable intermediate joint can be monitored. The partial discharge sensor comprises a composite sensing antenna, a plurality of short-circuit plates distributed at equal intervals along the circumferential direction of a radiant panel are connected between the radiant panel and a grounding plate of the composite sensing antenna, the short-circuit plates are provided with switch pieces capable of controlling the short-circuit plates to be switched on or switched off, the states of the switch pieces are controlled to enable the short-circuit plates at different positions to be switched on, and the working center frequency of the composite sensing antenna can be changed, so that the frequency band range which can be covered by the composite sensing antenna is relatively wide.

Description

technical field [0001] The invention relates to the field of cable intermediate joints, in particular to a monitoring type cable intermediate joint. Background technique [0002] As an important part of the modern power system network, cables and cable intermediate joints will deteriorate the insulation layer due to aging, moisture, mechanical loss and other reasons after long-term operation, resulting in a decrease in electrical insulation strength and causing cables and cables. The partial discharge phenomenon of the joint. In addition, the intermediate joint of the cable is a frequent point of failure. The partial discharge phenomenon can easily cause the overheating of the intermediate joint of the cable, and the overheating will cause the deterioration of the insulation layer and aggravate the partial discharge of the intermediate joint of the cable. Therefore, there are It is necessary to monitor the partial discharge phenomenon of cables and cable intermediate joints,...

AI Technical Summary

Problems solved by technology

[0002] As an important part of the modern power system network, cables and cable intermediate joints will deteriorate the insulation layer due to aging, moisture, mechanical loss and other reasons after long-term operation, resulting in a decrease in electrical insulation strength and causing cables and cables. The partial discharge phenomenon of the joint. In addition, the intermediate joint of the cable is a frequent point of failure. The partial discharge phenomenon can easily cause the overheating of the intermediate joint of the cable, and the overheating will cause the deterioration of the insulation layer and aggravate the partial discharge of the intermediate joint of the cable. Therefore, there are It is necessary to monitor the partial discharge phenomenon of cables and cable intermediate joints, as well as the temperature of cable intermediate joints

[0003] Furthermore, the frequency band range of the partial discharge signal of the cable and the intermediate joint of the cable is relatively wide, but the frequency band range covered by the existing partial discharge detection technology is relatively narrow, causing a large number of partial discharge signals outside the frequency band range to be unable to be received. Therefore, Receiving partial discharge signals in a wide frequency band is a difficult point to be solved at present

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