On-line temperature measuring device for monitoring connecting portion between ring main unit and 10 kV cable head

Abstract

Provided is an on-line temperature measuring device for monitoring the connecting portion between a ring main unit and a 10 kV cable head. A wireless temperature sensor is arranged at the connecting position of the cable head and makes direct contact with a metal heating unit for acquiring data, the data are transmitted to an information collector arranged on the inner wall of the ring main unit through a wireless transmission technology, and the data are sent to a main control chamber through the wireless transmission technology after being processed by the information collector, wherein according to the arrangement structure of the wireless temperature sensor, a temperature measuring hole is formed in the rear of an European-type plug at the connecting position of the 10kV cable head, the bottom of the temperature measuring hole makes direct contact with threads of the European-type plug and is connected with the back of a metal conductor, the wireless temperature sensor is placed at the bottom of the temperature measuring hole and closely attached to the back of the metal conductor, and a hole between the wireless temperature sensor and the opening of the temperature measuring hole is filled with epoxy resin to ensure insulativity. The device overcomes the defect that in the prior art, contact-type temperature measurement can not be performed while the ring main unit operates, and the accuracy and the reliability for temperature measurement are greatly improved.

Description

technical field [0001] The invention belongs to the cable used for monitoring the ring network cabinet and the 10 kV ring network cabinet in the power system. Background technique [0002] As a new type of cable connection accessory, the insulating sheath of the T-shaped connector of the 10 kV ring main unit cable in the power system often causes high temperature and fire in actual outdoor use. To sum up the reasons, it is mainly because of the production process, installation process, product quality and environmental climate that the cable T-connector is burned out and leaks electricity or damages air leakage. After such a fault occurs, the entire ring network cabinet needs to be replaced by a power outage, and the cable T-shaped connector needs to be reinstalled and connected, which seriously affects the stability and reliability of the power supply, and the power outage also brings large economic losses. [0003] At present, there is no effective and accurate method...

AI Technical Summary

Problems solved by technology

This is mainly because the ring network cabinet is a fully enclosed switch cabinet and cannot be opened during operation. The infrared temperature measurement equipment commonly used in the current operation inspection cannot measure the temperature of its joints. If the temperature measurement hole is opened on the front plate of the cable chamber, Reduced the protection level of the ring network cabinet

easy to cause casualties

On the other hand, because the cable T-shaped connector has the characteristics of fully enclosed, high temperature resistance, and insulation, the traditional contact temperature measurement cannot effectively measure the accurate temperature.

The reason is that the current existing methods will cause false alarms and early warning signals, and the operation measures to prevent the thermal failure of the ring network cabinet joints are not intuitive and perfect.

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