Real-time three-level monitoring and protecting system for operating state of intermediate joint of medium-voltage cable

Abstract

The invention provides a medium-voltage cable intermediate joint operating state real-time three-level monitoring and protection system, which comprises an on-site acquisition terminal, a main station monitoring platform and a mobile APP monitoring platform, and adopts an on-site automatic fire extinguishing device and a main station manual fire extinguishing device as main protection and standby protection respectively. The monitoring quantity of field data acquisition comprises current, temperature, humidity, partial discharge and smoke sensing, automatic fire extinguishing is adopted according to the temperature, and filtered measurement data is uploaded to a main station monitoring platform through GPRS. Through a main protection (automatic)-standby protection (manual) dual fire protection system, the problem of insufficient reliability of a single mode can be effectively solved, and the reliability of fire extinguishing action is improved. Based on a multi-sensor data fusion technology, the utilization rate of data and the precision of state monitoring, early warning and action of the terminal control platform are effectively improved, and the problems of false alarm and missing alarm caused by single monitoring quantity or faults of a field microcontroller are avoided.

Description

technical field [0001] The invention relates to the technical field of state monitoring of electrical equipment, in particular to a real-time three-level monitoring and protection system for the running state of an intermediate joint of a medium-voltage cable. Background technique [0002] In recent years, with the advantages of safety, reliability, stability, and beauty, power cable power supply has been widely used in the construction and transformation of urban and rural power grids, and the proportion of power supply in the 10kV distribution network is increasing. However, during the use of power cables, the cable insulation is damaged due to external force damage, the protective layer is corroded or the terminal is immersed in water, causing insulation degradation and moisture, long-term overload operation causes insulation aging, and the cable head is damp and polluted, resulting in insulation flashover, etc. In the process of using power cables, fires and explosions o...

AI Technical Summary

Problems solved by technology

However, the mainstream state monitoring solutions represented by the above patents often use a single monitoring quantity (temperature) as the state evaluation criterion, which requires high accuracy and sensitivity of the temperature sensor

When the temperature sensor fails or fails, many problems such as false positives and false negatives are prone to occur, and the cable condition monitoring scheme based on a single monitoring quantity has the problem of insufficient reliability

In addition, for accidents such as fire and explosion in cable joints, the above-mentioned patents fail to provide a clear and applicable protection solution

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