State monitoring device and forewarning method for distribution network low-voltage cable branch box

Abstract

The invention discloses a state monitoring device for a distribution network low-voltage cable branch box. The state monitoring device comprises a main control module, a communication module, a switching position monitoring module, an intrusion monitoring module, a temperature and humidity measuring module, an indicating module, an electrical parameter measuring module, a temperature measuring module and a power module; a low-power-dissipation MCU is adopted for the main control module and is used for keeping alarm informing for a period of time after a circuit loses power, a communication mode that a physical layer is LoRa is adopted for the communication module, on this basis, obstacle avoidance, distance, anti-interference and power dissipation are optimized, and an upper-layer protocolis encapsulated; the electrical parameter measuring module comprises CT, PT and electrical parameter metering unit modules, and the power module comprises a power supply and a stand-by power supply.By means of the state monitoring device, remote active forewarning on the branch box is achieved through monitoring and combined analysis of power losing, overcurrent, leakage protection switching motions of the low-voltage cable branch box, over-temperature of busbars, switching cabinet door events and environment anomaly states, problems are timely found and solved, and the working efficiency ofoperation and maintenance personnel and the power supply reliability are improved.

Description

technical field [0001] The invention relates to the technical field of smart grid power distribution, in particular to a state monitoring device and an early warning method for a distribution network low-voltage cable branch box. Background technique [0002] At present, the distribution network has covered the monitoring of 10kV lines and the collection of user-side electrical parameter data, while the monitoring of low-voltage side inspection data in the distribution network station area has been relatively lacking. The monitoring system in the low-voltage station area of ​​the distribution network is installed on the main outlet line at the lower end of the distribution transformer, which can monitor the total load of the transformer in the station area, but lacks the daily monitoring of the outlet lines of each low-voltage branch, and the low-voltage cable branch box is particularly important in the low-voltage branch line. The stability of electrical equipment directly ...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of this technical solution are: 1. Potential hidden dangers brought by the battery: the system power module contains a battery to ensure that the system can work normally when the cable line is powered off, but since the cable branch box is installed outdoors, In the high temperature season, the temperature inside the box after exposure to the sun will be higher, which is likely to cause secondary disasters such as battery explosion, and in the low temperature season, it will lead to problems such as charging difficulties and insufficient battery vitality; 2. The system includes a communication module , but did not mention specific communication methods. In such monitoring systems, communication methods are directly related to system stability, data security, efficiency, operating costs, etc., and are particularly important in the entire system

[0006] The disadvantages of this technical solution are: 1. The device uses a GPRS module for communication and needs to rely on a third-party operator network for communication. The data security is unreliable, and there are still operating costs in the later stage; 2. The device only completes the communication The measurement of the temperature and humidity inside the cable branch box, the temperature of the connection point of the primary cable circuit and the insulation strength of the internal insulation parts are far from enough to reflect the working status of the cable branch box; And how to deal with when the cable loses power

[0007] Therefore, inventing a distribution network low-voltage cable branch box status monitoring device and early warning method to solve the problem of relative lack of branch line monitoring data in low-voltage station areas of the distribution network

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