Intelligent monitoring system of distribution network switch cabinet

Abstract

The invention relates to an intelligent monitoring system of a distribution network switch cabinet. The system adopts an embedded installation technology to carry out intelligent monitoring on operation state of equipment in a switch station on the basis of an ultra-high-frequency partial discharge detection technology and a temperature monitoring technology. The problem of difficulty in real-time monitoring on the environment temperature and the equipment insulation state in the switch station cabinet is effectively solved. Equipment insulation state data is transmitted in real time; the partial discharge of a cable terminal, a busbar, a switch on-off device and the like in the switch cabinet caused by insulation defects or insulation aging can be monitored in real time; the development trend and the operation state of the insulation defects in a distribution network cabinet are monitored in real time; the insulation defects or faults which can become more severe can be discovered and warned in advance. When the system is put into operation, the safety operation level and the intelligent management level of the switch station can be greatly improved; serious power failures and fire accidents caused by the insulation defects of the equipment can be effectively avoided, and periodic detection is changed to be condition overhaul. The safety reliability and the automation degree of power system operation are improved.

Description

technical field [0001] The invention relates to a monitoring technology for state maintenance of a switch cabinet in a distribution network, in particular to an intelligent monitoring system for a switch cabinet of a distribution network. Background technique [0002] In the power distribution system, due to the many branches of the line, the complex operation mode, frequent load changes and the mixing of old and new equipment, the reliability of power supply is greatly affected. Therefore, it is necessary to monitor the equipment in the distribution network system to prevent problems such as equipment aging and insulation degradation, and avoid damage to equipment and interruption of power supply. [0003] The traditional monitoring technology of distribution network switchgear mainly includes manual line inspection, test and other detection technologies. The traditional technical means mainly rely on the withstand voltage test to check the insulation performance when the e...

AI Technical Summary

Problems solved by technology

[0003] The traditional monitoring technology of distribution network switchgear mainly includes manual line inspection, test and other detection technologies. The traditional technical means mainly rely on the withstand voltage test to check the insulation performance when the equipment is powered off. The withstand voltage test can find relatively large insulation defects. However, there is still the possibility of accidents in the switchgear after the withstand voltage test, because some tiny defects cannot be found by the withstand voltage test alone.

At the same time, since the preventive test cycle interval of the distribution network switchgear is 3-6 years, there is nothing to do about the insulation defects between the two preventive test intervals.

[0004] However, the current manual line inspection method can only regularly monitor the heating conditions of the connecting parts such as contacts with infrared thermal imaging cameras, thermometers or temperature display patches. This method can only measure the temperature exposed outside. There is no way to monitor the contact temperature of the existing discharge, insulation and other accident hazards, and there is no way to monitor the temperature in the metal-enclosed switchgear.

Moreover, since the distribution network switchgear is a closed device, and the shell has a shielding effect, some live detection technologies, such as infrared and ultraviolet technologies, have poor measurement results.

As a result, the distribution network switchgear of the prior art can only adopt the maintenance method of regular and power failure