On-line Monitoring System and Method for Thermal Defects of High Voltage Switchgear

Abstract

The invention discloses an online monitoring system and method for thermal defects of a high-voltage switchgear, including a plurality of temperature sensors, a data processing system, and the data processing system receives data signals from the data processing system, and analyzes the temperature rise value to determine whether the high-voltage switchgear is There is a thermal defect. The present invention measures the air temperature at the top of the inner space of the high-voltage cabinet, then analyzes the data by the data processing system, and uses the characteristics of the change value of the air temperature at the top of the compartment to determine whether there is heat in the compartment or between adjacent compartments. Defects, instead of judging whether a fault occurs by the highest temperature value in the traditional way, through the judgment of thermal defects, the problem can be found at the initial stage of the thermal fault, and the alarm will be issued when it has not reached the limit temperature. Carry out maintenance and treatment before the extreme temperature appears, and eliminate the failure accident in the initial stage.

Description

technical field [0001] The invention relates to a temperature testing method and a testing system for a high-voltage switchgear, in particular to an online monitoring system and method for thermal defects of a high-voltage switchgear. Background technique [0002] In order to prevent local overheating due to poor contact, resulting in short-circuit accidents caused by insulation damage of the switchgear, people have developed various solutions for online temperature measurement of the switchgear. At present, various online temperature measurement methods are carried out for some individual contact points of the conductive circuit. Temperature information is transmitted from the high potential point to be received and displayed. Such as: Publication (Announcement) No.: CN202141526U document introduces a switchgear wireless temperature measuring device, its purpose is to utilize wireless transmission to solve the problem that the sensor installed in the high potential area tr...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the temperature sensor is installed in a place with a higher voltage, which greatly changes the original state of the equipment and the original electric field distribution and insulation distance, and there are certain potential safety hazards.

Therefore, the current online temperature measurement methods for switch cabinets are not comprehensive, and cannot achieve comprehensive monitoring of switch cabinets.

Even so, this local monitoring method that can only measure the temperature of a few contact points online has made the system very complicated. The complicated wiring and the installation of many related components have greatly changed the original state of the switchgear equipment. This will bring great difficulties to the operation and maintenance of the switchgear in the future

Moreover, the test system itself also has problems that need to be maintained

It is very certain that the life of the switchgear is much longer than the life of the test system, and it is very difficult to stop the switchgear once it is put into operation. During this period, what should be done if the test system has problems? In particular, is it possible to deal with and replace the sensors and connecting wires that are most prone to failure in time after they fail? These are the urgent problems to be solved in the current switchgear online temperature measurement system

[0006] In short, although the existing online temperature measurement methods of various switchgears can help to find the possible thermal defects of the switchgear due to poor contact to a certain extent, they are all based on the point-by-point monitoring mode, which can only be used for temperature measurement. The heating of a few contact points is monitored locally, and there are monitoring blind spots; and the current online temperature measurement methods focus on measuring the current temperature value of a certain contact point, and an alarm will be issued once the set value is exceeded. It is impossible to predict whether overheating will occur somewhere and intervene in advance; and the way of installing sensors at the contact point itself still has certain safety hazards; at the same time, various real-time online temperature measurement devices still have excessive changes to the original equipment of the switchgear , which affects the normal maintenance of the switchgear; in addition, once the monitoring system fails, especially if the sensor and the connecting line fail, there is a problem that it is difficult to maintain

Images