System and method for monitoring thermal defect of high-tension switch cabinet on line

Abstract

The invention discloses a system and a method for monitoring a thermal defect of a high-tension switch cabinet on line. The system comprises a plurality of temperature sensors and a data processing system, wherein the data processing system receives data signals of the data processing system, analyzes a temperature rising value, and judges whether the thermal defect of the high-tension switch cabinet exists. According to the system and the method, the air temperature of the top of the space inside the high-tension cabinet is measured, the data processing system analyzes the data, whether the thermal defect exists in a compartment or between adjacent compartments is judged according to the characteristic of the change value of the air at the top of the compartment instead of according to a conventional temperature maximum value. A problem can be found in an initial period when the thermal defect occurs through judgment of the thermal defect, and an alarm is given when the limiting temperature is not reached, so that overhauling treatment can be performed before the limiting temperature occurs, and the fault accident is eliminated in an initial infancy period.

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. For example: Publication (Announcement) No.: CN202141526U document introduces a switchgear wireless temperature measuring device, the purpose of which is to use wireless transmission to solve the problem of data transmission from sensors installed in...

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 that of the test system, and it is very difficult to stop the switchgear once it is put into operation. What should I do if there is a problem with the test system during this period? Especially the most Is it possible to deal with and replace the sensors and connecting wires that are prone to failure after they fail? These are the problems that need to be solved urgently in the current online temperature measurement system of switchgear

[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