Internal temperature on-line monitoring method, device and system for SF6 high-voltage electrical equipment

Abstract

The invention discloses an internal temperature on-line monitoring method for SF6 high-voltage electrical equipment. The method comprises the following steps: measuring the first pressure value and the first temperature value of gas inside SF6 high-voltage electrical equipment, and obtaining the density of gas inside the SF6 high-voltage electrical equipment according to the first pressure value and the first temperature value; measuring the second pressure value of gas inside the SF6 high-voltage electrical equipment, and obtaining the internal temperature of the SF6 high-voltage electrical equipment. Through continuous monitoring and system modification, the accurate density of gas inside the SF6 high-voltage electrical equipment is obtained in time, and data processing is conducted by utilization of the SF6 gas pressure-temperature characteristic relation so as to obtain the corresponding SF6 high-voltage electrical equipment internal temperature value. The invention further provides an SF6 high-voltage electrical equipment internal temperature on-line monitoring device and system, real-time and accurate measurement on the internal temperature and / or density of the electrical equipment is realized, the detection cost is reduced, and the suitability for engineering application is higher.

Description

technical field [0001] The invention relates to a temperature monitoring device for high-voltage electrical equipment, in particular to a SF 6 A method, device and system for online monitoring of internal temperature of high-voltage electrical equipment. Background technique [0002] At present, with the rapid economic development, the capacity of my country's power system has expanded rapidly, especially the use of high-voltage electrical equipment such as GIS is increasing. Sulfur hexafluoride (GIS) high-voltage electrical equipment has been widely used in the power sector and industrial and mining enterprises. When GIS electrical equipment is working, temperature is one of the important parameters to measure the operating state of electrical equipment. The normal heating of each component (especially the components inside the gas chamber) should not exceed its maximum allowable temperature, so as to ensure the reliable and safe operation of the equipment. However, existi...

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Problems solved by technology

[0004] Infrared radiation non-contact and contact temperature online monitoring using thermal sensitive devices also have the following defects: the accuracy and reliability of non-contact temperature measurement are affected by factors such as lens optical deformation, shooting angle, shooting distance, surface shape, temperature and other factors. The temperature is inaccurate; because the air chamber of GIS high-voltage electrical equipment is fully enclosed, it is difficult to measure, and the voltage level of GIS high-voltage electrical equipment is high, and the insulation requirements are higher. At present, contact products mainly include wireless electromagnetic emission type, optical fiber type and There are three types of open air infrared products, and these products can only be used for open 12KV switch cabinets and ring network cabinets, and they are helpless for fully enclosed GIS high-voltage electrical equipment

But to SF 6 On-line temperature measurement inside the gas chamber of high-voltage electrical equipment has always been a difficult problem

Since the air chamber of high-voltage electrical equipment is a fully sealed system, the temperature of each point in the still gas is different, and the SF 6 The heat transfer performance of gas is very poor, so the internal temperature cannot be directly measured at the gas outlet

[0006] Therefore, those skilled in the art are committed to developing a new type of SF that can solve the problem of inaccurate online measurement and difficulty in reflecting the temperature of the main gas chamber. 6 On-line monitoring method and device for internal temperature of high-voltage electrical equipment

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