On-line monitoring device for sf6 gas density and micro-water content in high-voltage electrical equipment

Abstract

The invention discloses a device for monitoring SF6 (sulfur hexafluoride) gas density and micro-water content in high-voltage electrical equipment on line. The device is characterized by comprising two parts, namely a passive sensor arranged in an SF6 gas environment and a wireless transmitting / receiving device outside the high-voltage electrical equipment, wherein the passive sensor and the wireless transmitting / receiving device are separated from each other and are communicated with each other through a wireless signal in a range of 10-500m in the high-voltage electrical equipment, wherein the wireless transmitting / receiving device outside the high-voltage electrical equipment transmits exciting oscillation waves and receives a sensor feedback signal for the sensor inside the high-voltage electrical equipment respectively; the sensor in the high-voltage electrical equipment comprises an L-C pressure measurement circuit for measuring pressure, an L-C humidity measurement circuit for measuring humidity and an L-C temperature measurement circuit for measuring temperature which are not provided with a power supply and are respectively provided with internal antennas of equipment; the sensor is used for respectively generating resonance in a limited space after corresponding exciting oscillation waves are received and transmitting an electromagnetic oscillation sensing signal of the required distance and intensity.

Description

Technical field [0001] The invention relates to the technical field of insulation detection of electrical equipment, in particular to a SF in high-voltage electrical equipment 6 On-line monitoring device for gas density and water content. Background technique [0002] Thanks to SF 6 Gas has its unique physical properties. As an insulating gas, it has many advantages and is widely used in electrical equipment. SF 6 The relevant parameters of gas (density, water content) determine whether many electrical equipment can work normally. The breaking capacity and insulation performance of the gas are closely related to the pressure of the gas. The premise of ensuring the corresponding electrical performance is that the gas pressure is within a certain range. By SF 6 The change of gas density value can judge whether electrical equipment is leaking SF 6 The moisture in it not only affects the insulation performance and breaking performance of electrical equipment, but also affects the co...

AI Technical Summary

Problems solved by technology

This makes it difficult to process the special detection interface. Even if the special interface is used for detection, there will be air leakage to varying degrees, which will affect the accuracy of the measurement results.

Others for SF in high-voltage electrical equipment 6 The detection methods of gas density and micro-water also generally have problems such as complex design of the interface with the electrical equipment body, and difficulty in ensuring the sealing requirements.

If there is a line connecting the internal sensor of the device to the outside world or the sensor needs to be temporarily placed or replaced, there is SF 6 Possibility of gas leakage, but the internal sensor of the device cannot take power from the object to be measured, the self-contained battery needs to be replaced regularly, the maintenance cost is high, there is a personal safety problem or the operation needs to be powered off and it will cause gas leakage, external monitoring Facilities are often far away from high-voltage electrical equipment, which also makes monitoring inconvenient

The internal space of high-voltage electrical equipment is often limited. In order to ensure insulation, it is difficult to place various sensors for measuring various parameters.

[0004] Finding an Effective SF in High Voltage Electrical Equipment 6 The online monitoring method of gas density and micro-water content is of great significance to solve the problems of sealing and other problems existing in the current detection methods. The above problems are problems that must be solved by technicians in this industry

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