Device for monitoring micro-water density of SF6 on line

Abstract

The invention discloses a device for monitoring the micro-water density of SF6 on line. The device comprises a sampling air chamber, an aeration connector, a processor, a display unit and an antifreeze auxiliary heating module, wherein the sampling air chamber, the aeration connector, the processor and the display unit form a monitoring unit; a pressure sensor, a temperature sensor and a dew point sensor are mounted in the sampling air chamber, and are connected with the signal processor; the processor is used for judging signals acquired by the pressure sensor, the temperature sensor and the dew point sensor and sending a result to the display unit for displaying. The device is adapted to an extremely cold climate condition, and has safe and reliable performance, the requirement of all-weather continuous running for 7*24 hours is met, and the temperature of a running environment can be as low as -55 DEG C.

Description

Technical field [0001] The invention belongs to the technical field of on-line monitoring of power transmission and transformation, and more specifically, relates to a device for on-line monitoring of SF6 micro-water density. Background technique [0002] With the development of the economy, the demand for electric energy in our country is increasing day by day, and the electric power system is gradually developing in the direction of large capacity, long distance and ultra-high voltage. The insulation performance of electrical equipment has an important impact on the normal operation of the power system, and the decline in insulation performance is a major factor in the failure of electrical equipment. SF6 gas has good insulation performance and arc extinguishing performance. As an important insulating medium, its application has been unprecedentedly developed. In high-voltage electrical equipment with SF6 as the insulating medium, when the pressure of SF6 gas drops or the gas ...

AI Technical Summary

Problems solved by technology

In extremely cold weather, changes in the physical properties of the electronic components of the online monitoring device lead to circuit inoperability; performance degradation of insulating materials and solder leads to some mechanical failures; sensor accuracy cannot fully meet the technical specifications, resulting in unreliable front-end data collection

Therefore, in extremely cold weather, the reliability of the online monitoring device cannot be guaranteed, and it is difficult to work stably for a long time in extremely cold weather conditions

However, the current on-site monitoring unit of the conventional SF6 micro-water density on-line monitoring system is an industrial-grade design, and its applicable ambient temperature is -40°C to +55°C (according to the State Grid Enterprise Standard "General Technology for On-line Monitoring Devices for Substation Equipment") "Specifications"), cannot meet the operational monitoring requirements in extremely cold areas, and there is no product and technology that can overcome the low temperature failure of the online monitoring system sensor

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