A gas density measuring device

Abstract

The invention provides a gas density measuring device, comprising: a three-way control valve, the three-way control valve includes a three-way control valve main body, the three-way control valve main body has an air inlet interface connected to the density relay interface of the GIS, and a mechanical The first air outlet port and the second air outlet port connected by the density relay; several temperature detectors, the temperature detectors are arranged inside the flange of the GIS shell, and the temperature detectors include the acoustic surface for detecting the temperature data of the position of the temperature detectors A wave temperature sensor; a processing assembly, the processing assembly includes a processing assembly housing, a temperature collector disposed inside the processing assembly housing, and a pressure sensor for detecting pressure data at the location; the temperature collector is wirelessly connected to the surface acoustic wave temperature sensor; The housing of the processing component is provided with an air circuit interface connected with the second air outlet interface and a bus outlet electrically connected with the control cabinet. The device can reduce measurement errors caused by temperature changes, and has good linearity and high measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of gas density measurement, in particular to a gas density measurement device. Background technique [0002] Gas insulated closed combined electrical appliances (English: GAS Insulated SWITCHGEAR, referred to as: GIS) are filled with a certain pressure of SF 6 As an insulating medium, gas has excellent insulating properties. When the internal pressure of GIS deviates from the rated value, the density relay can reflect the current pressure value of the air chamber in time, and output an alarm or blocking signal. [0003] At present, the commonly used density relay uses the spring tube as the measuring element, uses the built-in bimetal of the instrument to perform temperature compensation on the measured air pressure, and then converts it to obtain the current SF inside the air chamber at 20°C 6 Gas pressure value. However, this type of density relay has many shortcomings in practical applications: the spr...

AI Technical Summary

Problems solved by technology

However, this type of density relay has many shortcomings in practical applications: the spring tube, as a nonlinear element, only shows an approximately linear relationship with the gas pressure measured in the tube within a specific pressure range, and there is still a certain error; It can only compensate the temperature value of its location, while the interval of GIS is long. When there is a temperature gradient inside the GIS gas chamber due to factors such as direct sunlight and sudden temperature changes, the bimetal sheet cannot correctly compensate the actual temperature. , causing measurement errors, and then causing the density relay to issue false alarms or false blocking signals, seriously affecting the safe and stable operation of GIS

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