Calibration stand and calibration method for SF6 gas density and pressure monitoring device

Abstract

The invention discloses a calibration stand of an SF6 density-pressure monitoring device, which saves time and labor and has accuracy and high efficiency. The device comprises a high and low temperature box, an operating console, an operating cabinet connected at the rear end of the operating console, and a host arranged on the operating cabinet, wherein the host comprises a plurality of parallel connection interfaces of the SF6 density-pressure monitoring device to be tested, a gas circuit control system connected with the interfaces of the SF6 density-pressure monitoring device to be tested, a computer, a touch display screen and a printer, wherein the touch display screen and the printer are connected with the computer, the gas circuit control system comprises a vacuum pump, a gas storage cylinder, a work gas cylinder and a driving motor. The device has high calibration accuracy and can recycle SF6 used for calibration testing. The invention also discloses a calibration method of the SF6 density-pressure monitoring device.

Description

technical field [0001] The invention relates to a comprehensive calibration equipment for electrical devices, in particular to a SF 6 A calibration platform and a calibration method for a gas density-pressure monitoring device. Background technique [0002] SF 6 Gas density-pressure monitoring device (SF 6 Density relay) has been widely used in electrical engineering such as high-voltage power distribution switches, high-voltage power distribution equipment, and high-power transformers, which has promoted the rapid development of the power industry. SF 6 The gas density-pressure monitoring device is one of the key components of the electrical switch, which is used to monitor SF 6 SF in the electrical equipment body 6 The change of gas density, its performance ring directly affects the SF 6 Safe and reliable operation of electrical equipment. SF installed on site 6 Due to the infrequent action of the gas density-pressure monitoring device, after a period of time, the ...

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Problems solved by technology

[0004] 1. It is still relatively backward in terms of testing methods and testing accuracy

[0005] 2. It is difficult to disassemble and assemble the primary inflation interface and the secondary wiring interface. If there are batches of density relays to be replaced, it is very difficult to calibrate on site. The replaced density relays can only be placed in a constant temperature laboratory for comprehensive calibration. Calibration on bench

[0006] 3. The pressure value at ambient temperature can only be verified on site, and then the pressure value at this temperature is converted to the equivalent pressure value at 20°C, and then the relative pressure value at 20°C is used as the standard value to judge the density relay Therefore, the temperature compensation performance of the density relay cannot be verified

[0007] 4. The SF used for testing cannot be recycled 6 gas

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