Calibrating device for SF6 density relay checking instrument

Abstract

The invention discloses a calibrating device for an SF6 density relay checking instrument. The calibrating device comprises a controller, wherein the controller is connected with an industrial slate computer, a temperature sensor and to-be-checked density relay checking equipment, wherein the controller is connected with a signal line interface of the to-be-checked density relay checking equipment; the calibrating device further comprises a gas filling tube communicated with a gas filling port of the to-be-checked density relay checking equipment; a gas cylinder and a proportional valve are connected in series onto the gas filling tube sequentially; a gas pressure fine-adjustment assembly and a pressure sensor are further arranged on the gas filling tube; the gas pressure fine-adjustment assembly, the gas cylinder, the proportional valve and the pressure sensor are connected to the controller through a circuit; the controller is further connected with a storage device and a power supply; the pressure measurement range of the pressure sensor is 0-0.9 MPa; the resolution of the pressure sensor is smaller than or equal to 0.00002 MPa.

Description

technical field [0001] The invention relates to a sulfur hexafluoride density calibration instrument, which is specifically used for the verification and calibration of sulfur hexafluoride density relay calibration equipment. Background technique [0002] SF6 circuit breakers are high-voltage electrical appliances widely used in power systems. The reliable operation of SF6 circuit breakers has become one of the most concerned issues of the power supply department. The insulation and arc extinguishing performance of SF6 circuit breaker depends on the density of SF6 gas to a large extent, so the monitoring of SF6 gas density is particularly important. [0003] The monitoring of the SF6 circuit breaker is realized through the SF6 density relay, but the SF6 density relay needs to be calibrated regularly; the SF6 density relay calibration equipment on the market (existing technology) is used to regularly calibrate the SF6 density relay, and the current SF6 density relay There a...

AI Technical Summary

Problems solved by technology

[0003] The monitoring of the SF6 circuit breaker is realized by the SF6 density relay, but the SF6 density relay needs to be calibrated regularly; the SF6 density relay calibration equipment on the market (existing technology) is used for regular calibration of the SF6 density relay, and the current SF6 density relay There are many types of calibration equipment, including portable and centralized calibration workstations, etc.; there are also different accuracies and different inflation rates in the calibration system; for pressure sensors, they also need to be adjusted regularly; currently for these SF6 purposes There is no calibration instrument for relay calibration equipment, which is not conducive to industry monitoring, and is also very unfavorable to formulate industry standards that are more suitable for SF6 density relay calibration parameters

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