Software compensation type all-temperature SF 6 gas density relay check device

Abstract

The invention relates to check equipment, in particular to a software compensation type all-temperature SF 6 gas density relay check device capable of checking an SF6 gas density relay at an extremely low or high temperature. The check device comprises a housing and a high-low temperature-controlled cabinet outside the housing, and is characterized in that a density relay and a temperature sensor are arranged in the high-low temperature-controlled cabinet; an SF6 gas storage tank is fixed at the inner lower part of the housing; the top of the gas storage tank is connected with a four-way joint, and the other three ends of the four-way joint are respectively connected with a pressure sensor, a pressure regulation device and a controller capable of controlling an industry control computer; and all the pieces are connected through a gas connection pipe. In addition, the industry control computer is provided with a density relay actuating signal input port connected with a connecting wire. The check device provided by the invention has the advantages of unique structure, convenience in operation and use, high all-temperature precision, and reliability in check.

Description

technical field [0001] The invention relates to a calibration device, in particular to a full-temperature SF6 gas density relay calibration device which adopts software compensation and can perform calibration on an SF6 gas density relay in an extreme low temperature or high temperature state. Background technique [0002] SF6 gas density relay is one of the key components of SF6 electrical equipment. It is used to detect the change of SF6 gas density in the body of SF6 electrical equipment. Its performance directly affects the reliable and safe operation of SF6 electrical equipment. The SF6 gas density relay installed on the site does not operate frequently, and after a period of time, it often appears that the action is inflexible or the contact is poor. Some of them will also have poor temperature compensation performance. Density relay malfunctions. Therefore, the former Ministry of Electric Power formulated DL / T259-2012 "SF6 Gas Density Relay Calibration Regulations". ...

AI Technical Summary

Problems solved by technology

This method is mainly used in the field, but there are the following problems: (1) the temperature has a great influence, and it is difficult to ensure the accuracy; (2) the reading of the meter on the SF6 gas cylinder (relative pressure gauge) is very poor, The accuracy cannot be guaranteed. In addition, for density relays (absolute pressure relays) that use the method of measuring absolute pressure values, large errors may directly occur in areas with high altitudes; 3) SF6 density relays are actually used in the step-down process, while Using the inflation process to calibrate does not match the actual application and also affects the accuracy of the calibration

However, these calibration devices all have the same defect or error: these SF6 gas density relay calibrator can only test the SF6 gas density relay at normal temperature, but cannot perform SF6 gas density relay testing in the full working temperature range. Calibration, especially for SF6 gas density relays at extremely low or high temperatures

Because at room temperature, its accuracy is easy to achieve, and it cannot reflect safety and quality problems

However, these SF6 gas density relay calibrator can only test the SF6 gas density relay at normal temperature, but cannot calibrate the SF6 gas density relay in the full working temperature range, especially in the extreme low temperature or high temperature state. SF6 gas density relay is calibrated; there is no calibration device to overcome the above defects

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