Detection system of sulfur hexafluoride density relay

Abstract

The invention discloses a detection system of a sulfur hexafluoride density relay. The detection system having the precise calibration function is capable of calibrating temperature compensation values of multiple groups of density relays once and is capable of recycling sulfur hexafluoride gas. The detection system is composed of a calibration assembly and a high-and-low-temperature test box. Thehigh-and-low-temperature test box consists of a box body, a refrigeration system, a refrigeration system box, a compressor, a control module and an electrical cabinet; the electrical cabinet is arranged at one side of the box body; a control module and a memory are arranged in the electrical cabinet; and a compressor and a refrigeration system are arranged in the refrigeration system box. The boxbody is divided into a test chamber, a return air passage and a refrigeration system box by a lower chamber bottom plate and a test chamber sidewall; a condenser, a heater and a centrifugal fan are arranged in the return air passage; and an air outlet and a return air outlet are formed in the test chamber sidewall. A test frame for supporting density relays and a standard pressure gauge are arranged at a test rack. The calibration assembly includes a controller.

Description

technical field [0001] The invention relates to a sulfur hexafluoride relay detection, which is specifically used for the calibration detection of a sulfur hexafluoride density relay. Background technique [0002] SF6 (sulfur hexafluoride) electrical products have been widely used in the power sector, industrial and mining enterprises, and promoted the rapid development of the power industry. How to ensure the reliable and safe operation of SF6 electrical products has become one of the important tasks of the power sector. SF6 gas density relay is one of the key components of SF6 electrical switch. 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 als...

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Problems solved by technology

[0003] The current sulfur hexafluoride density relay calibrator has a single function. Whether it is on-site calibration or centralized calibration, the calibration device can only be judged by comparing the pressure sensor value with the contact change and indication value of the density relay to be calibrated. Whether it is accurate or not, there is no more accurate and richer calibration function; at the same time, in the actual operation and maintenance of substations, we found that the temperature is too low (about minus 30 ℃) can easily cause the pointer SF6 density relay to alarm (or lock ), in the prior art, it is the first time to determine the on-site fault and carry out large-scale maintenance, but in fact, we found that in some cases, it was finally found that the temperature supplement function of the sulfur hexafluoride density relay did not work, such a To cause a lot of time, manpower and money waste; therefore, the correct detection step should be to detect whether the pointer type sulfur hexafluoride density relay is accurate and whether the temperature compensation of the pointer type sulfur hexafluoride density relay is accurate; for the pointer The detection of the type sulfur hexafluoride density relay currently includes a large number of equipment, specifically after being inflated through the air source, a high-precision sensor is used to compare the pointer value of the sulfur hexafluoride density relay; but there is currently no detection of the temperature compensation function, so As a result, the detection process of the sulfur hexafluoride density relay is not perfect

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