System for checking sulfur hexafluoride density relay

Abstract

The invention discloses a system for checking a sulfur hexafluoride density relay, and includes a contract pressure gauge, a pressure source and a gas circuit system. A gas inlet end of the gas circuit system is connected with the pressure source, and an inlet valve is installed between the gas inlet end of the gas circuit system and the pressure source; an output end of the gas circuit system is communicated with atmosphere, and a vent valve is installed between the output end of the gas circuit system and the atmosphere; and at least two installation interfaces are parallelly arranged between the inlet valve and the vent valve in the gas circuit system, and the contrast pressure gauge is accessed to the gas circuit system through any one of installation interface. The system for checking the sulfur hexafluoride density relay compares pressure values of the sulfur hexafluoride density relay and the contrast pressure gauge under the same working state, thereby judging whether work of the sulfur hexafluoride density relay meets requirements, and achieving the purpose of checking the sulfur hexafluoride density relay; and at least two installation interfaces are arranged parallelly, so that multiple sulfur hexafluoride density relays can be detected at the same time.

Description

technical field [0001] The invention relates to the technical field of instruments, in particular to a calibration system for a sulfur hexafluoride density relay. Background technique [0002] Sulfur hexafluoride gas has excellent insulation properties, arc extinguishing properties and stable chemical properties, and is widely used in high-voltage switchgear. The density and purity of sulfur hexafluoride gas are directly related to the performance and reliable operation of the equipment. For example, the leakage of sulfur hexafluoride gas will cause its density to decrease, and may increase the water content of the gas in the equipment, thereby affecting the Insulation performance and breaking performance of the equipment. [0003] In order to monitor the gas density of sulfur hexafluoride, the high-voltage switchgear is equipped with a gas density relay (also known as a density monitor, a density controller, a density meter, etc.). In engineering practice, it is difficult...

AI Technical Summary

Problems solved by technology

[0004] At present, the verification methods of sulfur hexafluoride gas density relays are mainly the deflation method and the table look-up method. The deflation method can only judge whether the relay operates, but cannot measure the contact action accuracy of the relay. The reason is that the sulfur hexafluoride gas density relay The pressure gauge brought by itself may not be accurate and can only be used as a reference; while the accuracy of the look-up table method is low, this method is not suitable for workplaces that require high precision

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