SF6 and SF6 mixed gas density detecting device and method

Abstract

The invention relates to an SF6 and SF6 mixed gas density detecting device and method. The device comprises a box body, a sensor unit, a data processing unit and a data presenting unit; the output endof the sensor unit is connected with the input end of the data processing unit; the output end of the data processing unit is connected with the input end of the data presenting unit; the data processing unit and the data presenting unit are installed in the box body, and the box body is fixedly installed on a GIS tank body; according to the SF6 and SF6 mixed gas density detection method, a digital display method is adopted, reading errors caused by human are reduced, and density detection indicating values are important parameters for reflecting gas qualities of gases in a switch body; in addition to boundary protection of alarm / lockout contacts, maintenance personnel need to regularly check current density states and change trends, and during the meter reading process, the device and the method avoid reading deviations caused by influence of different viewing angles of people compared with indications of pointers.

Description

Technical field [0001] The present invention relates to a SF 6 And SF 6 A mixed gas density detection device and method belong to the field of gas density detection. Background technique [0002] Pure SF 6 (Sulfur hexafluoride) gas is a colorless, odorless, non-toxic, non-combustible gas under normal temperature and pressure. It has excellent insulation properties and arc extinguishing capabilities, and is an ideal insulation medium. With the rapid development of the power industry and the improvement of technical equipment, a large number of sulfur hexafluoride circuit breakers and fully enclosed combined electrical appliances are continuously put into construction and operation, and the amount of sulfur hexafluoride is increasing. [0003] However, SF 6 Gas also has its shortcomings in application: (1) It is more sensitive to the uniformity of the electric field, and its advantages can only be shown in a uniform or slightly uneven electric field; (2) SF emitted in the atmosphere ...

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Problems solved by technology

[0003] However, SF 6 Gas also has its disadvantages in application: (1) It is sensitive to the uniformity of the electric field, and it can only show its advantages in a uniform or slightly uneven electric field; (2) SF discharged into the atmosphere 6 The gas is difficult to degrade, exists for a long time, and has a cumulative effect on global warming; (3) SF 6 The price of gas is relatively high, which increases the cost

Temperature compensation is performed through elastic metal curved tubes or bimetallic strips, and the Betty-Bridgman equation is only applicable within a certain temperature range. If the temperature is too low or too high, the mechanical SF 6 There is a big difference between the density relay and the Betty-Bridgeman equation, resulting in a large error in the density value, which is far from the function of detecting the density value

[0008] b. Mechanical SF 6 The elastic metal curved tube or bimetal sheet of the density relay is placed outside the tank of the GIS equipment, and the temperature compensation generated by it is affected by the outside air temperature, not by the SF 6 The temperature of the gas changes, so the asynchrony of the temperature change leads to a certain error, especially under the extreme low or high temperature change, it cannot reflect the SF in real time 6 gas density change

[0009] Chinese Patent No. CN201510058436.0 Name: A low temperature resistant digital SF 6 The relay, which places the sensor outside the tank of the GIS equipment, does not really reflect the SF 6 gas density change

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