Heat conduction type SF6 purity detector regulating circuit

Abstract

The invention discloses a heat conduction type SF6 purity detector regulating circuit which comprises a heat conduction tank, a gas inlet tube, a gas outlet tube, a filter piece, a buffer chamber, a detection chamber, a sealing insulating sleeve, a connecting wire, a fixed value resistor, a thermal sensitive resistor, a regulating circuit, a constant source current circuit, a bleeder circuit, an electric signal input circuit, a filtering circuit, a thermal conductivity cell circuit, an amplification circuit and an electric signal output circuit. The circuit has the beneficial effects that thethermal sensitive resistor is made of a platinum wire or a tungsten wire and has high sensitivity, the filter piece is made of a powder sintering material, and is capable of effectively filtering offimpurities such as moisture and granules in a measured gas, the gas inlet tube is communicated with the buffer chamber, the gas outlet tube is communicated with the detection chamber, the consequencethat pressure or a flowing speed is changed as a gas is directly fed into the detection chamber is avoided, the fixed value resistor has the resistance of 250Ohm, the fixed value resistor and the thermal sensitive resistor are connected in parallel, the current of the thermal conductivity cell circuit can be stabilized, and in addition, a protection function on the thermal conductivity cell circuit is achieved.

Description

technical field [0001] The invention relates to a pushing device, in particular to a thermal conductivity SF6 purity detector conditioning circuit, which belongs to the technical field of detection devices. Background technique [0002] SF6 is a colorless, odorless, non-toxic, non-combustible inert gas. It has good insulation and arc extinguishing properties. It is widely used in high-voltage electrical equipment. The safe operation of the power system is of great significance, which is related to the development of the national economy and Stability of people's lives, people's requirements for power supply reliability of power system are getting higher and higher. If SF6 gas leakage leads to density drop or gas moisture content exceeds the standard, it will cause hidden dangers in equipment and even lead to accidents. Therefore, it is necessary to control SF6 Purity is regularly tested. [0003] Detecting the purity of SF6 requires the use of a thermal conductivity SF6 pur...

AI Technical Summary

Problems solved by technology

[0003] Detecting the purity of SF6 requires the use of thermal conductivity SF6 purity detectors, and for the existing SF6 purity detectors, first, the sensitivity of the thermistor used is poor, and its resistance value does not change for small temperature changes. It will cause inconvenience and cause the sensitivity of the detector to be poor. Second, the gas entering the detector will contain impurities such as water vapor and particles, but they cannot be separated during detection, which will affect the detection results. Third, when the gas enters the When entering the detection chamber, it will cause pressure or flow rate changes in the detection chamber (6), which will also affect the accuracy of the detection results

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