Bridge Compensation Circuit for Insulation Gas Characteristic Sensor

Abstract

The invention relates to a bridge compensating circuit of an insulating gas feature sensor. The bridge compensating circuit is characterized in that a sensor a, a compensation sensor b, and equivalent resistors of resistance of both the sensor a and the compensation sensor b are respectively arranged at four bridge arms, and the bridge compensating circuit outputs a voltage signal corresponding to resistance of a sensitive membrane of the sensor a to bring convenience for calculating to obtain gas feature parameter values tested by the sensor a, wherein the sensor a is a gas sensitive sensor used for detecting a sulfur hexafluoride mixed gas extracted from GIS (gas insulated switchgear) equipment; the compensation sensor b is another gas sensitive sensor which is similar to the sensor a and interfered in the same way, but a sensitive membrane of the compensation sensor b is isolated by gas; at least one of the bridge arms of the bridge compensating circuit is connected with a flat tuning and fine tuning digital potentiometer of a control device for zero adjustment. The bridge compensating circuit can eliminate influences caused by zero drift of the sensors per se and field interference signals to improve the fault diagnosis accuracy of the GIS equipment.

Description

technical field [0001] The invention relates to the field of detection of insulating gas state of GIS equipment, in particular to a bridge compensation circuit of a sensor. Background technique [0002] Gas-insulated metal-enclosed electrical equipment (GIS) is a major electrical equipment in the power system. Its live conductors and insulators are all enclosed in metal shells, and are not affected by the external environment. It is suitable for use in areas with harsh environmental conditions and severe pollution. . The application of GIS equipment enables the development of compact, high-voltage, and large-capacity new substations. It has become an important way to transform substations in urban networks, and has played a very good role in improving the safe and economical operation of power production. [0003] However, one of the biggest drawbacks of GIS equipment is that it is expensive and must have a relatively clean environment for installation and maintenance. Due...

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Problems solved by technology

[0004] The gas characteristic sensor used in the existing sulfur hexafluoride gas detection method is faced with low detection sensitivity, large error, large temperature drift, and environmental temperature Compensation is difficult and there are many defects such as cross-sensitivity phenomenon, which makes it impossible to accurately detect the characteristics of sulfur hexafluoride gas

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