Photoelectric type voltage measurement-based transformer bushing dielectric loss spectrum detection device

Abstract

The invention relates to a photoelectric type voltage measurement-based transformer bushing dielectric loss spectrum detection device and belongs to the technical field of substations. According to the prior art, when the dielectric loss spectrum of an insulating bushing is measured based on a capacitive or resistance-capacitance type voltage transformer, an additional loss angle may be introduced, and an electromagnetic interference problem is difficult to eliminate. A frequency signal generator is simultaneously connected with a parallel electrode plate pair and the main insulating wiring terminal of a to-be-detected insulating bushing; a laser is connected with an electro-optic crystal assembly through a polarization-maintaining collimator A; the electro-optic crystal assembly is connected with the parallel electrode plate pair; a photoelectric detector is connected with a polarization-maintaining collimator B; a Rogowski coil is connected with the grounding wire of the to-be-detected insulating bushing; a current acquisition circuit is simultaneously connected with the Rogowski coil and a dual-channel analog-digital converter; the dual-channel analog-digital converter is simultaneously connected with the photoelectric detector and a central processing unit; the central processing unit is connected with the frequency signal generator; and therefore, the precision and anti-interference capability of the frequency spectrum detection of the insulating bushing can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of substations, in particular to a transformer bushing dielectric loss spectrum detection device based on photoelectric voltage measurement. Background technique [0002] Transformer high voltage bushing is an important part of transformer. The dielectric loss spectrum is an important characteristic parameter that reflects the insulation condition of the capacitor bushing. On-line monitoring of the dielectric loss of the capacitor bushing can effectively detect problems in the insulation structure of the bushing and prevent operational accidents. [0003] Since the traditional voltage transformer used in the dielectric loss detection is a capacitive or resistance-capacitance voltage transformer, a large inductive capacitance will be introduced during the measurement process, which will cause a large deviation in the measurement results in severe cases. The frequency characteristics of conventional voltage t...

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Problems solved by technology

[0005] In order to solve the problems that existing capacitive or resistance-capacitance voltage transformers introduce additional loss angles in the process of measuring the dielectric loss spectrum of insulating bushings and that it is difficult to eliminate electromagnetic interference, the invention provides a transformer bushing based on photoelectric voltage measurement. Tube dielectric loss spectrum detection device

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