Magnetic flux leakage-temperature composite sensor for oil-immersed transformer and measuring method

Abstract

The invention discloses a magnetic flux leakage-temperature composite sensor for an oil-immersed transformer and a measuring method. The composite sensor comprises a light source, a 3dB optical fiber coupler, an optical fiber circulator, a sensor probe and a signal processing device, wherein the sensor probe is composed of a first collimator, a second collimator, a polaroid, a first magneto-optical crystal, a second magneto-optical crystal and a reflector. The sensor probe does not contain metal materials. According to the testing method, the composite sensor is applied, light emitted by the light source is divided into a first light beam and a second light beam through the 3dB optical fiber coupler, the light intensity of the first light beam and the light intensity of the second light beam are jointly processed through the signal processing device, and magnetic flux leakage and temperature measurement results are obtained respectively. Therefore, the magnetic flux leakage and the temperature in the oil-immersed transformer can be measured at the same time, detection is more convenient, the monitoring comprehensiveness of the transformer is improved, and the operation state of the transformer can be better reflected.

Description

technical field [0001] The invention belongs to the technical field of electrical measurement, and in particular relates to an oil-immersed transformer flux leakage temperature composite sensor. Background technique [0002] The power transformer is the core equipment of the power transmission system, and its operational stability and quick response to its fault conditions are critical. Under different working conditions such as inter-turn short circuit, winding deformation, and normal operation of the transformer, the most fundamental difference is the temporal and spatial distribution of the leakage magnetic field of the transformer. However, for the actual measurement and research of transformer leakage magnetic field, at present, in the prior art, only metal detection coils based on electromagnetic induction are used to measure transformer leakage magnetic field, but the existence of metal detection coils will pose a serious threat to transformer insulation and severely ...

AI Technical Summary

Problems solved by technology

[0003] At the same time, under normal operating conditions, the transformer will directly convert part of the electric energy into heat energy, resulting in a corresponding temperature rise in the transformer winding, which will further lead to a corresponding temperature rise inside the transformer, and the long-term high temperature of the transformer winding will seriously threaten its insulation. sex

If the temperature of the transformer is too high, the service life of the transformer will be reduced. If the temperature is too low, the load of the transformer will not be applied to the maximum extent, which will affect the efficient operation of the power system. Therefore, the internal temperature of the transformer is detected to detect the operating state of the transformer. system is of great significance

Images