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Transformer winding deformation and capacitance-type bushing fault detection device and method

A transformer winding and capacitor type technology is applied in the field of transformer winding deformation and capacitive bushing fault detection devices, which can solve problems such as capacitive bushing faults and achieve the effect of avoiding safe operation.

Pending Publication Date: 2017-08-29
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Application Information

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Problems solved by technology

[0004] This application provides a transformer winding deformation and capacitive bushing fault detection device and method to solve the existing problems of detecting transformer winding deformation and capacitive bushing faults

Method used

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  • Transformer winding deformation and capacitance-type bushing fault detection device and method
  • Transformer winding deformation and capacitance-type bushing fault detection device and method
  • Transformer winding deformation and capacitance-type bushing fault detection device and method

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Embodiment Construction

[0035] On the one hand, see figure 1 , which is a structural schematic diagram of a transformer winding deformation and capacitive bushing fault detection device provided in an embodiment of the present application. The device includes:

[0036] High voltage DC power supply controller 1, high voltage DC generator 2, waveform and partial discharge detection controller 3, waveform and partial discharge detector 6, DC charging control switch 4 and detection control switch 5;

[0037] The high-voltage DC power controller 1 is connected to the high-voltage DC generator 2; the high-voltage DC power controller 1 is used to control the DC voltage applied to the transformer; the high-voltage DC generator 2 is used to provide high-voltage DC voltage to the transformer;

[0038] The high-voltage DC generator 2 is connected to the DC charging control switch 4; the DC charging control switch 4 is used to control the charging process of the transformer by the high-voltage DC generator 2. Wh...

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Abstract

The application discloses a transformer winding deformation and capacitance-type bushing fault detection device and method capable of controlling opening and closing of the DC control switch and the detection control switch, measuring the resonance wave, the resonance wave time and the frequency characteristic of the transformer winding. The measured resonance wave is compared with the historical resonance wave to determine whether the transformer winding is deformed or not. The partial discharge magnitude of the capacitance-type bushing is measured, and the capacitance and the dielectric dissipation factor of the capacitance-type bushing are estimated according to the resonance wave time and the frequency characteristic. The partial discharge magnitude, the capacitance and the dielectric dissipation factor are analyzed to determine whether the capacitance-type bushing has defects or not. The device and method provided by the present invention can detect the transformer winding deformation and the capacitance-type bushing fault in time to protect the transformer from being influenced by emergency.

Description

technical field [0001] The present application relates to the technical field of power measurement, in particular to a detection device and method for transformer winding deformation and capacitive bushing faults. Background technique [0002] According to statistics, mild deformation of power transformer windings of 110kV and above and latent weak insulation faults caused by partial discharge between capacitor bushing capacitor layers are one of the main reasons for power transformer damage and grid failure. Winding deformation refers to the axial or radial dimensional change of the power transformer winding under the action of mechanical force or electrodynamic force, usually characterized by local twisting, bulging or displacement of the winding. When the transformer is subjected to short-circuit current impact or impact during transportation, winding deformation may occur, which will directly affect the safe operation of the transformer. The capacitor bushing is the out...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R27/02G01R27/26
CPCG01R27/02G01R27/26G01R31/1263
Inventor 刘红文王科
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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