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Method and device for determining capacitive component parameters

A technology of component parameters and capacitance, applied to transformer/inductor parts, electrical components, measuring devices, etc.

Active Publication Date: 2019-10-18
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even though the reference bushing method is considered insensitive to system voltage fluctuations, it has been shown that bushing parameters are influenced by the temperature difference between the two bushings forming part of the respective transformer due to different loads, cooling conditions, age etc.

Method used

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  • Method and device for determining capacitive component parameters
  • Method and device for determining capacitive component parameters
  • Method and device for determining capacitive component parameters

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Embodiment Construction

[0036] The inventive concept will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. However, the inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete , and will fully convey the scope of the inventive concept to those skilled in the art. Throughout the specification, the same reference numerals refer to the same elements.

[0037]The present disclosure relates to a method of determining the capacitance and dissipation factor of a plurality of capacitances of a single electrical device. In this case, the method is particularly suitable for the determination of capacitive component parameters of an electrical device comprising a plurality of capacitive components. In particular, the electrical device is advantag...

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Abstract

The present disclosure relates to a method of determining the capacitance and loss-factor of each of a plurality of capacitive components of an electrical power device, wherein the method comprises: a) obtaining for each capacitive component a respective capacitance value and loss-factor value, and b) processing the capacitance values and the loss-factor values, wherein the processing involves removing a common influence of temperature on the capacitance values from the capacitance values and removing a common influence of temperature on the loss-factor values from the loss-factor values to obtain for each capacitive component a temperature-compensated capacitance value and a temperature-compensated loss-factor value.

Description

technical field [0001] The present disclosure generally relates to parameter determination of capacitive components of electrical equipment. In particular, the present disclosure relates to a method of determining the capacitance and dissipation factor of a plurality of capacitive components of a power device. Background technique [0002] Bushing monitoring is required due to the fact that bushing failures account for approximately 10% of transformer failures. There are a number of different methods of determining casing parameters for assessing casing condition. One technique is commonly known as the sum-current method, in which the bushing tap currents from all bushings of the transformer are measured and summed. As long as the vector sum is zero, it can usually be concluded that the bushing is functioning properly. If the vector sum is non-zero, it can usually be concluded that there is a casing fault. This method is generally temperature independent, as all bushing ...

Claims

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Application Information

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IPC IPC(8): G01R27/26
CPCG01R27/2605G01R27/2694G01R31/64G01R31/62G01R31/28G01R27/2688G01R31/40H01F27/402
Inventor N·阿贝维克拉玛T·本特森J·赫德伯格
Owner HITACHI ENERGY SWITZERLAND AG
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