RELATIVE BUSHING PARAMETER METHOD TO AVOID TEMPERATURE INFLUENCE IN TRANSFORMER ABSOLUTE BUSHING PARAMETER MONITORING

Title:

RELATIVE BUSHING PARAMETER METHOD TO AVOID TEMPERATURE INFLUENCE IN TRANSFORMER ABSOLUTE BUSHING PARAMETER MONITORING

Document Type and Number:

Japanese Patent JP2022169559

Kind Code:

A

Abstract:

To provide a method and monitoring device, for monitoring N transformer bushings operating in substantially the same environment.SOLUTION: A method comprises: a step (S2) of estimating an absolute value for capacitances of each of bushings; and a step (S3) of estimating an absolute value for a loss factor or a power factor of each of the bushings. The method also comprises: a step (S4) of calculating Δ values for all C values and Δ values for all F values, according to: ΔCX=CX-CX+1 for all values up to, and including, ΔCN-1, ΔCN=CN-C1 for ΔCN, ΔFX=FX-FX+1 for all values up to, and including, ΔFN-1, and ΔFN=FN-F1 for ΔFN; and a step (S5) of determining whether the Δ values are within predefined ranges.SELECTED DRAWING: Figure 1

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Inventors:

Abbey Wikrama, Niranga

Application Number:

JP2022123332A

Publication Date:

November 09, 2022

Filing Date:

August 02, 2022

Export Citation:

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Assignee:

HITACHI ENERGY SWITZERLAND AG

International Classes:

G01N27/00; G01N27/22

Attorney, Agent or Firm:

Patent Attorney Fukami Patent Office

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