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Method and system for transformer dissolved gas harmonic regression analysis

A technology for dissolving gas and transformers, which can be applied to parts of transformers/inductors, analysis materials, and material analysis through optical means, and can solve problems such as inability to distinguish gas generation rates and gas generation rates

Inactive Publication Date: 2010-09-01
ARIZONA PUBLIC SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Existing dissolved gas analysis techniques are not capable of distinguishing gas generation rates due to faults and incipient failures from acceptable gas generation rates due to cyclic loading of liquid-filled power transmission equipment

Method used

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  • Method and system for transformer dissolved gas harmonic regression analysis
  • Method and system for transformer dissolved gas harmonic regression analysis
  • Method and system for transformer dissolved gas harmonic regression analysis

Examples

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Embodiment Construction

[0023] The present invention relates to an analysis method, a computer-readable medium containing executable code, and a system for analyzing the condition of electrical equipment monitored by a monitoring unit. The invention is described in connection with the monitoring of fault conditions in transformers located at substations of electric utility companies. Monitoring is performed by a dissolved gas analysis (DGA) unit, one or more DGA units performing on-line monitoring of each transformer. The analysis according to the invention provides an accurate determination of the actual gas generation rate in the transformer by eliminating the periodic influence of transformer load on the transformer gas generation rate. The results of the analysis can be used to determine the condition of the transformer so that trends in fault type, severity and / or gas generation rate can be determined and communicated to one or more responsible parties. As will readily become apparent in the en...

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Abstract

A transformer (26) is monitored by a dissolved gas monitoring device (28). A method (36) in the form of executable code instructs a processor (34) to analyze a condition of the transformer (26). The method includes receiving (90), from the monitoring device (28), data elements (60) in the form of values (70) of dissolved gases (72) associated with operation of transformer (26) during a period of time. Periodic characteristics responsive to the operation of the transformer (26) are identified (92) from the data elements (60). The periodic characteristics may include a daily (136), semi-annual (138), and / or annual (140) fluctuation of gas generation in response to transformer loading. A gas generation rate trend (112) is distinguished from the periodic characteristics, the condition of the transformer (26) is determined and its future condition may be predicted in response to the trend (112). The condition is presented to a user (58).

Description

technical field [0001] The present invention relates to the field of transformer management and fault monitoring systems. More specifically, the present invention relates to dissolved gas analysis (DGA) for determining the rate of gas generation during a time interval. Background technique [0002] Electricity transmission is the process of delivering electricity to consumers. Generally, the term "electricity transmission" refers to the bulk transfer of electricity from one place to another, for example, between a power plant and a substation near a residential area. Due to the large amount of power involved, power transmission is usually done at high voltage (100kV or above). Transformers are used at substations to step down the voltage to lower voltages for distribution to commercial and residential customers. Other power transmission equipment used by the electric utility industry includes, but is not limited to, tap changers, circuit breakers, switches, capacitors, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/00
CPCH01F2027/404H01F27/402H02H5/08
Inventor D·R·拉蒙塔涅
Owner ARIZONA PUBLIC SERVICE
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