Method for online identifying measurement deviation fault for traction substation instrument transformer

A technology for traction substations and measuring deviations, applied in measuring devices, measuring electrical variables, instruments, etc., can solve problems such as difficulty in implementation, difficulty in popularization and application, and unsatisfactory recognition effects

Active Publication Date: 2015-09-23
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, the established model is based on theoretical assumptions, and inevitably deviates from the actual circuit structure and environment of the traction substation, resulting in an unsatisfactory recognition effect
Moreover, the circuit structure and component parameters of each traction substation are different, and each traction substation needs to be modeled separately, which makes its im

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  • Method for online identifying measurement deviation fault for traction substation instrument transformer
  • Method for online identifying measurement deviation fault for traction substation instrument transformer
  • Method for online identifying measurement deviation fault for traction substation instrument transformer

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specific Embodiment approach

[0041] A specific embodiment of the present invention is: a method for online identification of measurement deviation faults of transformers in traction substations, the steps of which are:

[0042] A. Modeling data selection and preprocessing

[0043] In the traction substation no-load and when each transformer is fault-free, select the data of continuous I moment from the transformer measurement effective value historical data, and construct the transformer historical measurement value matrix X=(x ij ) I×J , where x ij Represents the historical measurement effective value of the jth transformer at the i moment; i=1, 2,..., I, represents the moment of historical data; J is the total number of transformers;

[0044] Then, the transformer historical measured value matrix X=(x ij ) I×J Each column of data is standardized to obtain a standardized measurement value x' ij ,Right now in σ j Respectively, the average value and standard deviation of the jth column of the tra...

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Abstract

The present invention discloses a method for online identifying a measurement deviation fault for a traction substation instrument transformer. The method comprises the steps of: 1) modeling data selection and preprocessing: selecting data within I contiguous time points from instrument transformer valid measurement history data when a traction substrate is idle and all instrument transformer are operating properly, to form a matrix, and conducting standardized processing therefor; 2) establishing a primary element analysis model; 3) squared prediction error (SPE) calculation of the real-time sampling set of the instrument transformer; 4)online detection of the instrument transformer measurement deviation fault; (5) calculation of the SPE contribution values of the instrument transformers; and 6) identification of the instrument transformer subject to the measurement deviation fault. With the method according to the present invention, an instrument transformer subject to a measurement deviation fault can be online identified only by processing the measured valid data of all the instrument transformers in the traction substation, with no need of additionally arranging a waveform recording device. Therefore, the requirement on the hardware is low, the implementation cost is low, and the method is simple for promotion and application.

Description

technical field [0001] The invention relates to an online identification method for measurement deviation faults of transformers in traction substations. Background technique [0002] The transformer is an important equipment in the traction substation. It converts the high voltage and high current of the traction substation into low voltage and small current through electromagnetic induction for metering, monitoring and relay protection. If the transformer has a measurement deviation fault, that is, its output voltage or current value deviates, it will seriously affect the normal operation of the traction substation and the economical and efficient operation of the locomotive. In severe cases, it will cause relay protection to malfunction and cause safety accidents. Therefore, it is necessary to carry out online identification of the transformer, so that when the transformer has a measurement deviation fault, it can be dealt with in time to ensure the safe and reliable oper...

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Application Information

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IPC IPC(8): G06F17/10G01R35/02
Inventor 林圣李朝阳何正友王玘高仕斌
Owner SOUTHWEST JIAOTONG UNIV
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