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Research on High-precision Measurement and Modeling of High Voltage Electric Transformers

Author: CongHongWei
Tutor: YangZuoPu
School: Shanghai Jiaotong University
Course: Control Theory and Control Engineering
Keywords: High-voltage power transformers Hysteresis loop Remanence factor Kalman filter LSSVM
CLC: TM452
Type: Master's thesis
Year: 2012
Downloads: 26
Quote: 0
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Abstract

Protection of high-voltage power current transformer (CT) has important applications in the field of power system protection. Gapped current transformers - especially of TPY current Transformer with transient protection features in the more widely used in the power system. TPY level current transformer measurement methods often require high-voltage, high-current environment, the measurement process is cumbersome, noise. So TPY Current Transformer for efficient rapid measurement of production and improvement of the current transformer. To solve these problems, this paper is mainly to do the following work: (1) This paper first discusses the intelligent test technology on its characteristics, development status and key technologies. Starting from the point of view of the TPY level power current transformer transient performance testing requirements, combined with intelligent test technology on the the TPY-level electrical current transformer automatic test system design. In addition, according to the transformer transient saturation characteristics, this paper analyzes the advantages and disadvantages of commonly used test methods specified in GB, and in accordance with the national standard requirements designed a simple and accurate test improvements DC law test method, and in terms of hardware and software on the specific test system design process. In order to improve the reliability of the test system, increase the maintainability of the instrument, and add a remote diagnostic system used to maintain the operation of the system. (2) for flux measurements in the factory environment, noise, the TPY power current transformers for transient testing process easy because the Hall sensor zero drift and noise caused by inaccurate paper by analysis of the TPY current transformer core excitation process of internal flux relationship, based on the TPY current transformer special excitation characteristics, an application of the principle of Kalman filter data fusion phased measurement method, eliminating the measurement errors on the the impact of the high-precision measurement. After the processing of the Kalman filter, eliminating the problem of the accumulation of errors caused by the sensor zero drift, and can be obtained in the test more accurate and smooth curve. (3) how to create a current transformer model and simulation excitation curve. According to the test to get excitation curves and transformer parameters, using least squares support vector machine modeling, and made some improvement and perfection of traditional simulation model, which provides a more accurate description of the characteristics of the transformer The mathematical expression of the form.

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