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Balance equations based on winding circuit transformer protection research

Author: LiGongHua
Tutor: YangHao
School: Chongqing University
Course: Electrical Engineering
Keywords: Transformer Protection Transformer model Winding loop equilibrium equation Unbalanced current Parameter Estimation
CLC: TM772
Type: Master's thesis
Year: 2008
Downloads: 112
Quote: 0
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Abstract


The transformer is complete different voltage levels power conversion hub , is the most important electrical power system master device , one of its direct impact on the operating state of the power system safe and stable operation . Transformer is very expensive cost of main electrical equipment should be based on need to set the appropriate protection. In recent years , the transformer protection action correct rate has been low , far below the line protection and generator protection , and there is unexplained malfunction , the existing transformer protection has been unable to meet the power needs of the system . Therefore, the study is more effective, reliable transformer protection principle , to improve the performance of transformer protection has very important significance. Paper introduces the principle and the existing transformer differential shortcomings , the transformer primary protection program some new ideas to do a more comprehensive overview . Papers transformer model based on the existing principles of the protection of the shortcomings are analyzed , pointing out its roots in the delta winding ignored when containing unbalanced three-phase windings of the winding loops. Basic circuit equation from the transformer , the use of delta winding current imbalance to contact the three-phase circuit equation, indicating normal operation of the transformer winding loop equilibrium equation model , the model considers the triangular side unbalanced three-phase windings in any one phase windings on the primary and secondary side windings of the other two phases . According to an internal fault transformer winding parameters change , the equation no longer holds this characteristic is proposed based on balance equations of the transformer winding protection principle , and gives the criterion . Equilibrium equation -based transformer winding circuit protection principle is the key to accurate access winding loop equilibrium equation coefficients . Since the estimated parameters , according to their physical characteristics and transformer nameplate data , obtained more information . Therefore, the proposed use of constrained least squares estimation algorithms to balance the equation coefficients transformer winding estimate . Research needs for transformer protection , the analysis and summary based on previous experience , the establishment of the transformer and dynamic imitate true digital simulation model, simulation of a typical transformer operating conditions, and record the voltage and current data . Using the simulation data for the new principle was verified , and achieved good results.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system protection > Protection of components
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