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The Developmentof Substation Fault Analysis System and the Study of New Fault Location Method for Transmission Line

Author: ZhangXiaoMing
Tutor: XuYan
School: North China Electric Power University
Course: Proceedings of the
Keywords: Transformer substation Failure Analysis Merge Spectrum analysis Fault location
CLC: TM774
Type: Master's thesis
Year: 2011
Downloads: 28
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Abstract


The current grid failure analysis system exists not standardized information access , lack of information pretreatment , the comprehensive utilization of information and insufficient shortcomings . This article is designed substation real-time and off - line failure analysis system set based fault recording and protection of information . Solve the fault recorder information and protection information format conversion issues , on the basis of the COMTRADE Statute integrated both recorded wave data calculated failure last fault recorder recorded wave information to judge the behavior of protection devices action . Deficiencies on the efficiency and precision of the analysis algorithm for fault analysis system a new frequency monitoring and spectral analysis algorithms that can accurately calculate the fundamental frequency component of the signal , the harmonic and non-integer times harmonics amplitude, frequency and phase angle , the attenuation of the amplitude of the DC component , and the decay time constant . The formula derivation process start with a simple single- signal model to start , to get a single cosine signal amplitude , frequency and phase angle , and then extended to the general case of complex signal using cattle Rafah iterative solution . Algorithm high precision , from the initial sampling point , sampling frequency and order , real strong . This article combines various points of failure detection , fault phase selection and fault location method ; proposed the fault ranging new method based on the amount of power frequency , using the distributed parameter model and line parameters calculation . It only electrical double-ended three-phase decoupling derive the analytical expression of the fault location . The algorithm can calculate the double-ended system asynchronous angle and line parameters affected by the environment and change to overcome the drawbacks of traditional fault location , there is no pseudo-root algorithm is simple and practical , a small amount of calculation , without having to search and iterative robustness. The algorithm is also not subject to the type of fault , transition resistance factors . Finally, we verified through a typical line failure in a substation practicality and effectiveness of the system , the system can meet the scheduling staff , following the requirements of the security personnel and operating personnel , powerful analysis , calculated with high accuracy algorithm practicability .

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