EHV transmission line fault transient noise charac

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EHV transmission line fault transient noise characteristics of

Of the calculation, the phase fault , the parameters often used to solve the fault phase current and voltage pairs. According to this feature of distance protection , the following fault phase power to the noise characteristics of the analysis and discussion . In principle, the fault phase noise power statistical characteristics of the various phases through the transient fault to determine the statistical calculations . But this will involve more fault types , calculation is very complicated . Theoretical analysis and simulation results show that , if the system of positive sequence and negative sequence impedance is equal , no matter what type of phase fault , fault phase current and voltage components of the steady state and transient components are identical. Therefore, the noise power from the protection of the relevant characteristics of the actual can be attributed to single-phase fault and only two basic types of three-phase fault . Fault phase current and voltage of the noise statistical properties , see the preceding three-phase fault on the analysis of noise characteristics , the specific content here omitted. 3 Conclusion In this paper, digital simulation method of transmission line fault transient noise statistics were studied. Simulation results show that . When the line fails, current, voltage, significantly different noise characteristics and noise characteristics are directly related with the fault type . In terms of distance protection , due to phase fault , the fault phase current and voltage from phase noise characteristics of the fault type of impact, therefore, the relevant characteristics of the noise power can be attributed to the single-phase fault and two basic types of three-phase fault . Given the different type of fault conditions, significant difference between the noise , so filtering algorithm for microprocessor-based protection and protection setting should be selected according to different fault types , respectively ,[link widoczny dla zalogowanych], to optimize protection performance.