Positive current traveling-wave principle component cluster analysis-based closing fault identification method
A technology of forward current and cluster analysis, which is applied in the direction of fault location, electrical components, emergency protection circuit devices, etc., and can solve the problems of insufficient traveling wave identification methods, etc.
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[0026] Example 1: Such as figure 1 The 500kV transmission line simulation system model shown, the protected line is MN, and the line length is L PM = 150km, L MN = 150km, L NQ =220km, the sampling rate is 1MHz. Suppose the A-phase circuit breaker at the N end of the protected line is in the open state, and the A-phase circuit breaker at the M end of the protected line will perform the closing operation. It is assumed that there is no fault on the line MN and a phase A ground fault occurs 149km from the M end. , The transition resistance is 10Ω, and the initial phase angle is 60°.
[0027] Collect the three-phase current traveling wave and the three-phase voltage traveling wave generated by the measuring terminal M of the circuit closing. The three-phase voltage and three-phase current traveling wave are transformed into phase-to-mode using equations (1) and (2) to extract three line-mode voltage components Δu α , Δu β And Δu γ And current component Δi α , Δi β And Δi γ .
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Example Embodiment
[0033] Example 2: Such as figure 1 The 500kV transmission line simulation system model shown, the protected line is MN, and the line length is L PM = 150km, L MN = 150km, L NQ =220km, the sampling rate is 1MHz. Suppose the B-phase circuit breaker at the N end of the protected line is in the open state, and the B-phase circuit breaker at the M end of the protected line will perform the closing operation. It is assumed that the line MN has no fault and the B-phase ground fault occurs 60km from the M end. , The transition resistance is 50Ω, and the initial phase angle is 60°.
[0034] Collect the three-phase current traveling wave and the three-phase voltage traveling wave generated by the measuring terminal M of the circuit closing. The three-phase voltage and three-phase current traveling wave are transformed into phase-to-mode using equations (1) and (2) to extract three line-mode voltage components Δu α , Δu β And Δu γ And current component Δi α , Δi β And Δi γ .
[0035] S...
Example Embodiment
[0040] Example 3: Such as figure 1 The 500kV transmission line simulation system model shown, the protected line is MN, and the line length is L PM = 150km, L MN = 150km, L NQ =220km, the sampling rate is 1MHz. Suppose that the A-phase circuit breaker at the N end of the protected line is in the open state, and the A-phase circuit breaker at the M end of the protected line will perform the closing operation. It is assumed that the line MN has no fault and the C-phase ground fault occurs 90km from the M end. , The transition resistance is 10Ω, and the initial phase angle is 30°.
[0041] Collect the three-phase current traveling wave and the three-phase voltage traveling wave generated by the measuring terminal M of the circuit closing. The three-phase voltage and three-phase current traveling wave are transformed into phase-to-mode using equations (1) and (2) to extract three line-mode voltage components Δu α , Δu β And Δu γ And current component Δi α , Δi β And Δi γ .
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