With the increase of non-linear loads in the user side, the harmonic component of current when the system is in normal operation has increased, it is difficult to identify the fault line by the harmonic components accurately, so the precision of fifth harmonic analysis method using filters is decreased. In order to solve this problem, the phase-locked loop used in wind power integration was applied for fault line selection in small current grounding system, it obtained a very good effect in selecting the fault line by processing fault signal and comparing different lines wave phase and amplitude. Take the 10kV power cable with transmission mixed lines for instance, the small signal model of phase locked loop was established to lock the fifth harmonic waveform. And we use Simulink to verify that the results prove the correctness of the analysis.
Key words
Small current neutral grounding system /
Power cable with transmission /
Fifth harmonic /
Improved phase locked loop /
Fault line selection
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