| The on-line monitoring of partial discharge in large-scale generator insulation has a high requirement on sensitivity and anti-interference of sensor. This paper has concluded the characteristic of PD in generator stator through examining and analyzing waveform in time domain and spectrum characteristic of PD pulse signal in generator stator; summarized the influence that back wave brings to PD signal through simulating wave procedure of PD signal; Besides, simulated waveform in time domain and spectrum with different length sealing bus, and developed a non-contact generator stator sensor based on the former characteristic.After developed sensor successfully, realized the discrimination of direction of conducting electromagnetic pulse through comparing non-contact electric field sensor and non-contact magnetic field sensor synthetically and utilized this characteristic to eliminate the electromagnetic pulse interference which comes from the exterior generator. Then carried the HV experiment utilizing simulated generator stator bar and the result show that direction discrimination of sensor is feasible. |
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