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- This paper is to investigate how partial discharge pulse signal can flow in 6.6kV motor stator windings. Pulse propagation is experimentally analyzed in stator windings using a variety of frequency-domain techniques. The experiments were performed on two stator windings in the laboratory. Spectrum analyzer(9kHz to 3GHz) with tracking generator(100kHz to 3GHz) was used. Sweep time of the tracking generator was 100ms. The frequency spectrum of the response signal was detected by active FET probe(1GHz). The active FET probe has a flat amplitude response up to 1GHz without high frequency attenuation. The stator winding acts as a low-pass filter below 600kHz, the high-frequency components being highly declined. The resonance peaks show about 1.1MHz and 2MHz in low frequency of No. 1 and No. 2 stator windings, respectively. This low-frequency range indicates that attenuation is low. The peaks of partial discharge magnitude show about 900kHz, 1.6MHz in No. 1 stator winding and about 800kHz, 1.4MHz in No. 2 stator winding.Keyword -