Partial discharges measurement during under-damped steep-fronted overvoltages

Inverter-fed drives have become essential in most industrial processes nowadays to control the speed of rotation of electric motors. Unfortunately, the insulation of these electric motors show unexpected failures due to the appearance of partial discharges (PD). These type of discharges undermine th...

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Bibliographic Details
Main Authors: Martinez-Tarifa, Juan Manuel, Robles, Guillermo
Format: Conference Proceeding
Language:English
Subjects:
Antenna measurements
electric motors
Insulation
inverter-fed drives
Partial discharges
pulse-width modulation
switching
Time-frequency analysis
Transmitting antennas
Voltage measurement
Windings
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Summary:Inverter-fed drives have become essential in most industrial processes nowadays to control the speed of rotation of electric motors. Unfortunately, the insulation of these electric motors show unexpected failures due to the appearance of partial discharges (PD). These type of discharges undermine the insulation along time creating weak spots than can cause total breakdowns. Thus, the detection of partial discharges is a challenge that must be faced by electric motor manufacturers and users. The problem of detection is intensified because the voltage supplied to the motors is based on steep-fronted pulses and PD are also very narrow pulses so it is quite complex to separate them from the electrical interferences created by the train of square pulses. In this paper, two different radio-frequency (RF) sensors will be used to detect PD in an insulation system subjected to square voltages with low rise-times. The response will be analyzed in the UHF range to select the best option for the detection of those hazardous under-damped pulses.
ISSN:2642-2077
DOI:10.1109/I2MTC43012.2020.9129294