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Partial discharge
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=== Partial discharge measurement system === A partial discharge measurement system basically consists of: * a cable or other object being tested * a coupling capacitor of low inductance design * a high-voltage supply with low background noise * high-voltage connections * a high voltage filter to reduce background noise from the power supply * a partial discharge detector * PC software for analysis A partial discharge detection system for in-service, energized electric power equipment: * a cable, transformer, or any MV/HV power equipment * Ultra High Frequency Sensor (UHF) Detection Bandwidth 300 MHz-1.5 GHz * High Frequency Current Transformer (HFCT) Bandwidth 500 kHz-50 MHz * [[Ultrasonic transducer|Ultrasonic microphone]] with center frequency 40 kHz * Acoustic Contact Sensor with detection bandwidth 20 kHz - 300 kHz * TEV sensor or coupling capacitor 3 MHz-100 MHz * Phase-resolved analysis system to compare pulse timing to AC frequency
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