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Power, Energy, Environment Service, Maintenance Measure transient overvoltage waveforms Use the PW3198 Power Quality Analyzer to properly detect transient overvoltage waveforms. ■Highlights A transient overvoltage is generated by a lightning strike, a contact fault, a melting circuit breaker, or a relay that causes a voltage change. High voltages occur especially near the source where the power supply is damaged and reset operations are triggered. High-voltage system Transformer Low-Voltage Circuit Electric Electric equipment ・・・ equipment POWER QUALITY ANALYZER PW3198 Max Min Transient p-p value Example of transient overvoltage Example of transient overvoltage waveforms Analysis example of above transient overvoltage waveform 1. Occurred in all 3 phases (R-S, S-T and T-R) simultaneously 2. Occurred twice in 1 cycle of the commercial waveform, and the interval between two events is 820 µs 3. The level is between 120 V to 260 V peak-to-peak 4. The frequency is between 10 to 30 kHz Products used ・POWER QUALITY ANALYZER PW3198 ・POWER QUALITY ANALYZER PW3198-90 (PC Application software 9624-50 included) Information valid as of March 2012. Specifications are subject to change and revision without notice. K0041-E00 March 2012