Setup
- Location: HIOKI headquarters building, East side, 5th floor, 1-phase 3-wire, 200V distribution panel
- Measured period: From June 9, 2002 to August 9, 2002
Problem & Analysis
4 voltage dips caused by lightning were detected during measurement (different period than Case Study 4). The distribution panel (1-phase 3-wire) was affected by the voltage dip that occurred at the high voltage distribution network. The table below shows the residual voltage and period of each voltage dip. Voltage dips caused by lightning cannot be prevented by power distribution companies. Therefore, users should take appropriate countermeasures such as connecting a UPS to their PCs.
Event Voltage Fluctuation at the 2nd Voltage Dip
Voltage and Current Waveforms at the 2nd Voltage Dip
Source : Guidebook for Power Quality Measurement, HIOKI E.E. Corporation