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CASE STUDY 5
Voltage Dip (Instantaneous Voltage Drop) - at Receptacle
Environment:
Problem and Analysis:
Target:
HIOKI headquarters building,
3-phase 4-wire, 6.6kV receptacle, Secondary side of PT
While measuring for 1 year at the receptacle of a 3-phase 6.6kV circuit, a voltage dip is detected
only during a lightning strike. This voltage dip occurred 6 times in 3 consecutive days (August 5 to
7, 2003). The residual voltage is very low and a long period is detected on CH3 (T-R phase) as
4.708kV for 109ms.
1 year from June 2003 to May 2004Measured period:
Voltage Fluctuation
Classification in EN50160 mode
(Simultaneous events on 3 phases are counted as one.)
Voltage Dip Evaluation by ITIC Curve
(plotted for each phase separately)
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