Напон дип узрокована Лигхтнинг Стрикес - у посуду (Хиоки)

Намештаљка

  1. ХИОКИ централна зграда, 3-phase 4-wire, 6.6kV receptacle, Secondary of PT
  2. 1 year from June 2003 to May 2004

Проблем & Анализа

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 5th to 7th, 2003). The residual voltage is very low and a long voltage dip period is detected on CH3 (T-R phase) as 4.708kV for 109ms.

Квалитет снага студија случаја
Напон флуктуације
Classification in EN50160 mode (Simultaneous events on 3 phases are counted as one)
Classification in EN50160 mode (Simultaneous events on 3 phases are counted as one)

 

Voltage Dip Evaluation using the ITIC Curve (plotted for each phase separately)
Voltage Dip Evaluation using the ITIC Curve (plotted for each phase separately)

 

Event Voltage Fluctuation of the Lowest Residual Voltage and the Shortest Period Voltage Dip
Event Voltage Fluctuation of the Lowest Residual Voltage and the Shortest Period Voltage Dip

 

Path of a Voltage Dip
Path of a Voltage Dip

The instantaneous high voltage is generated by a lightning strike which shorts the distribution cable and tower. Онда, the fault current flows and the voltage drops. To remove this fault, the circuit breaker trips, but the voltage drops continues until that time (approx. 0.07s to 2s). This represents an instantaneous voltage drop (voltage dip) caused by a lightning strike.

Извор : Водич за мерење квалитета напајања, Хиоки Е.Е. Корпорација

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