Line voltage dip

The following example shows how to set line voltage dips (short two phases: 70% residual voltage).

 

STEP	0	1	2	3
ACVOLT [V] U phase AC voltage	116.6	91.6	116.6	116.6
RAMP (ACVOLT) U phase voltage ramp	OFF	OFF	ON	OFF
ACV V[V] V phase AC voltage	116.6	116.6	116.6	116.6
RAMP (ACV V) V phase voltage ramp	OFF	OFF	ON	OFF
ACV W [V] W phase AC voltage	116.6	91.6	116.6	116.6
RAMP (ACV W) W phase voltage ramp	OFF	OFF	ON	OFF
TIME [ms] Step time	100	100	100	100
S.PHASE [deg] Starting phase angle	FREE	FREE	FREE	FREE
E.PHASE [deg] Ending phase angle	FREE	FREE	FREE	FREE
U PHA.OFFS [deg] U phase offset	0	350	0	OFF
RAMP (U PHA.OFFS) U phase ramp	OFF	OFF	LAG	OFF
U-V PHAS [deg] U-V phase difference	120	OFF	OFF	OFF
RAMP (U-V PHAS) V phase ramp	OFF	--	--	---
U-W PHAS [deg] U-W phase difference	240	250	240	OFF
RAMP (U-W PHAS) W phase ramp	OFF	OFF	LEAD	---
PHAS. CNG sudden phase change	OFF	OFF	OFF	OFF

In step 1, we will suddenly change phases, and in step 2, we will sweep phases. For sudden phase changes, we normally do not use the U phase offset, but because we will use both sudden phase change and phase sweep in this example, we will set the sudden phase change using the U phase offset.

In step 1, we set the U-W line voltage to 70%.

We set the U and W phase voltages to 91.6 V (ramp off), the U phase (U phase offset) to 350° (360° - 10°), and the W phase (U-W phase difference) to 250° (240° + 10°). Because these will be sudden changes, the U and W phase ramp settings are set to off.

In step 2, the U-W line voltage is varied from 70% to 100% over the duration of the step (1 second).

We set the U and W phase voltages to 116.6 V and the voltage ramp to on.

To sweep the U phase clockwise to 0°, we set the U phase (U phase offset) to 0° and set the ramp to LAG.

To sweep the W phase counterclockwise to 240°, we set the W phase (U-W phase difference) to 240° and set the ramp to LEAD.

 

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