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1736/1738

Users Manual

Supply Voltage Swells

On single-phase systems, a swell begins when the voltage

rises above the swell threshold, and ends when the

voltage is equal to or below the swell threshold minus the

hysteresis voltage. See Figure 8.

On polyphase systems, a swell begins when the voltage of

one or more channels is above the swell threshold and

ends when the voltage on all measured channels is equal

to or below the swell threshold minus the hysteresis

voltage.

hcf071.eps

Figure 8. Characteristics of a Voltage Swell

On single-phase systems, a voltage dip begins when the

voltage falls below the dip threshold, and ends when the

voltage is equal to or above the dip threshold plus the

hysteresis voltage. See Figure 9.

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Figure 9. Characteristics of a Voltage Dip

On polyphase systems, a dip begins when the voltage of

one or more channels is below the dip threshold and ends

when the voltage on all measured channels is equal to or

above the dip threshold plus the hysteresis voltage.

Threshold

Hysteresis

Reference Voltage

Time

Magnitude

Duration