ABB RELION 620 Series Technical Manual page 689

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1MAC504801-IB E

620 series ANSI

Technical Manual

There is a validation functionality built-in function that checks the relationship adherence

so that if VVa x time 1 is set higher than VVa x time 2 or VVa x time 3, VVa x time 2 and VVa

x time 3 are set equal to the new VVa x time 1. If VVa x time 2 is set higher than VVa x time 3,

VVa x time 3 is set to the new VVa x time 2. If VVa x time 2 is set lower than VVa x time 1,

the entered VVa x time 2 is rejected. If VVa x time 3 is set lower than VVa x time 2, the

entered VVa x time 3 is rejected.

Duration measurement

The duration of each voltage phase corresponds to the period during which the measured

TRMS values remain above (swell) or below (dip, interruption) the corresponding limit.

Besides the three limit settings for the variation types dip and swell, there is also a specific

duration setting for each limit setting. For interruption, there is only one limit setting

common for the three duration settings. The maximum duration setting is common for all

variation types.

The duration measurement module measures the voltage variation duration of each phase

voltage separately when the Phase mode setting is "Single Phase". The phase variation

durations are independent. However, when the Phase mode setting is "Three Phase",

voltage variation may pick up only when all the monitored phases are active. An example

of variation duration when Phase mode is "Single Phase" can be seen in

voltage variation in the example is detected as an interruption for the phase B and a dip for

the phase A, and also the variation durations are interpreted as independent V_B and V_A

durations. In case of single-phase interruption, the DIPST output is active when either

PICKUP_A or PICKUP_B is active. The measured variation durations are the times

measured between the activation of the PICKUP_A or PICKUP_B outputs and

deactivation of the PICKUP_A or PICKUP_B outputs. When the Phase mode setting is

"Three Phase", the example case does not result in any activation.

Power quality measurement functions

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