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Extended metering functions
The metering function PLUS is used to implement extended protective functions beyond the functionality of the trip units.
1)
ANSI definition:
Ratio of the largest difference between the phases and the average of all 3 phases.
If one of these parameters exceeds or falls below its default settings, the trip unit is tripped after the adjusted delay via the c.
The parameters can be adjusted via:
- TD400 and the software "powerconfig"
- the COM modules with a PC with the software “powerconfig” installed (page 29-2)
- the graphical display (ETU776)
Parameter Range Delay
Undervoltage 100 - 1100 V 0 - 15 sec.
Overvoltage 200 - 1200 V 0 - 15 sec.
Active power in normal direction 1 - 12000 kW 0 - 15 sec.
Active power in reverse direction 1 - 12000 kW 0 - 15 sec.
Overfrequency 40 - 70 Hz 0 - 15 sec.
Underfrequency 40 - 70 Hz 0 - 15 sec.
Phase current unbalance
1)
5 - 50% 0 - 15 sec.
Phase voltage unbalance
1)
5 - 50% 0 - 15 sec.
Phase rotation
Pickup THD current 3 - 50% 5 - 15 sec.
Pickup THD voltage 3 - 50% 5 - 15 sec.
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