Veesta World V-RTU2000 Series Technical Information page 64

V-RTU2000 Series
Veesta - Remote Terminal Unit
Technical Specification Manual
11.2.2.2 Fault-Alarm-Curve
11.2.2.3 Set-point Group
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Chapter 11 - Universal Intelligent AC Power Meter Unit
The required Fault-Alarm-Curve is established by programming a
Pickup Current and a Curve Multiplier. The Pickup Current is the
threshold current at which the fault detection starts timing, range from
0.05 to 16.00 CT. The Curve Multiplier allows shifting of the
programmed base curve in the vertical time direction, range from
0.00 to 100.00. The formula is:
T = M * Tfbc (at I/Ipu)
Where
T = Fault Alarm Time (ms)
M = Curve Multiplier
Tfbc = Fault Base Time (ms) at I/Ipu
I = Input Current
Ipu = Pickup Current
In VR-2749 ACPM Model, the set-points (Ip-pu, Mp) are used for all
three phase time over-current detection, and the set-points (Ig-pu,
Mg) are used for ground time over-current detection only. Sixteen
user programmable set-point groups (Ip-pu, Mp, Ig-pu, Mg) (G-00 to
G-15) can be stored in VR-2749. (In other word, there are 16 phase
fault-alarm-curves
communications, host can select the active set-point group remotely,
and the active group no, the active Ip-pu, the active Mp, the active
Ig-pu, and the active Mg value can be read-back.
and 16 ground fault-alarm-curves.)
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