Page 89 - SACE Tmax XT - Catalogue

PROTECTION TRIP UNITS 3/55

03

ABB Code ANSI Code Function Threshold Range Trip Time
RP 32R Reverse active power ± 10% The better of the two data:
± 10% or ± 100ms (for t11<5s) / ± 100ms (for t11 ≥ 5s)
D 68 Directional overcurrent ± 7% I ≤ 6 x In If t7 ≤ 200 ms : +/-20 ms
± 10% I ≥ 6 x In If 200ms < t7 ≤ 400 ms : 10%
If t7 > 400 ms : 40 ms
RQ 40/32R Loss of field or reverse reactive ± 10% The better of the two data:
power ± 10% or ± 100ms (for t24<5s) / ± 100ms (for t24 ≥ 5s)
OQ 320F Reactive overpower ± 10% The better of the two data:
± 10% or ± 100ms (for t27<5s) / ± 100ms (for t27 ≥ 5s)
OP 320F Active overpower ± 10% The better of the two data:
± 10% or ± 100ms (for t26<5s) / ± 100ms (for t26 ≥ 5s)
UP 32LF Active underpower ± 10% The better of the two data:
± 10% or ± 100ms (for t23<5s) / ± 100ms (for t23 ≥ 5s)
ROCOF 81R Rate of change of frequency 10% (20% when "0,4Hz/s" is The better of the two data:
set) ± 20% or ± 200ms
L (Motor Motor protection overload
Protection) According 60947-4-1
R 51LR Rotor blockage - Jam Ij = 2…10 x I1 tj = 1…10 s
51LR Rotor blockage - Stall Is = 1…10 x I1 ts = 2…10 s
U Phase lack and/or unbalance ± 10% The better of the two data:
± 10% or ± 40ms (for tu<5s) / ± 40ms (for tu ≥ 5s)
Uc 37 Undercurrent ± 10% The better of the two data:
± 10% or ± 40ms (for tuc<5s) / ± 40ms (for tuc ≥ 5s)
Protection with additional modules
SC 25 Synchrocheck (Live busbars) 10%
Synchrocheck
Synchrocheck (Live. Dead busbars) 10%
Gext 50GTD Earth fault ± 7% The better of the two data:
± 10% or ± 40ms
51G Earth fault ± 7% ± 15%
51G Earth fault
MDGF (2) Earth fault ± 7% The highest between 15% or 15ms
Rc 64 50N TD Residual current / - 20% ÷ 0% 140ms @ (max trip time)
87N Differential ground fault 950ms @ (max trip time)
(1) 2I Trip time with Vaux only:
- ≤ 3ms when the fault current exceeds18kA;
- ≤ 7ms (three-phase) or ≤9ms (single-phase) when the fault is greater than three times the 2I setting (I31);
- ≤ 15ms when the fault is lower than three times the 2I setting (I31)
(2) Available for XT7 only.
The tolerances above apply to trip units already powered by the main circuit with current flowing in at least two phases or an auxiliary power supply.
In all other cases the following tollerance values apply:

ABB Code Trip threshold Trip time
L Trip between 1.05 and 1.2 x I1 ± 20%
S ± 10% ± 20%
I ± 15% ≤ 60ms
G ± 10% 20% (60ms when t4=inst)
Other protection ± 15% ± 20%