ABB 216GD61A HESG324436R3/A generator protection digital control unit
Table 20 Breaker pole discrepancy protection (51/62PD)Setting range
Time delay
Discrepancy factor
0.1 IN to 2.0 IN in steps of 0.1 IN, default 0.2 IN
100 ms to 10000 ms in steps of 100 ms, default 1500 ms
0.01* Imax to 0.99 * Imax in steps of 0.01 * Imax, default 0.6 * Imax
For feeders with single phase tripping and autoreclosure, the time setting for the breaker pole discrepancy
protection must be greater than the reclosure time. The discrepancy factor is the maximum permissible
difference between the amplitudes of two phases.
Table 21 Current release criteria (51)
Setting range (per feeder) 0.1 IN to 4.0 IN in steps of 0.1 IN, default 0.7 IN
If the current release criteria is not activated, the tripping command (“21110_TRIP”) is given independent
of current (standard setting).
The current release criteria only allows the trip of a circuit breaker if the feeder current value is above the
setting value of the enabling current. This value can be individually selected for each bay.
Table 22 Voltage release criteria (27/59)
U< Setting range (per feeder)
U0> Setting range (per feeder)
0.2 UN to 1.0 UN in steps of 0.05 UN, default 0.7 UN
0.1 UN to 1.0 UN in steps of 0.05 UN, default 0.2 UN
If the voltage release criteria is not activated the tripping command (“21110_TRIP”) is given independent
of voltage (standard setting).
The voltage release criteria is used as an additional criterion for busbar protection (as well as for the other
station protection functions) and operates per zone. It can be used as U< or U0> or in combination.
Table 23 Check zone criterion (87CZ)
Min. fault current pick-up setting (Ikmin) 500 to 6000 A in steps of 100 A
Stabilizing factor (k) 0.0 to 0.90 in steps of 0.05
CT ratio per feeder Feeder 50 to 10 000/1 A,
50 to 10 000/5 A, adjustable via HMI500
The check zone is used as an additional release criterion for busbar protection and operates zone-independent.
For delaying pick-up or reset or for integrating 1 binary signal
Provision for inverting the input
4 independent parameter sets
Settings:
Pick-up or reset time 0 to 300 s in steps of 0.01 s
Integration yes/no

Table 25 Logic
Bay level functions for Back-up/Main 2 REB500sys
Logic for 4 binary inputs with the following 3 configurations:
1. OR gate
2. AND gate
3. Bistable flip-flop with 2 set and 2 reset inputs (both OR gates), resetting takes priority
4 independent parameter sets.
All configurations have an additional blocking input.
Provision for inverting all inputs.
Table 26 Definite time over- and undercurrent protection (51)
Over- and undercurrent detection
Single or three-phase measurement with detection of the highest, respectively lowest phase current
2nd harmonic restraint for high inrush currents
4 independent parameter sets
Settings:
Pick-up current 0.2 to 20 IN in steps of 0.01 IN
Delay 0.02 to 60 s in steps of 0.01 s
Accuracy of the pick-up setting (at fN) ±5%
Reset ratio
overcurrent
undercurrent
>94% (for max. function)
<106% (for min. function)
Max. operating time without intentional delay 60 ms
Inrush restraint
pick-up setting
reset ratio
optional
0.1 I2h/I1h
0.8
Table 27 Inverse time overcurrent protection (51)
Single or three-phase measurement with detection of the highest phase current
4 independent parameter sets
Inverse time characteristic
(acc. to B.S. 142, IEC 60255-3 with extended
setting range)
normal inverse
very inverse
extremely inverse
long time inverse
t = k1 / ((I/IB)
C - 1)
c = 0.02
c = 1
c = 2
c = 1
or RXIDG characteristic t = 5.8 - 1.35 · In (I/IB)
Settings:
Number of phases 1 or 3
Base current IB 0.04 to 2.5 IN in steps of 0.01 IN
Pick-up current Istart 1 to 4 IB in steps of 0.01 IB
Min. time setting tmin 0 to 10 s in steps of 0.1 s
k1 setting 0.01 to 200 s in steps of 0.01 s
Accuracy classes for the operating time
according to B.S. 142, IEC 60255-3
RXIDG characteristic
E 5.0
±4% (1 - I/80 IB)
Reset ratio 95%