Section 4 1MAC309294-MB F
Protection functions
204 RER620
Technical Manual
27 prevents sensitive equipment from running under conditions that could cause
overheating and thus shorten their life time expectancy. In many cases, 27 is a useful
function in circuits for local or remote automation processes in the power system.
4.3.2.7 Signals
Table 211: 27-1/2 Input signals
Table 212: 27-1/2 Output signals
4.3.2.8 Settings
Table 213: 27-1/2 Group settings
Name Type Default Description
V_A_AB SIGNAL 0 Phase to ground voltage A or phase to phase voltage AB
V_B_BC SIGNAL 0 Phase to ground voltage B or phase to phase voltage BC
V_C_CA SIGNAL 0 Phase to ground voltage C or phase to phase voltage CA
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
Name Type Description
OPERATE BOOLEAN Trip
OPR_A_AB BOOLEAN Trip output of Phase A (or Phase AB)
OPR_B_BC BOOLEAN Trip output of Phase B (or Phase BC)
OPR_C_CA BOOLEAN Trip output of Phase C (or Phase CA)
START BOOLEAN Pickup
ST_A_AB BOOLEAN Pickup output of Phase A (or Phase AB)
ST_B_BC BOOLEAN Pickup output of Phase B (or Phase BC)
ST_C_CA BOOLEAN Pickup output of Phase C (or Phase CA)
Parameter Values (Range) Unit Step Default Description
Pickup value 0.05...1.20 xVn 0.01 0.90 Pickup value
Time multiplier 0.05...15.00 0.05 1.00 Time multiplier in IEC/ANSI IDMT curves
Trip delay time 60...300000 ms 10 60 Trip delay time
Operating curve type 5=ANSI DT
15=IEC DT
21=Inv. Curve A
22=Inv. Curve B
23=Programmable
5=ANSI DT Selection of time delay curve type
Type of reset curve 1=Immediate
2=Def time reset
-1=DT Lin decr rst
1=Immediate Selection of reset curve type
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