REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04 REF542plus: Installation and Commissioning 64 / 80
ANSI Code Protection Function and the Setting Parameters Test Procedure
51 Motor start protection (adiabatic characteristic)
Ie = 0,3 ... 1,2 In (motor current)
Is = 1,00 ... 20 Ie (start value)
t = 70 ... 300.000 ms
I> = 0,6 ... 0,8 Is (motor start)
IEC 60255-3
51LR Blocking rotor (definite time characteristic)
Ie = 0,3 ... 1,2 In (motor current)
Is = 1,00 ... 20 Ie (start value)
t = 70 ... 300.000 ms
IEC 60255-3
66 Number of starts
n(warm) = 1 ...10 (number of warm starts)
n(cold) = 1 ...10 (number of cold starts)
t = 1.02 .. 7200 s
T (warm) = 20 ... 200 °C (temperature limit warm start)
21+79 Distance protection with autoreclosing
System earthing = high/low ohmic
ct – grounding = line side, bus bar side
with/without earth start
switching onto faults = normal, overreach zone, trip af-
ter start
Signal comparison overreach scheme time set = 30 ….
300.000 ms
U / I- Start characteristic:
I>, IE> and IF> = 0,05 ... 4 In
UF< = 0,05 ... 0,9 Un
Phase selection = cyclic/acyclic
Earth factor:
k = 0,00 ... 10,00
ϕ (k) = -60 ... 60°
3 Impedance- and 1 overreachstage:
R = 0,05 ... 120 Ω (secondary values)
X = 0,05 ... 120 Ω (secondary values)
t = 20 ... 10.000 ms
1 directional stage
Direction 0 ... 90 bzw.-45 ... 135°
t = 25 ... 10.000 ms
1 non directional stage
t = 25 ... 10.000 ms
2 shots AR with short/long time reclosing
IEC 60255-16
87 Differential protection
Transformer group = 0 ... 11
Transformer earthing = primary and or secondary side
Nom. current In on the primary/secondary side of the
transformer = 0.00 ... 100.000A (prim value)
Threshold current = 0,10 ... 0,50 In
Unbiased region limit = 0.50 … 5 In
Slightly biased region threshold = 0,20 ... 2 In
Slightly biased region limit = 1,00 ... 10,0 In
Slope = 0,40 ... 1,00
Trip with Id> = 5,00 ... 40 In
Blocking by 2
nd
harmonic = 0.10 … 0.30 In
Blocking by 5
th
harmonic = 0.10 … 0.30 In
IEC 60255-13
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