ABB REF 542plus Technical Reference Manual page 42

REF 542plus REF 542plus
42
Multifunction Protection and Switchbay Control
Unit
Technical Reference Manual
51LR Locked rotor
(definite time
characteristic)
66 Number of starts
46 Unbalance load
37 Low load
Differential protection functions
87 Differential
87N Restricted earth
fault protection
(restricted
differential)
Frequency protection function
81 Frequency
protection
Frequency supervision
Frequency
supervision
Distance protection function
IMn = 0.200 ... 2.000 In (motor current)
Is = 1.000 ... 20.000 IMn (start value)
t = 40 ... 30 000 ms
n (warm) = 1 ...10 (number of warm starts)
n (cold) = 1 ...10 (number of cold starts)
t = 1.00 .. 7200.00 s
T (warm) = 20 ... 200 °C (warm start temp. thereshold)
Is = 0.05 ... 0.30 In (start value of the negative phase
sequence)
K = 0.5 ... 30.0
t Reset = 0 ... 2000 s
Timer decreasing rate = 0 ... 100%
Pn = 50 ... 1000 000 kW (primary values)
Minimal load P = 5 ... 100% Pn
Minimal current I = 2 ... 20 % In
Operation time = 1.0 ... 1000.0 s
Differential
Transformer group = 0 ... 11
Transformer earthing = primary and or secondary side
Primary nominal current = 10.00 ... 100 000.00 A (prim
value)
Secondary nominal current = 10.00 ... 100 000.00 A (prim
value)
Threshold current = 0.10 ... 0.50 Ir (p.u.)
Unbiased region limit = 0.50 ... 5.00 Ir (p.u.)
Slightly biased region threshold = 0.20 ... 2.00 Ir (p.u.)
Slightly biased region limit = 1.00 ... 10.0 Ir (p.u.)
Slope = 0.40 ... 1.00
Trip by Id> = 5.00 ... 40.00 In
Blocking by 2nd harmonic = 0.10 ... 0.30 In
Blocking by 5th harmonic = 0.10 ... 0.30 In
Reference nominal current = 1.00 ... 100000.00 A
Unbiased region threshold = 0.05 ... 0.50 Ir
Unbiased region limit = 0.01 ... 1.00 Ir
Slightly biased region slope = 0.01 ... 2.00
Slightly biased region limit = 0.01 ... 2.00 Ir
Heavily biased region slope = 0.10 ... 1.00
Relay operate angle = 60 ... 180°
t = 0.04 ... 100.00 s
Start value = 40.00 ... 75.00 Hz
Frequency gradient = 0.01 ... 1.00 Hz/s
t = 0.10 ... 30.00 s
U< = 0.10 ... 1.00 Un
Trip logic = freq. only / freq. AND freq. gradient / freq. OR
freq. gradient
Start value = 0.04 ... 5.00 Hz
Time = 1.00 ... 300.00 s
1MRS755859