ABB REF 542plus Technical Reference Manual

51LR Locked rotor
(definite time
characteristic)
IMn = 0.200 ... 2.000 In (motor current)
Is = 1.000 ... 20.000 IMn (start value)
t = 40 ... 30 000 ms
66 Number of starts 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)
46 Unbalance load 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%
37 Low load 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 protection functions
87 Differential 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
87N Restricted earth
fault protection
(restricted
differential)
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
Frequency protection function
81 Frequency
protection
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
Frequency supervision
Frequency
supervision
Start value = 0.04 ... 5.00 Hz
Time = 1.00 ... 300.00 s
Distance protection function
42
REF 542plusREF 542plus
Multifunction Protection and Switchbay Control
Unit
Technical Reference Manual
1MRS755859

ABB REF 542plus Specifications

General

Brand	ABB
Model	REF 542plus
Category	Control Unit
Language	English