REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04 REF542plus: Installation and Commissioning 65 / 80
ANSI Code Protection Function and the Setting Parameters Test Procedure
46 Unbalance load
Is = 0,05 ... 0,3 In (start value of the negative phase
sequence)
K = 2 ... 30
tReset = 0 ... 200 s
Timer decreasing rate = 0 … 100%
IEC 60255-3
32 Directional power
Nominal real power Pn = 1 ... 1000.000 kW (primary
values)
Max.reverse load P> = 1 ... 50 % Pn
t = 1,02 ... 1000 s
IEC 60255-12
37 Low load
Nominal real power Pn = 50 ... 1000.000 kW (primary
values)
Minimal load P< = 5 ... 100% Pn
Minimal current I< = 2 ... 20 % In
t = 1 ... 1000 s
IEC 60255-12
81 Frequency monitoring
Start at ∆f = 0,04 ... 5 Hz
t = 1,02 ... 300 s
IEC 60255-3
25 Synchronism check
∆ U = 0,02 ... 0,4 Un
t = 0,52 ... 1000 s
∆ ϕ = 5 ... 50°
IEC 60255-12
Fault recorder
Recording time = 1000 ... 5000 ms
Pre fault time: = 100 ... 2000 ms
Post fault setting = 100 ... 4900 ms
Max. 5 records
IEC 60255-24
55 Power factor controller
Power factor = 0,70 ... 1,00
QC0 = 1,000 ... 20000,000 kVAr
Series of banks = 1:1:1:1 ... 1:2:4:8
Number of banks : 1 ... 4
Insensitivity = 105 ... 200 % QC0
Threshold = 0 ... 100 % QC0
Switching program = sequential/circuit switching
IEC 60255-12
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