ABB RET620 - Supervision Functions; Current Circuit Supervision (CCRDIF); Current Circuit Supervision (CCRDIF) Main Settings; CT Secondary Circuit Supervision (CTSRCTF)

Supervision functions
Table 82. Current circuit supervision (CCRDIF)
Characteristic Value
Operate time
1)
< 30 ms
1) Including the delay of the output contact
Table 83. Current circuit supervision (CCRDIF) main settings
Parameter Function Value (Range) Step
Start value CCRDIF 0.05...0.20 x I
n
0.01
Maximum operate current CCRDIF 1.00...5.00 x I
n
0.01
Table 84. CT secondary circuit supervision (CTSRCTF)
Characteristic Value
Operate time
1)
< 30 ms
1) Including the delay of the output contact
Table 85. CT secondary circuit supervision (CTSRCTF) main settings
Parameter
Function Value (Range) Step
Min operate current CTSRCTF 0.01...0.50 xIn 0.01
Max operate current CTSRCTF 1.00...5.00 xIn 0.01
Max Ng Seq current CTSRCTF 0.01...1.00 xIn 0.01
Table 86. Fuse failure supervision (SEQRFUF)
Characteristic
Value
Operate time
1)
NPS function U
Fault
= 1.1 x set Neg Seq voltage
Lev
< 33 ms
U
Fault
= 5.0 x set Neg Seq voltage
Lev
< 18 ms
Delta function ΔU = 1.1 x set Voltage change rate < 30 ms
ΔU = 2.0 x set Voltage change rate < 24 ms
1) Includes the delay of the signal output contact, f
n
= 50 Hz, fault voltage with nominal frequency injected from random phase angle, results based on statistical distribution of 1000
measurements
Transformer Protection and Control 1MRS757846 A
RET620
Product version: 2.0
ABB 47