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
Содержание RET620
Страница 1: ...Relion 620 series Transformer Protection and Control RET620 Product Guide ...
Страница 62: ...62 ...