Supervision functions
Table 35. CT supervision for high-impedance protection scheme (HZCCRDIF)
Characteristic
Value
Operation accuracy
Depending on the frequency of the current measured: fn
±2 Hz
±1.5% of the set value or ±0.002 x In
Reset time
< 40 ms
Reset ratio
Typical 0.96
Retardation time
< 35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Table 36. CT supervision for high-impedance protection scheme (HZCCRDIF) main settings
Parameter
Values (Range)
Unit
Step
Default
Description
Start value
1.0...100.0
%In
0.1
10.0
Start value,
percentage of the
nominal current
Alarm delay time
100...300000
ms
10
3000
Alarm delay time
Alarm output mode
1=Non-latched
3=Lockout
3=Lockout
Select the operation
mode for alarm output
Busbar and Multipurpose Differential Protection and Control
1MRS757467 B
REB611
Product version: 1.0
ABB
25
Summary of Contents for Relion 611 series REB611
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