Micom P631, Technical Manual

Page: 207 / 638

3.25 Current Transformer Supervision (Function Group CTS)
The current transformer supervision function can prevent unwanted tripping by
differential protection for faults in the CT's secondary circuit.
3.25.1 Hardware requirement
The CTS function can only be used if the processor board with DSP coprocessor is
fitted!
3.25.2 Enabling or Disabling the CTS Function
The current transformer supervision function can be disabled or enabled using
setting parameters. Moreover, enabling can be carried out separately for each
parameter subset.
0
CTS:
General enable USER
[ 031 085 ]
1
0: No
0
CTS:
Enable PSx
[ * ]
1
0: No
&
CTS:
Enabled
[ 036 080 ]
64Z5300B
PSU:
PS y active
[ ** ]
Parameter
set 1
set 2
set 3
set 4
CTS:
Enable PSx
001 118
001 119
001 120
001 121
PSU:
PS y active
036 090
036 091
036 092
036 093
y
1
2
3
4
*
1: Yes
**
1: Yes
Fig. 3-116: Enabling or disabling the CT Supervision
3.25.3 Blocking CTS
Current transformer supervision is blocked if one of the following conditions
applies:
●
Protection is disabled (off).
●
The CTS function is not enabled.
●
An external blocking signal is present.
●
The general trip signal is present.
●
Inrush stabilization or overfluxing restraint have operated.
3 Operation
P631
P631/EN M/R-11-C // P631-310-650 3-151