ABB REF 542plus Operator's Manual page 76

REF 542plus REF 542plus
76
Multifunction Protection and Switchgear Control Unit
Operator's manual
The Rogowsky coil can be used for current sensing. The correct ratio of the
Rogowsky coil is selected with the Operating Tool. The resistive divider can be used
for voltage sensing. The ratio is selected with the Operating Tool. The physical input
on the unit is the same both for voltage and current sensing, the selection is done via
the Operating Tool. Therefore, it is possible for example to use 6 Rogowsky coils, 6
voltage dividers, or 3 Rogowsky coils and 3 voltage dividers.
To detect which analog input module is present inside the unit, look in the
identification label stick on the unit itself, or on the HMI service page under the HW
identification submenu.
Fig. 19.1.-1 Connector for sensors analog input module
The analog input for sensor is the same both for voltage and current sensing. To find
out whether an input is for current or for voltage, the Operating Tool is needed. X81
corresponds to analog input 1 (sensor 1 in the Operating Tool), X82 to analog input
2 (sensor 2 in the Operating Tool) and so forth.
Fig. 19.1.-2 Connector for conventional instrument transformers
The connector for conventional instrument transformer has twenty-four pins. The
following Table 19.1.-1 defines which input is connected to what:
Table 19.1.-1 Connection table for conventional instrument transformers
VT (100-110/)
1 T5/B
2 T3/B
3 T1/B
4 T8/B
5 T5/R
6 T3/R
7
8 T8/R
9
10
11 T1/R
CT (1-5A) CT (0.2A)
T5/2
T3/2
T1/2
T8/2
T5/1
T3/3
T1/3
T8/3
T5/3
T3/1
T1/1
1MRS755869
A051450
A051451
T8/A
T8/B