ABB REF542plus Operator's Manual page 70

REF542plus
70
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. 18.1.-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. 18.1.-2 Connector for conventional instrument transformers
The connector for conventional instrument transformer has twenty-four pins.
The following Table 18.1.-1 defines which input is connected to what:
Table 18.1.-1 Connection table for conven tional 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
CT (1-5A) CT (0.2A)
T5/2
T3/2
T1/2
T8/2
T5/1
T3/3
T1/3
T8/3
1MRS755869
A051450
A051451
T8/A
T8/B