ABB REF542plus User Manual

69
Table 18.-1 Connectors (Continued)
Connector Meaning
X74 Time synch input
X75 HSTS Input
X76 HSTS Input
X77 HSTS Output
X80 Analog inputs
X81 Sensor 1
X82 Sensor 2
X83 Sensor 3
X84 Sensor 4
X85 Sensor 5
X86 Sensor 6
X87 Sensor 7
X88 Sensor 8
18.1. Analog Inputs
REF542plus can have a maximum of 8 analog input channels. These inputs
are divided into three measurement groups:
*
Measurement Group 1: channel 1, channel 2, channel 3
*
Measurement Group 2: channel 4, channel 5, channel 6
*
Measurement Group 3: channel 7, channel 8
Group 1 and group 2 have to be homogeneous, which means they can
measure 3 currents or 3 voltages. For example, measurements of 1 current
and 2 voltages are not allowed.
Group 3 can get any type of signals: 2 currents, 2 voltages, 1 current and 1
voltage and so on. Group 1 and group 2 can be used for homogeneous current
or voltage measurements both from instrument transformers and non-
conventional sensors. Group 3 can be used in a heterogeneous way.
Channel 7 and 8 in group 3 can be used for earth-fault current with CT type
input; residual voltage, or for the synchrocheck function with VT or sensor
type input.
The input CT 0.2A is commonly used with a toroidal transformer for
sensitive earth-fault current measurement.
Instrument current transformers can have secondary windings ratio /1 A or /5
A. The primary nominal current (for example 400 A) is selected with the
Operating Tool. The secondary current (for example /5 A) is automatically
selected connecting the right wire to the analog input module.
1MRS755869
Multifunction Protection and Switchgear Control
Unit
Operator's manual
REF542plus

ABB REF542plus Specifications

General

Brand	ABB
Model	REF542plus
Category	Control Unit
Language	English