Technical Data; Analog Inputs; Measurements; Protection - ABB REF 542plus Technical Reference Manual

1MRS755859
6.
6.1.
6.1.1.
6.1.2.
Multifunction Protection and Switchbay Control
Unit
Technical Reference Manual

Technical data

Analog inputs

Measurements

The REF 542plus unit uses the same analog inputs both for measurements and
protections.
Table 6.1.1.-1 Measurements
Quantity
Phase current, earth current
Line voltage, phase voltage
Active, reactive energy
Active, reactive, apparent power
Cosφ
Frequency
To achieve highest accuracy the instrument transformers or the sensors must have
0.5 percent accuracy or better in the same range.

Protection

Table 6.1.2.-1 Protection functions and operation time
Protection functions
Operation time
Table 6.1.2.-2 Current and voltage transformer input values
Rated current l
n
Rated voltage U
n
Rated frequency f
n
Table 6.1.2.-3 Thermal load capacity
Current path
Voltage path
Table 6.1.2.-4 Consumption
Current path
Voltage path
Class Range
0.5 0.1-4I
0.5 0.2-1.5V
2 -
1 -
–1 - +1
1
0.02 40-75 Hz
Class 3
Class 3 or minimum ±15 ms
0.2 A or 1A or 5 A
100 V - 125 V
50 Hz or 60 Hz
250 I (peak value), dynamic 100 I
n
4 I continuous
n
2 U /√3 continuous
n
≤ 0.1 VA with I
n
≤ 0.25 VA with U
n
REF 542plus REF 542plus
n
n
for 1s,
n
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