VAMP 265 - 4.1. Measurement Accuracy

Technical description
4 Measurement functions
4.1 Measurement accuracy
VM265.EN011
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4.1. Measurement accuracy
Phase current inputs I
L1
, I
L2
, I
L3,
I’
L1
, I’
L2
, I’
L3
Measuring range
25mA – 250 A (5A)
5mA – 50 A (1A)
Inaccuracy I  7.5 A
0.5 % of value or 15 mA
I > 7.5 A
3 % of value
The rated input I
N
is 5A or 1A. It is specified in the order code
of the relay.
The specified frequency range is 45 Hz – 65 Hz.
Residual current inputs I
01
, I
02
Measuring range
0 – 5 xI
N
Inaccuracy I  1.5 xI
n
0.3 % of value or 0.2 % of I
N
I > 1.5 xI
n
3 % of value
The specified frequency range is 45 Hz – 65 Hz.
The rated input I
n
is 5A or 1A. This must be specified when
ordering the relay.
Frequency
Measuring range
16 Hz – 75 Hz
Inaccuracy
10 mHz
In VAMP 265 frequency is measured from current signals.
THD and harmonics
Inaccuracy I 0.1 PU
2 % units
Update rate
Once a second
The specified frequency range is 45 Hz – 65 Hz.