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1MRS750881-MUM
Remote Monitoring and Control Unit
Technical Reference Manual
REC 523
The correction parameters/factors are calculated as follows:
Current transformers
Voltage transformers
Rogowski coil
Voltage divider
5.3.3.
Calculated analogue channels
REC 523 includes virtual channels to obtain phase-to-phase voltages, residual
voltage and neutral current when sensors are used. Current sensors and voltage
dividers are connected to the feeder terminal via coaxial cables. Therefore a phase-
to-phase voltage connection, an open-delta connection of phase voltages or a
residual connection of phase currents cannot be made. Both the amplitude and the
phase angle are calculated for the virtual channels.
The virtual channel voltages and currents are numerically derived from the phase
voltages and phase currents according to Table 5.3.3-1. Though primarily meant to
be used with sensors, the calculated analogue channels can also be used with
conventional current and voltage transformers.
The virtual channels are numbered according to the priority numbers in the Table
5.3.3-1. The virtual channel used first is numbered as 11 and the following as 12, 13
and so on. For example, U
0s
is numbered as 11 and U
12s
as 12, if these virtual
channels are selected for use.
Amplitude error at current I
n
(e = error in per cent)
Amplitude correction factor 1
= 1 / (1+ e/100)
Amplitude error at current 0.01 x I
n
(e = error in per cent)
Amplitude correction factor 2
= 1 / (1+ e/100)
Phase displacement error at current I
n
(e = error in degrees)
Phase displacement error 1 = - e
Phase displacement error at current 0.01 x I
n
(e = error in degrees)
Phase displacement error 2 = - e
Amplitude error at voltage U
n
(e = error in per cent)
Amplitude correction factor
= 1 / (1+ e/100)
Phase displacement error at voltage U
n
(e = error in degrees)
Phase displacement error
= - e
Amplitude error for the entire measuring range
(e = error in per cent)
Amplitude correction factor
= 1 / (1+ e/100)
Phase displacement error for the entire measuring
range (e = error in degrees)
Phase displacement error = - e
Amplitude error for the entire measuring range
(e = error in per cent)
Amplitude correction factor
= 1 / (1+ e/100)
Phase displacement error for the entire measuring
range (e = error in degrees)
Phase displacement error = - e