ABB REG316 4 Series Operating Instructions Manual page 394

ABB Switzerland Ltd
E. Setting Instructions
To get the best performance from the measurement module, be
sure to set it properly. The following notes should help to decide
the correct settings:
· Reference values for the analogue input channels
The settings in this case should be chosen such that the
functions measures 1.000 UN and 1.000 IN when rated
voltage and current are being applied. In many cases the
default setting (1.000) will be satisfactory.
· Phase compensation "Angle comp"
This setting is important for correct measurement of active
and reactive power and the power factor cos j . For most
cases, it is possible to accept the default value 0.0°.
A different setting may be necessary to compensate the
following:
a) c.t. and v.t. phase errors
à typical setting: between -5.0° and +5.0°
b) correction of direction of the measurement or c.t. or v.t.
polarity
à typical setting: -180.0° or +180.0°
Add multiple errors to obtain the correct compensation
setting.
The angles given apply for connection according to the
connections in Section
· Voltage measurement
The zero-sequence component in case of delta-connected
v.t's is assumed to be zero, but with Y-connected v.t's the
zero-sequence voltage does have an influence on the phase-
to-ground measurements. In an ungrounded power system,
the phase-to-ground voltages will float in relation to ground.
· Power and frequency measurements
A power measurement is obtained by summing the powers of
the three-phase system: 3 ´ S = U
The measurement is largely insensitive to frequency in the
range (0.8...1.2) f
positive sequence voltage. Should the voltage be too low, the
frequency is not measured and a value of 0.0 Hz results.
· Where only the impulse counter is in use, both analogue
inputs (current and voltage) must be disabled.
3-356
REG 316*4 1MRB520049-Uen / Rev. F
12.
´ I
R
. The frequency measured is that of the
N
´ I ´ I
* + U * + U
R S S T
*.
T