KMB NOVAR-1 Series, Operating Manual

Page: 33 / 77

Novar 1xxx KMB systems
33
4.1.10.1 Setting Type of Connection Configuration if Measuring at Power Supply
Transformer’s Opposite Sides
If the measurement current signal is from the power supply transformer’s side which is opposite to
measurement voltage signal side, the transformer phase angle is conclusive for correct parameter 15
setting. This value specifies the angle between voltage vectors of corresponding phases at primary
and secondary sides. The transformer phase angle can be in the range from 0 to 11, corresponding to
phase angles from 0 to 330 degrees (in steps of thirty degrees).
Provided the measurement voltage signal is connected in accordance with the type of transformer
(that is phase measurement voltage is connected to controller with wye, or star, connection or line
measurement voltage with delta connection), it is necessary to set
phase type of connection with
even transformer phase angle value and line type of connection with odd transformer phase angle
value.
If the measurement voltage signal is connected in disaccordance with the type of transformer, the
opposite rule applies: line connection with even transformer phase angle or phase connection with
odd transformer phase angle.
Determining parameter 15 explained in practical examples:
Example 1:
Compensation is to be provided for consumption supplied via a Dy1 transformer while line
measurement voltage will be taken from its primary side (D stands for delta connection) and
measurement current signal from a metering current transformer at the power supply transformer’s
secondary side (y stands for wye, or star, connection).
determining type of connection (parameter 15):
1. The transformer’s primary side is delta-connected and line primary voltage will be connected
to the controller (usually via a metering voltage transformer with nominal output voltage 100 V
AC) — this means the measurement voltage will be connected
in accordance with the type
of transformer.
2. Since the measurement voltage is connected in accordance with the type of transformer and
the transformer phase angle (1) is odd , you set the type of measurement voltage connection
configuration to line . (If the transformer phase angle was even or if the measurement voltage
was not connected in accordance with the type of transformer, you would specify phase
connection configuration).
Example 2:
Compensation is to be provided for consumption supplied via a Yy6 transformer while the line
measurement voltage will be taken from its secondary side (y stands for wye, or star, connection) and
measurement current signal from a metering current transformer at the power supply transformer’s
primary side (Y stands for wye, or star, connection again).
determining type of connection configuration (parameter 15):
1. The transformer’s secondary side is wye-connected, but the line secondary voltage will be
connected to the controller — this means the measurement voltage will be connected in
disaccordance with the type of transformer.
2. The measurement voltage is connected in disaccordance with the type of transformer and
the transformer phase angle (6) is even , so you set parameter 15 to line . (If the
measurement voltage was connected in accordance with the type of transformer, you would
set phase connection).