Application Guide - NP900 Series
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A996A
Figure 3.6.7.1-209 Control pulse timing settings.
Control pulses minimum and maximum times are user set. If during the control pulse tap
changes and the voltage changes as well to controlled direction the command is
terminated. If the maximum set control time has passed the control signal is terminated. In
case of instant low request the minimum time between pulses is used after the control
pulse is terminated to prevent new control pulse output during this time.
Tap settings
The properties of the used tap changer are set in Tap settings. Number of tap changer
positions and middle position as well as the position indication message is configured
here.
Example:
Transformer has tap changer with 18 positions of which position 9 presents middle
position. Tap changer location is indicated by mA signal 4…20 mA to the relay. Each tap
position has 1.67% effect to the transformer output voltage.
