Application Guide - NP900 Series
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A996A
3.6.7.1
AVR
FEATURES AND CONFIGURATION
AVR features separate definite and inverse operating time voltage raise and lower
windows, instant overvoltage lower, undervoltage blocking and inbuilt overcurrent blocking
functions. Target voltage as well as operating settings for the voltage windows can be
changed via setting group changes. Tap changer location is monitored with mA
measurement. Tap changer position can be controlled with automatic control and manual
control. AVR monitors bus phase to phase voltage. Operation of the AVR can be blocked
by external commands by blocking either control algorithm completely or blocking the
control outputs only.
Configuring of the AVR is presented in following examples.
General settings
General settings include the measurement reference voltage selection. In this part the
measured phase to phase voltage has to be selected as well as the measurement input in
case if U4 input is used for voltage measurements.
