BECKWITH ELECTRIC M-2601, Instruction Book

Page: 40 / 70

Applications – 4
4–1
4
Applications
4.0 Introduction ............................................................................... 4–1
4.1 Measurements & Calculations ................................................. 4–2
4.2 Voltage Regulation ................................................................... 4–3
4.3 Regulation Limits ...................................................................... 4–5
4.4 Non-Sequential/Blocking .......................................................... 4–5
4.5 Counters .................................................................................... 4–5
4.6 CT/VT Phase Shift .................................................................... 4–6
4.7 Ratio Multipliers ........................................................................ 4–6
4.8 Tap Position .............................................................................. 4–6
4.0 Introduction
The Autodaptive
®
Regulator Control (ARC) is a
unique control that relies on Autodaptive-style
algorithms to optimize voltage control while
minimizing the number of tapchange operations
required. This results in reduced tapchanger
maintenance and optimized loading.
VRQF
VRQF (Voltage Regulation Quality Factor) is
defined as the RMS deviation in voltage from a
reference voltage, as averaged over a selected
time period. The reference voltage for Autodaptive
Regulator Controls is the voltage setpoint of the
control. One purpose for the regulator control is
to minimize the VRQF or variation of the supply
voltage on a distribution system.
Use of the VRQF algorithm rather than conventional
voltage setpoint/bandwidth/preset timer results in
more precise distribution voltages with reduced
tap operations. The autodaptive voltage controls
operate with a voltage setpoint and a desired VRQF
setting. The bandwidth is a function of the
tapchanger voltage change per tap, and the timing
is adapted from past voltage (VRQF) history, and
the desired VRQF at the bus.