Application
The KVGC 202 relay can be used to
maintain a regulated voltage supply
to electrically powered equipment
within finite limits of a designed rated
voltage. Failure to maintain a
regulated voltage supply within these
limits may cause extensive damage.
This is achieved by the operation of
voltage regulating transformers of
various types, the most common being
the on load tap changing transformer
which maintains a stable secondary
voltage by selecting appropriate
tappings on the secondary windings.
The tap changer operation is
controlled automatically by the
voltage regulating relay, which
continuously monitors the system
voltage and initiates the tap changer
mechanism to raise or lower the
voltage to be within set limits of a
desired value.
Typical application diagrams are
shown in Figures 5, 6, 7 and 8.
2
Type KVGC 202
Voltage Regulating Control Relay
Figure 1: Relay type KVGC 202
Control Functions
Transformer tap change
control
The regulated voltage, Vs, and the
deadband, dVs, settings are user
selectable. When the regulated
voltage moves outside the
deadband setting, the relay
actuates the tap changer
mechanism to raise or lower the
voltage to be within the set
deadband limits.
The relay has an initial time delay
before initiating the first tap change
to minimise unnecessary changes
due to transient voltage fluctuations
this initial time delay is selectable
for either definite or a time delay
which is inversely proportional to
the degree of voltage variations
from the Vs setting.
Subsequent tap changes are
initiated after an inter-tap delay. |
Indotrade Priority 15th Year
