Single Phase Voltage Regulator RAV-2
with control CTR-2
Instruction Manual MI-010
Page: 8/27
Rev. 06/2017
OBSERVATION 2: For regulators connected in closed delta that may work in inverse power
flow the usage of external voltage transformer is mandatory, except when this is caused by
cogeneration.
Function on screen 47 (OPMEDF) – Optional metering of voltage on source side, to be configured for use of
external voltage transformer on source side.
SUPORT AND FIXING
Regulators with an overall weight of up to 1500 kg may be installed in platforms or poles. Above this weight it has to
be installed in platforms. In both cases equipment has to be correctly leveled. Regulators are designed to be air
cooled so its refrigeration depends on this. In case of installation indoors ensure adequate ventilation and free space
to allow operations, inspection and maintenance.
High tension connections
High tension connections has to be made so as to ensure that nominal voltage in terminals Source “S” or “L”, and
Common “SL” does not exceed nominal value indicated on nameplate of regulator. Connections on terminals of
bushings have to be tightened so as to avoid hot spots and/or bad contact.
CAREFUL: while mounting or connecting equipment, no mechanical tension has to be
transmitted to bushings as it may lead to loosening bushings or its internal connections,
breakage of sealing which may cause a bad connection, heating, broken conductors, isolation
problems, oil spilling among others
Cables and terminals must be flexible enough to avoid that mechanical stress caused by wind or by the
expansion and contraction of metals reach regulators bushings as these effects can damage porcelain
insulators which are limited to withstand impact, shock and mechanical stress in general. For the same
reason it is not allowed bushings to be connected directly to the network without the intermediation of proper
support to keep the wires correctly fixed.
REGULATOR PLACEMENT IN SERVICE
If regulators are mounted with appropriate disconnector blades as suggested in CONNECTION SYSTEM in this
manual, placement in service may be executed without power interruption.
The procedures described below are extremely important to ensure that the regulators are ready to be placed in
service.
Connections
Identify in cover bushings “S”, “L” and “SL” and make appropriate electrical connections for the regulator/s as
detailed in connection diagrams (see “connection systems”)
Placing in service
DANGER: This procedure, when done without regulators being on neutral position, cause
short-circuit with severe damage risk for equipment, network and personnel
Proceed with following sequence :
1. As per data on nameplate, verify if control circuit is correctly configured for adequate voltage;
2. Place the “Normal/ Turn off / External” switch of the control panel in “Turn off” position;
3. Only for DELTA connected equipment, close the disconnect blade on “SL”;
4. Close the disconnect blade on “S”;
Note: If using a one-action switch, where opening of source, opening of load and bypass
closing is done automatically, this step is not possible. Previous Neutral position
confirmation is not possible without an external supply
5. Place the “Normal/ Turn off / External” switch of the control panel in “Normal” position;
6. Press the “Raise” button or “Lower” so as to operate its tap changer two or three steps, then press “Auto Zero”
button so as to return tap changer to neutral position. When in neutral position and “Bypass” ) LEDs will light and
position indicator will show “0” with a (tap changer in neutral position, ready for operation) message displayed;
DANGER: Due to risk of an out-of-position maneuver, the Auto Zero, however automatic, must
be obligatorily monitored by the operator who must observe the sequence of modification of
indication of the positions checking its sequence and logic.
ITB - Equipamentos Elétricos Ltda.
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