Single Phase Voltage Regulator RAV-2
with control CTR-2
Instruction Manual MI-010
Page: 12/27
Rev. 06/2017
It. Description It. Description
12 Mobile contacts 28 Neutral motor
13 Supporte and pinion for mechanical indicator 29 Positioned disk
14 Reverse gear contact 30 Assembly plates separator
15 Insulating separator of the assembly plates 31 Micro switch of neutral position
16 Premix plate
Verifying points in on load tap changer:
1. All nuts acting on brass straps must be tightened with a torque of 1.2 kgf.m;
2. The drive chain must have minimum clearance of 15 mm and maximum 25 mm;
3. The motor encoder (encoder) must be synchronized with the movable contact such that at the nominal position
no contacts are closed ("0" will be displayed on the screen of the control);
4. Mechanical blocks must be tested with supply up to 140 Vac verifying motor acts correctly and inversion switch
must be tested with the engine fed with a voltage of 95 Vac. (Engine must be connected to capacitor 20 uF 380
Vac).
WINDINGS
All ITB regulators have 3 sets of independent coils (separate core):
1. A large set of coils mounted in the lower part of the regulator which concentrates measurement voltage
transformer, the parallel coil, series coil, derivations and equalization coil;
2. An enrollment located at the top of primary enrollment which is the reactor;
3. A toroidal enrollment located over the reactor which is the current transformer responsible for measuring the load
current. Each one of these enrollments is constructed and connected according to specific project features which
vary depending on the application and use conditions requested, so regulator id number has to be informed when
requesting spare parts.
CONTROL CTR-2
The CTR -2 electronic control is a microprocessor based equipment capable of performing voltage regulation
functions, delay of actuation time and data collection for voltage quality control in electrical network which may be
ITB - Equipamentos Elétricos Ltda.
Figure 12: Parts of the under load tap changer.
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