ITB RAV-2 - Page 11


Single Phase Voltage Regulator RAV-2
with control CTR-2
Instruction Manual MI-010
Page: 10/27
Rev. 06/2017
Table 2: Maintenance instructions.
Point
Item
Period
Verify Procedure or verification item Evaluation / Correction
Control
1
1 year
Manual control,
maximum and minimum
blocking.
- When selecting control in boost verify that
control increases tap changer position,
stopping in blocking position set on control
unit .
- When selecting control in buck verify that
control decreases tap changer position,
stopping in blocking position set on control
unit.
Control
2
1 year
Reference voltage
With regulator on service adjust Ur = 0 V,
Ux=0 V and insensibility in 1 V. Verify if
voltmeter output voltage is the same (+/- 1 V)
as reference after stabilization is achieved.
Control
3
1 year
Timing.Automatic
operation boosting and
bucking
Change the voltage reference value for a
bigger value that actual network voltage;
- Verify if motor actuates in boost sense after
time elapsed;
- Change the voltage reference value for a
lower value that actual network voltage;
- Verify if motor actuates in buck sense after
time elapsed.
Accessories
4
1 year
Isolators
1. Cracks in porcelain;
2. Accumulated impurities in porcelains;
3. Oil filtration;
4. Terminal tightening .
When contamination
results excessive clean
with cloth containing
ammonia or carbon
tetrachloride and apply a
neutralizer.
Accessories
5
1 year
Surge arrestors
1. Crackings;
2. Accumulated impurities.
Wash with fresh water, dry
and clean with dry cloth.
Tighten terminals when
loose.
Accessories
6
1 year
Oil level indicator
- Crack in the sight glass;
- Oil filtration.
- Change the glass display;
- Tighten sight glass body
or change packing.
Accessories
7
1 year
Oil drain valve - Oil filtration.
- Tighten, if filtering persist
remove equipment.
Insulation Oil
8
1 year
Get an oil sample
- Measure dielectric strenght;
- Neutralization index;
- Interfacial voltage;
- Power factor.
- Oil filtration when bellow
26 kV (NBR 6869)
dielectric strength
ITB - Equipamentos Elétricos Ltda.