Specifications

POWER Automatic voltage controller 1600 KVA

Automatic Voltage Controller

 

Automatic voltage controller increases system efficiency and power quality by automatically monitoring and controlling busbars, transformers and other devices. Some of the common voltage controller devices include stabilizers, regulators, electroplating rectifiers, etc. On a power distribution system experiencing varying loading conditions, this type of sophisticated substation automation application can effectively maintain a steady transformer secondary voltage within preset limits.

The high capacity automatic voltage controllers manufactured in our unit are supervised by a team of qualified and experienced engineers. Our chief goal is to satisfy our customers by manufacturing quality products.

High current on a load affects electrical motors (smaller capacity motors upto 7.5 H.P) and devices in the following ways:

• High current causes premature failure of winding in electrical motors leading to their damage or higher losses.
• The higher losses of electrical motors in turn leads to damage of cables, switches, transformers and other associated equipment.
• In order to ensure smooth and continuous working of electrical motors, overload relays are generally set at 20% higher setting.

With the installation of the stabilizer and maintaining 390/400 volts, the motor will operate smoothly. It will draw 15 to 20% lesser current and correspondingly the relay setting can be reduced by 15 to 20%. When single phasing occurs, the relay will trip in 40 to 50 seconds. The motor can withstand the high current during this period and will be safe. Also, the switchgears, relays, contactors etc. incorporated with the motor will be safe.


Types of Automatic Voltage Controllers

• Balanced Type Automatic Voltage Controller
• Automatic Voltage Controller with Bye-pass arrangement
• Unbalanced Type Automatic Voltage Controller
• Automatic Voltage Controller with Isolation

Servo Stabilizer is an automatic voltage regulator, which primarily consists of the following features :

• Linear, plus / minus type vertical rolling contact voltage regulator
  For making these regulators, we use heavy section of electrolytic grade rectangular copper strip instead of copper wire in order to minimize the losses & increase the efficiency of equipment. We also employ self lubricating Carbon Roller Assemblies instead of ordinary Carbon Brushes that offers more reliability and trouble free performance of the equipment.
• Double wound buck / boost type series transformer
  In our Buck / Boost transformer, we make use of CRGO lamination to reduce iron losses. The coils of Buck / Boost transformer are wound with heavy section of multi strips electrolytic copper to minimize copper losses to get better efficiency of the equipment.
• Electronic control circuit and meter panel
  Automatic Voltage Controller usually consists of very simple electronic control voltage circuit for monitoring and controlling voltage, repair and maintenance of which is very easy. The regulator and Buck / Boost transformer are oil cooled, placed in same or separate sheet steel tanks. These devices are provided with radiators for effective cooling. The coils of voltage regulators & Buck / Boost Transformers are vacuum impregnated and oven dried as per IS.

 

 

 

 

The table below compares the behavior of 5H.P. Motor at different voltage:

Input Voltage	Current	KVA	PF
400	7.5 A	5.2	0.8
425	11%	18%	0.7
435	19%	28%	0.61
445	26%	38%	0.57

 

The table below compares the behavior of 60 Watt lamp at different voltage:

Voltage	Current	Watts	Luminous Intensity	Life in Hours
230	0.26	60 w	710	1000
240	0.27	65w-8.3% More	820	575
250	0.28	70.6-17.6% More	943	338
260	0.29	75.4-25.6% more	1073	200
270	0.31	83.4-39% more	1213	100

 

The table below gives approximate quantitative advantage of Automatic voltage controller at various fluctuation leves:

 

Input Voltage variation	% Reduction in breakdown Possible   Motor LOAD                                         Lighting Below 10 HP.                                               Load		Approx. Power Saving Possible   Motor LOAD                                         Lighting Below 10 HP.                                               Load
380-400volts	Nil	Nil	Nil	Nil &No servo Stabilizer required
380-420 volts	5%	10%	3%	5%
380-440 volts	10%	20%	5%	10%
380-460 volts	40%	40%	7%	20%
380-480 volts	60%	60%	10%	30%

 

WINDING

 

Coils are wound with paper covered electrolytic grade copper strip or synthetic enameled copper conductors. Cooling ducts are provided to keep the hot spot temperature as low as possible. Coils are dried in electric ovens. Rigid connection support and coil clamping is provided to ensure high short circuit strength.

 

 

 

 

 

INSULATION

 

Precompressed board PARMALI board and JAPANEESE insulation paper of best quality is used.

 

 

 

 

 

OIL

 

Oil tested for resistivity, dielectric and acidic characteristic conforming to IS 335. Before topping up, oil is filtered thoroughly.

 

 

 

 

 

 

 

TANKS & PAINT

 

The tanks are made of M.S Steel plated / sheets with adequate bracing & stiffeners. All the external surfaces are given a primary coat of Epoxy primer and finishing coat of Epoxy paint for better life.

 

 

 

 

 

 

 

METER & CONTROL SYSTEMS

 

High Quality meters and quality products for controls are used.

 

 

 

AUTOMATIC VOLTAGE CONTROLLER

POWERMAKE ROLLER TYPE REGULATOR BRUSH	CONVENTIONAL MAKE WITH CARBON REGULATOR
.Power consumption is 0.5 to 15% depending upon the model and input voltage variation.	.Power consumption is 2 to 7% depending Upon the model and input voltage variation.
.Suitable for continuous 100% Duty cycle.	.Suitable for only 30% to 40% duty cycle.
.The carbons (graphite) Roller roll, while moving on the coil    track, so contact Point of the roller goes on changing which prolongs the life of the rollers.	.Since the contact is by brush having flats surface, wear & tear of the brush is more and requires wear & tear of the brush is more and requires frequent replacement.
.Life at full load is 15-20 year.	.Maximum life is 2-3 years at full load.
.Negligible losses in full Buck / Boost Condition.	.Max. Losses in full Buck / boost condition.
.Five years Unconditional warrantee in India	.Normal warrantee for one year.

 

 Loss Comparison of  POWER  make Regular and Conventional make Regulator

 

Capacity	Power make Roller type Regulator losses	Conventional make Carbon brush type Regulator losses
60 A	575 W	1050 W
75 A	730 W	2055 W
100 A	900W	3105 W