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Automatic Voltage Controller / Servo Controlled
Voltage StabilizerRANGE:Upto 7000 kV For Low Voltage Class |
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In
spite of best efforts, no state electricity
board can ensure constant voltage to the
customer because of long and inadequate
distribution lines and irregular load pattern on
distribution transformers. Generally Voltage is
low during day time and high during night hours.
Moreover on holidays, peak hours, rainy days and
when agricultural and Industrial load is
switched off, the voltage rises sharply which is
more dangerous. |
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This higher current affects the electrical
motors (particularly smaller capacity motors
upto 7.5 H.P.) in three ways:
* Higher current produces higher losses in
electrical motors which causes premature failure
of winding.
* These higher losses of electric motors also
increase the losses of cables, switches,
transformers & other
associated equipments.
* For smooth continuous operation of motors, over
load relays are usually set at 20% higher
setting.
* With the installation of the Servo Controlled
Voltage Stabilizer and maintaining 390/400
volts, the motor will
operate smoothly drawing
15 - 20% lesser current
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The table below compares the behavior of 5 H.P.
motor at different voltage:
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Input
Voltage |
Current |
KVA |
PF |
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400 |
7.5 A |
5.2 |
0.8 |
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425 |
11% More |
18% More |
0.7 |
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435 |
19% More |
28% More |
0.61 |
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445 |
26% More |
38% More |
0.57 |
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The table below compares the behavior of 60 watt
lamp at different voltage:
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Voltage |
Current |
Watts |
Luminous
Intensity |
Life in
Hours |
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220 |
0.25 |
54 W |
690 |
2000 |
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230 |
0.26 |
60 W |
710 |
1000 |
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240 |
0.27 |
65 W - 8.3%
More |
820 |
575 |
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250 |
0.28 |
70.6 - 17.6%
More |
943 |
338 |
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260 |
0.29 |
75.4 - 25.6%
More |
1073 |
200 |
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270 |
0.31 |
83.4 - 39%
More |
1213 |
100 |
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and
correspondingly the relay setting can be reduced
by 15 - 20 %. In case single phasing occurs, the
relay will trip in 40-50 seconds. The motor can
withstand the high current for this period and
will be safe. Also, the relays, contactors,
switchgears, etc. incorporated with the motor,
will be safe.
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Loss Comparison of Muskaan Make Regulator &
Conventional make Regulator
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Capacity |
Muskaan make Roller
type regulator losses |
Conventional make Carbon brush
type Dimmerstat losses |
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60
A |
575
W |
1050 W |
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75
A |
730
W |
2055 W |
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100
A |
900
W |
3105 W |
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Table below gives approximate quantitative
advantages of automatic voltage controller at
various fluctuation levels:
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Input Voltage
Variation |
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% Reduction in Breakdown
Possible |
Motor Load
Below 10 HP. |
Lighting
Load |
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Approx. Power Saving
Possible |
Motor Load
Below 10 HP. |
Lighting
Load |
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380-400
volts |
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Nil |
Nil & Servo
Stabilizer Required |
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380-420
volts |
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380-440
volts |
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360-460
volts |
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360-480
volts |
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340-500
volts |
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Description of Servo Controlled
AVC
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 MUSKAAN'S
Servo Stabilizer is manufactured
as per IS : 9815 and primarily
consists of the following:
1. Liner Plus / Minus Type
Vertical Rolling Contact Voltage
Regulator
In our regulator we are using
heavy section of electrolytic
grade rectangular copper strip
instead of copper wire to
minimize the losses & increase
the efficiency of equipment. We
are also using self lubricating
Carbon Roller Assemblies instead
of ordinary Carbon Brushes which
offers more reliability and
trouble free performance of the
equipment.
2. Double Wound Buck / Boost
Type Series Transformers
In our Buck / Boost transformer
we are using CRGO lamination to
minimize iron losses and coils
of Buck/Boost transformer are
wound with heavy section of
multi strips electrolytic copper
to minimize copper losses for
getting better efficiency of the
equipment.
3. Electronic Control Circuit
and Meter Panel
MUSKAAN'S Automatic
Voltage Controller consists of
very simple electronic control
circuit for monitoring and
controlling voltage, repair &
maintenance of which is very
easy.
The regulator and Buck / Boost
transformer are oil cooled,
housed in same or separate sheet
steel tanks. Radiators are
provided for effective cooling.
The coils of voltage regulator &
Buck / Boost Transformers are
vacuum impregnated and oven
dried as per IS. |
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Superior Features Of Muskaan's
Make AVC. |
Temperature Rise
It is designed for 30-35 degree
C above ambient. Suitable for
any kind of ambient temperature
conditions.
Core
Core is constructed from Low
Loss of CRGO M-4 Grade
confirming to latest standards &
is fitted & clamped with special
built in-house frames to reduce
the magnetic noise & to make the
structure rigid & robust.
Windings
Use paper covered electrolytic
grade copper strip for winding.
Cooling ducts are provided to
keep the hot spot temperature as
low as possible.
Tanks & Paint
Tanks are made of M.S. Sheets
with adequate bracing &
stiffeners are given a coat of
Epoxy Primer & Epoxy paint for
better life. Both light grey &
Siemens grey (RAL 7032) are
available in colour.
Oil
Oil of IS: 335 standard is being
used & is filtered before
topping. |
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