|
 
|
|
|
|
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.
|
|
This higher current affects the
electrical motors (particularly smaller
capacity motors upto 7.5 H.P.) in three
ways: |
|
1. Higher current
produces higher losses in electrical motors
which causes premature failure of winding.
2. These higher losses of electric
motors also increase the losses of cables,
switches, transformers & other associated
equipments.
3. 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 |
|
|
|
The table
below compares the behavior of 5 H.P. motor
at different voltage: |
|
Input Voltage |
Current |
KVA |
PF |
|
400 |
7.5
A |
5.2 |
0.8 |
|
425 |
11%
More |
18%
More |
0.7 |
|
435 |
19%
More |
28%
More |
0.61 |
|
445 |
26%
More |
38%
More |
0.57 |
|
|
|
The table
below compares the behavior of 60 watt lamp
at different voltage: |
|
Voltage |
Current |
Watts |
Luminous Intensity |
Life in Hours |
|
220 |
0.25 |
54
W |
690 |
2000 |
|
230 |
0.26 |
60
W |
710 |
1000 |
|
240 |
0.27 |
65
W - 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 |
|
|
|
|
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. |
|
|
|
Loss
Comparison of Muskaan Make Regulator &
Conventional make Regulator |
|
Capacity |
Muskaan make Roller type
regulator losses |
Conventional make Carbon brush
type Dimmerstat losses |
|
60
A |
575
W |
1050 W |
|
75
A |
730
W |
2055 W |
|
100
A |
900
W |
3105 W |
|
|
|
|
Table
below gives approximate quantitative advantages of automatic voltage controller
at various fluctuation levels: |
|
Input Voltage
Variation |
|
% Reduction in Breakdown
Possible |
|
Motor Load
Below 10 HP. |
Lighting
Load |
|
|
Approx. Power Saving
Possible |
|
Motor Load
Below 10 HP. |
Lighting
Load |
|
|
380-400
volts |
|
|
Nil |
Nil & Servo
Stabilizer Required |
|
|
380-420
volts |
|
|
|
380-440
volts |
|
|
|
360-460
volts |
|
|
|
360-480
volts |
|
|
|
340-500
volts |
|
|
|
|
|
|
 Description
of Servo Controlled AVC:
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.
|
|
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. |
|
|
