2. Welcome- Sree Meenakshi Electricals
Sree Meenakshi Electricals, is considered to be one of the leading System Integrators and
suppliers of a variety of Power Electronics system Products and Electrical Power Quality Products.
Established in the year 2009 in Trichy, we are supplying System assembled power quality products
and Power Electronics for application in various industries across India.
We offer a wide range of products to our customers like Power factor Control Panel, LT Capacitors,
UPS, Battery etc at the best price in the market. In order to achieve total customer satisfaction, we
strive hard to satisfy their needs, by maintaining timely delivery, supplying quality products, after
sales service and so on.
Few leading Brands we deal with are EPCOS, L&T, Schneider Electric and ZEZ SILKO Capacitor
Our tailor made APFC panels perfectly meets out the plant’s requirements which results in good
power factor and reduced electricity consumption.
Textile Industries, Distilleries, Rice Mill, Oil mill, Hospitals, Welding companies, crusher plants,
paint manufacturers and other Industries are those industries where we have supplied our panels
are running successfully and customer satisfactory.
Our Power Electronics Partners are Microtek, Sukam, Luminous, Compact and Exide etc., Batteries
we deal with Exide and Hi-Power etc.,
Sree Meenakshi Electricals will become one stop shop solution provider for all Power Factor and
Power Electronics problems with our Personalized and customized services.
3. Our mission is to provide a qualitative
range of Power Quality and Power
electronic systems that are able to fulfill
the quality as well as performance needs of
all types of industries and all other
Applicable segments.
We aim to provide our clients with smooth
& efficient running of the system which
results in Total customer satisfaction.
Our Mission
4. Incepted in the year 2009, We focused on both Industrial and
Domestic requirements, such us Electrical Power quality
Power Capacitors, LT Capacitor Banks, Automatic Power
Factor Correction Control Panels (Contactors and Thyristors
Based), Harmonic filters (Active and Passive filters), Hybrid
PFC Panels , Power Electronics Online UPS and Offline UPS
and Inverters, Batteries like Tubular Technology and Lead
Acid Batteries and Sealed Maintenance Free Batteries.
We provide customized solutions to our customers as per
their specifications.
Sree Meenakshi Electricals lay emphasis on maintaining
quality in all the panels Designed and System Integrated by
us. We make sure that all our products are of made premium
quality.
ABOUT US
5. Our Motto is Power saving and Power Serve.
Power Quality
Our Electrical Energy saving Products are
• Capacitors
• Capacitor Banks
• Automatic Power Factor Control Panels (Contactors
and Thyristors Based)
• Harmonic filters (Active and Passive filters) and Hybrid
PFC Panels and others etc.,
Our all Electrical Power Quality Products for Power
Saving and maintaining good Power factor.
PRODUCTS
6. Capacitors
A capacitor (originally known as a condenser) is a passive two
terminal electrical component used to store
electricalenergy temporarily in an electric field. The forms of
practical capacitors vary widely, but all contain at least
two electrical conductors (plates) separated by a dielectric (i.e.
an insulator that can store energy by becoming polarized). The
conductors can be thin films, foils or sintered beads of metal or
conductive electrolyte, etc. The nonconducting dielectric acts
to increase the capacitor's charge capacity. A dielectric can be
glass, ceramic, plastic film, air, vacuum, paper, mica, oxide
layer etc.
7. Capacitor Banks
Under Electrical Transmission, the demand of active power is
expressing Kilo watt (kw) or mega watt (mw). This power should
be supplied from electrical generating station. All the
arrangements in electrical pomes system are done to meet up
this basic requirement. Although in alternating power system,
reactive power always comes in to picture. This reactive power is
expressed in Kilo VAR or Mega VAR.. The demand of this
reactive power is mainly originated from inductive load connected
to the system. These inductive loads are generally
electromagnetic circuit of electric motors, electrical transformers,
inductance of transmission and distribution networks, induction
furnaces, fluorescent lightings etc.
8. Automatic Power Factor Control
Panels (Contactors and
Thyristors Based)
The power factor of an AC electrical power system is defined as the ratio of the real
power flowing to the load to the apparent power in the circuit, and is a dimensionless
number in the closed interval of -1 to 1. A power factor of less than one means that the
voltage and current waveforms are not in phase, reducing the instantaneous product of the
two waveforms (V x I). Real power is the capacity of the circuit for performing work in a
particular time. Apparent power is the product of the current and voltage of the circuit. Due
to energy stored in the load and returned to the source, or due to a non-linear load that
distorts the wave shape of the current drawn from the source, the apparent power will be
greater than the real power.
Thyristor Switching of capacitors for power factor improvement has many advantages over
conventional contactor switching. Thyristor Switching is highly reliable with minimum
maintenance, especially suitable for fast variable loads, where contactor switching systems
fail to give desired results. The capacitors are switched at "ZERO CURRENT CROSS
OVER THRESHOLD".
9. Harmonic Filters
Harmonic voltages and currents in an electric power system are a
result of non-linear electric loads. Harmonic frequencies in the power
grid are a frequent cause of power quality problems. Harmonics in
power systems result in increased heating in the equipment and
conductors, misfiring in variable speed drives, and torque pulsations in
motors. Reduction of harmonics is considered desirable.
Harmonic Filters are designed to attenuate troublesome harmonics to
within defined parameters or dampen system resonances to prevent
harmonic amplification. Our highly qualified and experienced chartered
engineers have been designing Harmonic Filters since the proliferation
of non-linear harmonic producing loads began back in the 1980’s.
10. Thyristor switched fast response P.F.
correction systems
Conventional contactor switching P.F.
correction systems
Load P.F. correction is quick and consistently
near to the set value. Total P.F. correction is
achieved within few hundred milliseconds.
P.F. correction is slow. Total correction
takes few minutes.
Fast P.F. correction reduces maximum demand
more effectively, hence more savings on
account of reduction in MD charges.
Slow response; P.F. correction is not as
effective in reducing maximum demand,
especially when the load variations are
fast.
Capacitors are switched through thyristors at
"zero current crossover threshold". Hence the
capacitor connection to the mains is always
smooth, transient free and absolutely without
generation of harmonics and voltage spikes.
Comparison between Fast response Thyristor Switched
and Contactor Switched Capacitor A.P.F Correction
Systems
11. Power Electronics Products
UPS
Online & Offline UPS
Inverter
Sinewave, Squarewave & Quasi
wave Inverter
Batteries
SMF, Lead Acid & Tubular Batteries
12. UPS
An uninterruptible power supply, also uninterruptible power
source, UPS or battery/flywheel backup, is an electrical apparatus that provides
emergency power to a load when the input power source, typically mains power,
fails. A UPS differs from an auxiliary or emergency power system or standby
generator in that it will provide near-instantaneous protection from input power
interruptions, by supplying energy stored in batteries, super capacitors, or flywheels.
The on-battery runtime of most uninterruptible power sources is relatively short (only
a few minutes) but sufficient to start a standby power source or properly shut down
the protected equipment.
A UPS is typically used to protect hardware such as computers, data
centers, telecommunication equipment or other electrical equipment where an
unexpected power disruption could cause injuries, fatalities, serious business
disruption or data loss. UPS units range in size from units designed to protect a
single computer without a video monitor (around 200 volt-ampere rating) to large
units powering entire data centers or buildings. The world's largest UPS, the 46-
megawatt Battery Electric Storage System (BESS), in Fairbanks, Alaska, powers the
entire city and nearby rural communities during outages
13. Online & Offline UPS
Online UPS: In online UPS, the internal circuitry of UPS is sorted as:
AC Mains->Rectifier (Charger)->Battery->Inverter->Load
As shown above, we can see that there is no link between Mains AC Supply and Load in
ON line UPS . The load get power supply from Inverter whether the main supply is ON
or OFF.(Although, we can draw an AC line directly from AC mains to load, in case our
inverter stop working due to any reason. Then we have to use transfer switch which will
transfer control of power from inverter to direct AC mains) In this type of UPS, the
inverter works continuously therefore this type of UPS are also called Continuous mode
UPS.
OFF-Line UPS: The only difference between ON Line and OFF line UPS is that in
Offline UPS load has a direct link to ac mains via a static switch, while having other
same circuitry. In case of OFF line UPS, the inverter doesn't remains it ON state as ON
line UPS, Instead it comes to On only when the Main supply gets OFF. When the main
supply is ON the load derives power directly from AC supply. When the Mains
AC supply gets OFF, then inverter come to play and convert incoming DC supply from
Batteries to AC. This inverted ac is then fed to load. Here we make use of static switch
which immediately switches from one supply to another in case ac mains gets off. The
switching time of OFF line UPS is almost equal to five mili seconds.
14. Inverter
A power inverter, or inverter, is an electronic device or
circuitry that changes direct current(DC) to alternating
current(AC).
The input voltage, output voltage and frequency, and
overall power handling depend on the design of the specific
device or circuitry. The inverter does not produce any
power; the power is provided by the DC source.
A power inverter can be entirely electronic or may be a
combination of mechanical effects (such as a rotary
apparatus) and electronic circuitry. Static inverters do not
use moving parts in the conversion process.
15. Sinewave, Squarewave &
Quasi wave Inverter
Square wave
This is one of the simplest waveforms an inverter design can produce and is useful for
some applications.
Sine wave
A power inverter device which produces a multiple step sinusoidal AC waveform is
referred to as a sine wave inverter. To more clearly distinguish the inverters with outputs
of much less distortion than the "modified sine wave" (three step) inverter designs, the
manufacturers often use the phrase pure sine wave inverter.
Modified sine wave
A "modified sine wave" inverter has a non-square waveform that is a useful rough
approximation of a sine wave for power translation purposes.
The waveform in commercially available modified-sine-wave inverters is a square wave
with a pause before the polarity reversal, which only needs to cycle back and forth
through a three-position switch that outputs forward, off, and reverse output at the pre-
determined frequency. Switching states are developed for positive, negative and zero
voltages as per the patterns given in the switching Table 2. The peak voltage
to RMS voltage do not maintain the same relationship as for a sine wave.
16. Batteries
An electric battery is a device consisting of two or
more electrochemical cells that convert stored chemical energy
into electrical energy. Each cell has a positive terminal,
or cathode, and a negative terminal, or anode. The terminal
marked positive is at a higher electrical potential energy than is
the terminal marked negative. The terminal marked positive is the
source of electrons that when connected to an external circuit will
flow and deliver energy to an external device.
When a battery is connected to an external
circuit, Electrolytes are able to move as ions within, allowing the
chemical reactions to be completed at the separate terminals and
so deliver energy to the external circuit. It is the movement of
those ions within the battery which allows current to flow out of
the battery to perform work.
17. SMF, Lead Acid & Tubular Batteries
SMF: A VRLA battery (valve-regulated lead-acid battery), more
commonly known as a sealed battery or maintenance free battery, is
a type of lead-acid rechargeable battery Due to their construction, they
can be mounted in any orientation, and do not require constant
maintenance. The term "maintenance free" is a misnomer as VRLA
batteries still require cleaning and regular functional testing. They are
widely used in large portable electrical devices, off-grid power systems
and similar roles, where large amounts of storage are needed at a
lower cost than other low-maintenance technologies like lithium-ion.
Lead Acid: The lead–acid battery was invented in 1859 by French
physicist Gaston Planté and is the oldest type of rechargeable battery
Despite having a very low energy-to-weight ratio and a low energy-to-
volume ratio, its ability to supply high surge currents means that the
cells have a relatively large power-to-weight ratio. These features,
along with their low cost, makes it attractive for use in motor vehicles to
provide the high current required by automobile starter motors.
18. SMF, Lead Acid & Tubular Batteries
Tubular Batteries :Tubular battery is one of the two
popular battery designs, the second one being the
flat pasted plate battery design. Tubular batteries
have more complex designs, as they consist of a
number of parallel tubes containing lead oxide.
Despite of more efforts required in manufacturing
them, these batteries are widely demanded for a
number of applications these days.
A significant advantage of a tubular battery is its
ability to charge at a fast rate. This is one useful
characteristic that makes these batteries highly
recommended for applications that require high
productivity. Tubular batteries are available in
different design variations to make them work for
different applications.
