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AC
Automatic Voltage Stabilisers
and Regulators
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A Design
Technology Overview
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Kick jump links
to design technologies reviewed: |
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Ashley
Edison Global Power Protection Solutions |
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. . . the informed choice |
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With our
wide manufacturing base and the outstanding reliability
of our electronic -servo and solid state stabiliser
designs, our AC Automatic Voltage Stabilisers & Power
Conditioners are on
duty throughout the world - facing some of the most
rigorous and demanding environments. |
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Every AC
Voltage Stabiliser solution we offer is backed by the
unrivalled experience we have gained in world markets
over the last 25 years or so. In that time, our unique
design innovations have set new performance levels and
the breadth of our offering has broadened to accommodate
the needs and ever demanding requirements of our growing
Client base. |
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Our success is based entirely on our ability to meet the
requirements of our customers dependably and
cost-effectively. Today, where performance is
everything, whatever your AC mains supply problem
Ashley-Edison have the ability to offer a solution from
our extensive range of standard and custom built
products. |
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The Ashley-Edison ranges of
AC Voltage Stabilisers / Regulators & Power Conditioners
combine exceptional performance and ISO 9001 certified build quality to
deliver unmatched reliability and versatility, all at
truly unbeatable prices. |
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Voltage Stabilisers |
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Power Conditioners |
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Ashley-Edison |
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at your Service |
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In Telecommunications |
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TV, radio and telephone transmitters and relay stations,
radar installations, navigational beacons etc, all need
dependable power for reliable operation. |
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Many such facilities are in remote locations,
supplied over long lines or even from their own
generators. Ashley-Edison units are in service worldwide
- with communication networks, even national security,
depending on them.
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In
Computers |
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Computers
and other electronic business systems are highly
sensitive to power fluctuations. Even a brief voltage
drop below design limits will upset logic circuits,
bringing chaos to stored data,
calculations etc. So the fast response
Ashley Edison Automatic Voltage Regulators (AVRs) are playing a major
role in computer applications around the world. |
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In
Industry |
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Many
processes and production lines slow down and even stop
as a result of power problems. With just a simple
voltage drop welding equipment produces faulty welds,
ovens and furnaces take far longer to heat up,
electroplating processes lose their efficiency and
today's microprocessor controlled machine tools develop
faults. All reasons why industrial plants worldwide look
to Ashley-Edison for the solution to their power
problems. |
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In
Refrigeration |
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When
air-conditioning and refrigeration systems experience
any form of power disturbance, even just a minor voltage
fluctuation, impaired
performance or often system shutdown is the end result. |
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With such problems being of common concern, Ashley-Edison units are
regularly relied upon to guarantee the availability of a
clean and regulated power source. |
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In
Research |
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Electronic
instruments play a major role in laboratory work and
their measuring accuracy depends totally on the quality
of power they receive. An abrupt voltage drop from a
factory process starting up
nearby perhaps can invalidate the results from a costly
research programme. |
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Today many world research establishments depend on
Ashley Edison for ensuring the quality of their power
supply whether it be for a single instrument or an
entire laboratory. |
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Back
to Top |
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Electronic Servo
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Saturable Reactor
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Magnetic Induction
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Ferro-Resonant
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Electronic Tap
Switching |
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For most
applications our Servo Electronic -Electro
Mechanical Ranges (SES/SESL - Voltage
Stabilisers & PCS - AC Power Conditioners) have
proved to be a very reliable and cost-efficient
voltage stabilisation solution, being able to
accommodate an input voltage swing of in excess
of 40% whilst still delivering an accuracy of 1%
on the output. |
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Comprising a transformer having its secondary
winding connected between the mains supply and
the load, the primary voltage is automatically
controlled through a motor driven variable
transformer - ensuring a continuous, smooth and
very stable output voltage. |
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High Voltage / Transient Spikes are normally
limited by the inclusion of ‘Spike Clippers’.
Such clippers typically limit transients to
twice the peak voltage of the supply. To reduce
the spikes to totally harmless levels it is
often necessary to ask your supplier to fit
additional Spike Attenuation protection. With
Ashley Edison SES / PCS solutions this feature
is supplied as standard. |
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While
Electronic Servo stabilisers do contain some
moving parts, experience over the last 25 years
in some of the most demanding power conditions
has proved the design to be a very reliable
method of delivering voltage regulation with
only a low-level of ongoing maintenance
required being deliverable by universally
readily available skill sets.
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The
long-life expectancy, compact size and low cost
of ownership makes servo-electro mechanical
stabilisers economical solutions for a wide
variety of applications in industry, commerce,
mining, aerospace, computing and
telecommunications and is normally our
recommended solution for most clients.
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Design
Advantages |
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Design
Disadvantages |
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Size and
weight advantages over other methods of stabilisation |
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Moving parts requiring limited maintenance |
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Fast speed
of response to voltage changes – ideal for most
applications |
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Lower
speed of response compared to solid state designs |
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Very
competitively priced |
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Negligible
output waveform distortion |
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Not
Frequency dependent |
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Will
attenuate voltage spikes if required |
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Unaffected
by load or power factor changes |
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Low cost of
ownership with ease of serviceability |
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Endurable,
with long life expectancy |
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Ashley-Edison Electronic Servo Solutions |
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SES
Series |
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Single &
Three Phase |
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1 to 500
kVA |
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SESL
Series |
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Three
Phase |
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150 to
2000 kVA |
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OSES
Series |
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IP54
Outdoor |
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Single &
Three Phase |
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6 to 500
kVA |
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SES-R
Series |
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Rack Mount |
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Single
Phase |
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3
to 20 kVA |
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SES-HL & LH
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Step Up / Down |
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Three
Phase |
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10 to 100
kVA |
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PCS
Series |
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AC Power Conditioners |
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Single &
Three Phase |
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1 to 150
kVA |
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Due to
the general popularity of this method of voltage
stabilisation and the high demand for models
between 1kVA and 500kVA it is often possible to
purchase most standard SES S15 models from stock
or, like larger models and those with wider
input voltage swings, on short lead delivery
times. |
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With
no moving parts, solid state design based
systems utilise the latest in IGBT control
circuitry delivering a very high speed of
response and output accuracy maintained to ±0.5%.
Since all components are of electronic design,
they are virtually maintenance-free
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Solid state based
systems (PEN Voltage Stabilisers & PCEN AC Power
Conditioners) are ideal solutions for equipment
that must have output voltage accuracy better
than 1%. |
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Design
Advantages |
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Design
Disadvantages |
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High
speed of response to voltage changes |
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Usually less price
competitive when compared to Servo Electronic
design |
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Output
voltage accuracy better than 1 %, typically 0.5% |
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No
Moving parts – virtually Maintenance Free |
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High weight to kVA ratio compared to Electronic
Servo design |
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High
efficiency |
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Not
Frequency dependent |
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Output
voltage does not collapse on overload or sever
input voltage drop |
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Low
output waveform distortion |
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Unaffected by load or power factor changes |
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Will
attenuate voltage spikes if required |
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Ashley-Edison Saturable Reactor Solutions |
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PEN
Series |
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Single &
Three Phase |
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2 to 200
kVA |
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PCEN
Series |
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AC Power Conditioners |
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Single &
Three Phase |
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2 to 200
kVA |
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Back
to Top |
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The
design technology utilises a simple, yet highly
reliable, rotor and stator design principle to
increase or decrease the magnitude of the
voltage in a series transformer winding, which
thereby delivers and maintains a constant
voltage. |
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Unlike
the Servo-Electro Mechanical design, this
technology does not require carbon brushes and
there is no contact wear. As a result Magnetic
Induction based stabilisers are highly reliable
and can be viewed as virtually maintenance free
solutions. |
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Design
Advantages |
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Design
Disadvantages |
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High output voltage
accuracy |
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Less price
competitive when compared to Servo Electronic
design
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High reliability |
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Virtually
Maintenance Free with no contact wear or
requirement for carbon brush replacement |
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Ashley-Edison Magnetic
Induction Solutions |
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MVSI Series |
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Air Cooled |
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Three
Phase |
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500
to 2000 kVA |
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IVSI Series |
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Oil Immersed |
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Three
Phase |
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500
to 2000 kVA |
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Available for only
larger Three Phase applications above 500 kVA,
we offer two ranges of Magnetic Induction based
voltage stabilisation solutions – MVSI Air
Cooled and IVSI Oil Cooled solutions.
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As standard
Magnetic Induction based stabilisers offer independent phase sensing / control and
are suitable for unbalanced voltages and loads
up to 100%. |
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The Oil Cooled
models offer more efficient cooling and as a
result tend to be smaller in physical size
compared to their air-cooled MVSI
counter-parts. Oil cooled stabilisers are ideal
for deployment in very humid environments. |
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Back
to Top |
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Based around a
highly reliable and endurable Constant Voltage
Transformer (CVT), super isolation design based
systems (PCV – Single Phase AC Power
Conditioners) are able to tolerate very wide
input fluctuations, even when the input voltage
drops as low as 40%, the output voltage will be
maintained at nominal voltage ±5%. |
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With no moving
parts and no electronic control circuitry there
is no need for maintenance and is virtually an
install and forgets solution. The design can
withstand high instantaneous overloads and is
able to suppress lightning induced spikes and
surges. |
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Compact in size and quiet in operation, this
design has the inherent ability to withstand a
ride-through even when there is a very short
power failure, maintaining voltage for 3msecs.
This feature is exceptionally useful for
sensitive electronic equipment when there are
frequent short breaks or sever voltage dips.
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Design
Advantages |
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Design
Disadvantages |
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High
speed of response to voltage changes |
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Not generally competitive in ratings above 10
kVA |
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Output
voltage does not collapse on overload or sever
input voltage drop |
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High weight to kVA ratio
compared to other stabilisation methods |
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Attenuates voltage spikes |
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Frequency dependent – not
ideal for where severe frequency variations are
an issue |
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Competitively priced AC Power Conditioning
solution for ratings of 5 kVA or below. |
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No
Moving parts – virtually Maintenance Free |
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Highly
reliable with extremely high MTBF performance |
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Inherent ride-through ability |
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Endurable, with long life expectancy |
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Ashley-Edison Ferro-Resonant CVT Solutions |
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PCV
Series |
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Single
Phase |
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1 to 5
kVA |
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Back
to Top |
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The Electronic Tap
Changer design principle operates by
automatically selecting one of a series of taps
on an auto transformer. |
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Design
Advantages |
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Design
Disadvantages |
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Most
competitive in price for 2 kVA and below |
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