What Are 3 Phase Transformers?

11th July 2016

Why Are They Used? Transmitting electricity at high current levels and low voltage is an expensive process. Transformers play a crucial role in electrical distribution systems. Utility companies distribute electricity to large areas using high voltages. When this electricity gets to the end point (your office or factory), it is converted to lower voltage with the help of transformers. Transformers are used to convert the voltage from the utility company to the voltage required to operate equipment in your premises.

What is Three Phase Power? Before we can understand 3 phase transformers, it’s essential to understand how the power companies generate electricity. The utility company has generators that produce electricity by rotating three windings or coils through a magnetic field. Each coil or winding is displaced at 120 degrees from each other. As these coils rotate through the magnetic field, they produce power, which is transmitted on three lines, which is nothing but 3-phase power.

Three phase transformers should have three windings or coils conjoined in the right sequence so as to match the incoming power, and eventually transform the high voltage produce by the utility company to the level of voltage required in the premises.

What Are 3 Phase Transformers? Transformers are essentially of two kinds, single phase and three phase. When we say single phase transformers, it means that you only need one conductor (consisting of one primary and one secondary winding) to transform the voltage received from the utility company. Three phase transformers consist of three conductors. That is, they contain three sets of primary and secondary windings.

It’s as if three single phase transformers share a joined core. Three phase transformers are much more economical when it comes to supplying large load. Be it the industrial sector, power generation or power distribution, three phase transformers are the preferred choice.

Advantages of 3 Phase Transformers

  • They use much less conductor material when compared for transmitting power to single phase transformers at the same voltage. For this reason, they cost much less to build when compared to a bank of single phase transformers.
  • Since they use less material, they are also much lighter and compact, and weigh less.
  • A three phase transformer makes use of three conductors to carry current, which results in a much more balanced load thereby providing a lot more power than single phase transformers.
  • Three phase transformers are highly reliable and operate smoothly and efficiently too.
  • If and when a fault occurs in any coil of a 3 phase transformer, the other two coils can be used to serve the 3 phase load. This is not possible in case of single phase transformers. This makes three phase transformers much more reliable.
  • Quick to assemble.
  • Easy to install and repair.
  • It’s possible to supply single phase power supply on a 3 phase transformer, but it’s not possible to supply three phase power from a single phase transformer.

How to Size Transformers? So how do you determine transformer size? Calculate voltage, power and current. You will require ‘turns ratio’, total load and primary voltage of the transformer to carry out this calculation. Secondary voltage is essentially primary voltage divided by ‘turns ratio’. Secondary current can be calculated by multiplying current ratio by the turn ratio. The power the transformer receives will be more than the power coming out of the transformer.

Choose AM Transformers AM Transformers are leading manufacturers of 3 phase transformers in UK. Manufactured to the highest standards, we bring to you high quality 3 phase transformers. We manufacturer 3 phase transformers of all sizes (up to 750 KVA) customised to your requirements. Customers trust us for our fast delivery, excellent prices and high quality products. Call us for custom designed transformers that meet your requirements.

Ferrite Beads

22nd March 2016

Ferrite Beads

Ferrite Beads MaufacturersA ferrite bead, or ferrite choke, is a simple hollow cylinder or bead that is made of – surprise, surprise – ferrite material. Ferrite is a black semi-magnetic crystalline structure that gives steel and cast iron their magnetic properties and it is a passive electric component that is used to filter and suppress the amount of high frequency electromagnetic interference (EMI) found in electronic circuits. Cylindrical in shape a ferrite bead consists of a mixture of iron oxide and other metals such as manganese, zinc, copper and nickel in various combinations. The material is formed into a hollow cylindrical core and cooked. The resulting core material is easily magnetized and demagnetized and is called a soft ferrite, however, ferrite material is mechanically rigid and brittle and can chip and break if mishandled, so they are encased in rubber or plastic material to protect them and keep the ferrite bead in place.

Also known as blocks, cores, rings, EMI filters, or chokes there are several different kinds of ferrite beads categorized by maximum DC resistance, case size / dimension, rated current, impedance, operating temperature range and packaging type, but the most common sizes for impedance are 120 Ω, 220 Ω, 600 Ω and 1kΩ.
Many ferrites are electrically non-conductive. In these types of ferrites eddy currents do not flow through the material which makes them suitable for use on radio frequencies in transformers, inductors, baluns and loopstick antennas.

How Do Ferrite Beads work?

A ferrite core or bead can be used in two separate ways to improve its ability to block unwanted electromagnetic interference.

In one instance, the ferrite concentrates the magnetic field which increases inductance and therefore reactance. This impedes or ‘filters out’ the noise. In the other instance, the ferrite can produce an additional loss in the form of resistance within the ferrite itself. The ferrite creates an inductor with a very low Q factor. This loss does create some heat within the ferrite, but it is negligible. When the electromagnetic levels are high enough to cause interference, or undesirable effects in sensitive circuits, the energy blocked is typically quite small.

Large ferrite beads are usually found on external cabling but various smaller ferrite beads are used internally in circuits. They are fixed onto conductors or around the pins of small circuit-board components, such as transistors, connectors and integrated circuits. Ferrite beads can be used for the removal of power line noises in cellular phones, PCs, TV tuners, audio players, DVDs, game machines, digital photo frames and several other electronic circuits.

Manufactured to international and UK safety standards, Am Transformers consider their ferrite bead production a speciality, so contact them today to discuss your requirements.

What is an EMI Filter?

8th March 2016

What is an EMI Filter?

EMI stands for Electro Magnetic Interference and an EMI filter is a vital part of any piece of electronic equipment. They are either a separate device or they are embedded into the circuit boards. An EMI filter, is an electronic device used to suppress interference that is present on a signal or power line. They can be used to suppress interference that is generated by the device they are connected to or by other equipment in proximity in order make that device more immune to electromagnetic interference signals present in the environment.
EMI filter

What is electromagnetic interference?

Electro-Magnetic Interference, is defined as unwanted electrical signals and can be in the form of conducted or radiated emissions. It is the interference caused by an electromagnetic disturbance affecting the performance of a device, transmission channel, or system. All integrated circuits are a potential source of EMI. EMI is either conducted – in which there is physical contact between the source and the affected circuits or radiated – which is caused by induction.

This interference can affect the performance of electronic equipment nearby. Equipment such as cordless telephones, home entertainment systems, computers, and certain medical devices can fail to work properly in the presence of strong electromagnetic fields.
Problems with EMI can be reduced by ensuring that components such as EMI filters are installed. EMI filters can suppress any interference that is generated by the device or by other equipment in order to make a device more immune to electromagnetic interference signals present in the environment.

Why do we need EMI Filters?

There are regulatory standards in most countries that limit the amount of high frequency electromagnetic interference that can be emitted by a device and EMI filters function to help maintain or reduce this level.

In addition to assisting to meet EMI regulations, the filter also has to meet a number of safety standards to reduce the risk of fire and electrical shock. AM Transformers have over 20 years’ experience in the industry and you can be certain that our products meet all standards.
There are many different kinds of EMI filters. At AM Transformers we supply custom and standard common mode EMI line filters which are designed to prevent noise emission in switching power supplies at input and to prevent high-frequency noise in communications equipment such as facsimiles, etc.

Contact us today.

Cast Resin Transformers

1st February 2016

Cast Resin Transformers Out Perform Oil Based alternatives

Cast Resin TransformersTransformers are electric equipment that change the voltage and the current of electricity for effective and efficient transmission and distribution. They have a multitude of uses but a good example of their use is in power generation facilities.

Transformers are used to increase the voltage and to decrease the current in order to transport electric energy across transmission lines. When the electricity reaches the end user, transformers are again used to then reduce the voltage and to increase the current in order to make the electricity suitable for general use. This process of transforming voltage generates a lot of heat and therefore transformers must contain effective cooling systems.

It is these cooling systems that differentiate transformers from each other, for example dry type transformers dissipate heat directly into the ambient air and liquid cooled transformers dissipate heat into liquid mediums.

Cast resin power transformers are so called because they use epoxy resin to encase the windings. First developed in the 1960s in Germany as an alternative to oil-filled transformers they are able to withstand temperatures as high as 188 degrees Celsius. Heat passes through the epoxy and dissipates into the surrounding air.

Cast-resin power transformers are self-extinguishing, so guaranteed against fire hazards and require no fire-proof vault for indoor installations; totally insensitive to harsh environments because the epoxy protects the windings from dust and corrosive atmospheres, whether that be pollution or condensation; certified silicone free and because these transformers are dry, without cooling oil they are quick and easy to install with minimum maintenance required.
The applications for cast-resin power transformers are varied – from a wide range of infrastructure, commercial, public and residential developments to stepping down the voltage of electricity from the electric grid to lower levels. While oil-filled transformers are still widely used throughout the world, cast resin transformers are increasing in popularity because they offer better efficiency, less maintenance, higher fire resistance, and are more environmentally friendly due to the lack of cooling liquids which eliminate the possibility of oil leaks.

AM Transformers are a global leader in the field of electrical power equipment and we supply a collection of Cast Resin Power & Distribution Transformers with the choice of both recently manufactured and re-engineered solutions available. Our Cast Resin Transformers are supplied in accordance with internationally recognised standards and are designed to suit your requirements either in IP00 specification or in sheet steel ventilated enclosures complete with HV and LV cable boxes.

Voltage Stabilizers

13th January 2016

What are Voltage Stabilizers?

Simply put, voltage stabilizers are electrical appliances used to feed a constant voltage current to electrical gadgets like ACs and computers. They are an effective way to avoid voltage fluctuation issues from wreaking havoc on your electrical equipment.

Why do we need Voltage Stabilizers?

Voltage Stabilizers Electrical AppliancesIn a world where the use of electronic equipment is second nature, line voltage stabilizers are becoming an ever increasing necessity to most households in order to keep a near constant voltage supply for the efficient operation of your electrical goods. Even though you may not be currently experiencing the negative effects of voltage variations, it does not mean that your unit is free from issues. Your supply may be full of variations, it’s just that there hasn’t been one serious enough to trigger a shut down – yet!

Most pieces of electrical equipment require a constant voltage supply of 400V to run efficiently. Higher voltages may not cause a failure per se, but it can lessen the durability of the product considerably. Light bulbs for example are able to consume up to 40% more power at high voltage but they will last for a mere 10% of their normal life.
Having a voltage stabilizer will ensure that your electrical equipment is performing at its best and does not get overloaded by any voltage spikes in the system.

How do Voltage stabilizers work?

Voltage stabilizers work on the principle of a transformer, where the input current is connected to primary windings and the output is received from secondary windings. When there is a drop in the incoming voltage, it activates electromagnetic relays which add to more number of turns in the secondary winding giving a higher voltage which will compensate for the loss in output voltage. When there is rise in the incoming voltage, the reverse happens, and, thus, the voltage at the output side is always almost unchanged.
AM Transformers voltage stabilizers are designed to accept a wide range of input voltage but maintain a specified output voltage to within +/- 1.0% for both three phase and single phase supply.
If you have any questions please contact our team of friendly, enthusiasts who have been in the industry for many years and they will be happy to help you

PCB Mounting Transformers

7th January 2016

A surface PCB mounting transformer is specifically designed to work on a printed circuit board.

They are compact, they are reliable and they are long lasting – so long as they are treated properly. The first printed circuit boards that most users would probably have seen had wires on them, with the components sticking through the printed circuit board and more often than not being connected underneath it via wires.

As technology has advanced over the years, the way they are constructed has changed many times. The technological leaps of the past decade have seen the complexity of the circuits that are able to be fitted on a printed circuit board increasing tremendously. Because they have no pins or other components that penetrate through the printed circuit board itself they can be designed to a much more compact spec which is one of the reasons they have become the preferred way to affix any type of an electronic component to a printed circuit board in recent years and now surface mounted components have become the norm.

PCB mounted transformers are generally found somewhere above the surface of the circuit board, providing whatever voltage transformation or current transformation that may be required. They do not have sophisticated cooling mechanisms, so they tend to come with a rating for the maximum and minimum temperatures at which they should be run. So long as you keep between these ranges your printed circuit board PCB mounting transformer should last for many decades.

These PCB mounting transformers come in a variety of different capacities and sizes, ensuring that there are enough options for just about any imaginable product. Mounted PCB transformers tend to be inexpensive parts, which helps make printed circuit boards even more economically viable as a means to produce electronic components. Used in a variety of different applications, PCB transformers can step the voltage down to a safe level which makes them indispensable. Constructed on high quality double section metric bobbins designed to meet international standards, our PCB mounted transformers are fitted with modern pin terminals for a level of reliability you can trust.

With next day delivery and a bespoke service that offers our customers the ability to design to order for their specifications as well as those manufactured to designs and specifications that meet the insulation requirements visit us today for your PCB mounting transformer.

Electrical Safety; Complying with British Safety Standards

3rd November 2015
Electrical Health & Safety Assurance

Electrical Health & Safety Assurance

Controlling voltage using custom transformers and other voltage optimising devices can help with energy efficiency as part of an energy management strategy or simply to help reduce your utility bills through lowering the energy consumption of large electrical appliances.

However, inadequate control or improper use of electricity is a danger to property, equipment and more importantly, life.  Therefore,  in order to enforce electrical safety, it is crucial any electrical device, such as a three phase transformer, is installed properly and has been manufactured to UK and International Safety Standards. This helps ensure safe management, design, installation, operation and maintenance of electrical systems with a greater level of control and accountability.

What are safety standards?

Safety standards are set criteria prescribed by an advisory or regulatory body to ensure the safety of products or procedures. International and British safety standards are critical when designing electrical products that convert high voltage, such as step up and step down transformers because they ensure the minimal acceptable level for health and safety. The British Standards Institute (BSI) is the UK’s National standard’s body, providing standards for accessing risks and helping to shape robust safety strategies with consistent processes and procedures.

Why safety standards can help increase first time fix rates

Common standards in the transformer industry help define product quality and safety requirements. This helps reduce non-conformance issues that can demand design iteration and additional cost. Therefore, purchasing transformers that have been, manufactured to approved standards, increases the chances of successful first time installation.

Custom Transformer and Special Requirements

As a UK transformer manufacturer and distributor, we not only manufacture transformers to UK and International Safety Standards, we can also design and build any sized transformer within a broad range of transformer types. This includes various input and output voltages, currents, taps and number of separate windings.

What’s more our fast turn around, with next day delivery available on standard stocked transformers, ensures you have the right quality product for your voltage need with increased efficiency – ideal if you have a breakdown situation.

If you have a specialist requirement why not contact our technical team online or would like more information about our professional services, please call us on 01494 524 396.

How to save electricity & reduce base cost with custom transformers

8th October 2015

Save electricity through strategic planning  What is 3 phase power?

3 phase power is harnessed by most electrical grids worldwide for electric generation, transmission and distribution. By carrying 3 alternating currents of the same frequency and voltage (each phase synced to reach its peak at one third of a cycle), 3 phase power provides consistent power delivery which is highly efficient and subsequently hugely economical.

This is largely attributed to the reduction of energy loss during transmission.

The same cost benefits of using 3 phase electricity to control energy loss and achieve voltage optimisation can be leveraged in industrial and commercial applications, through the installation of step up and step down transformers. Such electrical devices convert a high energy supply into a lower energy supply or vice versa.

This gives industrial users the flexibility to vary power delivery, ensuring large equipment such as motors (compatible with three phase power) run on optimum performance and greater energy efficiency. This is especially applicable for industries who rely on heavy duty equipment with high energy consumptions to sustain their business processes. The strategic use of 3 phase transformers can also support energy management systems, introducing an effective cost control measure.

This is because with the right three phase transformer connections, you can minimise energy wastage and sustain consistent power delivery of optimised voltage.  This control mechanism helps save electricity whilst helping to preserve the integrity of your machines to enable longevity.  

With rising energy bills this can be a critical factor in helping you drive down your base cost.    Made to order custom transformers may be the solution for businesses with specialist needs whilst other businesses may simply require standard electrical transformers to step down or step up voltage. Either way, all our transformers are manufactured to UK and international safety standards and are available with fast delivery. With over 20 years experience, our products help businesses across many industries, operating in both the public and private sectors, get the most out of their energy supply.

Talk to our technical department today to see how we can help your business become more energy efficient.  Call us on 01494 524396 or enquire online today!

Industrial energy efficiency: innovative power saving solutions

17th September 2015
Planning a greener business

Planning a greener business

25% of the UK’s total CO2 emissions are produced by industry, with electricity making up half of the main energy used.

With many industries relying heavily on energy intensive equipment such as motors and lighting in their business processes, high energy consumption can appear an unavoidable cost of business.

This is not the case. By leveraging power saving technologies such as voltage optimisation devices and energy efficiency components; it is possible to significantly reduce the amount of energy required to power industrial processes.

This means manufacturers wanting to take action to reduce energy consumption, businesses looking to design and implement an energy management system, or companies simply looking to boost their green credentials, can all take steps towards better energy efficiency and a reduced carbon footprint.

For proven and reliable methods of reducing your power consumption, we recommend starting with power optimisation devices such as three phase transformers or single phase transformers which can be used in public, commercial and industrial sectors and have been proven to save up to 20% on energy bills.

Our A.M. Transformers team have in excess of 20 years of experience in the electrical transformer industry and have a proven track record of collaborating with the industry sectors to deliver high energy savings. Through identifying opportunities to incorporate power saving devices into your business processes, we aim support greener practices that are good for both your business and the environment.

With an in-depth knowledge of high energy flows and voltage optimization technology, we are able to provide expert technical support and can manufacture virtually any size of single or 3 phase transformer. This ensures you purchase the best product for your application, so you can benefit from instant savings and continue to save far into the future.

If you are looking to reduce your energy consumption, our technical department will be happy to advise you on the best transformer type to fulfill your business requirements.  Call us on 01494 524396 or enquire online today!

How to save electricity and improve your energy efficiency

27th August 2015
Improving home efficiency

Improving home efficiency

Home appliances such as refrigerators are one of the biggest consumers of electricity in a household.

Chances are, if your home appliances are more than 10 years old, they may be keeping your running costs and energy consumption higher than many modern electrical appliances. This is because most modern models are designed to be more power saving and energy efficient to meet the demands of increasingly eco-friendly households.

Although switching to energy efficient appliances can help you save money on utility bills, many households can’t afford to replace all their appliances in one go. Therefore, it may be worth reviewing your current electric appliances and replacing the ones that guzzle the most energy. You can do this by using an energy cost calculator to work out the yearly running costs of your fridge-freezer, dishwasher, washing machine or electric oven.

By comparing your current machines with newer models on the market, you can identify opportunities to reduce energy consumption and cut your energy bill. You can find energy cost calculator tools online – many of which are free and easy to use!

Energy efficiency rating

Many showrooms display white goods and other home electrical appliances with EU energy efficiency labels. These labels are designed to show customers the energy efficiency rating of a model, which is great if you’re looking to replace your old appliances for cheaper to run and greener alternatives.

Using the EU energy-efficiency rating to compare models

The EU label rates the product based on its energy consumption, with A+++ being the most energy efficient and D being the least efficient. The label also lists the annual energy consumption of the product along with other specific product information that will help shoppers find the right electrical appliance for their needs.

Washing machines, tumble dryers, fridges, freezers, electric ovens, air conditioning and energy saving light bulbs commonly feature energy efficiency labels, however they are not comparable across different appliances as the EU rating has been calculated specifically for that appliance range.

Energy-saving products

If replacing your home appliances isn’t an option, there are still ways you can reduce your utility bill. Energy-saving products such as CFLs (compact fluorescent lamp) are 4 times more energy efficient than incandescent light bulbs and are widely available.  Such small changes can make a big difference in the long run, providing ways to save electricity and reduce your electricity bill.

Our aim at AM Transformers is to provide the right information and support to streamline your energy management.  As specialist UK suppliers of transformers and voltage optimisation devices, including 3 phase transformers, our whole business is founded on helping you reduce energy wastage and money spent on unused electricity.

For advice on improving your energy efficiency, why not give our energy experts a call today on 01494 524 396 or click here to enquire online.