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This section provides an overview for power transformers as well as their applications and principles. Also, please take a look at the list of 12 power transformer manufacturers and their company rankings.
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Engaged in research on nitride semiconductor growth using the MBE method at Waseda University Graduate School. After graduating from graduate school in 2016, he joined a non-ferrous metal manufacturer.
Engaged in equipment maintenance and engineering work at metal smelting plants. Moved to a chemical manufacturer in 2022. Engaging in similar tasks.
A power transformer is a transformer that transforms electrical AC voltage using electromagnetic induction.
The official name is transformer, but the word power transformer is already well established. Electrical products, for example, are powered by AC outlets, but there are many components in those products, such as motors, that are used with DC electricity instead of AC.
Also, many of those components that can be used in AC are too high voltage to be used with the 100V voltage from the outlet. For this reason, electrical products incorporate small power transformers for the purpose of varying the voltage and current, so that they always operate at the optimum voltage.
The primary use of power transformers is as electrical equipment for boosting and lowering the voltage of alternating current.
Larger ones are used at substations to reduce the high AC voltage values sent from power plants and other sources, while smaller ones are used as transformers to change the voltage of electrical outlets to the proper value at shavers and other overseas destinations.
Power transformers are used in a wide range of applications, both industrial and residential, and are indispensable for converting voltage values to appropriate values.
The principle of a power transformer is based on the laws of electromagnetic induction.
It is based on the physical phenomenon that the electromotive force, due to the magnetic field fluctuation generated in a coil, is proportional to the number of turns of the power transformer. Power transformers generally consist of two coils wound around an iron core, with the primary coil on the input side and the secondary coil on the output side. The coil generates an electromotive force by changing the strength of the magnetic field within the coil; applying an AC voltage to the primary coil generates a magnetic field in the iron core, and the electromagnetic induction effect of this magnetic field induces a current in the secondary coil, generating an electromotive force.
The magnitude of the electromotive force generated in the secondary coil and the number of coil turns are in a proportional relationship, and the magnitude of the voltage can be changed by the number of turns of the secondary coil relative to the primary. In an ideal Power Transformer, the capacitance of the input and output sides should be the same, but in reality, there is a power loss due to resistance, which is mostly dissipated as heat.
Power transformers are used in AC commercial power supplies to isolate the power line from the equipment power supply to ensure safety.
Power transformers with INPUT: 100V / OUTPUT: 100V are used for equipment whose power supply is 100V AC. The commercial power supply is 100V or 200V AC power, but the power supply from the power company is a much higher voltage power source up to the nearest column transformer, which is grounded by taking out 100V in the positive and reverse phases at the secondary side of the column transformer and 0V at the neutral line. If a leakage current occurs in equipment that does not use power transformers, the leakage voltage of 100 V to ground is applied to the equipment, and if a person touches the equipment, he or she will receive an electric shock. In such cases, Power Transformers can prevent electric shock by insulating both the 100V side and the neutral wire side from the 100V side and the neutral wire side of the commercial power supply.
Power transformers are installed on utility poles, which are often seen in the city, in addition to holding the power lines that supply electricity. Power transformers may be installed slightly below the low-voltage lines.
The power transformer receives 6600V from the high voltage line and supplies 100V to the low voltage side. The low-voltage side (secondary side) has a positive-phase 100V and a reverse-phase 100V, so that 200V can be obtained between the positive and reverse phases (single-phase 200V / voltage to ground is 100V).
The high-voltage lines on the poles transmit power at 6600V, but even higher voltages are used on the towers that transmit power over longer distances. The reason for transmitting power at high voltage is to reduce transmission losses. Electric wires have electrical resistance, albeit slight, and voltage loss occurs in proportion to the current flowing through them. To reduce transmission loss, it is necessary to reduce the current as much as possible, and power is transmitted at a high voltage to maintain a constant transmission power.
Silicon steel or amorphous steel is used for the internal iron core of power transformer structures, but because of the higher cost of amorphous steel, a laminated iron core made of stacked silicon plates with a silicon content of about 4% and a thickness of 0.35 mm is often used.
Power transformer coils can be single or double wound. Double winding is usually used because the primary and secondary coils can be insulated, but single winding is sometimes used for reasons such as larger size and higher cost.
Power transformers need to be cooled to prevent heat generation due to voltage conversion losses. Power transformers, for this purpose, are oil-filled transformers or dry-type (molded) transformers. The former is cooled by soaking the inside of the transformer with insulating oil, while dry or molded Power Transformers that incorporate a cooling mechanism using varnish or epoxy resin are widely used in hospitals and office buildings from the standpoint of disaster prevention.
*Including some distributors, etc.
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HALO, founded in Santa Clara, CA, in 2007 is a manufacturer of electromagnetic components and power magnetics. The company's product portfolio includes solenoids used to convert electrical energy into linear motion, Electromagnetic Coils used for magnetic field generation, power transmission, and sensing, Transformers, Inductors that store energy in a magnetic field, used in electronic circuits to manage current flow, reduce noise, and improve signal quality and Magnetic Sensors. The company serves industries such as Oil and Gas, Aerospace and Defense, Automotive and Transportation, Construction, and Power Generation.
Tried Magnetics was founded in the 1940s and is based in Perris, California. The ISO 9001:2015-certified company serves industrial equipment, renewable energy, medical equipment, and other industries as a manufacturer of components using standard and custom magnetic components including transformers, power supplies, and inductors. The company’s custom magnetics division encompasses power and audio transformers, chokes, and power supplies used across industries. The company’s engineering development kits and design sample kits include a sampling of power ranges, sizes, and packaging styles within specific product lines to assist customers in choosing final designs for prototyping.
Bel Fuse Inc. was founded in 1949 and is currently headquartered in Jersey City, New Jersey. The company designs, manufactures and distributes electronics and connectivity devices to global markets including telecommunications, commercial aerospace, transportation, and high-speed data transmission. The company sells products in 16 product segments, including optical connectivity, electrical connectivity, magnetics, power supplies, and others. The company also offers an online resource library for product configuration assistance including technical aspects and drawings, video libraries, and assembly instructions.
MTM is a manufacturer of power supplies and transformers that was established in 1990, in Germany. The company deals in AC/DC Power supplies, converters, battery chargers, transformers, and more and the company uses thermoselective vacuum encapsulation technology for its products which is their patent design. These Vacuum Encapsulated Power modules have applications in the railway, transport, power plants, chemical, and telecom industries along with use in e-mobility, special vehicles, industrial robots, and safety-conscious areas such as petrochemical drilling platforms.
Tamura Corporation was founded in 1924 in Tokyo, Japan as Tamura Radio Store, making it one of Japan’s oldest electronics companies. Today the company serves the semiconductor, audio consumer appliance, power distribution, and other industries as a developer and manufacturer. The company’s Electronic Component segment has eight categories, among them, transformers, reactors, vacuum tube type power supply transformers, current sensors, and AC adaptors. The company’s Information Equipment segment has 3 subcategories including broadcast studio systems, communication systems, and network systems.
GT elektronik, founded in Bayern, Germany, in 1984 is a manufacturer of customer specific inductive components such as transformers, coils, and chokes. The company's product portfolio includes HF Transformers, tape Wound Cores, converters, power metering for energy solutions and sensors. The company serves industries such as Oil and Gas, Aerospace and Defense, Automotive and Transportation, Construction, and Power Generation. They also provide services including product selection, installation, preventative maintenance, troubleshooting, and repair.
Louth Transformer Company Limited is a company established in 1976 and based in Louth, England, as a manufacturer of electrical transformers. It specializes in manufacturing PCB mounted, three-phase auto, control panel, portable tool, and cased autotransformers. It also manufactures transformer cases, transformer rectifiers, clamp and frame transformers. The company is CE-certified and in compliance with the RoHS standards. Its manufactured products are utilized in oil and gas, power generation, industrial, transportation, and railway signaling sectors across the UK.
Atesys-Montoux, established in 1987 and headquartered in Montoux, France, is a manufacturer of electronic components and solutions for power applications. Its product range includes power capacitors for voltage stabilization, transformers, inductors for energy storage, electronics for power such as converters and control systems, as well as customized solutions. These offerings cater to industries such as power generation, transmission, renewable energy, industrial automation, and the medical sector. The company also provides services like high voltage testing, thermal tests, and high voltage tests.
Li Tone Electronics, established in 1986, is a manufacturer and supplier of electronic components and power supplies, headquartered in New Taipei City, Taiwan. Their product range includes high-frequency transformers, power inductors & coils, AC/DC adapters, and LED drivers. These products can be applied in industries such as telecommunications, consumer electronics, industrial automation, and automotive. Li Tone Electronics is certified with ISO 9001 for quality management and ISO 14001 for environmental management.
Noratel has been known as a manufacturer of transformers and reactors since 1925 and is headquartered in Hokksund, Norway. The company's product list includes various transformers such as isolating, 3-phase, medical, current, and Vario variable, along with DC-power supplies, chokes, and reactors. They provide component solutions for the renewable energy industry and these products combine with other electrical systems to serve the medical sector. The Automation department such as robotics, welding, lifts, and escalators along with Motor drives, trains, and railway and ship and offshore are a few other industries that benefit from Noratel's products.
Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
3 | 27.3% |
|
Germany
|
3 | 27.3% |
|
Japan
|
2 | 18.2% |
|
United Kingdom
|
1 | 9.1% |
|
France
|
1 | 9.1% |
|
Taiwan
|
1 | 9.1% |
190 products found
190 products
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■Made in Japan transformer with improved safety TA-350 is a transformer that allows electrical products made in Japan to be used overseas. If you a...
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