TMC Transformers

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TMC Transformers: your global strategic partner specializing in the design and production of medium and low voltage dry-type transformers, available in both standard ranges and tailor-made versions, based on cast resin technology - up to 25MVA and 36kV in class F (155°C) or class H (180°C); and VPI - up to 15MVA and 150 kV BIL.

Product Range

Cast Resin Distribution Transformers

TMC Transformers manufactures cast resin standard distribution transformers suitable for both indoor and outdoor installation; both standard and reduced losses resulting in high-efficient dry type transformers, from 50 kVA to 25000 kVA with system voltages up to 52 kV.

We offer both aluminium and copper-wound solutionas each available with Class F (155) or Class H (180) insulation systems. TMC offer solutions for Indoor and outdoor installations.

TMC products are designed and manufactured to offer long term reliability, minimum maintenance and in accordance with all national and international standards.

The ability to withstand short circuit forces is checked with FEA software.

Combination of Cast Resin and Foil winding offers the ultimate in terms of dielectric performance and short circuit withstand.

Cast Resin Special Transformers

At TMC we use or vast experience and expertise to work with our customers to develop specialist solutions, designed specifically to suit their requirements – up to a power rating of 25MVA at a system voltage of 52kV for a wide variety of applications, across a multitude of sectors.

TMC draws on its considerable know-how to assess the ability of products to withstand short-circuit forces (FEA analysis) and manage:

  • very high currents (> 30kA)

  • cooling - not only with natural or forced air, but also with direct or indirect water

  • installations in particularly polluted or outdoor environments by studying and developing suitable solutions

  • the combination of epoxy resin and foil winding ensures the ultimate in dielectric performance and short-circuit resistance

  • aluminium or copper winding

  • available in Class ‘F’ (155°C) or Class ‘H’ (180°C) resin systems

  • air cooling channels included in the coil for better thermal efficiency at power ratings greater than 5 MVA.

VPI Medium Voltage Transformers

TMC produces medium-voltage VPI distribution transformers and special transformers with powers up to 25 MVA and voltages up to class 36-70/170 kV. These products are typically required in thermal class 180°C or 220°C.

The insulating material is composed of aramid materials applied with double VPI cycles which perform well at maximum working temperatures and in the event of extreme thermal overloads.

The ability to withstand short-circuit forces is verified with FEA software.

The thermal class of the resin is the same as that of the insulating materials.

VPI Low Voltage Transformers

TMC produces special and distribution VPI transformers with normal or reduced losses and according to customer specifications, up to 10 MVA and with insulation class up to 1.1 kV.

We design, manufacture, and test our machines according to all international standards: IEC, IEEE, CSA, UL, ANSI, NEMA, NRCan.

VPI transformers main feature:

  • aluminium or copper windings

  • class F (155°C) or class H (180°C) resin systems

  • compatibility with both indoor and outdoor installations.

The most common cooling technologies are based on air, either natural or forced, and liquid, either direct or indirect, or with an AFWF heat exchanger.

In addition, the ability to withstand short-circuit forces is verified with FEA software.

Application

Industrial Application

Transformers and reactors used for these applications have particularly robust construction characteristics from an electrical and mechanical point of view as high corrosion resistance. TMC has the ability to handle up to 50 kA using fluid cooling technologies. See a couple of sample applications below:

GAS PUMPING STATION

  • Power 9MVA

  • Primary Voltage 33kV 50Hz

  • Secondary Voltage 6 x 2kV

  • Protection IP44

  • Cooling AFAF

  • Weight 23.500kg

INDUSTRIAL CRANE

  • Power 950kVA

  • Primary Voltage 13,8kV 60Hz

  • Secondary Voltage 0,415kV

  • Protection IP23

  • Cooling AN

  • Weight 2.900kg

HYDROPOWER PLANT

  • Power 100kVA

  • Primary Voltage 0,4kV 60Hz

  • Secondary Voltage 0,525kV

  • Protection IP23

  • Cooling AN

  • Weight 450kg

Power Generation Application

For both LV and HV applications systems efficiency and compact size are crucial. Our in house FEA design facility allows our engineers to study complex electro-magnetic circuits as well as the structural and thermal performance enabling us to provide the required level of reliability in the finished product.

PHOTOVOLTAIC FARM

  • Power 1250kVA

  • Primary Voltage 20kV 50Hz

  • Secondary Voltage 2 x 0,2 kV

  • Protection IP00

  • Cooling AN

  • Weight 3.900kg

OUTDOOR AUXILIARY TRANSFORMER

  • Power 200 kVA

  • Primary Voltage 11 kV 50Hz

  • Secondary Voltage 0,433kV

  • Installation Outdoor

  • Protection IP56

  • Cooling AN

  • Weight 6.500kg

HYDROPOWER PLANT

  • Power 1500/2000kVA

  • Primary Voltage 11kV 50Hz

  • Secondary Voltage 0,69 kV

  • Protection NEMA 3R

  • Cooling ANAF

  • Weight 5.000kg

Data Center Application

TMC Transformers SpA offer a wide range of dry type transformers for use in data centers:

  • Dry type transformers with ratings up to ≤ 25 MVA and 52 kV insulation systems

  • Advanced Technologies: Cast Resin, VPI, fibreglass encapsulation

  • 155 (class F) & 180 (class H) thermal insulation classes

  • AN (air-natural), AF (air-forced) & WF (water-forced) cooling technologies

  • Medium voltage distribution transformers for auxiliary services

  • Low voltage isolation transformers

  • Short-Circuit Tested

DEMANDING APPLICATIONS

Data centers are a highly demanding application. Standard designs are not robust enough to cope with such demanding power systems. Non-linear switch mode power supplies generate harmonic currents (up to K20 factor is possible) which can cause transformers to overheat and deteriorate the insulation system. Several and sudden switching operations are also challenging factors for the design of transformers for data centers. Due to special designs of data centers, with high density of equipment installed in the available space, outages as a result of premature equipment failure can be extremely costly. For this reason, it is important to ensure functionality and reliability of the transformers.

TMC TRANSFORMERS ULTIMATE SOLUTIONS

The H-ART dry type transformer technology, developed by TMC Transformers SpA, is ideal for this application: an upgraded class H insulation system that is based on advanced resin technology combined with lower temperature rise, able to improve the performance of the transformer and the lifetime expectancy. This technology was developed specifically to cope with harmonic content, offer superior mechanical, thermal and dielectric strength and be highly efficient in operation. The space constraints within a data center environment also makes the compact design of TMC Transformers the perfect solution.

COMPLEMENTING THE PORTFOLIO

TMC Transformers SpA completes the portfolio for data centers with isolation dry type transformers. Low voltage transformers with designs able to cope with harmonic distortion equivalent up to K20 factor. TMC’s portfolio includes a variety of accessories such as snubbers (R-C filters), surge arresters with different configuration and pre-mag systems to mitigate the current and voltage transients. Pads or dumpers can be provided to mitigate the airborne noise and structure borne noise. All transformers are designed according to international standards with rigorous criteria, validating the designs through finite element analysis in both the electrical and mechanical parts.

About the company

The TMC team of highly specialized and qualified technicians developed a wide range of products and services, whether for distribution or all manner of special applications. These two different aspects combined under one brand offer customers the technology and services best suited to varied needs and for any application around the world.

The TMC headquarters is located in Busto Arsizio, in the province of Varese. Production is carried out at three plants in Italy (Busto Arsizio, Marnate and Fabro) with a total covered floor area of 37,000 square meters. TMC, a dynamic company, has a solid global network of agents and distributors, with commercial offices in Germany, the United States and Israel among other countries.

Certifications

TMC is able to design and develop products according to both IEC AND IEEE international standards and can customize products according to the specific needs of each local market in terms of solutions and accessories.

IEC and ANSI/IEEE establish performance requirements for protection against fire and electric shock, i.e. protection of people and property. Both of the following documents cover the installation, use, and maintenance of wiring systems for premises and equipment.

IEC 60076-11

IEC 60076-11:2018 applies to dry-type power transformers with maximum voltages for equipment up to and including 72.5 kV (52 kV) and at least one winding operating at a voltage greater than 1.1 kV.

IEEE C57.12.01

The IEEE C57.12.01 standard describes the electrical and mechanical requirements of distribution and power transformers or ventilated, non-ventilated, and dry-sealed autotransformers (single-phase and polyphase) with natural or forced ventilation, dry type, with a primary voltage equal to or greater than 601 V.

  • ISO 9001:2015 - quality management system (QMS)

  • ISO 14001:2015 - an environmental management system that an organization can use to enhance its environmental performance.

  • ISO 45001:2018 - occupational health and safety (OH&S) management system

For more information on TMC Transformers, visit their website

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