Dry-type electrical transformers built in North America
WR Transformers develops, designs and manufactures superior quality transformers at its plant in Granby, Quebec. Operating in a factory of over 50 000 square feet, we build large capacity units up to 20 MVA, voltages up to 49 kV insulation class up to 220kv BIL. With more than a decade of experience in the market, our team offers you excellent technical support and service that will meet your highest expectations.
Our expertise lies in developing and producing custom electrical transformers. Our facility’s versatility and our knowledgeable personnel lend a hand in the planning and making of your next transformer.
WR transformers have been put in place across all five continents and are used to support a wide range of industries – from industrial to commercial, mining to data center, pulp and paper to aluminum smelting, and micro-networks. Other essential domains in which these transformers are used include hospitals, factories, schools, pharmacies, grocery stores and many more, requiring a secure and consistent energy source.
Furthermore, WR has been granted ISO/IEC 17025 certification for our testing laboratory, which is a symbol of quality regarding the capabilities, understanding, and dependability of the personnel and equipment utilized in the test facility. Every single transformer produced by WR is subjected to this intense testing procedure.
WR Transformers’ flexibility and the craftsmanship of our staff make us stand out when designing and producing the most robust transformers.
Standard characteristics of our general purpose electrical transformers:
- Constructed and tested to CSA C9 and C22.2-47
- From 5KVA to 2000KVA
- Up to 1000 V
- Insulation class 220 ° C
- Temperature rise 150 ° C
- Frequency 60 Hz
- Efficiency according to C802.2-2012 or DOE 2016
- 4 bolted link adjustable taps (2 X 2.5% FCAN, FCBN)
- VPI type soaking
- Mechanical connection lugs included
- Nema 1 with lifting hook on case
Core and Coil Assembly
NEMA 1 or NEMA 3R
Distribution transformers (general application)
Non-linear loaded transformer
Transformer for variable speed motor
Grounding transformer (zig zag)
The copper or aluminum coils are vacuum-impregnated (VPI) with polyester resin, ensuring perfect impregnation of the windings and insulation. The VPI coils ensure reliability and longevity for operations in hostile environments. The plugs adjustments are easily accessible by bolt-on type and located at the front. The windings are made in layers or in discs depending on the voltage level and the insulation class (BIL). For some applications, the strap can be used for winding low voltage, which minimizes eddy current losses and provides higher short circuit resistance. Our transformers are built with Class 220°C insulation class. They are UL listed products to assure a better lifetime.
The cores are constructed of high-quality grain-oriented steel with high magnetic permeability. Magnetic steel is free of burrs and neatly stacked. The magnetic flux density is kept below the saturation point, which minimizes core losses and lowers the sound level. The core is electrically insulated except for one point, where a copper strip connects the core to the yoke. The steel cutting is done with high precision vacuum-impregnated applied on the core to protect as much as possible from corrosion. For larger capacity transformers and to avoid saturation, an air gap in the middle of the core uses electrical insulation so that the air can circulate and cool it.
Core and Coil Assembly
The cores are compressed by high-density insulation blocks between the upper and lower frames to provide the best ability to withstand short-circuit forces. The transformers used in the mining sector will be mechanically reinforced to be handled by being oriented at 90 °. The standard connection type is “stub up” having NEMA-type holes with or without mechanical connectors. WR also offers the possibility of manufacturing and installing the busbars to coordinate with the low voltage (LV) and/or high voltage (HV) switches. The same services are available for adding transition rooms in, ATC Air Terminal Chamber. As an option, the addition of flexible braids eliminates the transmission of vibrations from the transformer to the switching devicesconnected to the latter. They can be factory installed and ready to be connected on-site.
ENCLOSURE: NEMA 1 OR NEMA 3R
The mechanical housings used are either NEMA 1 or NEMA 3R type and can come with filters to protect transformers from dust, water, or snow. For greater strength and longevity, the enclosure can be manufactured with a range of thicknesses such as 11, 12, and 14 gauge. We also provide stainless steel enclosures for especially corrosive conditions, such as salt air. For mining operations, these transformers can be placed on a stable metal foundation, making them easier to move and reducing the amount of work needed when connecting them to the control panel. Furthermore, we also offer a case that has no ventilation, which can withstand the harshest of weather conditions.
To facilitate joining high voltage (HV) and low voltage (LV) cables, transition chambers can be incorporated to give way to the entry of cables from the top. Moreover, to make sure that the cables are securely and conveniently installed, cable supports can be added to the transition chambers.
DISTRIBUTION TRANSFORMER (GENERAL APPLICATION)
A distribution transformer is an electrical device that is employed to reduce the voltage of an electrical power system. This is usually done to lower the voltage of a power transmission line to a level that is suitable for everyday use by the public or commercial businesses. In comparison to power transformers, distribution transformers possess a lesser MVA rating and are employed in electrical networks with lower voltage.
NON-LINEAR LOADED TRANSFORMER
A non-linear loaded transformer is a form of transformer created to transfer electrical energy from a source to a load while shielding the source and load from harm caused by current and voltage spikes. These transformers are employed in applications where the load is non-linear, such as AC/DC rectifiers, DC/DC converters, and uninterruptible power supplies. Additionally, they can be used for power conditioning and offer supplementary current and voltage regulation.
An autotransformer is a type of transformer that uses a single winding to step up and step down the voltage. It consists of a single coil that has taps along its length, allowing the user to select the required voltage ratio. It is usually used in applications where the voltage needs to be adjusted by a small amount. Autotransformers are also often used in adjustable speed drives, voltage stabilization, and other power conditioning applications.
TRANSFORMER FOR VARIABLE SPEED MOTOR
A transformer for variable speed motor is a type of transformer that is designed to control the speed of an induction motor. It contains a set of windings connected in series and parallel to the motor, which allows the user to adjust the voltage and frequency of the motor. By varying the voltage and frequency of the motor, the speed of the motor can be controlled. This type of transformer is commonly used in applications such as conveyor systems and pumps, where variable speed control is required.
REACTOR TYPE TRANSFORMER
A reactor-type electrical transformer is an inductor that controls voltage and limits short-circuit current in power systems. It comprises a coil of wire that creates a magnetic field when current flows through it. The added inductive reactance has the effect of limiting the short-circuit current from the transformer. A series reactor sometimes limits current and voltage transients and provides short-circuit protection. Shunt reactors are used to increase the power and energy system efficiency as they absorb and compensate for the reactive power in cables and long high-voltage transmission lines.
GROUNDING TRANSFORMER (ZIG -ZAG)
A grounding zig-zag transformer is a grounding transformer used to provide a source of zero-sequence current. This type of transformer consists of two coils connected in a zig-zag configuration, which helps to reduce the potential of circulating currents and improve the system’s fault current capacity. Grounding zig-zag transformers are used in power distribution systems to provide an effective ground connection and protect against electrical hazards like fire and electrocution.
A grounding transformer is a type of transformer that is used to provide a source of zero-sequence current. This type of transformer is typically used in power distribution systems to provide an effective ground connection and protect against electrical hazards, such as fire and electrocution. Grounding transformers are also used to provide a neutral point of connection for the power supply system, which can help to regulate voltage levels and protect against power surges.
A reactor transformer is a type of transformer that is used to limit the magnitude of fault currents in a power system. This type of transformer consists of a primary winding and a secondary winding, both of which are connected in series with an inductive reactance. The inductive reactance helps to limit the fault current, thus preventing damage to the system components. Reactor transformers are typically used in applications where the fault current must be limited to a low magnitude, such as in high-voltage transmission lines.
A reactor-type transformer is a type of transformer that uses an inductive reactance to limit the magnitude of fault currents in a power system. This type of transformer consists of a primary and secondary winding, both of which are connected in series with an inductive reactance. The inductive reactance helps to limit the fault current, thus preventing damage to the system components. Reactor-type transformers are typically used in applications where the fault current must be limited to a low magnitude, such as in high-voltage transmission lines.
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