Liquid-Filled Transformers

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1 Liquid-Filled Transformers Custom Transformers at Standard Prices NIAGARA TRANSFORMER CORP.

2 Induction Furnace Transformer Cycloconverter Rectifier Duty Transformer Arc Furnace Transformer Full Range of Capability The strength of is our ability to understand customers requirements and to respond by providing transformers that meet these demanding specifications. Niagara Transformer produces liquid-filled transformers up to 20 MVA and 69 kv high voltage (350 kv BIL) either with oil filled, R-Temp, beta, alpha, ester, Envirotemp, or silicone fluids. Depending on the application, we offer conventional liquid-filled, sealed tank, conservator, or positive pressure nitrogen systems. Our transformers are built using copper, aluminum windings with circular, rectangular, or disk-style coil construction. Niagara provides transformers with manual and motorized de-energized tap changers and with load tap-changing equipment. We can also provide transformers with radiators, forced oil air, forced oil water, or oil natural water-cooled heat exchangers. Applications Process/high current rectification Traction duty Motor drive duty Primary unit substations with integrated primary and secondary switchgear Arc or induction furnace Test Retrofit Types of Transformers Rectifier transformers Unit substation transformers On-load tap-changing transformers Multi-tapped transformers Auto transformers Scott-connected transformers Pad-mount transformers Sealed liquid-filled transformers Design Styles Transformers can be designed to accommodate the following: Variable frequency motor drive Compartmentalized pad-mount Autotransformer Motor starting Corrosive/hazardous environments High ambient temperature/elevation Indoor/outdoor Dimensional restrictions

3 Unit Substation Power Transformer Forced Oil Cooled Power Transformer with Primary Switch Regulating Auto-Transformer with On-Load Tap Changer Built to Your Requirements By providing you with the exact configuration your transformer requires, Niagara Transformer minimizes the time and cost of field installation. There are no standard models at Niagara Transformer. Our design approach ensures that you receive exactly what you need at a competitive price. We can provide transformers with these specialized options: Coordinated HV and LV termination location Coordinated HV and LV elevation Special dimensions Special arrangement Nonstandard kva Nonstandard voltages Nonstandard BIL Nonstandard sound levels Special impedance (low or high) Special termination arrangements Low operating temperature rises Special footprints Retrofit accessory location Special paint color coordination 24-Hour Quotation Turnaround Niagara Transformer guarantees twenty-four hour turnaround on quotations including complete bill of material, technical data, and quotation sketches as required. If you need a faster response, then let us know. We will strive to meet your quotation requirements. Call toll-free Utility Substation Power Transformer

4 Unit Substation Transformer with Conservator Glass Furnace Transformer High-Current Process Rectifier Duty Transformer Superior Service & Value The hallmark of Niagara Transformer is our value-added approach to transformer design and manufacturing. Our goal is to provide custom-designed transformers that meet your specifications and requirements at standard transformer prices. Our products are noted for their long-term quality, and our service is responsive and customerfocused. If you have any questions about our products or company, please feel free to contact us to speak to a sales engineer. Quality Standards Niagara Transformer exceeds the stringent quality requirements of military, laboratory, OEM, utility, and industrial customers around the world. All Niagara Transformer products comply with the latest ANSI, IEEE, NEMA, IEC and CSA requirements. We can also offer special certifications from UL, CSA, and professional engineer seismic approval, as well as conform to international standards and verifying authorities such as Det Norske Veritas and the American Bureau of Shipping. On-Time Delivery We understand that our customers work on rigid schedules. When Niagara Transformer confirms a delivery, it is guaranteed to be on site when you need it. Unrivaled Experience has manufactured transformers for more than 60 years. Our engineering and manufacturing departments are comprised of professionals averaging more than 20 years of experience and include individuals recruited from organizations throughout the industry. Niagara s transformers are operating not only throughout the United States, but also in sixty-five other countries around the globe. Our company joined NEMA in 1942 and continues to be an international leader in standards development through IEEE, ANSI and IEC. Contact us for standard and custom features, accessories, ratings, or more information about our complete range of liquid-filled transformers.

5 General Specifications Coils All coils are designed based on the customer s specific application. The kva, voltage rating, and the application dictate the use of either circular or rectangular forms with windings as follows: Continuous Disk - for medium to high-voltage applications where impulse strength is important. Barrel - for medium-voltage and medium-current applications. Helical - for high-current applications offering high short-circuit strength and low winding eddy current losses. Sheet - for low-voltage, high-current applications and the elimination of axial forces on winding short circuits. Coils can be furnished with temperature rise ratings of 55 C above ambient. Enhanced rating of units is available for 65 C rise units. Cores Cores are made from high-grade, non-aging, grain-oriented, cold-rolled silicone steel. They are laminated for high-magnetic permeability and low hysteresis and eddy current losses. Niagara Transformer offers computer-generated cores designed for the customer s specific application. Wound cores for low-power and stacked cores for high-power applications are offered. Stacked cores can be rectangular or cruciform (stepped). Either can be butt-cut, mitered, or step-lap mitered. Specialized cores, such as 4-leg, 5-leg, and gapped also can be supplied. Insulating Fluids Niagara Transformer can supply every cooling fluid currently available. Mineral oil or Envirotemp typically are used outdoors. R-Temp, beta, alpha, ester, and silicone fluids are offered when higher fire point liquids are needed. Tank Design Niagara liquid-filled tanks are welded, oil-tight steel construction with structural bases designed to permit skidding or rolling in either centerline direction. Sealed tanks are designed to withstand, without permanent deformation, pressure greater than 25% of the maximum operating pressure. Large tank designs are suitable for full vacuum processing. Niagara Transformer can accommodate any required orientation of terminals - from simple cable terminals to inline substation configuration, to custom terminal locations. Types of oil preservation systems include: Sealed Tank Construction - where the transformer is sealed airtight and a gas space of nitrogen above the oil serves as a pressure buffer. Inert Gas System - where the breathing of inert gas is controlled to maintain a positive pressure of nitrogen within the transformer tank. Conservator Style Design - where a vented reservoir tank allows for thermal expansion and contraction of the transformer liquid. Suitable for forced oil cooling designs. Finishes Niagara Transformer s standard paint finish is ANSI #61, Light Gray. We can furnish any ANSI paint color specified, or match a paint color if a paint chip is supplied. Special finishes can be supplied on request for: Chemical and/or corrosive environments High-humidity locations Offshore and coastal, salt-laden environments Niagara Transformer can provide terminal locations in any ANSI segment number requested, including any of the following individually or in any combination: Full height terminal chambers Partial height terminal chambers Wall-mounted throats Wall-mounted flanges Cover-mounted Cooling Cooling is performed by panel-type radiators that provide additional radiating surfaces for self-cooled transformers. Additional cooling can be added using singlestage, forced-air cooling to increase capacity within guaranteed temperature limits for: Continuous operation Periods of overloading Seasonal changes of loading This extra cooling is provided by motor-driven fans mounted on the transformer base.

6 Mission Statement The mission of Niagara Transformer Corporation is to be a respected supplier of custom-designed electrical equipment and to support these products with responsive technical and customer service. Our company is recognized for its engineering and manufacturing flexibility and experience, product quality, industry reputation, and long-term dependability. Our customers are around the world as well as around the corner. In addition to supplying transformers throughout the United States and its territories, we have recently provided transformers to more than 65 countries around the world. NIAGARA TRANSFORMER CORP. P.O. Box Dale Road Buffalo, New York Phone: Toll-Free: Fax: mail@niagaratransformer.com Website: