DELTA STAR, INC.
LYNCHBURG, VA

Delta-Star Electric was founded in Chicago in 1908 to manufacture devices required by the electrical industry in the generation, transmission, and distribution of electrical energy. Some of its early products included a complete line of high-voltage indoor and outdoor switches including disconnects, transfers, interrupters, and disrupters for single and group operation. In 1950, Delta-Star Electric Company was purchased by H. K. Porter Company and was subsequently renamed the Delta-Star Electric Division of H. K. Porter Company. On October 13, 1959, H. K. Porter purchased Hill Transformer and moved it to Belmont, California. Shortly after the purchase of Hill Transformer, H. K. Porter built a transformer plant in Lynchburg, Virginia and became operational in 1962. In 1980, the Chicago plant was closed. Subsequent to the closure of the Chicago plant, the Delta Star name (without the hyphen) was used by the transformer plants in Belmont and Lynchburg. On November 23, 1988, Delta Star was sold to the Delta Star Employee Stock Ownership Plan. On August 1, 2015, Delta Star acquired a transformer factory located in Saint-Jean-sur-Richelieu near Montreal, Quebec. The plant, formerly owned by Alstom, provided Delta Star's customers with a third location to build power transformers. This transaction increased not only Delta Star's market presence, but also its transformer capability.   Delta Star is capable of constructing transformers that are 315,000 volts and below in both single and three phase ratings through 900 BIL rating. These units could include tap-changing equipment and are utilized in both utility and industrial applications. Utility applications include power, distribution, generator step up, UAT, grounding units, voltage regulators, and autotransformers. Delta Star's industrial transformers are used for secondary load centers, unit substations, distribution services, power substations, and hazardous locations. Delta Star constructs mobile transformers that can be used for a number of different purposes, which include serving as temporary substations during emergencies or as a safeguard against power outages resulting from malfunctioning transformers. Additionally, mobile transformers are used in remote locations until permanent transformers are in place and for planning routine maintenance of permanent substations. Delta Star's mobile transformers can be built up to a capacity of 100 MVA rating and up to 230,000 volts. Delta Star can provide multiple voltage requirements for use on both the high and low sides. Additionally, load tap changer equipment can be installed for the secondary voltage regulation. All of the mobile transformers and mobile substations are welded to their trailers. Delta Star takes quality down to the component level. As a result, we design and manufacture our critical components in-house in order to meet our customer’s specific requirements. This is just another reason why utilities all over the world trust Delta Star for all their power needs. Every steel tank is designed and manufactured at our factories, giving us both flexibility and control over quality and lead time. Because long-term tank integrity is absolutely essential for the reliability and long life of a transformer, Delta Star fabricates transformer tanks to meet the highest standards of quality and craftsmanship. All tanks and covers are fabricated of high quality plate steel to withstand full vacuum. Tank corners are bent instead of welded to assure strength, reliability, and eliminate stress leaks. Welding is accomplished in a double shielded "mig" process that provides continuous welds. All tank seams are welded inside and outside to ensure leak free construction. Delta Star’s commitment to building our own switches gives us the ability to make the complex multiple voltage designs that are unique to our product. Tap changing equipment used on Delta Star transformers are available for off-load or load applications. Both type units have been developed and improved to exceed the highest industry standards to provide long service life with minimum maintenance requirements. Off-load DETC units feature silver plated contacts and operate under spring-pressure to ensure positive contact. The tap changing control lever is operated externally. It clearly indicates the tap position and can be pad locked in the locked position. Load LTC units maintain the voltage at the load to the required level, automatically utilizing advanced technical design and the most durable high efficiency, long contact life, and maintenance-free operation (vacuum-reactor or resistor types are available). We consider this a vital component of a load tap changing power transformer. While others purchase these components from third party providers, we design and build ours in-house. Delta Star’s decades of building mobile substations has led to a reliable nitrogen system that is considered the best in the industry. Today we utilize that time-tested design on our regular power transformers just because they are superior to any other system on the market. In this area, the flexibility of Delta Star is most visible. Delta Star builds lightweight, durable aluminum enclosures and control cabinets. Our unmatched engineering staff designs transformer protection and relaying systems on some of the most complex transformers and mobile substations on the market. As a result, Delta Star has more experience in control cabinets than anyone in the industry. Over the years Delta Star has relied on an epoxy-based primer with a polyurethane topcoat that we apply to every transformer. Our system underwent very extensive and rigid testing to comply with ANSI 57.12-28 and passed all tests including 1500 hours of salt fog test. This distinctive system, applied over a fully shot-blasted tank, gives us the best paint system in the world. The Delta Star product list goes far beyond power transformers. We have a strong reputation for providing the flexibility to build Auto and Ground Transformers, Voltage Regulators, Mobile Circuit Protectors, and Mobile and Portable Substations. As a result, Delta Star is the only North American transformer manufacturer with the breadth of products to meet all your power needs.