Years of dedicated testing and research and development of Nomex® paper and pressboard products have yielded the potential for a variety of economic, environmental and safety benefits, when used in fluid-filled transformers.
Mobile transformers
Traction transformers
Transformers for wind power
Repaired substations
Utility substations
Unit substations
Rectifier transformers
Furnace transformers
Pole-top distribution transformers
Pad mounted distribution transformers
Nomex® insulation technologies in fluid-filled transformers can:
While maintaining top oil temperatures at constant levels with only modest increases in average oil temperatures, the weight of a transformer can be reduced up to 25 percent for a given kVA output. Conversely, the kVA rating can be increased up to 50 percent for a given size and weight.
This weight reduction allows mobile substations and railway traction transformers, for example, to be designed with operating capabilities larger than before. More compactly designed transformers are revolutionizing the wind-generator marketplace in a similar manner. Use of high temperature fluids like silicone oil or ester fluids permit even greater savings in size and weight.
Transformers insulated with Nomex® can be designed for extra power capacity in emergency peak load situations.
Insulation systems based on Nomex® technologies maintain excellent electrical and mechanical characteristics over a transformer's service life. Negligible aging, resistance to shrinkage and compression, and the superior resilience of Nomex® help coil structures remain tight and withstand short-circuit forces, even after years of service.
Customers for transformers insulated with Nomex® have included users in the power utility, industrial and railway markets. IEEE Guide 1276 and IEC Technical Specification 60076-14 provide guidance to manufacturers and users regarding the production and application of some of these tranformers.
