SUPERBUTE™

HY-BUTE 60™ butyl rubber as the external insulation

The outer shell of SUPERBUTE transformers are made with GE Vernova’s proprietary formula of butyl rubber, which is called HY-BUTE 60. This material adds the following timeless advantages over epoxy resins or porcelains designs:

• Encapsulating the unit with a tough, elastic rubber provides an inherent safety advantage as it dampens the severity of any potential failure
• Unique chemistry provides for non-arc tracking surface, significantly reducing risk of failure from flashover
• Legendary durability as this material does not easily chip, crack, or shear
• Will not stress crack due to the external environment, even in extreme conditions such as -50°C
• Maintains hydrophobicity over the life of the transformer
• Does not support combustion
• Does not oxidize or corrode

Epoxy takes the place of oil as the internal insulation and winding impregnation. The advantage of this design includes:

• Reduced footprint with a compact design with up to 30% less height than the leading oil-filled designs
• High tensile strength which allows for mounting in any position including vertical, horizontal, upside down, or at any angle
• Environmentally friendly design eliminates hidden costs associated with traditional liquid-filled designs such as:
• oil-leakage problems
• oil filtering or testing
• construction requirements for a large installation space or dedicated support structure

Lattice-type windings for voltage transformer

Originally patented by GE Vernova, lattice-type windings have precise controlled positioning and distribution of each turn to reduce maximum voltage stress within the winding. This unique design also minimizes the possibility of partial discharges within the winding. The coil configuration, and the outer electrostatic shields distribute steep voltage fronts across the coil to reduce concentration of stress.

Built-in surge protection for current transformers

A unique multi-gap type primary by-pass on current transformers 600 amps and below protects windings during line disturbances or steep current wave fronts. The gaps are factory adjusted to fire at 5000-7500 crest volts, thereby by-passing surge currents up to 100 times rated, which could otherwise result in excessive voltages across the primary winding.

High accuracy, extended range ratings for current transformers

The use of high accuracy instrument transformers with solid-state metering allows for improved billing accuracy and/or the potential to reduce inventory requirements. GE Vernova offers high accuracy and extended range ratings which meet the accuracy needed for these applications. Since introducing the first dry-type high-accuracy transformer solution in 1991, GE Vernova’s high accuracy product line has grown to a portfolio that includes a wide variety of voltage classes up to and including 69 kV.

Compact size & mounting flexibility

SUPERBUTE transformers require up to 30% less height and up to 40% less floor space compared to the leading oil-filled designs, and can be mounted in any position. This allows substation design flexibility including mounting on a substation steel structure or a pole.

Extra creep & strike

Even with 30% less height, standard units can be used in environmentally severe conditions and in high altitude (10,000ft) applications. Station class units have creep distances that exceed the requirements for even the next-level voltage class.