Three-Phase Pole/overhead Transformer

Document:

Three-Phase Pole/Overhead Transformer Brochure

Standards Single-Phase and Three-Phase Overhead Transformer Features

Bizoe Power manufactures a complete line of single-phase and three-phase overhead distribution transformers, including conventional, self-protected and step up/step-down

designs. Bizoe transformers have always been designed with increased margins of safety and reliability, and include the following standard features.

Standards Features

• Meets or exceeds current IEEE, NEMA and RUS standards as applicable

• Shell-type core design for both silicon and amorphous units

• Vertical triplex design for three-phase transformers

• Wet-process porcelain high-voltage bushings (oil-filled at 125 kV BIL and above for reduced radio interference)

• Molded polymer or wet process porcelain low voltage bushings

• Tin-plated bronze terminals suitable for connection to copper or aluminum

• Low-voltage grounding provision (except step-up/step-down units)

• Lightning arrester mounting provisions

• Low-voltage ground strap (1-bushing units only; not available on step-up/ step-down units)

• Permanently stamped identification on internal secondary leads for ease of paralleling Visible cover ground connected to upper mounting bracket or coupling on tank wall

• Tank grounding provisions

• Tank ground connector (1-bushing units only)

• Automatic pressure relief valve for added safety

• Mineral oil with oxidation inhibitor

• Mild steel tank, cover and ring

• Continuous-bead welding on lifting lugs and mounting brackets for increased safety and corrosion resistance

• Recessed tank bottom for scuff protection

• Tough powder-paint finish for improved resistance to abrasion and corrosion

• 10 kV minimum cover insulation

• Corrosion-resistant cover-ring hardware

• KVA marking on tank

• Internal oil-level mark

• Laser-engraved nameplate

In addition to the standard features and accessories previously listed, self-protected transformers also include the following:

• Low-voltage circuit breaker with external operating handle

• External, tank-mounted lightning arrester

• Internal, high-voltage expulsion fuse

Optional Features, Accessories and Design Standards

• Stainless steel tank and/or cover and/or cover ring

• Lightning arrester, externally-mounted or internally-mounted under oil (externally-mounted lightning arrester standard on self protected transformers)

• High-voltage tap switch with external operating handle:

4-2.5% taps above normal; or 4- 2.5%taps below normal; or 2- 2.5% taps above and below normal; or taps at 13800/13200/12870/ 12540 for units rated 14400

• Dual high-voltage switch with external operating handle

• Dual low-voltage switch (available only on step-up/step-down transformers)

• Interlaced low-voltage windings (not available on step-up/step-down or three-phase transformers)

• Drain valve with oil sampling device

• Temperature gauge

• Liquid level gauge

• Pressure/vacuum gauge

• Wildlife protection

• Overload warning signal light

• Emergency overload reset handle (available only on self-protected transformers)

• Tank ground connector (standard on 1 bushing transformers)

• Low-voltage winding ground strap (standard on 1 bushing transformers except step-up/step-down units)

• Natural Ester dielectric fluid

• Custom stenciling and labeling

• Laser engraved stainless steel nameplate

• Rural Utilities Service (RUS) design standards

• Canadian Standards Association (CSA) design standards

• NEMA TP-1 compliant designs

(Note: Contact your distributor or factory representative for availability of other kVA sizes, voltage ratings, features, accessories, and design standards not listed.)

 

 

Standard kVA and Voltage Ratings

Single-Phase Conventional

kVA Ratings (65°C Rise)

0.5, 1, 1.5, 3, 5, 10, 15, 25, 37.5, 50, 75, 100, 167, 250, 333, 500, 833

High-Voltage Ratings

2400/4160Y or 4160GrdY/2400 through 19920/34500GrdY or 34500GrdY/19920(60 kV through 250 kV BIL)

Low-Voltage Ratings

120,120/240, 240/480 or 277 (30 kV BIL)

 

Three-Phase Conventional or Self-Protected

kVA Ratings (65°C Rise)

30, 45, 75, 112.5, 150, 225, 300

High-Voltage Ratings

4160GrdY/2400 through 34500GrdY/19920(60 kV through 150 kV BIL)

Low-Voltage Ratings

208Y/120,480Y/277,240,480

240 with 120 mid-tap 480 with 240 mid-tap (30 kV BIL)

Note: Contact your distributor or factory representative for availability of other kVA sizes, voltage ratings, features, accessories, and design standards not listed

 

 

Bizoe 3-phase overhead brochure.pdf