Three Phase Overhead Pole Mounted Distribution Transformer

Silverstone Electric manufactures a complete line of three-phase overhead distribution transformers, designed for safety and reliability.

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

Ratings
• KVA Ratings (65° 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, and 480 with 240 mid-tap
(30 kV BIL)

Standard Features
• Meets or exceeds current ANSI, IEEE, NEMA, RUS, and DOE standards as applicable
• Vertical triplex design
• 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
• Low-voltage ground strap
• Permanently stamped identification on internal secondary leads
• Visible cover ground connected to upper mounting bracket
• Tank grounding provisions
• Tank ground connector
• Automatic pressure relief valve for added safety
• Mineral oil with oxidation inhibitor
• Mild steel tank, cover and ring
• Corrosion-resistant cover-ring hardware
• 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 and ring insulation
• KVA marking on tank
• Internal oil-level mark
• Laser-engraved aluminum nameplate

Optional Features
• Stainless steel tank and/or cover and/or cover ring
• Lightning arrester mounting provisions
• Lightning arresters, externally-mounted
• High-voltage tap switch with external operating handle:
5-2.5% taps above normal; Or 5-2.5% 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
• Drain valve with oil sampling device
• Temperature gauge
• Liquid level gauge
• Pressure/vacuum gauge
• Wildlife protection
• Ester-based dielectric fluid
• Custom stenciling and labeling
• Laser engraved stainless steel nameplate

Factory Inspection