Dry Type Medium Voltage Distribution Transformers

Silverstone Electric transformers are suitable for operation in relatively clean environments and under "usual service conditions" as defined by IEEE Standard C57.12.01.
• Power: 225-2, 500 kVA three-phase, self-cooled AA-rated
• High-voltage rating: 2.4 kV-34.5 kV
• High-voltage BlL: Up to 150 kV (per IEEE standards)
• Low-voltage rating: 120 V? 600 V
• Low-voltage BlL: Up to 30 kV (per IEEE standards)
• Temperature rise at rated load: 150° C (at 30° C average/40° C maximum ambient)
• Frequency: 60 Hz. Standard Design Features and Accessories
• 220° C insulation system
• Step-lap mitered core
• Core ground strap (insulated core with single ground point)
• Painted core
• High-voltage taps (two 2-1/2% above and below nominal)
• NEMA 1 enclosure
• Lifting eyes
• Provisions for rolling
• Capability for adding cooling fans (units over 500 kVA)
• Electrostatically applied powder exterior finish with urethane top coat (ANSI 61 gray)
• Ground pad
• Diagrammatic nameplate (aluminum)
Standard Design Features and Accessories
• 220° C insulation system
• Step-lap mitered core
• Core ground strap (insulated core with single ground point)
• Painted core
• High-voltage taps (two 2-1/2% above and below nominal)
• NEMA 1 enclosure
• Lifting eyes
• Provisions for rolling
• Capability for adding cooling fans (units over 500 kVA)
• Electrostatically applied powder exterior finish with urethane top coat (ANSI 61 gray)
• Ground pad
• Diagrammatic nameplate (aluminum)
Optional Design Features and Accessories
Silverstone excels at producing custom designs for non-standard applications and can offer numerous optional features and accessories to suit a customer’s special requirements.
• Custom designs for special applications
• Loss optimisation for lower total owning cost
• Higher efficiency requirement
• 50 Hz. Frequency
• Non-standard ambient conditions
• Non-standard BIL level
• Non-standard altitude requirement
• Non-standard sound requirement
• Higher overload capacity
• Low X/R ratios
• K- factor rated (K-1, K-4, K-9)
• Special seismic qualification
• Reduced vibration and vibration isolation
• Retrofit designs
• 80° C or 115° C temperature rise
• Automatic fan cooling package (FA rated)
• Digital temperature monitor
• Copper bus and windings
• Wye-wye connected windings
• Special taps available
• Provisions for parallel operation
• Ground bus (copper)
• Medium-voltage interrupter switch
• Lightning arresters
• R/C snubbers
• Current transformers
• Potential transformers (contact factory)
• Power meter
• Control power transformer
• SCADA interface
• Space heaters with thermostat
• Flanged throats and air terminal chambers
• Dust filters (for non-UL listed transformers)
• Screens for insect and rodent proofing
• Wheels
• IR windows
• ANSI 49 or ANSI 70 external gray finish
• Stainless-steel enclosure
• Stainless-steel diagrammatic nameplate