Pad-Mounted Transformers

TEK Transformatör offers extensive design flexibility, including loop or radial feed, single or three-phase configurations, and a variety of bushing types, protection devices, and cabinet arrangements, allowing adaptation to site-specific electrical and environmental requirements. Environmentally responsible production techniques, low-loss core materials, and bio-based or mineral insulating fluids contribute to sustainability and reduced total cost of ownership. These transformers are designed to operate reliably under C3 to C5 environmental categories, with surface treatment systems applied in accordance with ISO 12944. 

Technical Design Specifications

• Table 1. Product General Details

Power	45–25,000 kVA
Primary voltage	2400–36,000 V
secondary voltage	208Y/120 V to 14,400 V
General	Three-phase 50 or 60 Hz 65ºC Rise (55ºC, 55/65ºC)
Oil type	Mineral Oil or Natural Oil
Impedance voltage	According to ANSI/IEEE C.57

 

• Table 2. Three-phase ratings

Available Powers (can be customized to meet specific needs)

45, 75, 112.5, 150, 225, 300, 500,750,1000, 1500, 2000, 2500, 3000, 3750, 5000, 7500, 10000, 15000, 20000, 25000

 

• Table 3. Audible sound levels 

KVA rating	Decibels (dB)
45-300	55
301-500	56
501-700	57
701-1000	58
1001-1500	59
1501-2000	61
2001-2500	62
2501-4000	64
4001-6000	65
6001-10000	68
For 10001 and above	According to customer needs

 

• Table 4. Insulation test levels

Class (kV)	BIL (kV)
1,2	30
2,5	45
5	60
8,7	75
15	95
25	125
36	150

 

• Temperature rise ratings 0–3300 ft (0–1000 m)

	Standard	Optional
Winding Temperature rise	65°C	55°C - 75°C
Ambient Temperature Max.	40°C	50°C
Hot spot	80°C	65°C

 

Default Features

• Tap changers
• Bolted cover for tank access (45–2500 kVA) 
• Welded cover with hand hole (>2500 kVA) 
• Three-point latching door for security 
• Lifting lugs 
• Stainless steel cabinet hinges and mounting studs
• Steel divider between high- and low-voltage compartment 
• 20-inch-deep cabinet (45–1000 kVA) 
• 24-inch-deep cabinet (1500–7500 kVA) 
• 30-inch-deep cabinet (34.5/19.92 kV) 
• Stainless steel one-hole ground pads (45–500 kVA) 
• Stainless steel two-hole ground pads (750–25,000 kVA) 
• Parking stands (dead-front)
• Drain valve with sampler
• Pressure relief valve
• Oil level gauge
• Cooling finwalls or radiator
• Stainless steel Laser-scribed anodized aluminum nameplate

Optional features

• Input/Output Type & Configuration

** Plug-In Bushing

** Porcelain Bushing

** Composite Bushing

** Wall/Barrier Bushing

Available as Dead Front or Live Front

Loop Feed or Radial Feed configurations 

different current and voltage capacities

Overcurrent/Overvoltage Protection

** Bay-O-Net fusing (current sensing, dual sensing, dual element, high amperage overload) 

** Bay-O-Net expulsion fuse in series with a partial range under-oil ELSP current-limiting fuse (below 23 kV) 

** Cartridge fusing in series with a partial range under-oil ELSP current-limiting fuse (above 23 kV) 

** MagneX™ interrupter (Eaton Brand) with ELSP current-limiting fuse 

Vacuum fault interrupter (VFI)-12.5 kA / 16 kA

** Visible break window 

** Fuse/switch interlock

** Distribution, intermediate, or station-class surge arresters 

** Elbow arresters (for dead-front connections)

Switches 

** One, two, or three On/Off loadbreak switches 

** Four-position loadbreak V-blade switch or T-blade switch 

** Delta-wye switch 

** Three-position V-Blade selector switch

** Dual-voltage switch

Gauges & other protection devices

** Oil-level gauge (optional contacts) 

** Pressure vacuum gauge (optional contacts and bleeder) 

** Dial-type thermometer (optional alarm contacts) 

** Cover-mounted pressure relief device (optional alarm contacts) 

** Ground connectors 

Decals & lables

** All labels requests from customers

Painting and coating

All external surfaces undergo grit blasting, phosphating, and multi-layer coating, providing strong adhesion and corrosion resistance. Final paint systems are applied in accordance with ANSI, offering color options such as:

• ANSI Bell Green
• ANSI #61 Light Gray
• ANSI #70 Sky Gray
• Custom RAL or Munsell colors available upon request