Distribution transformer

immersedfor outdoor servicefor electrical networks

Product Description
Padmount transformers are outdoor pad-mounted distribution transformers for commercial, industrial and utility networks. They are installed on a pad with underground cable entry and feature a tamper-proof enclosure suitable for public areas. Available in live-front or dead-front HV configurations and in radial or loop feed arrangements. Environmentally friendly insulating fluids are available. Units can be supplied from stock or manufactured to customer specifications and are built to applicable ANSI/IEEE and NEMA standards. When applicable, units are designed to meet Department of Energy (DOE) efficiency requirements.

Product Scope

• Available sizes: 75 kVA to 7,500 kVA
• High voltage: up to 34.5 kV (delta or wye)
• Low voltage: up to 15 kV (delta or wye)
• Frequency: 60 Hz (50 Hz available as option)
• Temperature rise: standard 65°C ONAN
• Windings: aluminum or copper

Standard Accessories

• Liquid level gauge
• Dial-type liquid thermometer
• Pressure-vacuum gauge
• Pressure relief valve
• De-energized tapchanger
• 1 in upper filter press connection
• Drain valve with sampler
• Dead-front or live-front high-voltage bushings
• Spade-type low-voltage bushings
• Lifting and jacking provisions
• Tank base designed for skidding or rolling

Standard Tests

• Ratio
• Resistance
• Polarity
• Phase relationship
• No-load loss (core loss)
• Load loss (winding loss)
• Excitation current
• Impedance
• Applied potential
• Induced potential
• ANSI series impulse
• Temperature rise
• Pressure leak test

Optional Accessories

• 55°C or 55/65°C temperature rise options
• High fire-point insulating fluids
• 50 Hz frequency
• Pressure relief device
• Bay-O-Net fuses
• Current-limiting fuses (full or partial range)
• Sectionalizing loadbreak switches
• 2-position loadbreak switch (on/off)
• Lightning arresters
• Gauges with alarm contacts
• Upper fill valve

Technical specifications

• Type: Padmount transformer, tamper-proof pad-mounted design
• Capacity range: 75 kVA to 7,500 kVA
• High voltage: up to 34.5 kV (delta or wye), available live-front or dead-front
• Low voltage: up to 15 kV (delta or wye)
• Frequency: 60 Hz (50 Hz available as option)
• Temperature rise: standard 65°C ONAN; optional 55°C or 55/65°C
• Windings: aluminum or copper
• Cooling/Fluid: environmentally friendly fluids available; high fire-point fluids optional
• Feed configurations: radial feed or loop feed
• Standards: manufactured to meet applicable ANSI/IEEE and NEMA standards
• Efficiency: designed to meet DOE efficiency requirements when applicable
• Standard tests: ratio, resistance, polarity, phase relationship, no-load loss, load loss, excitation current, impedance, applied/induced potential, ANSI series impulse, temperature rise, pressure leak test
• Typical accessories: liquid level gauge, dial thermometer, pressure-vacuum gauge, pressure relief valve, de-energized tapchanger, drain valve with sampler, choice of HV/LV bushings, lifting/jacking provisions, skidding/rolling tank base