Attch_7_VAFB_PADMOUNT_TRANSFORMER_SPECIFICATIONS_Revised.pdf

FA461019RA027

Attachment 7

PADMOUNT TRANSFORMER SPECIFICATIONS

(Typical)

In Accordance With UFGS 33 70 02-00.10 and UFC 3-550-01

• All stainless steel (Alloy 316) construction (includes tank, cabinet, base, radiators, fasteners, hinges, etc.)

• “Pentahead” Cabinet Locking Mechanism/Device

• Dead Front Construction (HV - 200A load break elbows with shield adapters)

• Externally clamped LV bushings with threaded copper stud for full load current below 2,100 amperes - NEMA spades shall be provided per ANSI hole requirements

• Radial Feed

• KVA: As Required

• Primary Voltage: 12kV Delta

• Secondary Voltage: As Required

• 3- Phase Transformer

• Frequency: 60Hz

• Windings: Copper

• Mineral Oil-Filled (Non-PCB): Type FR-3 Fluid

• Standard Impedance

• Mild steel high-voltage/low-voltage compartment barriers

• Metal Oxide Varistor (MOV) surge arresters

• Cooling Fins

• Proper grounding provisions

• Dial type gauges for oil temperature, liquid level, and pressure/vacuum

• Bay-O-Net Fuses & Current-Limiting Fuses: Properly-sized - Additionally, the transformer will include 3 spare fuses

• Two-Position “ON/OFF” Load Break Primary Switch

• 5-Position Tap Changer: (-5%, -2½%. 0, +2½%, +5%)

• Automatic pressure relief device mounted in the terminal compartment

• Oil drain valve with sampling device, and an oil fill/oil level plug

• Nameplate and NEMA Safety Labels: Include a “UL Listed” symbol on ratings label and nameplate

• Compliant with 2016 DOE Efficiency Standard

• Four (4) lifting lugs

• Entire exterior of the pad-mount transformer and terminal compartments shall be painted with a munsell green, outdoor finish

• Guaranteed to have an average coil winding temperature of 65°C rise over an average ambient air temperature of 30°C when operated at rated voltage and load conditions

FA461019RA001

Attachment 7

Series of transformer tests (includes DGA) used to verify conformance to performance requirements as outlined in the latest revisions of ANSI C57.12.00 and ANSI C57.12.90. A report outlining successful test results must be completed and submitted to the Contracting Officer prior to final equipment acceptance