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UFGS-26 12 19.00 40

2014 Edition, August 2017

Complete Document

PAD-MOUNTED, LIQUID-FILLED, MEDIUM-VOLTAGE TRANSFORMERS

Includes all amendments and changes through Change 1, August 2017


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Description / Abstract:

NOTE:

This guide specification covers the requirements for three-phase pad-mounted transformers of the dead-front and live-front types for exterior applications. Use pad-mounted transformers (properly protected with bayonet type, oil-immersed, expulsion fuses in series with oil-immersed, partial-range, current-limiting fuses) for kVA ratings up to and including 750 kVA on 5 kV systems and for kVA ratings up to and including 1500 kVA on 15 and 25 kV systems.

For voltages above 25 kV and in ratings above those previously indicated, this specification requires significant modifications and additional specification sections may need to be added on the project.

The use of pad-mounted transformers with secondary currents exceeding 2000 amperes is discouraged due to the size and quantity of secondary conductors. Therefore, transformers above 750 kVA serving 208Y/120 volt loads and transformers above 1500 kVA serving 480Y/277 volt loads should be in a secondary unit substation configuration.

Contact the cognizant EFD or PWC for direction.

For SOUTHNAVFACENGCOM projects, determine the use of secondary unit substations on a case by case basis.

Use the following related guide specifications for power distribution equipment:

Section 26 08 00 APPARATUS INSPECTION AND TESTING

Section 26 12 21 SINGLE-PHASE PAD-MOUNTED TRANSFORMERS

Section 33 71 01 OVERHEAD TRANSMISSION AND DISTRIBUTION

Section 26 11 14.00 10 MAIN ELECTRIC SUPPLY STATION AND SUBSTATION

Section 26 11 13.00 20 PRIMARY UNIT SUBSTATION

Section 26 11 16 SECONDARY UNIT SUBSTATIONS

Section 26 28 00.00 10 MOTOR CONTROL CENTERS, SWITCHBOARDS AND PANELBOARDS

Section 26 22 00.00 10 480-VOLT STATION SERVICE SWITCHGEAR AND TRANSFORMERS

Section 26 23 00 SWITCHBOARDS AND SWITCHGEAR