General Construction Specifications
PART 1 - GENERAL
01 SECTION INCLUDES
A. Liquid filled pad mounted distribution transformer.
02 RELATED SECTIONS
A. Section 03300 - Cast-In-Place Concrete: Pads for transformer support.
03 REFERENCES
A. ANSI C37.47 - Specifications for Distribution Fuse Disconnecting Switches, Fuse Supports, and Current-Limiting Fuses.
B. ANSI C57.12.22 - Requirements for Pad-Mounted, Compartmental- Type, Self-Cooled, Three-Phase Distribution Transformers with High-Voltage Bushings; High Voltage, 34500 GrdY/19920 Volts and Below; 4000 kVA and Smaller.
C. ANSI/IEEE C57.12.90 - Test Code for Liquid-Immersed Distribution Power, and Regulating Transformers.
D. ANSI/IEEE C57.13 - Requirements for Instrument Transformers.
E. ANSI/IEEE 386 - Separable Insulated Connector Systems for Power Distribution Systems Above 600 V.
F. ASTM D877 - Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes.
G. NEMA 260 - Safety Labels for Padmounted Switchgear and Transformers Sited in Public Areas.
04 SUBMITTALS
A. Submit product data under the provisions of applicable Sections of Division 1
B. Submit product data indicating standard model design tests and options.
05 OPERATION AND MAINTENANCE DATA
A. Submit operation and maintenance data under provisions of applicable Sections of Division 1.
B. Include procedures for sampling and maintaining fluid, cleaning unit, and replacing components.
06 QUALITY ASSURANCE
A. Manufacturer: Company specializing in distribution transformers with five years documented experience.
07 DELIVERY, STORAGE, AND HANDLING
A. Deliver products to site, store and protect under provisions of applicable Sections of Division 1.
PART 2 - PRODUCTS
08 MANUFACTURERS - PAD MOUNTED TRANSFORMERS
A. General Electric.
B. RTE.
C. Westinghouse.
D. Square-D.
2.02 PAD MOUNTED TRANSFORMERS
A. Liquid-filled Transformers: ANSI C57.12.22; three phase, pad mounted, self-cooled transformer unit.
B. Capacity: As shown on Drawings.
C. Primary Voltage: 13.8 kV, delta connected; provide standard primary taps, with externally-operated tap changer.
D. Secondary Voltage: 2300/4160 volts, dual voltage, delta connected and 277/480 volts wye connected.
E. Impedance: 5.75 percent.
F. Basic Impulse Level: 95 kV.
G. Cooling and Temperature Rise; ANSI C57.12.22; Class OA. 55 degrees C, self-cooled.
H. Liquid: Oil.
I. Accessories: ANSI C57.12.22 standard accessories.
J. Cooling and Temperature Rise: ANSI/IEEE C57.12.01; Class AA. 220 degree C insulation class with 55 degree C rise over 40 degree C ambient.
K. Primary Terminations: Porcelain insulator bushings for connection to load interrupter switch.
L. Primary Switching: Fused air switch, gang operated.
M. Secondary Terminations: Provide secondary air terminal chamber.
PART 3 - EXECUTION
09 EXAMINATION
A. Verify that pads are ready to receive work.
B. Verify field measurements are as shown on shop drawings.
C. Verify that required utilities are available, in proper location and ready for use.
D. Beginning of installation means installer accepts conditions.
010 INSTALLATION
A. Install in accordance with manufacturer's instructions.
B. Install safety labels to NEMA 260.
011 FIELD QUALITY CONTROL
A. Field testing will be performed under provisions of applicable Sections of Division 1.
B. Test dielectric liquid to ASTM D877, using 25,000 volts minimum breakdown voltage, after installation and before energizing from system.
C. Test transformer to ANSI/IEEE C57.12.90.
012 ADJUSTING
A. Adjust work under provisions of applicable Sections of Division 1.
B. Adjust primary taps so that secondary voltage is within 2 percent of rated voltage when under load.
END OF SECTION
