Transformadores de media tension

Product Data Bulletin 0150PD9602 March 1997

Medium Voltage Transformers
Selection Guide

CONTENTS SQUARE D PRODUCT SCOPE .......................................................... TOPICS TO CONSIDER WHEN SELECTING A TRANSFORMER ..... Selection Criteria ............................................................................ Installation Site............................................................................... Transformer Use ............................................................................ Transformer Capabilities ................................................................ Costs .............................................................................................. RECOGNIZING KEY STATEMENTS IN SPECIFICATIONS ............... Liquid-FilledTransformers ............................................................. Dry Type Transformers .................................................................. SUMMARY ........................................................................................... 2 4 4 6 8 9 11 14 14 14 15

Medium Voltage Transformers Selection Guide Product Scope

Bulletin No. 0150PD9602 3/97

PRODUCT SCOPEPAD MOUNTED
Class 7230
PAD MOUNTED transformers are best suited for commercial applications in public access areas and where underground service is required. Predominately designed as liquid-filled, but may be available as dry type depending on voltage ratings. ANSI Standards require each pad mounted transformer to be tamperproof. High and low voltage terminations are housed in two side-by-sidecabinets. Design Life s 20 years*— compact, low-profile design and rectangular construction provide years of service. Environmental Information
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SUBSTATION
Class 7240
SUBSTATION liquid-filled transformers are ideal for use in light-to-medium industrial applications. Station-type transformers can be applied as a standalone application, but are usually part of a substation lineup wheretransformers can be used between the high voltage and low voltage equipment. Design Life
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NETWORK
Class 7270
NETWORK transformers are designed specifically for use in network configurations that supply critical power to utility grid systems. Design Life s 20 years*— electrically and mechanically designed to meet the special demands of a network grid. Considered to be the most reliable distributionsystem available.
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20 years*—standard rectangular construction optimizes the dielectric value of the insulating fluid.

Designed according to ANSI standards

Environmental Information
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Environmental Information
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Insulating fluid available from Square D in mineral oil, R-Temp® fluid, or silicone Sealed tank construction Suitable for some harsh environments Special waste disposalconsiderations for fluid-filled units

Insulating fluid available from Square D in mineral oil or silicone. Sealed tank construction Special waste disposal considerations for fluid-filled units

Insulating fluid available from Square D in mineral oil, R-Temp® fluid, or silicone Sealed tank construction on fluid-filled units Special waste disposal considerations for fluid-filled units

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Ratings and Configurations
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Ratings s 300– 2,500 kVA s 2.5 to 15 kV primary Cost of Ownership
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Ratings and Configurations s 75– 5,000 kVA s 2.5 to 34 kV primary s 55°C, 55/65°C or 65°C Insulation Class s Live or dead front s Loop or radial-feed system Cost of Ownership
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225–10,000 kVA 2.5 to 46 kV primary 55°C, 55/65°C or 65°C Insulation Class Livefront, radial-feed system Cover or sidewall-mounted bushings Significant installation costs Generally the most costly to install and maintain Cost associated with maintenance to ensure proper fluid levels on liquidfilled units Substantial decommissioning costs

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Cost of Ownership
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Low initial costs Cost associated with maintenance to ensure proper fluid levels Special protection...