power distribution - Siemens

TransformersDry Type Distribution 600 Volt ClassSiemens dry type distribution transformersare rated 600 volt class and are availablein a wide variety of ratings to provideversatile electrical distribution for generalpurpose, lighting and power loads incommercial and industrial applications.Ratings are available from 0.25 through167 kVA single phase, and 3 through 1000kVA 3-phase. A variety of primary andsecondary voltage ratings are available tomatch the load requirements to thedistribution system. All units meetapplicable ANSI and NEMA standards.Standard designs are UL Listed.Dry type transformers are air cooled bynatural convection. They require nospecial vaults for installation, and canbe installed in locations convenient tothe load being served.Encapsulated designs are provided forratings from 0.25 kVA through 15 kVA,1-phase, and from 3 kVA through 15kVA 3-phase. These designs featureindoor/outdoor enclosures with integralwall mounting brackets, and 115°C rise,180°C insulation system.Encapsulated TransformerVentilated designs are provided for ratingsfrom 25 kVA through 167 kVA 1- phase,and from 15 kVA through 1000 kVA 3-phase. These feature indoor enclosures,150°C rise, and 220°C insulation system.Ventilated TransformerGeneralA wide variety of designs and optionalaccessories are available includingweather shields for outdoor NEMA 3Rprotection.K-Factor Rated for Non-Linear LoadsSiemens offers transformer designswhich meet K-Factor ratings. K-Factor isa ratio between the additional lossesdue to harmonics and the eddy losses at60Hz. It is used to specify transformersfor non-linear loads. Note that K-Factortransformers do not eliminate harmonicdistortion; they withstand the non-linearload condition without overheating.K-Factor Features Designed to ANSI and NEMAStandards UL K-Factor Listed per UL 1561 K-Factor Rating Designed to IEEEc57.110 Aluminum Wound Coils Core, Conductors designed forHarmonics and Eddy Currents 150°CRise, 220°C Insulation Electrostatic Shield to Attenuate LineTransients 200% Neutral Bar (2X Phase current) NEMA 1 EnclosureOptions Special K-Factor ratings Special voltage ratings NEMA 3R Enclosure 80° or 115°C temperature rise Low noise designs Copper windings Drip shields Wall mounting brackets (15–50 kVA)Encapsulated Features UL Listed Designs Totally Enclosed, Non-Ventilated Heavy Gauge Steel Enclosure Core and Coil Completely EmbeddedWithin a Resin Compound — quiet,low temperature operation Encapsulation — seals out moistureand air UL Listed Indoor/Outdoor Enclosure— features integral wall mountingbrackets Rugged Design Resists Weather,Dust, and Corrosion Efficient, Compact, Lightweight —easy to install Flexible Wiring Leads TerminateWithin Bottom Wiring Compartment Large Wiring Compartment onBottom with Convenient Knockouts High Quality Non-Aging ElectricalGrade Core Steel Precision Wound CoilsOptions Copper windings Electrostatic shield (3 kVA and larger)Ventilated Features UL Listed Designs Designed for Indoor Installation Core and Coils are Designed with ULListed High-Temperature Materials —rated for 220°C; standard units feature150°C winding temperature rise Rugged Sheet Steel Enclosure perULI561, UL506 standards withRemovable Panels for Access toInternal Wiring Area Neoprene Noise Dampening PadsIsolate the Core and Coil from theEnclosure High Quality, Non-Aging ElectricalGrade Core Steel Precision Wound CoilsOptions Low temperature rise of 115°C or80°C winding temperature rise forincreased efficiency and additionaloverload capability Outdoor enclosures Totally enclosed non-ventilateddesigns Copper windings Electrostatic shield Low noise designs K-factor rated designs Drip shields and wall brackets available7 TRANSFORMERSSiemens Power Distribution & Control, SPEEDFAX 2007-2008 Product Catalog 7-3