PSG Section 16461 - Eaton



Eaton Guide SpecificationNotes and instructions to specwriterThe following guide specification is offered for your assistance in specifying this product as part of a CSI (Construction Specification Institute) compliant document.This guide specification has been created in MS Word and uses Word features including Styles and Review to assist in editing and formatting. You may also find it helpful to view the document in Outline mode when editing or selecting sections to copy/paste into your base document.Styles Styles are provided for all paragraph types described in the CSI Masterformat. Applying a Style to text will provide the correct indentation, paragraph letter/number, font, capitalization, etc…. Styles are shown on the right-hand side of the Word “Home” ribbon.Review“Notes to Specwriter” (when available) are provided using the Reviews feature in Word. To view “Notes to Specwriter” select “All Markup” in the Tracking dropdown menu on the Review ribbon. To hide notes, select “No Markup”. You can advance from one note to the next using the Previous and Next buttons on the same ribbon. In earlier versions of MSWord hide notes by un-checking ‘Comments’ under Review>SHOutline view The Outline view within Word is often helpful when editing or copying sections from this Guide Specification. Also, when pasting sections from this document into a base document the specwriter may want to consider using right-click and “Merge Formatting’ or ‘Keep Text Only” features.Section 26 22 13DRY-TYPE DISTRIBUTION TRANSFORMERS (1500 KVA and Below)generalScopeThe Contractor shall furnish and install single-phase and three-phase general purpose individually mounted dry-type transformers of the two-windings type, self-cooled as specified herein, and as shown on the contract drawings.Related SectionsReferencesThe transformers and all components shall be designed, manufactured and tested in accordance with the latest applicable standards of ANSI, NEMA and UL.Transformers shall meet the requirements of the most current version of federal law 10 CFR Part 431 "Energy Efficiency Program for Certain Commercial and Industrial Equipment".Transformers shall meet the requirements of the 2016 California Energy Code (CEnC), Part 6 – Subchapter 2, Section 110.1 under “Distribution Transformers” and be Certified by the Manufacturer as required by the Title 20 Appliance Efficiency Regulations, unless otherwise EXEMPT under 110.10(a).Submittals – for Review/approvalThe following information shall be submitted to the Engineer:Outline dimensions and weightsTransformer ratings including:kVAPrimary and secondary voltageTapsBasic impulse level (BIL) for equipment over 600 voltsDesign impedanceInsulation class and temperature riseSound level.Product data sheetsSubmittals – for constructionThe following information shall be submitted for record purposes.Final as-built drawings and information for items listed in Paragraph 1.04, and shall incorporate all changes made during the manufacturing processConnection diagramsInstallation informationSeismic certification and equipment anchorage details as specifiedQualificationsThe manufacturer of the dry-type distribution transformers shall be the same as the manufacturer of the other major electrical distribution equipment on the project.For the equipment specified herein, the manufacturer shall be ISO 9001 or 9002 certified.The manufacturer shall be a participant in the UL Data Acceptance Program (DAP) under the Client Test Data Program (CTDP) certification to ensure UL test methodologies and record traceability complies with the requirements of ISO 17025.Transformer must bear the UL Energy Efficiency Verification Mark to confirm that the unit meets the requirements of 10 CFR Part 431.The manufacturer of this equipment shall have produced similar electrical equipment for a minimum period of five (5) years. Provide Seismic tested equipment as follows:The equipment and major components shall be suitable for and certified by actual seismic testing to meet all applicable seismic requirements of the [latest International Building Code (IBC)] [latest California Building Code (CBC) with OSHPD Amendments]. [The equipment shall have OSHPD Special Seismic Certification (OSP) Pre-Approval.]The Project Structural Engineer will provide site specific ground motion criteria for use by the manufacturer to establish SDS values required.The IP rating of the equipment shall be 1.5The Structural Engineer for the Site will evaluate the SDS values published on the [Manufacturer’s] [OSHPD] website to ascertain that they are "equal to" or "greater than" those required for the Project Site.The following minimum mounting and installation guidelines shall be met, unless specifically modified by the above referenced standards.The Contractor shall provide equipment anchorage details, coordinated with the equipment mounting provision, prepared and stamped by a licensed civil engineer in the state. Mounting recommendations shall be provided by the manufacturer based upon the above criteria to verify the seismic design of the equipment.The equipment manufacturer shall certify that the equipment can withstand, that is, function following the seismic event, including both vertical and lateral required response spectra as specified in above codes.The equipment manufacturer shall document the requirements necessary for proper seismic mounting of the equipment. Seismic qualification shall be considered achieved when the capability of the equipment, meets or exceeds the specified response spectra.Regulatory RequirementsAll transformers shall be UL listed and bear the UL label.Delivery, Storage and HandlingEquipment shall be handled and stored in accordance with manufacturer’s instructions. One (1) copy of these instructions shall be included with the equipment at time of shipment.Operation and Maintenance ManualsEquipment operation and maintenance manuals shall be provided with each assembly shipped, and shall include instruction leaflets and instruction bulletins for the complete assembly and each major component.productsmanufacturersEaton____________________The listing of specific manufacturers above does not imply acceptance of their products that do not meet the specified ratings, features and functions. Manufacturers listed above are not relieved from meeting these specifications in their entirety. Products in compliance with the specification and manufactured by others not named will be considered only if pre-approved by the Engineer ten (10) days prior to bid date.ratingsThe kVA and voltage ratings shall be as indicated on the drawings.Transformers shall be designed for continuous operation at rated kVA, for 24 hours a day, 365 days a year operation, with normal life expectancy as defined in ANSI C57.96.Transformers shall meet the requirements of the most current version of federal law 10 CFR Part 431 "Energy Efficiency Program for Certain Commercial and Industrial Equipment".Transformers efficiency shall be measured according to federal law 10 CFR Part 431.Transformer sound levels shall not exceed the following ANSI and NEMA levels for self-cooled ratings:Self Cooled VentilatedSelf Cooled SealedEquivalent Winding kVA RangeK-Factor=1K-Factor=4K-Factor=9K-Factor=13K-Factor=203.00 and below3.01 to 9.009.01 to 15.0015.01 to 30.0030.01 to 50.0050.01 to 75.0075.01 to 112.50112.51 to 150.00150.01 to 225.00225.01 to 300.00300.01 to 500.00500.01 to 700.00700.01 to 1000.00Greater than 100040404545455050505555606264Consult Factory40404545485353535858636567Consult Factory45455050505555555757596163Consult FactoryWhere K-factor transformers are indicated on the drawings, the transformers shall be specifically designed to supply circuits with a harmonic profile equal to or less than a K-factor of [4] [9] [13] [20] without exceeding [80] [115] [130] [150] degrees C temperature rise.construction – general purpose transformersInsulation SystemsTransformer insulation system shall be as follows:Less than 15 kVA: 180 degrees C insulation system with [80] [115] degree C rise, encapsulated design; 15 kVA and above: minimum of 200 degree C insulation system with [80] [115] [130] [150] degree C rise, ventilated design.OR1 – 75 kVA, three-phase (37.5 kVA, single-phase): 180 degrees C insulation system with [80][115] degree C rise, encapsulated design; 5-45 kVA minimum of 200 degrees C insulation system with [80] [115] [130] [150] degree C rise; 50 kVA and above: minimum of 220 degrees C insulation system with [80] [130] [115] [150] degree C rise, ventilated design.Required performance shall be obtained without exceeding the above indicated temperature rise in a 40 degrees C maximum ambient, and a 24-hour average ambient of 30 degrees CAll insulation materials shall be flame-retardant and shall not support combustion as defined in ASTM Standard Test Method D635Core and Coil AssembliesTransformer core shall be constructed with high-grade, non-aging, silicon steel with high magnetic permeability, and low hysteresis and eddy current losses. Maximum magnetic flux densities shall be substantially below the saturation point. The transformer core volume shall allow efficient transformer operation at 10% above the nominal tap voltage. The core laminations shall be tightly clamped and compressed. Coils shall be wound of electrical grade [aluminum][copper] with continuous wound constructionOn three-phase units rated [75 kVA and below] [45 kVA and below] [30 kVA and below] [15 kVA and below] [9 kVA and below] and single-phase units rated [37.5 kVA and below] [25 kVA and below] [15 kVA and below] [10 kVA and below] the core and coil assembly shall be completely encapsulated in a proportioned mixture of epoxy or resin and aggregate to provide a moisture proof, shock-resistant seal. The core and coil encapsulation system shall minimize the sound levelOn three-phase units rated [15 kVA and above] [30 kVA and above] [45 kVA and above] [75 kVA and above] [112.5 kVA and above] and single-phase units rated [15 kVA and above] [25 kVA and above] [37.5 kVA and above] [50 kVA and above] the coils assembly shall be impregnated with non-hydroscopic, thermosetting varnish and cured to reduce hot spots and seal out moisture; the core shall be coated with HAPs (Hazardous Air Pollutants) free water reducible electrical varnish to give good corrosion resistance. The assembly shall be installed on vibration-absorbing padsTerminals shall be welded to the leads of the coils for better conductivity, less maintenance, and lower risk of hot spots. Terminals shall not be spot welded or bolted to the coil leads.TapsThree-phase transformers rated 15 through 225 kVA shall be provided with six 2-1/2% taps, two above and four below rated primary voltage. Three-phase transformers rated greater than 225 kVA shall be provided with manufacturer’s standard taps for that rating.All single-phase transformers, and three-phase transformers rated below 15 kVA and above 500 kVA, shall be provided with the manufacturer’s standard tap configuration.Electrostatic ShieldingWhere shown on the drawings, provide shielded isolation transformers with an electrostatic shield consisting of a single turn of aluminum placed between the primary and secondary winding and grounded to the housing of the transformer.Electrostatic shield shall provide primary to secondary winding capacitance between 24 and 18 picofarads over the range of 100 Hz to 20 kHz.Electrostatic shielding shall provide the following minimum attenuation when tested per MIL-Std-220A, Method of Insertion Loss Measurement, with matched impedance no load technique:Common mode noise attenuation: Minus 80 dBA minimum at 0.1 kHz to 1.5 kHz; minus 55 dBA minimum at 1.51 kHz to 100 kHz.Normal mode (Transverse mode) noise attenuation: Minus 35dBA minimum at 1.5 kHz to 10 kHz.Motor Drive IsolationWhere shown on the drawings, provide motor drive isolation transformersMotor drive isolation transformers shall be designed for use with three-phase ac adjustable frequency drives 600 volts and below to provide isolation between the incoming line and drive circuitry. These drives minimize the line disturbances caused by SCR firing within the drive unit. Thermoguards shall be included in all motor drive isolation transformers to provide additional protection for the transformer from increased heating due to the non-sinusoidal characteristics of drive currents. The transformer shall provide reduced short-circuit currents and voltage line transients. The transformer shall be specifically sized to the drive kVA requirements dictated by the horsepower of the motor and, as such, will be mechanically braced to withstand the stress of current reversals and short-circuit currents associated with the specific drive kVA rating. construction – k-factor transformersInsulation SystemsTransformers shall be insulated with a UL recognized minimum 200 degrees C insulation systemRequired performance shall be obtained without exceeding the above indicated temperature rise in a 40 degrees C maximum ambient and a 24-hour average ambient of 30 degrees CAll insulation materials shall be flame-retardant and shall not support combustion as defined in ASTM Standard Test Method D635Core and Coil AssembliesTransformer core shall be constructed with high-grade, non-aging, silicon steel with high magnetic permeability, and low hysteresis and eddy current losses. Maximum magnetic flux densities shall be substantially below the saturation point. The transformer core volume shall allow efficient transformer operation at 10% above the nominal tap voltage. The core laminations shall be tightly clamped and compressed. Coils shall be wound of electrical grade [aluminum][copper] with continuous wound construction. The core shall provide reduced induced currents in the steel caused by the high ratios of peak-to-rms currents and voltages found in harmonic loadsThe neutral bus shall be configured to accommodate 200% of the rated currentThe coils assembly shall be impregnated with non-hydroscopic, thermosetting varnish and cured to reduce hot spots and seal out moisture; the core shall be coated with HAPs (Hazardous Air Pollutants) free water reducible electrical varnish to give good corrosion resistance. The assembly shall be installed on vibration-absorbing padsTapsThree-phase K-factor rated transformers through 225 kVA shall be provided with six 2-1/2% taps, two above and four below rated primary voltage. Three-phase transformers rated greater than 225 kVA shall be provided with the manufacturer’s standard taps for that rating.Single-phase K-factor rated transformers shall be provided with manufacturer’s standard tap configurationElectrostatic ShieldingProvide K-rated transformers with electrostatic shielding consisting of a single turn of aluminum placed between the primary and secondary winding and grounded to the housing of the transformer.Electrostatic shield shall provide primary to secondary winding capacitance between 24 and 18 picofarads over the range of 100 Hz to 20 kHz.Electrostatic shielding shall provide the following minimum attenuation when tested per MIL-Std-220A, Method of Insertion Loss Measurement, with matched impedance no load technique:Common mode noise attenuation: Minus 80 dBA minimum at 0.1 kHz to 1.5 kHz; minus 55 dBA minimum at 1.51 kHz to 100 kHz.Normal mode (Transverse mode) noise attenuation: Minus 35dBA minimum at 1.5 kHz to 10 kHz.construction – harmonic mitigating transformersCore and Coil AssembliesTransformer core shall be constructed with high-grade, non-aging electrical steel with high magnetic permeability, and low hysteresis and eddy current losses. Maximum magnetic flux densities shall be substantially below the saturation point. The transformer core volume shall allow efficient transformer operation at 10% above the nominal tap voltage. The core laminations shall be tightly clamped and compressed.The coils assembly shall be impregnated with non-hydroscopic, thermosetting varnish and cured to reduce hot spots and seal out moisture; the core shall be coated with HAPs (Hazardous Air Pollutants) free water reducible electrical varnish to give good corrosion resistance. The internal core and coil assembly shall be installed on vibration-absorbing pads.Transformers shall be of two-winding construction. The primary winding shall be a delta, three-wire connection and the secondary winding shall be wye-zigzag with a wye field connection.Primary and secondary windings shall be wound of electrical grade [aluminum][copper] with continuous wound construction. All terminals and bussing shall be [aluminum][copper].Transformers shall be insulated with a UL recognized minimum 200 degrees C insulation system. Winding temperature rise shall not exceed [80] [115] [130] [150] degrees C.Required performance shall be obtained without exceeding the above indicated temperature rise in a 40 degrees C maximum ambient, and a 24 hour average ambient of 30 degrees C.All insulation materials shall be flame-retardant and shall not support combustion as defined in ASTM Standard Test Method D635.Neutral conductor shall be [aluminum][copper] and rated to carry 200% of normal phase current.Windings shall have a BIL of 10 KV.TapsThree-phase harmonic mitigating transformers rated 15 through 225 kVA shall be provided with six 2-1/2% taps, two above and four below rated primary voltage. Three-phase transformers rated greater than 225 kVA shall be provided with manufacturer’s standard taps for that rating.Electrostatic ShieldingHarmonic mitigating transformers shall be provided with an independent, [single][double], full-width electrostatic shield consisting of a single turn of [aluminum][copper] placed between each primary and secondary winding and grounded. Electrostatic shield shall provide primary to secondary winding capacitance between 24 and 18 picofarads over the range of 100 Hz to 20 kHz.Electrostatic shielding shall provide the following minimum attenuation when tested per MIL-Std-220A, Method of Insertion Loss Measurement, with matched impedance no load technique:Common mode noise attenuation: Minus 80 dBA minimum at 0.1 kHz to 1.5 kHz; minus 55 dBA minimum at 1.51 kHz to 100 kHz.Normal mode (Transverse mode) noise attenuation: Minus 35dBA minimum at 1.5 kHz to 10 kHz.Harmonic treatmentHarmonic Mitigating Transformers (HMTs) shall have a low Positive/Negative sequence impedance (between 4.6% and 7.2%) and low Zero-Sequence impedance/reactance (less than 0.55% and 0.47% respectively)Triplen harmonics shall be treated in the secondary windings through flux cancellation and not coupled in to the primary delta winding.5th and 7th harmonic currents shall be treated through the pairing of phase-shifted transformers such that these harmonic currents subtract at the common bus feeding the transformers with harmonics produced by other similar sources. Each of the transformers used to treat 5th and 7th harmonic currents shall also treat triplen harmonics in the secondary windings of each transformer.Fundamental current imbalance shall be reduced on the primary when compared to the secondary load measurements.Harmonic treatment shall be through electromagnetic means; filters, capacitors, power electronic circuitry or other such devices shall not be used to treat harmonics.Thermal SensorsWhen required, provide transformers with a thermal sensor set at 190 degrees C. Provide a second thermal sensor set at 175 degrees C when required. Thermal sensor(s) shall be factory-installed in the center coil of the transformer and factory-wired to a terminal strip. Thermal sensors shall consist of a set of dry contacts.wiring/terminationsRecommended external cable shall be rated 90 degrees C (sized at 75 degrees C ampacity) for encapsulated and 75 degrees C for ventilated designs. Connectors should be selected on the basis of the type and cable size used to wire the specific transformer.enclosureThe enclosure shall be made of heavy-gauge [steel] [Grade 304 stainless steel][Grade 316 stainless steel]. All transformers shall be equipped with a wiring compartment suitable for conduit entry and large enough to allow convenient wiring. The maximum temperature of the enclosure shall not exceed 90 degrees C per UL requirement. The core of the transformer shall be grounded to the enclosure.On three-phase units rated [75 kVA and below] [45 kVA and below] [30 kVA and below] [15 kVA and below] [9 kVA and below] and single-phase units rated [37.5 kVA and below] [25 kVA and below] [15 kVA and below] [10 kVA and below] the enclosure construction shall be encapsulated, totally enclosed, non-ventilated, [NEMA 3R][NEMA 4X] , with lifting provisions.On three-phase units rated [15 kVA and above] [30 kVA and above] [45 kVA and above] [75 kVA and above] [112.5 kVA and above] and single-phase units rated [15 kVA and above] [25 kVA and above] [37.5 kVA and above] [50 kVA and above] the enclosure construction shall be ventilated, NEMA 2, drip-proof, with lifting provisions. All ventilation openings shall be protected against falling dirt. On outdoor units, provide weathershields over ventilated openings.Ventilated type transformers that meet 10 CFR Part 431 efficiency requirements, with a core size of 150 kVA or less, shall be suitable for installation with 2-inch clearance from a wall or other obstruction behind the transformer enclosure.finishSteel enclosures shall be finished with ANSI 61 color, weather-resistant enamel. Stainless steel enclosures shall not be painted.OPTIONAL accessoriesOn ventilated outdoor units provide suitable weathershields over ventilation openings. Lug kits shall be provided by the Manufacturer of the transformerProvide hinged, padlockable front cover to facilitate visual inspection and infrared scanning.Provide infrared viewing windows of size and quantity to scan the terminals of the transformer.Provide surge protective device rated [80][160] kA per phase integral to the transformer enclosure. The surge protective device shall be installed on the [primary][secondary] of the transformer. Provide an indicating light that is visible on the outside of the transformer enclosure that shows if the surge protective device is operating.executionfactory testingThe following standard factory tests shall be performed on the equipment provided under this section. All tests shall be in accordance with the latest version of ANSI and NEMA standards.Ratio tests at the rated voltage connection and at all tap connectionsPolarity and phase relation tests on the rated voltage connectionApplied potential testsInduced potential testNo-load and excitation current at rated voltage on the rated voltage connectioninstallationThe Contractors shall install all equipment per the manufacturer’s recommendations and the contract drawings.field adjustmentsAdjust taps to deliver appropriate secondary voltage.field testingMeasure primary and secondary voltages for proper tap settings. ................
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