AMEND 3 SECTION 26 22 13 - B181 Transformers 09172020.pdf

LRXQ 172401 – Renovate Small Air Terminal, Bldg 181

April 2020

SECTION # 262213

HIGH EFFICIENCY K-7 TRANSFORMERS

SECTION 26 22 13 – HIGH EFFICIENCY K-7 TRANSFORMERS

PART 1 – GENERAL

1.1 WORK INCLUDED:

A. Copper-wound transformers exceeding US Department of Energy 2016 mandated minimum efficiency. These transformers shall be UL listed to feed a K-7 electronic equipment load profile and be optimized to minimize operating cost under light loading.

B. Compliance with full specification is required.

C. Basic compliance with NEMA TP1/EPACT2005, NEMA Premium, CEE Tier 1, or CSL3 is not sufficient to meet this specification due to the following:

1. Efficiencies must exceed the US DOE 2016 minimum requirement.

2. No load losses must comply with those defined in this specification.

3. Efficiency at low load and under nonlinear K-7 load must meet the minimum requirements of this specification.

4. K-7 listing per UL 1561 is required.

5. Comprehensive testing under linear and nonlinear loading is required to verify specified performance.

6. Performance submittals are required.

1.2 REFERENCES:

A. US Department of Energy, 10 CFR Part 431, April 18, 2013. Energy Conservation

Program: Energy Conservation Standards for Distribution Transformers; Final Rule.

B. DOE Test Method for Measuring the Energy Consumption of Distribution Transformers under Appendix A to Subpart K of 10 CFR part 431.

C. ANSI/NEMA ST 20 – Dry Type Transformers for General Applications.

D. NEMA Premium Efficiency Transformers Program.

E. Consortium for Energy Efficiency (CEE): Specification for Low-Voltage, Dry-Type

Distribution Transformers.

F. EPACT 2005 – United States Energy Policy Act 2005 / NEMA TP1 – Guide for Determining Energy Efficiency for Distribution Transformers.

G. NEMA TP1 – Guide for Determining Energy Efficiency for Distribution Transformers.

H. ANSI/NEMA TP-2 – Standard Test Method for Measuring Energy Consumption of

Distribution Transformers.

I. Metering Standards:

1. Computational algorithms per IEEE Std 1459-2000

2. UL 916, UL 61010C-1 CAT III

J. IEEE C57, 110-1998 – IEEE Recommended Practice for establishing transformer capability when feeding nonsinusoidal load currents.

K. IEEE Std C57.12.91-1995 Standard Test Code for Dry-Type Transformers.

L. IEEE-1100 – Recommended Practice for Powering and Grounding Sensitive Electronic

Equipment.

M. LEED – Leadership in Energy and Environmental Design, U.S. Green Building Council.

N. Seismic Qualification References: International Building Code, 2006/2009 Edition, California Building Code, 2007/2010 Edition, ASCE Standard 7, 2005 Edition to OSHPD CAN 2-1708A.5, Rev., ICC-ES AC 156, Effective 01/01/2007, OSHPD.

O. ISO 9001: 2008 – International Standards Organization – Quality Management System.

P. ISO 14001: 2004 – International Standards Organization – Environmental Management

System.

Q. ISO 17025 – International Standards Organization – General requirements for the competence of testing and calibration laboratories.

1.3 SUBMITTALS:

A. Submit product data including the following:

1. Test Reports per US DOE 10 CFR Part 431, NEMA TP2, of previously manufactured units – representative of the kVA range on the project, tested in ISO 17025 Certified Efficiency Test Lab, signed by test engineer, documenting history of production capability to comply with performance requirements of this specification.

2. Test Reports per factory ISO Nonlinear Load Test Program, signed by factory test engineer of previously manufactured units – representative of the kVA range on the project, tested in ISO 17025 Certified Efficiency Test Lab, documenting history of production capability to comply with performance requirement of this specification.

3. ISO 17025 Efficiency Test Lab Certificate where testing is performed.

4. Where one or more of the integrated transformer meter options is selected for this project, provide associated documentation.

5. Insulation system impregnate data sheet as published by supplier.

6. Construction details including enclosure dimensions, kVA rating, primary & secondary nominal voltages, voltage taps, BIL, unit weight

7. Basic Performance characteristics including insulation class, temperature rise, core and coil materials, impedances & audible noise level, unit weight

8. Documentation of UL listing of 2” clearance from ventilated surfaces

9. Inrush Current (typical 3 cycle recovery)

10. Short Circuit Current data: Primary & Secondary

11. Efficiency, Loss & Heat output Data

12. No load and full load losses per NEMA ST20

13. Linear load data @ 1/6 load

14. Linear load data @ 1/4, 1/2, 3/4 & full load

15. Linear Load efficiency @ 35% loading tested per NEMA TP-2.

16. Efficiency under K7 load profile at 16.7%, 25%, 50%, 75%, 100% of nameplate rating.

17. Factory ISO 9001 procedure describing nonlinear load test program

a. Meter and CT details including model, accuracy, serial numbers and calibration information.

18. 25 year Product Warranty Certificate

19. Copy of ISO 14001:2004 Certification

20. Copy of ISO 9001:2008 Certification

21. Documentation that materials used for shipment packaging meet the environmental requirements of this specification.

22. For LEED projects, provide the following additional submittal information:

a. Optimize Energy Performance: Provide baseline and proposed energy performance as defined in LEED-Submittal Template for this credit

b. Enhanced Commissioning: Provide installation and operations manual required by this credit for the Commissioning Agent

1.4 NONLINEAR LOAD TEST PROGRAM:

A. Nonlinear Load Testing shall be carried out by an ISO 17025 Certified Efficiency Test Lab, and follow a defined protocol, independently audited within the ISO system.

B. Efficiency shall be determined purely by measurements following IEEE Std C57.12.91-

1995 Standard Test Code for Dry-Type Transformers. Other methods are not acceptable.

C. The nonlinear load bank shall consist of phase-neutral equipment with a K-7 profile, representative of a mix of typical office receptacle loads.

D. Meters and CTs shall both be revenue class accurate and carry current calibration certificates. CTs shall be operated within their approved accuracy loading range. Dual meters shall gather simultaneous primary and secondary energy and harmonic data.

Meter and CT details including model, accuracy, serial numbers and calibration information.

E. Efficiency: Measurements shall be taken at multiple load levels and plotted to show compliance with specification and correlation to the designed efficiency curve.

F. Harmonic data including current and Voltage THD at the different load levels shall be included with the test report.

1.5 PACKAGING FOR SHIPMENT:

A. Transformers shall be packaged for shipment using materials that will have the least environmental impact:

1. Transformer Wrapping

a. Transformers shall be wrapped for shipment in a film coating that is 100% compostable and biodegradable.

2. Transformer Shipping Base

a. Transformers shall be shipped on a base that uses at least 50% less wood than traditional pallets.

b. Wood used in the shipping base shall be Forestry Stewardship Council

(FSC) certified as having been sustainably harvested.

3. Shall minimize or eliminate use of materials that are not commonly recycled at the destination.

4. Shall minimize labor, risk of injury and equipment damage, while handling from initial transportation through to final placement of the transformer.

1.6 DELIVERY, STORAGE AND HANDLING:

A. Store and protect products.

B. Store in a warm, dry location with uniform temperature. Cover ventilation openings to keep out dust, water and other foreign material.

C. Handle transformers using lifting eyes and/or brackets provided for that purpose. Protect against unfavorable external environment such as rain and snow, during handling.

1.7 WARRANTY:

A. Transformer shall carry a 25-year pro-rated warranty, which shall be standard for the product line.

B. Manufacturer warranty shall remain in effect through a qualified seismic event.

1.8 COMMERCIAL PRODUCT:

A. Transformer shall be a standard item in the manufacturer’s catalog.

1.9 FACTORY PRODUCT PERFORMANCE VALIDATION:

A. At time of order, the customer may request that the project engineer or other designated customer representative witness the performance testing of one or more of the transformers on the project at the manufacturer’s facility, along with a demonstration of integrated metering option if specified.

1.10 ON-SITE PERFORMANCE VALIDATON:

A. To insure that the products shipped to the job site meet this specification, provide on-site revenue class accurate efficiency and harmonic measurements of transformers once installed and operating at customer’s site. Data shall be collected from primary and secondary sides of the transformer simultaneously on a synchronized cycle by cycle basis. The use of two discrete meters that are not synchronized is not acceptable.

Sampling shall be of 10% of transformers on the project once installed and operating, as selected by Contracting Officer.

1.11 INTERNATIONAL STANDARDS ORGANIZATION REGISTRATION:

A. Registration of the manufacturer to current versions of the following ISO standards is required.

1. ISO 9001: 2008 – Quality Management System

2. ISO 14001: 2004 – Environmental Management System

PART 2 - PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS/PRODUCT:

A. Basis of Design: E-Saver 2016 by Powersmiths International Corp. Equal transformers meeting these specifications manufactured by others will be considered provided they meet performance requirement of this specification.

B. Manufacturers wishing to have products evaluated for acceptability and conformance with the performance requirements of this specification, shall provide detailed compliance and/or exception statements, along with the documentation required in the submittal section, including test documentation, signed by an engineer that confirms that the transformer meets the specified performance.

2.2 TRANSFORMER SPECIFICATION:

A. Compatibility: This product must facilitate the ability of the electrical system to supply a sinusoidal voltage in order to improve the long-term compatibility of the electrical system with both linear and nonlinear loads.

B. Copper-wound, 3-phase, common core, ventilated, dry-type, isolation transformer built to

UL1561, NEMA ST20 and other relevant NEMA, UL and IEEE standards; 200% rated neutral; 60Hz rated; Transformers 750 kVA and less, 600 volt primary and less, shall be UL Listed and CSA Approved. All terminals, including those for changing taps, must be readily accessible by removing a front cover plate. Windings shall be continuous with terminations brazed or welded. 10kV BIL.

C. Seismic Qualification: been seismically qualified in accordance with: International

Building Code, 2006/2009 Edition, California Building Code, 2007/2010 Edition, ASCE Standard 7, 2005 Edition to OSHPD CAN 2-1708A.5, Rev., ICC-ES AC 156, Effective 01/01/2007, OSHPD approved: OSP-0110-10.

1. Manufacturer warranty shall remain in effect through a qualified seismic event.

2. Unit shall remain operational and shall not suffer electric or mechanical damage within the limits of a qualified seismic event.

3. Certification Level: Short period spectral acceleration: SDS=1.5 g, Seismic importance factor: Ip=1.5, Installation height: z/h=1.0, Installation restrictions:

None – Valid for below grade, at grade and roof installations in floor mounted configuration.

(Optional Seismic Severe Level) Same as above but short period spectral acceleration:

SDS=2.28 g, includes seismic bracing option.

D. Insulation System:

1. Shall be NOMEX-based with an Epoxy Co-polymer impregnate for lowest environmental impact, long term reliability and long life expectancy.

2. Class: 220 degrees C.

3. Imp regnant Properties for low emissions during manufacturing, highest reliability and life expectancy.

4. Epoxy co-polymer.

5. VOC: less than 1.65 lbs/gal (low emissions during manufacturing)

6. Water absorption (24hrs @ 25C): less than 0.05% (superior insulation, longer life)

7. Chemical Resistance: Must have documented excellent performance rating by supplier.

8. Dielectric Strength: minimum of 3200 volts/mil dry (for superior stress, overvoltage tolerance)

9. Dissipation Factor: max 0.02 @ 25C to reduce aging of insulation, extending useful life.

E. Operating Temperature Rise: 115 degree C in a 40 degree C maximum ambient

F. Noise levels:

1. 3 dB quieter than NEMA ST-20

2. Every unit to meet this noise level. Production Test every unit. Data to be available upon request.

G. UL Listed & Labeled K-Rating: K-7 or higher

H. Enclosure type: Indoor Ventilated NEMA 1, sprinkler proof where indoors, outdoor public where outdoors.

I. Rear Clearance: UL Listed for 2” clearance from the wall rather than standard 6”. This capability shall be explicitly described on the nameplate of each unit.

J. Meets US Department of Energy Efficiency Level 4 up to 150kVA.

K. Meets US Department of Energy Efficiency Level 3 for 151kVA and larger.

L. Exceed minimum efficiency requirements of US Department of Energy, 10 CFR Part

431, April 18, 2013, Energy Conservation Program: Energy Conservation Standards for Distribution Transformers; Final Rule which takes effect January 1, 2016, and comply with the table of Maximum No Load Loses, efficiency requirements at 1/6 load, efficiency at 35% load per 10 CFR Part 431, and efficiency at 25% load under a K-7 load profile.

kVA

No load losses (Watts)

Efficiency @ 1/6 load

Efficiency @ 35% load (%)

Efficiency at 25% load under K-7 nonlinear load

15 47 97.85% 98.28 98.00%

30 71 98.27% 98.50 98.30% 45 97 98.40% 98.66 98.40% 75 135 98.63% 98.82 98.60%

112.5 195 98.70% 98.92 98.70% 150 235 98.80% 98.99 98.80% 225 330 98.90% 99.09 98.90% 300 400 98.95% 99.15 99.00% 500 650 99.00% 99.25 99.05%

M. Voltage Taps: For transformers 15kVA-500kVA, provide two 2-1/2% full capacity taps above and four 2-1/2% taps below nominal primary voltage.

N. Impedance: Between 3.0% and 6.0% unless otherwise noted.

O. Maximum Footprint for 115 degree C rise model in a NEMA 1 enclosure:

1. 18” Wide x 17” Deep x 27” High for 15kVA.

2. 26” Wide x 18” Deep x 30” High for 30, 45kVA.

3. 33” Wide x 22” Deep x 40” High for 75, 112.5kVA.

4. 38” Wide x 27” Deep x 48” High for 150kVA.

5. 38” Wide x 32” Deep x 52” High for 225, 300kVA.

6. 52” Wide x 38” Deep x 61” High for 500kVA.

P. TRANSFORMER OPTIONS TO BE SUPPLIED

1. Lockable Hinged Doors

a. Provide lockable hinged doors on the transformer to facilitate access in support of NFPA 70E/CSA-Z462 Arch Flash Standard to minimize arc flash risk when opening the enclosure of live equipment.

2. Integrated Access Port to Transformer Output Voltages and Currents to enable spot checks of load profile measurement without opening transformer enclosure

a. Supports NFPA 70E/CSA-Z462 Arc Flash Standard to provide operating data without opening transformer enclosure

b. Supply access to transformer output voltages and currents without opening the enclosure, via twistlock connectors, in support of NFPA 70E/CSA-Z642 Arc Flash Standard to avoid arc flash risk as associated with opening the enclosure of live equipment.

c. Currents shall be accessed via integrated FTRZ listed 333mV CTs.

3. Integrated Rotatable Infrared (IR) Viewing Port to address NFPA 70E/CSA-

Z462 Arc Flash Standard

a. Provide integrated rotatable IR viewing port that provides single point viewing point that enables the thermal scanning of all live connections including primary and secondary feeder terminations and taps without requiring opening of the transformer enclosure or exposure to live parts.

b. The port shall be easily usable by a wide variety of makes and models of commercially available thermal scanning devices, without requiring any proprietary connectors, adapters or other components.

c. Basis of performance: Powersmiths Rotatable IR Viewing Port.

d. For the installation of one or more fixed IR windows to be considered an acceptable alternative on this project, the transformer manufacturer shall provide detailed drawings prepared by a qualified engineer detailing how all live terminals will be viewable. The manufacturer shall commit that should all terminals not be viewable, once installed, the manufacturer shall rectify the situation at their own expense.

4. Electrostatic Shield: Each winding is independently single shielded with a full-width copper electrostatic shield.

5. Lug Kit: Supply with standard screw-type lugs as specified at time of order

6. Low Inrush: less than 6 times primary full load current with a 3% source impedance

PART 3 - EXECUTION

3.1 INSTALLATION:

A. Follow all national, state and local codes with respect to transformer installation.

B. Where sound level may be of concern, utilize the services of a recognized and established Acoustical Consultant to provide the proper installation environment to minimize noise and vibration.

C. Check for damage and loose connections.

D. Set the transformer plumb and level.

E. Mount transformer on vibration isolation pads suitable for isolating the transformer.

F. Provide Seismic restraints where required.

G. Coordinate all work in this Section with that in other sections.

H. Verify all dimensions in the field.

I. Adjust transformer secondary voltages to provide the required voltage at the loads.

J. Upon completion of the installation, an infrared scan shall be provided for all bolted connections. Correct any deficiencies. Repeat thermal scan 3 months after installation and prepare a report for the Contracting Officer.

K. PERFORMANCE VALIDATION: To insure that the products shipped to the job site meet this specification, provide on-site revenue class accurate efficiency and harmonic measurements of transformers once installed and operating at customer’s site. Data shall be collected from primary and secondary sides of the transformer simultaneously on a synchronized cycle by cycle basis. The use of two discrete meters that are not synchronized is not acceptable. Sampling shall be of 10% of transformers on the project once installed and operating, as selected by customer. Submit a detailed report to the project engineer.

L. Identify non-compliant products to the engineer and replace at no cost to the Government.

END OF SECTION 26 22 13