VA 26 22 00-2010 LOW-VOLTAGE TRANSFORMERS.pdf
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1、09-10 26 22 00 - 1 SECTION 26 22 00 LOW-VOLTAGE TRANSFORMERS SPEC WRITER NOTE: Delete between /_/ if not applicable to project. Also delete any other item or paragraph not applicable to the selection and renumber the paragraphs. PART 1 GENERAL 1.1 DESCRIPTION This section specifies the furnishing, i
2、nstallation, and connection of dry-type general-purpose transformers. 1.2 RELATED WORK /A. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Requirements for seismic restraint of nonstructural components./ B. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS:
3、General electrical requirements and items common to more than one section of Division 26. C. Section 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES (600 VOLTS AND BELOW): Cables and wiring. D. Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS: Requirements for personnel sa
4、fety and to provide a low impedance path for possible ground fault currents. E. Section 26 05 33, RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS: Conduits and outlet boxes. 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALIFICATIONS, in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. 1.4 SUBMITT
5、ALS A. In accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, submit the following: B. Shop Drawings: 1. Clearly present sufficient information to determine compliance with drawings and specifications. 2. Include electrical ratings, impedance, dimensions, weight, mounting de
6、tails, decibel rating, terminations, temperature rise, no load and full load losses, and connection diagrams. 3. Complete nameplate data, including manufacturers name and catalog number. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 22 00
7、- 2 C. Manuals: 1. When submitting the shop drawings, submit companion copies of complete maintenance and operating manuals, including technical data sheets and wiring diagrams. 2. If changes have been made to the maintenance and operating manuals originally submitted, then submit four copies of the
8、 updated maintenance and operating manuals to the /Resident Engineer/ /COTR/ two weeks prior to final inspection. D. Certifications: Two weeks prior to the final inspection, submit four copies of the following to the /Resident Engineer/ /COTR/: 1. Certification by the manufacturer that the materials
9、 conform to the requirements of the drawings and specifications. 2. Certification by the contractor that the equipment has been properly installed and tested. 1.4 APPLICABLE PUBLICATIONS A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of t
10、his specification to the extent referenced. Publications are referenced in the text by designation only. B. National Fire Protection Association (NFPA): 70-08 National Electrical Code (NEC) C. National Electrical Manufacturers Association (NEMA): ST20-92 Dry-Type Transformers for General Application
11、s TP1-02 . Guide for Determining Energy Efficiency for Distribution Transformers TR1-00 . Transformers, Regulators, and Reactors PART 2 - PRODUCTS 2.1 GENERAL PURPOSE DRY-TYPE TRANSFORMERS A. Unless otherwise specified, dry-type transformers shall be in accordance with NEMA, NEC, and as shown on the
12、 drawings. Transformers shall be UL-listed and labeled. B. Dry-type transformers shall have the following features: 1. Transformers shall be self-cooled by natural convection, isolating windings, indoor dry-type. Autotransformers will not be accepted. 2. Rating and winding connections shall be as sh
13、own on the drawings. 3. Transformers shall have copper windings. 4. Ratings shown on the drawings are for continuous duty without the use of cooling fans. 5. Insulation systems: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 22 00 - 3 a. Tr
14、ansformers 30 kVA and larger: UL rated 220 C system with an average maximum rise by resistance of 150 C in a maximum ambient of 40 C. b. Transformers below 30 kVA: Same as for 30 kVA and larger or UL rated 185 C system with an average maximum rise by resistance of 115 C in a maximum ambient of 40 C.
15、 6. Core and coil assemblies: a. Rigidly braced to withstand the stresses caused by short-circuit currents and rough handling during shipment. b. Cores shall be grain-oriented, non-aging, and silicon steel. c. Coils shall be continuous windings without splices except for taps. d. Coil loss and core
16、loss shall be minimized for efficient operation. e. Primary and secondary tap connections shall be brazed or pressure type. f. Coil windings shall have end filters or tie-downs for maximum strength. 7. Certified sound levels determined in accordance with NEMA, shall not exceed the following: Transfo
17、rmer Rating Sound Level Rating 0 - 9 KVA 40 dB 10 - 50 KVA 45 dB 51 - 150 KVA 50 dB 151 - 300 KVA 55 dB 301 - 500 KVA 60 dB SPEC WRITER NOTE: If a specific impedance is required to limit fault currents, verify that the transformer impedance is shown on the drawings. 8. If not shown on drawings, nomi
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