1、4-09 26 26 00 - 1 SECTION 26 26 00 POWER DISTRIBUTION UNITS FOR UNINTERRUPTIBLE POWER SYSTEMS SPEC WRITER NOTE: Delete between /-/ if not applicable to project. Also delete any other item or paragraph not applicable to the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION This se
2、ction specifies the furnishing, installation and connection of freestanding, prepackaged, power distribution units for transforming, conditioning, and distributing electrical power for a Central Uninterruptible Power Supply (UPS). 1.2 RELATED WORK /A. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS
3、 FOR NON-STRUCTURAL COMPONENTS: Requirement for seismic restraint for nonstructural Components./ B. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements and items that are common to more than one section of Division 26. C. Section 26 05 21, LOW-VOLTAGE ELECTRI
4、CAL 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 safety and to provide a low impedance path for possible fault currents. E. Section 26 05 33, RACEWAY AND BOXES FOR ELECTRICAL SYSTEM
5、S: Conduct and outlet boxes. F. Section 26 32 53, CENTRAL UNINTERRUPIBLE POWER SUPPY: Power source for power distribution units. 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALIFICATIONS, in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. 1.4 FACTORY TESTS Power distribution units shall
6、be thoroughly tested at the factory to assure that there are no electrical or mechanical defects. Tests shall be conducted as per UL and ANSI Standards. Factory tests shall be certified. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 26 00 -
7、 2 1.5 SUBMITTALS Submit in accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: A. Shop Drawings: 1. Sufficient information, clearly presented, shall be included to determine compliance with drawings and specifications. 2. Include electrical ratings, dimensions, mounting det
8、ails, materials, required clearances, terminations, weight, temperature rise, wiring and connection diagrams, plan, front, side, and rear elevations, accessories, and device nameplate data. B. Manuals: 1. Submit, simultaneously with the shop drawings, companion copies of complete maintenance and ope
9、rating manuals including technical data sheets, wiring diagrams, and information for ordering replacement parts. a. Wiring diagrams shall have their terminals identified to facilitate installation, maintenance, and operation. b. Wiring diagrams shall indicate internal wiring for each item of equipme
10、nt and the interconnection between the items of equipment. c. Provide a clear and concise description of operation, which gives, in detail, the information required to properly operate the equipment. d. Approvals will be based on complete submissions of manuals together with shop drawings. 2. Two we
11、eks prior to final inspection, deliver four copies of the final updated maintenance and operating manuals to the Resident Engineer. a. The manuals shall be updated to include any information necessitated by shop drawing approval. b. Complete “As Installed“ wiring and schematic diagrams shall be incl
12、uded which show all items of equipment and their interconnecting wiring. c. Show all terminal identification. d. Include information for testing, repair, trouble shooting, assembly, disassembly, and recommended maintenance intervals. e. Provide a replacement parts list with current prices. Include a
13、 list of recommended spare parts, tools, and instruments for testing and maintenance purposes. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 26 00 - 3 f. Furnish manuals in loose-leaf binder or manufacturers standard binder. C. Certificatio
14、ns: 1. Two weeks prior to final inspection, submit four copies of the following to the Resident Engineer: a. Certification by the Contractor that the assemblies have been properly installed, adjusted and tested. b. Certified copies of all of the factory design and production tests, field test data s
15、heets and reports for the assemblies. 1.6 APPLICABLE PUBLICATIONS Publications listed below (including amendments, addenda, revisions, supplements and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by designation only. A. National Fire Pro
16、tection Association (NFPA): 70 . National Electrical Code (NEC) 70E Standard for Electrical Life Safety in the Workplace B. National Electrical Manufacturers Association (NEMA): ST 20.Dry-Type Transformers for General Applications PB-1 . Panelboards AB-1 . Molded Case Circuit Breakers, Molded Case S
17、witches and Circuit Breaker Enclosures C. Underwriters Laboratories, Inc. (UL): 50 . Enclosures for Electrical Equipment 67 . Panel boards 489 Molded Case Circuit Breakers and Circuit Breaker Enclosures PART 2 - PRODUCTS 2.1 GENERAL A. Assembly of power line-conditioning and distribution components
18、packaged in a single cabinet or modular assembly of cabinets. Include the following components: 1. Input-power, circuit-breaker section. 2. Isolation transformer. 3. TVSS system. 4. Output panelboard(s). 5. Alarm, monitoring, and control system. Provided by IHSNot for ResaleNo reproduction or networ
19、king permitted without license from IHS-,-,-4-09 26 26 00 - 4 B. Unit shall carry indicated rms kilovolt-ampere load continuously without exceeding rated insulation temperature for the following input voltage and load current: 1. Input Voltage: Within rated input-voltage tolerance band of unit. 2. L
20、oad Current: Maximum of 3.0 crest factor. 2.2 INPUT CIRCUIT BREAKER SECTION A. 3-pole, shunt-tripped, /thermal-magnetic-type / /electronic-trip /circuit breaker, rated for indicated interrupting capacity and 125 percent of input current of unit at 100 percent rated load. 1. Dual-Input Units: a. Two
21、input circuit breakers arranged to provide transfer between two input-voltage sources. b. Controls and interfaces to allow both open- and closed-transition transfer between two input-voltage sources. 2.3 ISOLATION TRANSFORMER SECTION A. Dry-type, electrostatically shielded, three-phase, common-core,
22、 convection-air-cooled isolation transformer. 1. Comply with UL 1561. 2. Cores: Grain-oriented, non-aging silicon steel, one leg per phase. 3. Coil Material and Insulation: Copper windings with a 220 deg C insulation class. 4. Temperature Rise: Designed for 80 deg C rise above 40 deg C ambient. 5. O
23、utput Impedance: 3.5 plus or minus 0.5 percent. 6. Regulation: 2 to 4 percent maximum, at full-resistive load; 5 percent maximum, at rated nonlinear load. 7. K-factor: /K1/ /K13/ /K20/. 8. Taps: 6 full-capacity compensation taps at 2.5 percent increments; 2 above and 4 below nominal voltage. 9. Full
24、-Load Efficiency: Minimum 96 percent at rated load. 10. Magnetic-Field Strength External to Transformer Enclosure: Less than 0.1 gauss at 450 mm. 11. Audible Noise: Comply with NEMA ST 20. 12. Electrostatic Shielding: Independently shield each winding with a double-copper, electrostatic shield arran
25、ged to minimize interwinding capacitance. a. Coil leads and terminal trips shall be arranged to minimize capacitive coupling between input and output connections. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 26 00 - 5 b. Shield Terminal: S
26、eparate, and marked “Shield“ for grounding connection. c. Capacitance: Limit capacitance between primary and secondary windings to a maximum of 33 picofarads over a frequency range of 20 Hz to 1 MHz. d. Common-Mode Noise Attenuation: 120 dB minimum, 0.5 to 1.5 kHz; minus 65 dB minimum, 1.5 to 100 kH
27、z. e. Normal-Mode Noise Attenuation: Minus 52 dB minimum, 1.5 to 10 kHz. 13. Neutral Rating: 1.732 times the system full-load ampere rating. 2.4 TVSS SYSTEM Integrated TVSS system complying with Section 26 43 13, TRANSIENT- VOLTAGE SURGE SUPPRESSION to protect unit panelboard. 2.5 OUTPUT PANELBOARDS
28、 A. Description: Mount in front of power distribution units behind flush doors. Include the following features: 1. Construction: 42 pole, 240 V, 3 phase; capable of accepting branch circuit breakers rated to 100 A. 2. Bus Rating: 225 A, with main circuit breaker. 3. Phase, Neutral and Ground Buses:
29、Copper, with neutral bus at least 1.732 times the nominal phase bus rating. 4. Branch Circuit Breakers: Bolt on. 5. Cable Racks: Removable and arranged for supporting and routing cables for panelboard entrance. 6. Access Panels: Arranged so additional branch-circuit wiring can be installed and conne
30、cted in the future. 2.6 POWER DISTRIBUTION UNIT CONTROLS A. Include the following control features: 1. Emergency, power-off switch integral with power distribution unit. 2. Emergency, power-off input terminals for connection to remote power-off switch. 3. Over-under alarm shutdown with automatic uni
31、t disconnection for the following alarm conditions: a. High temperature. b. High and low input or output voltage. c. Phase loss. d. Ground fault. e. Reverse phase rotation. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 26 00 - 6 4. Ground-f
32、ault protection with automatic system shutdown. 5. Alarm Contacts: Electrically isolated, Form C (one normally open and one normally closed), summary alarm; contact set shall change state if any monitored function goes into alarm mode. 6. Remote Power-Off Control: Control circuit with connection to
33、shunt trip of power distribution unit main power circuit breaker and terminals for connection to one or more remote power-off, push-button stations. 7. Auxiliary Control Outputs: As shown on drawings. 2.7 MONITORING, STATUS, AND ALARM ANNUNCIATION A. Description: Microprocessor-based monitoring, sta
34、tus, and alarm annunciation panel mounted flush in front of power distribution unit to provide status display and failure-indicating interface for the following: 1. Power Monitoring: a. Input Voltage: Line to line, rms. b. Output Voltage: Line to line, rms. c. Output Voltage: Line to neutral, rms. d
35、. Output current. 2. Status Indication: Unit on. 3. Alarm Annunciation: a. High temperature. b. High and low input voltage. c. High and low output voltage. d. Phase loss. e. Ground fault. f. Frequency. g. Phase rotation. h. TVSS module failure. 4. Audible Alarm and Silencing Switch: Alarm sounds whe
36、n alarm indication occurs. Silencing switch shall silence audible alarm but leave visual indication active until failure or other alarm conditions are corrected. 2.8 SOUND LEVEL A. General: Fully assembled products comply with minimum sound-level requirements in NEMA ST 20 for transformers of corres
37、ponding ratings when factory tested according to IEEE C57.12.91. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 26 00 - 7 2.9 FINISHES Manufacturers standard finish over corrosion-resistant pretreatment and primer. PART 3 - EXECUTION 3.1 INS
38、TALLATION A. Coordinate installation of power distribution units with access flooring for proper support /and seismic restraint /of units. B. Arrange power distribution units to provide adequate access to equipment and circulation of cooling air. C. Anchor or restrain floor-mounting power distributi
39、on units according to manufacturers written instructions. /D. In seismic areas, equipment shall be adequately anchored and braced per details on structural contract drawings to withstand the seismic forces at the location where installed./ 3.2 CONNECTIONS A. Ground equipment according to Section 26
40、05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS. B. Connect wiring according to Section 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES (600 VOLTS AND BELOW). 3.3 ACCEPTANCE CHECKS AND TESTS A. Engage a factory-authorized service representative to inspect, test, and adjust component
41、s, assemblies, and equipment installations, including connections. Report results in writing to the Resident Engineer. B. Tests and Inspections: 1. Verify that power distribution units are installed and connected according to the Contract Documents. 2. Complete installation and startup checks accord
42、ing to manufacturers written instructions. 3. Compare equipment nameplate data with drawings and specifications. 4. Inspect physical and mechanical condition. 5. Inspect anchorage, alignment, and grounding. 6. Verify that resilient mounts are free and that any shipping brackets have been removed. 7.
43、 Clean power distribution unit. 8. Verify tightness of accessible bolted electrical connections by calibrated torque-wrench method in accordance with manufacturers published data. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 26 00 - 8 9. P
44、erform functional tests of power distribution units throughout their operating ranges. Test each monitoring, status, and alarm function. 10. Adjust power distribution units to provide optimum voltage to equipment served throughout normal operating cycle of loads served. Record input and output volta
45、ges and adjustment settings, and incorporate into test results. 11. Verify that as-left tap connections are as specified. 3.4 FOLLOWUP VERIFICATION Upon completion of acceptance checks, settings, and tests, the Contractor shall show by demonstration in service that the power distribution units are i
46、n good operating condition and properly performing the intended function. 3.5 DEMONSTRATION Engage a factory-authorized service representative to train Government maintenance personnel to adjust, operate, and maintain power distribution units. - - - END OF SECTION - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
