1、09-10 26 35 26 - 1 SECTION 26 35 26 HARMONIC FILTERS SPEC WRITER NOTE: 1. Delete between /_/ if not applicable to project. Also delete any other item or paragraph not applicable to the selection and renumber the paragraphs. 2. Harmonic mitigation equipment is suggested for adjustable frequency drive
2、s 30 HP and above, and for areas in an electrical distribution system that are unusually rich in switch-mode power supplies and other non-linear loads. 3. It is suggested that the A/E model the harmonic-producing loads and use the load kVA, the harmonic profile of the load current, and the configura
3、tion of the electrical system to determine the type(s) of active and/or passive filters to be employed. PART 1 - GENERAL 1.1 DESCRIPTION This section specifies the furnishing, installation, and connection of harmonic mitigation filter equipment. 1.2 RELATED WORK /A. Section 13 05 41, SEISMIC RESTRAI
4、NT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Requirements for seismic restraint of nonstructural components./ B. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements and items common to more than one section of Division 26. C. Section 26 05 21, LOW-VOLTAGE E
5、LECTRICAL 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 for providing a low impedance path for possible ground fault currents. E. Section 26 05 33, RACEWAY AND BOXES FOR E
6、LECTRICAL SYSTEMS: Conduits and outlet boxes. 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALIFICATIONS, in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. 1.4 SUBMITTALS A. In accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, submit the following: Provided by
7、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 35 26 - 2 B. Shop Drawings: 1. Clearly present sufficient information to determine compliance with drawings and specifications. 2. Include electrical ratings, dimensions, weights, mounting details and mate
8、rials, terminations, and connection diagrams. 3. Complete nameplate data including manufacturers name and catalog number. SPEC WRITER NOTE: Include the paragraphs below when harmonic filters are used in conjunction with adjustable frequency drives. /4. Calculated harmonic analysis that predicts the
9、full-load voltage and current harmonic distortion at the bus to which the adjustable frequency drives are connected. /5. Letter from manufacturer demonstrating compatibility between the harmonic mitigation equipment and the adjustable frequency drives proposed for the project./ C. Manuals: 1. When s
10、ubmitting 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 originally submitted maintenance and operating manuals, then two weeks prior to final inspection, submit four co
11、pies of updated maintenance and operating manuals to the /Resident Engineer/ /COTR/. D. Certification: Two weeks prior to the final inspection, submit four copies of the following to the /Resident Engineer/ /COTR/: Certification by the contractor that the equipment has been properly installed, adjus
12、ted, and tested. 1.5 APPLICABLE PUBLICATIONS A. 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. B. Institute of Electrical and Electr
13、onics Engineers (IEEE): 519-92, Section 6 Harmonic Control in Electrical Power Systems 1100-05 Powering and Grounding Electronic Equipment C. National Fire Protection Association (NFPA): 70-08 National Electrical Code (NEC) D. Underwriters Laboratories, Inc. (UL): 508-08 . Industrial Control Equipme
14、nt SPEC WRITER NOTE: Edit the paragraphs below to conform to project requirements. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 35 26 - 3 Select type(s) of filter best suited to the project. Choose type of filters based on the harmonic li
15、ne and neutral current profile of the load. Choose HP, kVA, or A rating of filtering equipment appropriate to the load requiring harmonic mitigation, and show on the drawings. Show series or parallel connection to the load. PART 2 - PRODUCTS 2.1 PASSIVE HARMONIC FILTER SPEC WRITER NOTE: Edit the par
16、agraphs below to conform to project requirements. Provide each /adjustable frequency drive/ /set of two adjustable frequency drives/ /nonlinear load/ as shown on drawings with a three-phase, three-wire external harmonic filter with the following requirements: 1. The filter shall treat low frequency
17、harmonics (5th, 7th, 11th, 13th, etc.) by a passive inductor/capacitor network. 2. The filter shall not resonate with system impedances. 3. The filter shall not introduce capacitive reactive power (kVAR) greater than 20% of the filters kVA rating. 4. Total harmonic voltage distortion at the filter i
18、nput shall not exceed 5%. Individual harmonic voltage distortion at the filter input shall not exceed 3%. Total current demand distortion at the filter input shall not exceed 8%. 5. The filter efficiency shall not be less than 99%. 6. All internal wiring shall be copper. 7. NEMA /1/ /3R/ enclosure.
19、8. Refer to drawings for /kVA rating/ /HP/ /A/ and V ratings of the filter. 2.2 ACTIVE HARMONIC FILTER SPEC WRITER NOTE: Edit the paragraphs below to conform to project requirements. Three-wire filters are typically used for large adjustable frequency drive loads, and four-wire filters for filtering
20、 the grounded conductor of triplen harmonics introduced by switch-mode power supplies. Provide each /adjustable frequency drive/ /set of two adjustable frequency drives/ /nonlinear load/ as shown on drawings with a three-phase, /three-wire/ /four-wire/ external harmonic filter with the following req
21、uirements: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 35 26 - 4 1. The filter shall treat low frequency harmonics (3rd, 5th, 7th, 11th, 13th, etc.) by microprocessor-controlled active power electronics which switch the AC power to contr
22、ol the output. 2. Total harmonic distortion at the filter input shall not exceed 5%. 3. Power factor correction to 0.98 minimum. 4. Graphical display shall at a minimum show spectrum data, line voltage and current, harmonic current, and reactive current. 5. Refer to drawings for /kVA rating/ /HP/ /A
23、/ and V ratings of the filter. PART 3 - EXECUTION 3.1 ACCEPTANCE CHECKS AND TESTS A. Perform tests in accordance with the manufacturers recommendations. Include the following visual and mechanical inspections. 1. Compare equipment nameplate data with specifications and approved shop drawings. 2. Ins
24、pect physical and mechanical condition. 3. Inspect all field-installed bolted electrical connections, verifying tightness of accessible bolted electrical connections by calibrated torque-wrench method. 4. Perform specific inspections and mechanical tests as recommended by manufacturer. 5. Verify cor
25、rect equipment grounding. B. Perform the following electrical tests. /For adjustable frequency drive loads, perform test both with all drives in bypass mode and motors operating at full load, and with add drives and motors operating at full load./ Measure and record current and voltage total harmoni
26、c distortion at the filter input terminals, using harmonic measuring equipment with a current calibration certificate. Show voltage and current waveforms and total and individual harmonic spectrum analysis. 3.2 FOLLOW-UP VERIFICATION Upon completion of acceptance checks and tests, the contractor shall show by demonstration in service that the filters are in good operating condition and properly performing the intended function. - - - E N D - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
