UNIFIED FACILITIES GUIDE SPECIFICATIONS. Use for Southeast projects only **************************************************************************

Transcription

1 USACE / NAVFAC / AFCESA / NASA UFGS (July 2006) Preparing Activity: NAVFAC Superseding Southeast UFGS-S-16345N (March 2001) Use in lieu of UFGS UNIFIED FACILITIES GUIDE SPECIFICATIONS Use for Southeast projects only SECTION TABLE OF CONTENTS DIVISION 26 - ELECTRICAL SECTION PAD-MOUNTED SWITCHGEAR 07/06 PART 1 GENERAL 1.1 REFERENCES 1.2 RELATED REQUIREMENTS 1.3 SUBMITTALS 1.4 QUALITY ASSURANCE Pad-Mounted Switchgear PART 2 PRODUCTS 2.1 PAD-MOUNTED SWITCHGEAR Electrical Ratings and Standards Switchgear Configuration Switchgear Enclosure Switch Construction Bushings Switch Operation SF6 Refill Cylinders Cable Connectors Load-Break Connectors Dead-Break Connectors Electronic Overcurrent Protection Vacuum Interrupter Switches 2.2 SOURCE QUALITY CONTROL Test Schedule Paint Qualification Tests Load-Break Switches Production and Design Tests Calibration Schedule Formal Request for Settings 2.3 NAMEPLATES AND WARNING SIGNS PART 3 EXECUTION 3.1 INSTALLATION 3.2 GROUNDING SECTION Page 1

2 3.2.1 Ground Girdle 3.3 INSTALLATION OF EQUIPMENT AND ASSEMBLIES Pad-Mounted Switchgear 3.4 FOUNDATION FOR EQUIPMENT AND ASSEMBLIES 3.5 FIELD QUALITY CONTROL Acceptance Checks and Tests Calibration Tests Follow-Up Verification -- End of Section Table of Contents -- SECTION Page 2

3 USACE / NAVFAC / AFCESA / NASA UFGS (July 2006) Preparing Activity: NAVFAC Superseding Southeast UFGS-S-16345N (March 2001) Use in lieu of UFGS UNIFIED FACILITIES GUIDE SPECIFICATIONS Use for Southeast projects only SECTION PAD-MOUNTED SWITCHGEAR 07/06 NOTE: This guide specification covers pad-mounted switchgear, but it does not cover all possible methods or requirements for providing pad-mounted switchgear. To do so would be to produce an involved, confusing document. This guide specification presents the usual methods and the most used alternatives. Different materials and methods, properly specified, indicated, and economically used will be acceptable when approved by cognizant authority. NOTE: Suggestions for improvement of this specification will be welcomed using the Navy "Change Request Forms" subdirectory located in SPECSINTACT in Jobs or Masters under "Forms/Documents" directory or DD Form Suggestions should be forwarded to: SECTION Page 3

4 Commanding Officer Naval Facilities Engineering Command Southern Division, Code 076 P. O. Box North Charleston, SC FAX: (843) NOTE: The following information shall be shown on the project drawings: 1. Where specification identifies type, size, color, finish, or other definitive information to be "as indicated," the engineer shall include the information on the drawings. 2. Location of pad-mounted switchgear, manholes, ducts, and cables. 3. Types of wire and cable; number and sizes of conductors. 4. Special conditions. PART 1 GENERAL 1.1 REFERENCES The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI C2 ANSI C ANSI C (1997) National Electrical Safety Code (1988; Correction 1988) Switchgear and Transformers - Pad-Mounted Equipment - Enclosure Integrity (1991) Pad-Mounted Equipment - Enclosure Integrity for Coastal Environments AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D 2472 (1992; R 1997) Sulfur Hexifloride INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE) ANSI/IEEE C37.60 (1981; R 1992) Overhead, Pad Mounted, Dry Vault, and Submersible Automatic Circuit Reclosers and Fault Interrupters for AC Systems SECTION Page 4

5 IEEE 386 (1995) Separable Insulated Connector Systems for Power Distribution Systems Above 600 V INTERNATIONAL ELECTRICAL TESTING ASSOCIATION (NETA) NETA ATS (1995) Electrical Power Distribution Equipment and Systems NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA) ANSI/NEMA C37.72 (1987) Manually-Operated, Dead-Front Padmounted Switchgear with Load Interrupting Switches and Separable Connectors for Alternating-Current Systems NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) NFPA 70 NFPA 70B (1999) National Electrical Code (1998) Electrical Equipment Maintenance 1.2 RELATED REQUIREMENTS Section BASIC ELECTRICAL MATERIALS AND METHODS, applies to this section, with the additions and modifications specified herein. 1.3 SUBMITTALS Submit the following in accordance with Section SUBMITTAL PROCEDURES. SD-02 Shop Drawings Pad-mounted switchgear; G [Calibration schedule] [Formal request for settings] SD-03 Product Data Pad-mounted switchgear; G Cable connectors; G [Electronic overcurrent protection; G] SD-06 Test Reports Acceptance checks and tests [Calibration tests] SD-09 Manufacturer's Field Reports Pad-mounted switchgear Production and design tests; G SECTION Page 5

6 Paint qualification tests; G Test Schedule SD-10 Operation and Maintenance Data Pad-mounted switchgear, Data Package 5 Submit Operation and Maintenance Manuals in accordance with Section OPERATION AND MAINTENANCE DATA. 1.4 QUALITY ASSURANCE Pad-Mounted Switchgear Submit drawings that include, but are not limited to, the following: a. Overall dimensions, front view, and sectional views b. Ampere ratings c. Maximum short-circuit bracing d. Interrupting rating e. One-line diagram [f. Manufacturer's original published time-current curves, not reproduced copies, (on full size logarithmic paper) of electronic overcurrent protection to ensure that protection and coordination are achieved.] PART 2 PRODUCTS 2.1 PAD-MOUNTED SWITCHGEAR Provide dead-front switchgear assemblies consisting of manually-operated, vacuum break, load interrupting, SF6 insulated, switches for pad-mount applications Electrical Ratings and Standards Design, build, and test switches per ANSI/NEMA C Provide switch assembly rated: Maximum design voltage, kv [15.5 [27 [38 Impulse level (BIL), kv (minimum) Ac 1-minute withstand, kv (minimum) Dc 15-minute withstand, kv (minimum) Continuous current, A Symmetrical interrupt rating, ka Momentary current withstand, ka asym second symmetric current withstand, ka 12] 12] 12] Switchgear Configuration Provide entrances suitable for cables entering from below. a. Number of entrance ways: [4] [ ] [as indicated] SECTION Page 6

7 b. Number of switched ways: [4] [ ] [as indicated] c. Switch positions: [CLOSED & OPEN] [d. Overcurrent protection: Vacuum Interrupter switches] Switchgear Enclosure ANSI/NEMA C37.72 and [ANSI C ] [ANSI C ]. NOTE: Where corrosion protection equivalent to stainless steel is needed, specify ANSI C a. Provide reinforced, tamper resistant, 12-gage steel enclosure Switch Construction Contain switch components and entrances in a factory welded single stainless steel tank braced to handle momentary and full load current duty. Factory fill with SF6 gas conforming to ASTM D 2472 before shipment. Include: a. Filling valve b. Lifting eyes c. Viewing windows to permit inspection of the switch contacts and nameplate indicating viewed position d. Gas pressure gage e. Grounding provisions for one12.7 mm 1/2 inch by 13 NC ground connection per switch-way plus provisions for one 12.7 mm 1/2 inch by 13 NC tank ground connection f. Corrosion resistant tank design using stainless steel and brass fasteners with no external aluminum parts g. One-line diagram and stainless steel nameplate fastened with stainless steel mechanical fasteners h. Compression spring operator i. Tank coating: Manufacturer's standard corrosion protective finish j. Operating mechanism capable of being locked in any position, with position indication and removable operating handle Bushings NOTE: Cable Size Bushings less than or equal to 4/0 AWG 200 Ampere SECTION Page 7

8 greater than or equal to 250 kcm 600 Ampere IEEE 386. [Provide 200 Ampere bushing well interfaces and 200 Ampere load-break inserts.] [and] [Provide 600 Ampere apparatus bushings.] Switch Operation Equip each switch-way with an internally-mounted operating mechanism capable of providing quick-make, quick-break operation in either switching direction. Provide mechanism capable of delivering sufficient force and with latches for each position to ensure load interrupting, fault closing, and momentary ratings. The mechanism shall use compression type springs. Identify each switch position by an engraved or embossed nameplate SF6 Refill Cylinders NOTE: Before including this paragrpah, verify with the station that refill cylinders are needed. Furnish [two] [ ] 6 pound (minimum) SF6 refill cylinders; and include regulator, valves, and hose for connection to the fill valve of the switch Cable Connectors NOTE: Cable Connectors Size Cable less than or equal to 4/0 AWG Load-Break greater than or equal to 250 kcm Dead-Break [ Load-Break Connectors IEEE 386. a. Rated: [95] [ ] kv BIL, [15] [ ] kv Class b. Current rating: 200 Amperes RMS continuous, Amperes RMS, symmetrical short time for a time duration of 0.17 seconds. c. Provide connectors, inserts, and bushings which are the product of a single manufacturer. d. Provide connectors which have a steel reinforced hook-stick eye, grounding eye, and arc-quenching contact material. ][ Dead-Break Connectors IEEE 386. a. Rated: [95] [ ] kv BIL, [15] [ ] kv Class b. Current rating: 600 Amperes RMS continuous, Amperes RMS, symmetrical short time for a time duration of 0.17 seconds. SECTION Page 8

9 c. Provide connectors, inserts, and bushings which are the product of a single manufacturer. d. Provide connectors which have a steel reinforced hook-stick eye, grounding eye, and arc-quenching contact material. ][2.1.9 Electronic Overcurrent Protection NOTE: When overcurrent protection is shown, include this paragraph and the paragraphs for calibration and settings. Provide vacuum interrupter switches to accomplish fault current circuit interruption. a. Include electronic control and adjustable trip settings, with an operating temperature range from -30 to +30 degrees C. b. Operation shall not require an external power source. c. Trip settings shall emulate "E" and "K" fuses, or relays Vacuum Interrupter Switches ANSI/IEEE C a. Type: Vacuum b. Design: 3-Phase, group-operated c. Ratings: (1) Maximum design voltage: [15.5 kv [27 kv [38 kv (2) Impulse level (BIL): 95 kv 125 kv 150 kv (3) Continuous & loadbreak: 600 Amps 600 Amps 600 Amps (4) 1 minute withstand AC: 34 kv 40 kv 50 kv (5) Symmetrical Interrupting rating: 12 ka 12 ka 12 ka (6) Asymmetrical Interrupting rating: 19.2 ka] 19.2 ka] 16 ka] ]2.2 SOURCE QUALITY CONTROL Test switchgear as integral assemblies at the switchgear manufacturer's test facility. A representative of The Southern Division, Naval Facilities Engineering Command will witness tests. Notify the Government 30 days before scheduling test date. Ship switchgear only after acceptance of test results has been received Test Schedule a. Submit Switchgear Test Schedule for tests to be performed and required reports. SECTION Page 9

10 b. Notify Contracting Officer 15 calendar days in advance of changes to scheduled dates and location for testing Paint Qualification Tests Submit reports showing that the paint qualification test has been performed according to [ANSI C ] [ANSI C ], to ensure the adequacy of enclosure finishes to inhibit the buildup of rust Load-Break Switches Production and Design Tests Submit reports which include results of production and design tests performed according to ANSI/NEMA C Production tests shall be performed by the manufacturer on each load-break switch to ensure that design performance is maintained in production. [2.2.4 Calibration Schedule a. Submit a Calibration Schedule including the anticipated dates when equipment requiring coordination and protection will be installed, the anticipated date when the Contractor will submit a formal request for settings, and the anticipated date when the manufacturer's technical representative will perform settings and calibrate equipment. b. Submit the Calibration Schedule, via the Contracting Officer to: SOUTHNAVFACENGCOM, Code 05, Construction Department SOUTHNAVFACENGCOM, Code 162; Director, Utilities Engineering Division ][2.2.5 Formal Request for Settings NOTE: The "30" days in brackets below may be extended for projects involving major electrical distribution work. Consult with Code 162. a. Where settings will be provided by the Government to achieve protection and coordination via relays and protective devices, submit a formal request for settings [30] days in advance of the date that settings will be needed, to allow the Contracting Officer to forward a copy of approved shop drawings to SOUTHNAVFACENGCOM; Code 162; Director, Utilities Engineering Division. b. The equipment requiring protection and coordination shall have been installed prior to making this request. c. Include approved shop drawings, manufacturer's instructions to set the protective devices, and manufacturer's time-current curves. d. Submit the Formal Request for Settings, via the Contracting Officer to: SOUTHNAVFACENGCOM; Code 162; Director, Utilities Engineering Division SECTION Page 10

11 ]2.3 NAMEPLATES AND WARNING SIGNS Provide as specified in Section BASIC ELECTRICAL MATERIALS AND METHODS. PART 3 EXECUTION 3.1 INSTALLATION Electrical installations shall conform to ANSI C2, NFPA 70, and to the requirements specified herein. 3.2 GROUNDING Provide grounding as indicated, conforming to ANSI C2, NFPA 70, and as specified in Section UNDERGROUND TRANSMISSION AND DISTRIBUTION Ground Girdle Provide a 1/0 bare copper-ground girdle around pad-mounted switchgear assemblies. Girdle shall be buried one-foot-deep and placed 3 feet laterally from the enclosure. Connect girdle to enclosure at two opposite places using 1/0 copper. Exothermically weld all joints. 3.3 INSTALLATION OF EQUIPMENT AND ASSEMBLIES Install and connect pad-mounted switchgear [and electronic overcurrent protection] furnished under this section as indicated on project drawings, the approved shop drawings, and as specified herein Pad-Mounted Switchgear ANSI/NEMA C [3.4 FOUNDATION FOR EQUIPMENT AND ASSEMBLIES [Provide as specified in Section PAD-MOUNTED TRANSFORMERS.] [Mount pad-mounted switchgear on concrete slabs. Unless otherwise indicated, the slab shall be at least 200 mm 8 inches thick, reinforced with a 150 x 150 mm - D-4 by D-4 6 by 6 - W2.9 by W2.9 mesh placed uniformly 100 mm 4 inches from the top of the slab. Slab shall be placed on a 150 mm 6 inch thick, well-compacted gravel base. The top of the concrete slab shall be approximately 100 mm 4 inches above the finished grade. Edges above grade shall have 15 mm 1/2 inch chamfer. The slab shall be of adequate size to project at least 200 mm 8 inches beyond the equipment. Provide conduit turnups and cable entrance space required by the equipment to be mounted. Seal voids around conduit openings in slab with water- and oil-resistant calking or sealant. Cut off and bush conduits 75 mm 3 inches above slab surface. Concrete work shall be as specified in [Section CAST-IN-PLACE CONCRETE] [Section UNDERGROUND TRANSMISSION AND DISTRIBUTION.]] ]3.5 FIELD QUALITY CONTROL Acceptance Checks and Tests Perform acceptance checks and tests in accordance with the manufacturer's SECTION Page 11

12 recommendations, NFPA 70B, and NETA ATS, as applicable to switchgear and referenced ANSI standards. Perform tests specific to switches in accordance with NETA ATS. [As an exception to NETA ATS requirements, provide services of manufacturer's technical representative to perform testing and calibration of protective devices. The Southern Division, Naval Facilities Engineering Command will witness formal tests after receipt of written certification that preliminary tests have been completed and that system is ready for final test and inspection.] Tests shall include those listed in NETA ATS for the specified equipment and the following: a. Compare actual connections with wiring diagrams. If differences are found, determine if error is in diagram or in actual wiring; correct as necessary. b. Inspect devices and equipment for damage or maladjustment caused by shipment or installation. c. Remove wedges, ties, and blocks installed by the manufacturer to prevent damage during shipment. [3.5.2 Calibration Tests Submit test result on electronic overcurrent protection via the Contracting Officer to SOUTHNAVFACENGCOM; Code 162; Director, Utilities Engineering Division. ]3.5.3 Follow-Up Verification Upon completion of acceptance checks, settings, and tests, the Contractor shall show by demonstration in service that circuits and devices are in good operation condition and properly performing the intended function. As an exception to requirements stated elsewhere in the contract, notify the Contracting Officer 10 working days in advance of the dates and times for checks, settings, and tests to allow the Contracting Officer to notify SOUTHNAVFACENGCOM Code 0742; Electrical Engineering Division and Code 162; Director, Utilities Engineering Division. -- End of Section -- SECTION Page 12