26_13_14_-_PAD_MOUNTED_MEDIUM_VOLTAGE_SWITCHGEAR.pdf

26 13 14 - 1 Revised 09/19/14

SECTION 26 13 14

PAD MOUNTED MEDIUM VOLTAGE SWITCHGEAR

PART 1 - GENERAL

1.1 SECTION INCLUDES

A. “Medium Voltage Pad Mounted Switchgear” with compartmentalized interrupter switches with a common bus, in a single, self-supporting, low-height enclosure. Switchgear shall be suitable for use outdoors with underground, medium voltage electric power distribution. Source switch compartments shall have 3-pole, non-fused interrupter switches. Load switch compartments shall have, three, single-pole, fused interrupter switches. Enclosures shall be touch-safe and have integrity to not require fencing for additional protection.

B. Sectionalizing Cabinet

1.2 RELATED SECTIONS AND WORK

A. Refer to the One-Line Diagram for additional information.

1.3 QUALITY ASSURANCE

A. Manufacturer: Company specializing in medium voltage interrupter switches with five (5) years documented experience.

1.4 REFERENCES

A. IEEE C2 – National Electrical Safety Code B. IEEE C37.74 – Standard Requirements for Subsurface, Vault, and Padmounted Load-

Interrupter Switchgear and Fused Load-Interrupter Switchgear for Alternating Current Systems up to 38 KV

C. IEEE C57.12.28 – Standard for Pad-Mounted Equipment Enclosure Integrity D. NFPA 70 National Electrical Code

1.5 SUBMITTALS

A. Submit shop drawings indicating outline dimensions, enclosure construction, shipping splits, lifting and supporting points, electrical single line diagram, and equipment electrical ratings under the provisions of Section 26 05 00.

B. Submit product data for components and accessories.

C. Submit manufacturer's installation instructions under provisions of Section 26 05 00.

1.6 EXTRA MATERIALS

A. Submit maintenance materials under provisions of Section 26 05 00.

B. Submit two (2) insulated-handle tools designed for operating single-pole switches and installing fuses.

C. Provide one (1) set of spare fuses of each size and rating under provisions of Section 26 05 00.

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1.7 DELIVERY, STORAGE, AND HANDLING

A. Deliver products to site under provisions of Section 26 05 00.

B. Accept the switchgear on site and inspect for damage.

1.8 OPERATION AND MAINTENANCE DATA

A. Submit operation and maintenance data under provisions of Section 26 05 00.

B. Include fuse replacement, adjustment, and lubrication instructions.

PART 2 - PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. S&C Electric Company, Type PMH. Model shall be PME.

2.2 [PS-#]: SWITCHGEAR COMPONENTS

A. Outdoor, pad-mounted switchgear consisting of compartments of 3-pole, non-fused, air-break, load-interrupter switches and compartments containing three, single-pole, fused, air-break load-interrupter switches, with all switches connected to a common bus structure within a single, self-supporting enclosure.

B. The quantity and type of switches required in each compartment shall be as shown on the project one-line drawing. The 3-pole, non-fused switch compartment shall be connected to incoming power sources or shall be used to continue power source distribution loops. The compartments with three, single-pole, fused switches shall be used for power distribution to loads.

C. The switchgear shall be manually operated.

D. The switchgear shall be used at an operating system operating voltage of 13.2 kV, three-phase, 60-hertz.

E. The switchgear main bus shall be rated 600 amperes, three-phase, 60-hertz, continuous.

F. The switchgear main bus shall be aluminum.

G. The three-pole, load-interrupter switch compartment ratings shall be as follows:

1. Nominal voltage rating shall be a minimum of 14.4 kV.

2. Maximum voltage rating shall be a minimum of 17.5 kV.

3. The 3-pole switch BIL level shall be a minimum of 95 kV.

4. The 3-pole switch continuous current rating shall be 600 amperes.

5. The 3-pole switch load breaking / live switching capability shall be 600 amperes.

6. The 3-pole switch three-time duty-cycle fault-closing rating shall be a minimum of 36,400 amperes asymmetrical peak with a 14,000 amperes RMS symmetrical rating.

26 13 14 - 3 Revised 09/19/14

7. The 3-pole switch minimum short circuit rating shall be 36,400 amperes asymmetrical peak with a one-second short time withstand rating of 14,000 amperes RMS symmetrical.

8. The 3-pole switch shall be handle-operated with an external handle to allow three-pole, live switching of three-phase source circuits. A folding switch-operating handle secured within the switch-operating hub access shall be provided for each 3-pole switch unit.

H. The switchgear unit shall be UL listed, with the “UL Listed” symbol on the ratings label and nameplate.

2.3 ACCESSORIES

A. Supply the following base spacer for the switchgear to match the enclosure dimensions, to increase the cable-termination height:

1. Supply a 12-inch high base spacer.

2. The space shall be made of carbon steel finished to match the color of the switchgear.

3. The base space shall be non-compartmentalized.

B. Surge Arresters: Provide polymer-housed, metal-oxide surge arresters, base mounted at switch terminals and bus terminals in the switchgear incoming source compartments as shown on the project one-line drawing(s). The arresters shall be rated 15 kV.

C. Provide cable guides in three-pole switch and bus compartments.

D. Provide cable guides in single-pole, fused switch compartments.

E. Provide an inner barrier panel inside the switchgear enclosure door for each compartment secured by a recessed pentahead bolt(s) to meet NESC and RUS requirements for dead-front.

F. Ground stud in all compartments. Ground studs shall be provided in all compartments for each switch, fuse, or bus terminal and ground pad. The momentary rating of the ground stud shall equal or exceed the short circuit rating of the switchgear.

G. Each fused interrupter switch compartment shall have built-in storage racks for spare fuse refills. Supply three spare fuse refills for each fused compartment.

H. Supply a switchgear hot stick fuse handling and single-pole switching tool (such as a Grappler) as recommended by the switchgear manufacturer with the switchgear. The tool shall be supplied with a universal pole / hot stick rated for the 14.4 kV or 25 kV switchgear for which it is being supplied.

I. Supply the following maintenance devices with the switchgear:

1. Shotgun style clamp stick for installation of grounding jumpers and for use with voltage testers. The shotgun style clamp stick provided shall be suitable for the voltage rating of the switchgear. Also supply a storage bag for the clamp stick.

2. Supply a voltage tester with audio and visual signals with an adapter to work with the shotgun clamp stick. Supply a storage bag for the voltage tester. The tester supplied shall be suitable for the voltage rating of the switchgear.

26 13 14 - 4 Revised 09/19/14

3. Supply a set of three grounding jumper cables with eye-type clamps that can be installed with the shotgun clamp stick. Supply a storage bag for the grounding jumper cables.

J. The Electrical Contractor performing the field installation of cables to the switchgear shall supply and install outdoor rated, shielded cable termination kits with cable lugs. The cable lugs supplied by the Electrical Contractor shall be suitable for terminating the field-installed cable conductors to the switchgear cable terminal pads. The switchgear manufacturer shall provide clear and detailed information as to the lug requirements to terminate cable to the switchgear.

2.4 SWITCHGEAR FABRICATION

A. A ground connection pad shall be provided in each compartment of the switchgear. The pad shall have a short circuit rating equal to that of the switchgear unit.

B. The enclosure shall be of 11 gauge cold-rolled steel. To prevent unauthorized entry, access to the enclosure shall be from the front and rear only, and side sheets shall not be externally bolted. Doors shall be of 11 gauge cold-rolled steel, bulkhead type construction and shall be full length.

C. Doors shall accommodate padlocking, and shall have latching mechanisms that withstand both outward and lateral forces.

D. The compartment doors shall have a pentahead type of latch mechanism whereby the doors can only be opened with a pentahead socket wrench or tool.

E. The complete assemblies shall be integrally designed and produced by the manufacturer of the basic switching components. Furthermore, it shall be constructed in accordance with the minimum construction specifications of the fuse manufacturer to provide adequate space for fuse handling, and, if required for fuse exhaust, sufficient volume and venting, plus the necessary enclosure strength and rigidity.

F. At each interrupter switch or fused interrupter switch bay, a fiberglass reinforced polyester end barrier shall prevent inadvertent access when the enclosure door is opened.

G. A front barrier of insulated material shall be provided for each switch and fuse. Where the National Electric Safety Code applies, these barriers shall meet the requirement of Section 31G. When the switch or fuse is in the open position, the barrier can be inserted into the open gap to guard against inadvertent contact with live parts. Interphase and end barriers of the same insulating material shall be provided with each switch and each set of fuses as necessary to achieve required BIL ratings.

H. The integrated assembly, interrupter switches, power fuses, and enclosures shall safely withstand the effects of closing, carrying, and interrupting all possible currents up to the maximum short circuit rating of the switchgear.

I. Hazard Alerting Signs and Labels:

1. All external doors providing access to high voltage shall be provided by the switchgear manufacturer, with a suitable hazard alerting sign.

2. The inside of all doors providing access to high voltage shall be provided by the switchgear manufacturer, with a suitable hazard alerting sign.

26 13 14 - 5 Revised 09/19/14

3. Switch compartments shall be provided by the switchgear manufacturer, with a hazard sign indicating that switches may be energized by backfeeds.

4. Fuse compartments shall be provided by the switchgear manufacturer, with a hazard sign indicating that fuses may be energized by backfeeds.

5. Barriers used to prevent access to energized parts shall be provided by the switchgear manufacturer, with suitable hazard alerting signs.

J. Nameplates, Connection Diagrams, and Ratings:

1. The outside of each of the doors providing access to high voltage shall be provided with a nameplate indicating the manufacturer’s name, catalog number, model number, date of manufacture, and serial number.

2. The inside of the doors shall be provided with ratings label indicating the following:

a. Overall pad-mounted switchgear ratings including nominal voltage kV, maximum voltage kV, BIL voltage kV, power frequency in hertz, short circuit peak withstand current in amperes, short circuit one-second short-time withstand current in amperes RMS symmetrical, and short circuit MVA, three-phase symmetrical at rated nominal voltage.

b. Main bus ratings including continuous current in amperes, peak withstand current in amperes, and one-second, short-time withstand current in amperes RMS symmetrical.

c. Switch ratings including continuous current in amperes, load switching and load dropping current in amperes, peak withstand current in amperes, one-second, short-time withstand current in amperes RMS symmetrical, and three-time duty cycle fault closing current in amperes RMS symmetrical.

d. Fuse type and integral load interrupter ratings including maximum current in amperes, load switching and load dropping current in amperes, and duty-cycle, fault-closing current in amperes RMS symmetrical.

3. Include a three-line connection diagram showing the interrupter switches, fuses with integral load interrupters, and bus, along with the manufacturer’s model number, on the inside of each door and on the inside of each switch operating hub access cover.

2.5 FACTORY FINISHING

A. Clean surfaces before applying paint.

B. Apply corrosion-resisting primer to all surfaces.

C. Apply a finish color coating: ANSI Z55.1; Type 61 - Munsell 7GY3.29/1.5 – Dark Green.

26 13 14 - 6 Revised 09/19/14

2.6 [SC-#]: SECTIONALIZING CABINET

A. 15 KV, 3-phase, 600-amp load break elbow style. Pad-mount weatherproof enclosure with hinged diagonal cut removable cover, padlock hasp and pentahead bolt. Stainless steel hardware. Parking stands for all elbows. Fiberglass ground sleeve. Refer to one-line diagram for configuration.

a. Approved Manufacturers: Cooper Power Systems Secter, Electrical Equipment Inc. Type LPT, Maysteel CW300.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Deliver to job site and install in accordance with the manufacturer's instructions.

END OF SECTION