18-1091_RFP_ Attch 11_Appendix 9- VSFB Electl GL 4_30_2020.pdf

VSFB Electrical Guidelines

General

Specify part numbers and manufacturer details when submitting materials and design

All pole hardware including down guys shall be stainless steel type 304 or 316 (316 preferred)

Porcelain insulators will not be allowed

All 12 kV current carrying conductors shall be copper.

Concrete or wooden poles allowed (Concrete poles highly preferred, south base must have concrete poles)

No stainless steel ground rods allowed

Open link type fuse cutouts are not acceptable

Provide sufficient insulated parking bushings to isolate underground wire from Padmount equipment

No direct buried UG wire allowed

Overhead Poles

Concrete pole and fiberglass composite crossarm strength shall meet or exceed the strength of the wood poles and crossarms for the specific classes and sizes as indicated on the drawings, and incorporating the

2017 National Electrical Safety Code (IEEE C2) or latest version listed load and strength factors for Grade B construction and the specific material

Concrete poles shall be spun-cast pre-stressed concrete, with minimum load rating of Class H, and equivalent to no less than wood pole Class 2, in addition to meeting the strength requirements listed above. Concrete poles shall be comply with applicable sections of RUS Bulletin 1724E-206

“Guide Specification for Spun Prestressed Concrete. Poles and Concrete Pole Structures.” All required holes shall be factory pre- drilled. Manufacturer recommend is StressCrete.

Climbing rungs shall be provided on each concrete pole, from 10’ above final grade after pole placement, up to lowest insulator-supporting crossarm or insulator base. From 4‘to 10’ above final grade, provide climbing rung attachment points.

Wood poles must be no less than Class 2 and treated with Pentacholorophenol

Overhead Crossarms

All crossarms for wood poles must be wood and treated with Pentacholorophenol

All crossarms for concrete poles must be fiberglass

Fiberglass crossarms and cross bracing assemblies shall be of UV-stabilized pultruded fiberglass construction, heavy-duty grade specifically designed for electrical utility use. Crossarms shall meet requirements of IEEE C2 for Grade B construction and shall be listed on the RUS list of materials acceptable for use. Tube interior shall be filled with closed-cell foam to prevent moisture ingress. Holes shall be factory pre-drilled. Provide factory installed endplates for crossarms. For 3 5/8” by 4 5/8” cross section, 10-foot length, mounted at center to pole, the manufacturer's listed ultimate vertical load per side shall be no less than 4800 lbs. Other lengths and cross-section sizes shall have proportionate load ratings. Manufacturers: Geotek “Pupi”;

Maclean Power Systems, A Division Of Maclean-Fogg Company; Creative Pultrusions Inc.

“Powertrusion Products”; or approved equal

Braces for fiberglass crossarms shall be UV-stabilized pultruded fiberglass and manufactured by the same manufacturer as crossarms; 3/8 inch (9.5 mm) thick by 1-1/4 inches (30 mm) wide, minimum, with length to suit crossarm dimensions. Any required metal hardware for crossarms and crossarm braces shall be of Type 316 stainless

Crossarms with center mount preferred over braced type

Conductors

For 12kV distribution lines, use copper wire

For 70kV transmission lines, use ACSR wire or submit an alternate for government approval

For 600 Volts or less service drop and underground lines must be copper wire

Underground phase conductors shall be copper tape shielded, copper conductor, 15KV rated

133% insulation level, 105℃ rating, UL type MV-105. Manufacturers recommended are Okonite and Southwire.

Overhead Air Switches

Air Switch Insulators must be rated no less than 25kV with 150 BIL rating for North and Main base, and no less than 35kV for South base

Surge arrestors shall not be needed for the air switches

Air switches must have a heavy duty metal crossarm or equivalent, fiberglass crossarm not allowed

All air switches must have a grounding platform

Pole-Mount Recloser

Recloser switches shall be per IEEE C37.63 where required. Reclosers shall have all of the features as the Schweitzer Model SEL 351R and be 100% compatible with the NOVA and Viper reclosers and be 100% compatible with the existing SCADA system at the base.

Overhead Hardware

Hardware must be type 304/316 stainless steel (type 316 preferred)

Overhead transmission and distribution support devices and connectors for must be heavy duty application

Fused Cutout/Lightning Arrester

Surge and Lightning Arrestors shall be in accordance with, IEEE C62.11 and NFPA 780

Cutouts & surge arresters must be distribution class polymer

Fuse Cutouts must be rated no less than 25kV for North and Main base, and no less than 35kV for South base

Use stainless steel mounting bracket for cutouts and Lighting arresters

Fuses

Fuse links must meet ANSI 37.42 and NEMA SG2.1 standards

Use Fuse Type K Only

Insulators

All insulators must be polymer

All overhead insulators, including spool, pin and bell type, shall be polymer type made of silicone alloy rubber with all stainless steel metal parts. Associated hardware, shank, locknuts, washers, etc. shall be manufactured stainless steel. Use broad-based corner pins of stainless steel for turning small angles.

Insulators must be rated no less than 25kV for North and Main base, and no less than 35kV for

South base

Transmission lines shall be rated no less than 115kV with extra leakage

Overhead Connectors

All connections shall be compression type, mechanical is not allowed

Stirrups shall be pre-manufactured compression type

Only stirrups built by a UL listed manufacturing company will be allowed

Hot-line clamps shall be screw in type fill with corrosion resistant compound

Pole Guys

Guy assemblies shall conform to IEEE C2. Guy strands shall be extra high-strength stainless steel. Provide guy terminations designed for use with the particular strand and developing at least the ultimate breaking strength of the strand. Guy Attachment, Thimble eye, and anchor rods shall be stainless steel of appropriate strength for the grade of construction of the line. Anchors shall be appropriate for highly corrosive environment. In areas of extremely high chemical activity of the soil, completely encase anchor rods and ground rods in concrete to point 4 inches above finished grade.

Screw anchors type only allowed.

Use fiberglass strain insulators

No guy strain insulators (Johnny Ball) allowed

Grounding

Ground rods shall be copper-clad steel or solid copper, not less than 3/4 inch in diameter by 10 feet in length

Grounding connections shall be exothermic weld type in accordance with UL 467

Raptor Protection Accessories

Shall meet VAFB environmental standards

Pad Mount Transformer

All stainless steel construction (includes tank, cabinet, base, radiators, fasteners, hinges, etc.)

“Pentahead” cabinet locking mechanism/device

Dead front construction (HV-200A load break elbows with shield adapters)

Externally clamped LV bushings with threaded copper stud for full load current below 2100 amperes – NEMA spades shall be provided per ANSI hole requirements

Radial feed

Loop feed must be approved by government

KVA: As required

Primary Voltage: 12kV Delta

Secondary Voltage: As required

3-Phase Transformer

Frequency: 60Hz

Windings: Copper

Mineral Oil-filled (Non-PCB): Type FR-3 Fluid

Standard impedance

Mild steel high-voltage/low-voltage compartment barriers

Cooling fins

Proper grounding provisions

Dial type gauges for oil temperature, liquid level and pressure/vacuum

Bay-O-Net fuses & current-limiting fuses: properly sized – additionally, the transformer will include 3 spare fuses

Two-position “ON/OFF” load break primary switch

5-position tap changer: (-5%, -2 ½ %, 0, +2 ½ %, +5%)

Automatic pressure relief device mounted on the terminal compartment

Oil drain valve with sampling device, and an oil fill/oil level plug

Nameplate and NEMA safety labels: include a “UL Listed” symbol on ratings label and nameplate

Compliant with 2016 DOE Efficiency Standard

Four (4) lifting lugs

Entire exterior of the pad-mount transformer and terminal components shall be painted with a munsell green, outdoor finish

Guaranteed to have an average coil winding temperature of 65°C rise over an average ambient air temperature of 30°C when operated at rated voltage and load conditions

Provide DGA test to verify conformance to performance requirements as outlined in the latest revisions of ANSI C57.12.00 and ANSI C57.12.90.

Pole Mount Transformer

Shall be in accordance with IEEE Std C57.12.31, 2010 or latest version

Shall meet or exceed ANSI and NEMA standards

Shall meet DOE Energy Efficiency Standard 10 CFR Part 431 for distribution transformers

Transformers must contain Envirotemp FR3 fluid

Transformers must have wet process porcelain high voltage bushings resistant to high voltage corona

Transformers shall be equipped with four 2 1/2 percent full capacity taps, 2 above and 2 below rated primary voltage and a tap changer that has an external handle

Transformers shall have tanks and covers that are corrosion resistant and are fabricated of stainless steel conforming to ASTM A167, Type 304 or 409 stainless steel.

Transformers shall receive a light gray, ANSI color No. 70 finish paint coating system that complies with IEEE C57.12.28 regardless of tank and cover material.

Transformer kVA capacity shall be indicated on each unit using 2 1/2 inch Arabic numerals placed near the low-voltage bushings

Core windings must be copper material

Must have tank grounding provisions

Laser engraved nameplate and corrosion proof

Underground Connectors

Cable terminations and cable joints shall be 3M or Elastimold Cold Shrink for outdoor use.

Primary Sectionalizing Cabinet

Must be stainless steel or fiberglass construction and approved by government first

Cabinets must meet ANSI C57.12.28 standard, ASTM D635, ASTM D543, ANSI/SCTE 77 and

UL 94

Cabinets must be fire retardant resin and self-extinguishing filler

Color must be Munsell green

Stainless steel parking stands

Provide insulated caps with test point and stud to allow repair or maintenance of underground wire

Underground Requirements

Primary cable ducts shall be minimum size 4 inches, non-metallic PVC conduits

Rigid Steel conduit shall be OCAL polyvinylchloride (PVC) coated in accordance with NEMA RN 1 due to VAFB corrosive environment.

A minimum of 1 spare conduit shall be installed in all underground cable ducts with 1/4-inch nylon pull rope.

One spare conduit shall include, capped risers into all pad-mounted equipment and to the base of any poles

Use 4 inch wide metallic warning tape to identify buried high voltage lines. Tape must be easy accessible for tracing. Method must be submitted for government approval.

Equipment Pads shall extend 12 inches beyond the equipment silhouette or footprint and shall provide both physical support for the equipment and serve a housekeeping function. Pads shall have a No. 4/0 bare copper cable counterpoise ground that shall be buried and shall encircle the pad. Equipment shall be attached as required by UFGS Section 13 4800-SEISMIC

PROTECTION FOR MISCELLANEOUS EQUIPMENT

Cable identification tag for handholes and manholes shall have the following:

o Circuit number o Circuit start point o Circuit destination o Cable quantity, size, voltage and insulation o Date installed

Tags shall be legible from center of the handholes or manholes