139_26 11 16.pdf

P-447 DD4 & Pier 3 Moderinization 204820999

SECTION 26 11 16

SECONDARY UNIT SUBSTATIONS

02/10

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 C57.12.13 (1982) Conformance Requirements for Liquid-Filled Transformers

ASTM INTERNATIONAL (ASTM)

ASTM A167 (2011) Standard Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip

ASTM A780/A780M (2009; R 2015) Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings

ASTM D923 (2007) Standard Practice for Sampling Electrical Insulating Liquids

ASTM D974 (2014; E 2016) Standard Test Method for Acid and Base Number by Color-Indicator Titration

ASTM D1535 (2014) Specifying Color by the Munsell System

ASTM D709 (2017) Standard Specification for Laminated Thermosetting Materials

ASTM D877 (2002; R 2007) Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes

ASTM D877/D877M (2013) Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes

ASTM D92 (2012a) Standard Test Method for Flash and Fire Points by Cleveland Open Cup Tester

ASTM D97 (2017a) Standard Test Method for Pour Point of Petroleum Products

SECTION 26 11 16 Page 1

FM GLOBAL (FM)

FM APP GUIDE (updated on-line) Approval Guide http://www.approvalguide.com/

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 100 (2000; Archived) The Authoritative Dictionary of IEEE Standards Terms

IEEE C2 (2017; Errata 1-2 2017; INT 1 2017) National Electrical Safety Code

IEEE C37.121 (2012) American National Standard for Switchgear-Unit Substations - Requirements

IEEE C37.20.3 (2013) Standard for Metal-Enclosed Interrupter Switchgear

IEEE C57.12.00 (2015) General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers

IEEE C57.12.29 (2014) Standard for Pad-Mounted Equipment

- Enclosure Integrity for Coastal Environments

IEEE C57.12.80 (2010) Standard Terminology for Power and Distribution Transformers

IEEE C57.12.90 (2015; Corr 2017) Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers

IEEE C57.98 (2011) Guide for Transformer Impulse Tests

IEEE C62.11 (2012) Standard for Metal-Oxide Surge Arresters for Alternating Current Power Circuits (>1kV)

INTERNATIONAL ELECTRICAL TESTING ASSOCIATION (NETA)

NETA ATS (2017; Errata 2017) Standard for Acceptance Testing Specifications for Electrical Power Equipment and Systems

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA ICS 6 (1993; R 2016) Industrial Control and Systems: Enclosures

NEMA LI 1 (1998; R 2011) Industrial Laminating Thermosetting Products

NEMA ST 20 (1992; R 1997) Standard for Dry-Type Transformers for General Applications

SECTION 26 11 16 Page 2

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2017; ERTA 1-2 2017; TIA 17-1; TIA 17-2;

TIA 17-3; TIA 17-4; TIA 17-5; TIA 17-6;

TIA 17-7; TIA 17-8; TIA 17-9; TIA 17-10;

TIA 17-11; TIA 17-12; TIA 17-13; TIA

17-14; TIA 17-15; TIA 17-16; TIA 17-17 )

National Electrical Code

ORGANISATION FOR ECONOMIC CO-OPERATION AND DEVELOPMENT (OECD)

OECD Test 203 (1992) Fish Acute Toxicity Test

U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)

EPA 712-C-98-075 (1998) Fate, Transport and Transformation Test Guidelines - OPPTS 835.3100- "Aerobic Aquatic Biodegradation"

EPA 821-R-02-012 (2002) Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms

UNDERWRITERS LABORATORIES (UL)

UL 467 (2013; Reprint Jun 2017) UL Standard for Safety Grounding and Bonding Equipment

1.2 RELATED REQUIREMENTS

Section 26 08 00 APPARATUS INSPECTION AND TESTING and Section 26 23 00 LOW-VOLTAGE SWITCHGEAR apply to this section, with the additions and modifications specified herein.

1.3 DEFINITIONS

Unless otherwise specified or indicated, electrical and electronicsd terms used in these specifications, and on the drawings, shall be as defined in

IEEE 100.

1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

As an exception to the transformer submittal requirements specified herein, liquid-filled transformers manufactured by ABB in South Boston, VA; by Cooper Power Systems in Waukesha, WI; or by Howard Industries in Laurel, MS need not meet the submittal requirements of this contract. Instead, the following shall be submitted:

a. A certification, from the manufacturer, that the technical requirements of this specification shall be met.

b. An outline drawing of the transformer with devices identified (paragraph entitled "Transformer Drawings," item a).

SECTION 26 11 16 Page 3

c. ANSI nameplate data of the transformer (paragraph entitled "Transformer Drawings", item b).

d. Routine and other tests (paragraph entitled "Transformer Routine and Other Tests"), shall be conducted by the manufacturer and may be witnessed by the government (paragraph entitled "Source Quality Control"). Provide transformer test schedule required by submittal item "SD-11 Closeout Submittals". Provide certified copies of the tests.

e. Provide acceptance test reports required by submittal item "SD-06 Test Reports".

f. Provide operation and maintenance manuals required by submittal item "SD-10 Operation and Maintenance Data".

1.4.1 Coordinated Submittal Reviews

SD-02 Shop Drawings

Unit Substation Drawings; G

Transformer drawings; G

Include wiring diagrams and installation details of equipment indicating proposed location, layout and arrangement, control panels, accessories, piping, ductwork, and other items that must be shown to ensure a coordinated installation. Wiring diagrams shall identify circuit terminals and indicate the internal wiring for each item of equipment and the interconnection between each item of equipment. Drawings shall indicate adequate clearance for operation, maintenance, and replacement of operating equipment devices. Submittals shall include the nameplate data, size, and capacity. Submittals shall also include applicable federal, military, industry, and technical society publication references.

SD-03 Product Data

Fuse curves; G

Secondary unit substation; G

Unit substation transformer (liquid-filled); G

Submittal shall include manufacturer's information for each component, device, and accessory provided with the transformer.

SD-06 Test Reports

Acceptance checks and tests; G

SD-07 Certificates

Paint coating system; G

Transformer Losses; G

FM Approval of Transformer Insulating Fluid; G

SECTION 26 11 16 Page 4

SD-09 Manufacturer's Field Reports

Load Interrupter Switch production tests; G

Unit substation transformer design tests (liquid-filled); G

Unit substation transformer routine and other tests (liquid-filled);

G

SD-10 Operation and Maintenance Data

Unit substations, Data Package 5; G

SD-11 Closeout Submittals

Assembled Operation and Maintenance Manuals; G

Equipment test schedule; G

1.5 QUALITY ASSURANCE

1.5.1 Drawing Requirements

1.5.1.1 Unit Substation Drawings

Drawings shall include, but are not limited to the following:

a. An outline drawing, with front, top, and side views showing incoming, transformer, and outgoing sections. Include switchgear information from Section 26 23 00 LOW-VOLTAGE SWITCHGEAR.

b. One-line diagram showing fused load interrupter switch, current transformers, meters, and ampere rating of bus bars.

c. Elementary diagrams and wiring diagrams with terminals identified, and indicating prewired interconnections between items of equipment and the interconnection between the items.

d. Time-current characteristic fuse curves (on full size logarithmic paper) for the load interrupter switch fuse.

1.5.1.2 Transformer Drawings

Drawings shall include, but are not limited to the following:

a. An outline drawing, with front, top, and side views.

b. ANSI nameplate data.

1.5.2 Paint Coating System

Submit IEEE C57.12.29 coating system performance requirement tests. When interrupter switchgear and transformer are provided by two different manufacturers, each one shall provide certification.

1.5.3 Transformer Losses

Submit certification from the manufacturer indicating conformance with the paragraph entitled "Specified Transformer Losses".

SECTION 26 11 16 Page 5

1.5.4 FM Approval of Transformer Insulating Fluid

Submit certification from the manufacturer indicating FM approval of the transformer insulating fluid.

1.5.5 Substation Product Data

Submittal shall include manufacturer's information for each component, device, and accessory provided with the equipment.

1.5.6 Test Reports

Submit report of acceptance test results as specified by paragraph entitled "Field Quality Control."

1.5.7 Regulatory Requirements

In each of the publications referred to herein, consider the advisory provisions to be mandatory, as though the word, "shall" had been substituted for "should" wherever it appears. Interpret references in these publications to the "authority having jurisdiction," or words of similar meaning, to mean the Contracting Officer. Equipment, materials, installation, and workmanship shall be in accordance with the mandatory and advisory provisions of NFPA 70 unless more stringent requirements are specified or indicated.

1.5.8 Standard Products

Provide materials and equipment that are products of manufacturers regularly engaged in the production of such products which are of equal material, design and workmanship. Products shall have been in satisfactory commercial or industrial use for 2 years prior to bid opening. The 2-year period shall include applications of equipment and materials under similar circumstances and of similar size. The product shall have been on sale on the commercial market through advertisements, manufacturers' catalogs, or brochures during the 2-year period. Where two or more items of the same class of equipment are required, these items shall be products of a single manufacturer; however, the component parts of the item need not be the products of the same manufacturer unless stated in this section.

1.5.8.1 Alternative Qualifications

Products having less than a 2-year field service record will be acceptable if a certified record of satisfactory field operation for not less than 6000 hours, exclusive of the manufacturers' factory or laboratory tests, is furnished.

1.5.8.2 Material and Equipment Manufacturing Date

Products manufactured more than 3 years prior to date of delivery to site shall not be used, unless specified otherwise.

1.6 MAINTENANCE

1.6.1 Assembled Operation and Maintenance Manuals

Manuals shall be assembled in durable, hard covered, water resistant binders. The manual shall be assembled and indexed in the order noted in a

SECTION 26 11 16 Page 6 table of contents. The contents of the assembled operation and maintenance manuals shall be as follows:

a. Manufacturer's O&M information required by the paragraph entitled, "SD-10 Operation and Maintenance Data."

b. Catalog data required by the paragraph entitled, "SD-03 Product Data."

c. Drawing required by the paragraph entitled, "SD-02 Shop Drawings."

d. Price for spare parts and supply list

e. Routine and field acceptance test reports

1.6.2 Operation and Maintenance Data

Submit operation and maintenance data in accordance with Section 01 78 23 OPERATION AND MAINTENANCE DATA and as specified herein.

1.7 WARRANTY

The equipment items shall be supported by service organizations which are reasonably convenient to the equipment installation in order to render satisfactory service to the equipment on a regular and emergency basis during the warranty period of the contract.

PART 2 PRODUCTS

2.1 PRODUCT COORDINATION

Products and materials not considered to be secondary unit substations and related accessories are specified in Section 33 71 02 UNDERGROUND ELECTRICAL DISTRIBUTION, Section 26 11 13.00 19 MEDIUM VOLTAGE SWITCHGEAR, and Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM.

2.2 SECONDARY UNIT SUBSTATION

Secondary Unit substations shall comply with IEEE C37.121 regardless of the kVA rating specified. Substation shall consist of incoming section, transformer section, and outgoing section as indicated. Substation shall be designed for outdoor service with ventilation openings and gasketing provided to ensure a weatherproof assembly under rain, snow, sleet, and hurricane conditions. Substations shall be subassembled and coordinated by one manufacturer and shall be shipped in complete sections ready for connection at the site. Where practicable, substation shall be shipped as one unit. External doors shall have provisions for padlocking.

2.2.1 Incoming Sections

The incoming section shall consist of a metal-enclosed interrupter switchgear section or an air-filled terminal chamber for connecting the incoming circuit directly or through a fused load interrupter switch to the transformer. If required for proper connection and alignment, include a transition section with the incoming section.

2.2.1.1 Incoming Section Enclosure

The incoming section enclosure shall be NEMA ICS 6 Type 3R, fabricated entirely of ASTM A167 type 304 or 304L stainless steel. Bases, frames and

SECTION 26 11 16 Page 7 channels of enclosure shall be corrosion resistant and shall be fabricated of ASTM A167 type 304 or 304L stainless steel. Base shall include any part of enclosure that is within 3 inches of concrete pad. Paint enclosure, including bases, ASTM D1535 light gray No. 61 or No. 49. Paint coating system shall comply with IEEE C57.12.29.

2.2.1.2 Cable Terminations

Provide medium voltage cable terminations as specified in Section 33 71 02

UNDERGROUND ELECTRICAL DISTRIBUTION.

2.2.1.3 Surge Arresters

IEEE C62.11, rated 9kV. Arresters shall be distribution class. Arresters for use at elevations in excess of 6000 feet above mean sea level shall be specifically rated for that purpose. Arresters shall be equipped with mounting brackets suitable for the indicated installations.

2.2.1.4 Load Interrupter Switch

IEEE C37.20.3, UL listed and labeled load interrupter switchgear. Provide a three-pole, single-throw, deadfront, metal-enclosed, load interrupter switch with manual stored energy operator. Switch shall be fused, with fuses mounted on a single frame and designed for easy inspection and fuse replacement. The switch shall be operated by a manually charged spring stored energy mechanism which shall simultaneously disconnect or connect ungrounded conductors. The moveable blade of the switch shall be deenergized when in the open position. The mechanism shall enable the switch to close against a fault equal to the momentary rating of the switch without affecting its continuous current carrying or load interrupting ability. A ground bus shall extend the width of the switch enclosure and shall be bolted directly thereto. Connect frame of unit to ground bus.

Provide rear-accessible grounding ball studs on the ground bus in each switch section for the purpose of grounding each switched circuit. The door shall have an inspection window to allow full view of the position of the three switch blades through the closed door. Switch shall have provision for padlocking in the open and closed positions. Switch/fuse integrated ratings shall be as follow:

Rated Maximum Voltage, kV

Rated Withstand Impulse Voltage, kV BIL

Continuous and Load Interrupting Current, A

Short-Circuit Current kA rms Sym

Short-Time / Fault-Close Current kA

15 95 600 38 61

Fuses shall be current limiting type rated approximately 175 percent of the transformer full-load rating and in accordance with the fuse manufacturer's recommendation.

2.2.1.5 Primary Protective Device Connection

Connections between the primary protective device and transformer shall be bus mounted on porcelain insulators, and sized and braced to withstand the specified short-circuit and short-time currents.

SECTION 26 11 16 Page 8

2.2.2 Transformer (Liquid-Filled) Sections

ANSI C57.12.13. FM Approved less-flammable liquid-filled. Transformer base, including the tank, radiators, flanges, base, lifting provisions, and hardware, shall be fabricated of ASTM A167 type 304 or 304L stainless steel.

Transformer base shall include any part of the transformer that is within 3 inches of concrete pad. Paint coating system shall comply with

IEEE C57.12.29.

2.2.2.1 Transformer Ratings

a. Cooling Class: KNAN-Liquid-filled, as indicated, self-cooled.

b. Frequency: 60 Hz.

c. Phases: Three phase.

d. Rated Kilovolt Amperes: As indicated

e. Voltage Rating: 11,500 v - 480Y/277 V. For GrdY - GrdY transformers, provide transformer with five-legged core design for third harmonic suppression.

f. Impedance: Minimum tested impedance shall not be less than 5.3 percent at 85 degrees C.

g. Insulation Level: 95 kV BIL

h. Temperature Rise: 65 degree C average winding temperature rise above a 30 degree ambient.

i. Provide copper transformer windings for all transformers rated 1 MVA and above.

j. Audible Sound Levels: Audible sound levels shall comply with the following:

kVA Range DECIBELS (MAX)

225-300 55

301-500 56

501-700 57

701-1000 58

1001-1500 60

1501-2000 61

2001-2500 62

2501-3000 63

3001-4000 64

SECTION 26 11 16 Page 9 chmoore Cloud chmoore Typewriter

PPI#139

2.2.2.2 Transformer Accessories

The transformer shall have the following accessories:

a. Four 2.5 percent full capacity taps, two above and two below rated primary voltage.

b. Tap changer, with external, pad-lockable, manual type operating handle, for changing tap setting when transformer is de-energized.

c. Insulated low-voltage neutral bushing with lugs for ground cable and removable ground strap.

d. Ground pads.

e. Liquid-level indicator with contacts for low liquid level alarm and low-liquid level trip. Fluid Level Relay (device 71Q): Provide a transformer insulating fluid level relay with associated accessories.

Equipment shall indicate the insulating fluid level of the transformer and shall have one single-pole, double-throw contacts for remote indication of low level for connection to Supervisory Control and Data Acquisition (SCADA) System and one single-pole, double-throw contacts for low-low level to trip the lockout relay. Provide Auxiliary trip indicating relay (device 74) as required indication and communication for SCADA..

f. Pressure-vacuum gage.

g. Liquid temperature indicator, dial type thermometer, with contacts for high temperature alarm and high-high temperature trip. The temperature settings of contacts shall be adjustable with initial settings of 60°C for alarm and 70°C for the trip point. The thermometer shall have a drag pointer, with reset, that indicates maximum temperature reached.

Fluid Thermal relay (device 26Q): Provide a transformer insulating fluid thermal relay, with associated accessories. Equipment shall indicate the insulating fluid temperature of the transformer and shall have one single-pole, double-throw contacts for remote indication of high temperature for connection to Supervisory Control and Data Acquisition (SCADA) System and one single-pole, double throw contacts for high-high temperature trip the lockout relay. Provide Auxiliary trip indicating relay (device 74) as required indication and communication for SCADA.

h. Drain and filter valves.

i. Pressure relief device, top mounted, Qualitrol series 208, fabricated of stainless steel components, designed for use in corrosive environments, with visual indicating flag and with alarm contacts for remote indication of operation for connection to Supervisory Control and Data Acquisition (SCADA) System. Pressure relief device shall be Qualitrol type.

j. Diagrammatic stainless steel or laser-etched anodized aluminum nameplate in accordance with IEEE C57.12.00 and as modified or supplemented by this section.

k. Transformer base with provisions for jacking and for rolling in either direction.

SECTION 26 11 16 Page 10

l. Lifting provisions.

m. Bolted transformer top or welded top with bolted handhole access.

n. Port and valve for Nitrogen filling.

o. Pressure-Vacuum Bleeder. Pressure and vacuum settings shall be adjustable between 3 and 12 psig.

p. Winding temperature indicator. Dial-type winding temperature gauge with contacts for high temperature alarm and high-high temperature trip. The temperature settings of contacts shall be adjustable. The device shall have a drag pointer, with reset, that indicates maximum temperature reached. Thermal relay (device 49): Provide a winding thermal relay, with associated accessories. Equipment shall indicate the winding temperature of the transformer and shall have one single-pole, double-throw contact for remote indication of high temperature for connection to Supervisory Control and Data Acquisition (SCADA) System and one single-pole, double-throw contact for high-high temperature to trip the lockout relay. Provide Auxiliary trip indicating relay (device

74) as required indication and communication for SCADA.

q. Pressure switch for low nitrogen blanket. Switch shall have alarm contacts for remote indication of low nitrogen pressure for connection to Supervisory Control and Data Acquisition (SCADA) System.

r. Fault Pressure Relay (device 63): Provide a fault pressure relay sensitive to rate of rise of transformer tank pressure to detect internal faults in transformer windings. Fault pressure relay shall be wired to a compatible auxiliary seal-in relay (Device 63X), which shall trip the primary circuit breaker via the transformer lockout relay and shall have separate alarm contacts for communication to SCADA. Fault pressure relay shall be transformer mounted and auxiliary seal-in relay (device 63X) shall be located in the transformer terminal cabinet.

Auxiliary seal-in relay shall have 48VDC operating coil and trip-indicating targets.

s. Transformer terminal cabinet: All transformer accessories shall be wired to the terminal cabinet, for interface to SCADA, and for interface to switchgear protective devices. Provide light and switch inside Cabinet. Cabinet shall contain ring type terminal blocks rated 600V for connection to remote systems. All interconnecting wiring shall be copper, minimum 14 AWG and type SIS where routed to the lockout relay trip circuit. Control voltage shall come from the substation VDC source.

2.2.2.3 Specified Transformer Losses

No-load losses (NLL) shall be 2800 watts at 20 degrees C and load losses (LL) shall be 15,000 watts at 85 degrees C.

The values for the specified losses shall be used for comparison with the losses determined during the routine tests. If the routine test values for no-load losses exceed the specified no-load losses by more than 10 percent, or the total losses exceed the specified total losses (sum of no-load and load losses) by more than 6 percent, the transformer is unacceptable.

SECTION 26 11 16 Page 11

2.2.2.4 Insulating Liquid

a. Less-flammable transformer liquids: NFPA 70 and FM APP GUIDE for less-flammable liquids having a fire point not less than 300 degrees C tested per ASTM D92 and a dielectric strength not less than 33 kV tested per ASTM D877/D877M. Provide identification of transformer as "non-PCB" and indicate manufacturer's name and type of fluid on the nameplate.

The fluid shall be a biodegradable electrical insulating and cooling liquid classified by UL and approved by FM as "less flammable" fluids.

The fluid shall meet the following fluid properties:

1. Pour point: ASTM D97, less than -15 degree C

2. Aquatic biodegradation: EPA 712-C-98-075, 100 percent

3. Trout toxicity: OECD Test 203, zero mortality of EPA 821-R-02-012, pass

2.2.3 Outgoing Section

The outgoing section shall consist of a secondary transition section for connecting to a low-voltage switchboard or switchgear section as indicated.

The switchboard or switchgear shall be as specified in Section 26 23 00 LOW-VOLTAGE SWITCHGEAR. Connections between the transformer secondary bushings and the outgoing section transition bus shall be flexible braid bus. The secondary transition section shall have a hinged front panel.

2.2.3.1 Outgoing Section Enclosure

Provide outgoing section enclosure in accordance with the requirements in paragraph entitled, "Incoming Section Enclosure".

2.2.4 Heaters

Provide 120-volt heaters in incoming section and outgoing section. Heaters shall be of sufficient capacity to control moisture condensation in the compartments, shall be 250 watts minimum, and shall be controlled by a thermostat located in each section. Thermostat shall be industrial type, high limit, to maintain compartments within the range of 60 to 90 degrees F. If heater voltage is different than substation equipment voltage, provide transformer rated to carry 125 percent of heater full load rating.

Transformer shall have 220 degrees C insulation system with a temperature rise not exceeding 115 degrees C and shall conform to NEMA ST 20. Energize electric heaters while the equipment is in storage or in place prior to being placed in service. Provide method for easy connection of heater to external power source.

2.2.5 Insulated Barriers

Where insulated barriers are required by reference standards, provide barriers in accordance with NEMA LI 1, Type GPO-3, 0.25 inch minimum thickness.

2.2.6 Terminal Boards

Provide with engraved plastic terminal strips and screw type terminals for external wiring between components and for internal wiring between

SECTION 26 11 16 Page 12 removable assemblies. Terminal boards associated with current transformers shall be short-circuiting type. Terminate conductors for current transformers with ring-tongue lugs. Terminal board identification shall be identical in similar units. External wiring shall be color coded consistently for similar terminal boards.

2.2.7 Wire Marking

Mark control and metering conductors at each end. Provide factory-installed, white, plastic tubing, heat stamped with black block type letters on factory-installed wiring. On field-installed wiring, provide white, preprinted, polyvinyl chloride (PVC) sleeves, heat stamped with black block type letters. Each sleeve shall contain a single letter or number, shall be elliptically shaped to securely grip the wire, and shall be keyed in such a manner to ensure alignment with adjacent sleeves.

Provide specific wire markings using the appropriate combination of individual sleeves. Each wire marker shall indicate the device or equipment, including specific terminal number to which the remote end of the wire is attached.

2.2.8 Grounding and Bonding

Provide as specified in Section 33 71 02 UNDERGROUND ELECTRICAL

DISTRIBUTION.

2.2.9 Cast-in-Place Concrete

Concrete associated with electrical work for other than encasement of underground ducts shall be 4000 psi minimum 28-day compressive strength unless specified otherwise. All concrete shall conform to the requirements of Section 03 30 00 CAST-IN-PLACE CONCRETE.

2.3 MANUFACTURER'S NAMEPLATES

Each item of equipment shall have a nameplate bearing, as a minimum, the manufacturer's name, address, model number, and serial number securely affixed in a conspicuous place; the nameplate of the distributing agent will not be acceptable. Include additional information to fully identify the equipment. Nameplates shall be made of Type 316 stainless steel.

Equipment containing liquid dielectric shall include the type of dielectric on the nameplate. Sectionalizer switch nameplates shall have a schematic with all switch positions shown and labeled. As a minimum, provide nameplates for transformers, circuit breakers, meters, switches, switchboards and switchgear.

2.4 FIELD FABRICATED NAMEPLATES

ASTM D709. Provide laminated plastic nameplates for each secondary unit substation, equipment enclosure, relay, switch, and device; as specified in this section or as indicated on the drawings. Each nameplate inscription shall identify the function and, when applicable, the position. Nameplates shall be melamine plastic, 0.125 inch thick, white with black center core.

Provide red laminated plastic label with white center core where indicated.

Surface shall be matte finish. Corners shall be square. Accurately align lettering and engrave into the core. Minimum size of nameplates shall be one by 2.5 inches. Lettering shall be a minimum of 0.25 inch high normal block style.

SECTION 26 11 16 Page 13

2.5 WARNING SIGNS

Provide warning signs for the enclosures of secondary unit substations having a nominal rating exceeding 600 volts.

a. When the enclosure integrity of such equipment is specified to be in accordance with IEEE C57.12.29, such as for secondary unit substations, provide self-adhesive warning signs on the outside of the high voltage compartment door(s). Sign shall be a decal and shall have nominal dimensions of 7 by 10 inches with the legend "DANGER HIGH VOLTAGE" printed in two lines of nominal 2 inch high letters. The word "DANGER" shall be in white letters on a red background and the words "HIGH VOLTAGE" shall be in black letters on a white background. Decal shall be Panduit No. PPSO710D72 or approved equal.

b. When such equipment is guarded by a fence, mount signs on the fence.

Provide metal signs having nominal dimensions of 14 by 10 inches with the legend "DANGER HIGH VOLTAGE KEEP OUT" printed in three lines of nominal 3 inch high white letters on a red and black field.

2.6 SOURCE QUALITY CONTROL

2.6.1 Equipment Test Schedule

The Government reserves the right to witness tests. Provide equipment test schedules for tests to be performed at the manufacturer's test facility.

Submit required test schedule and location, and notify the Contracting Officer 30 calendar days before scheduled test date. Notify Contracting Officer 15 calendar days in advance of changes to scheduled date.

Test Instrument Calibration

1. The manufacturer shall have a calibration program which assures that all applicable test instruments are maintained within rated accuracy.

2. The accuracy shall be directly traceable to the National Institute of Standards and Technology.

3. Instrument calibration frequency schedule shall not exceed 12 months for both test floor instruments and leased specialty equipment.

4. Dated calibration labels shall be visible on all test equipment.

5. Calibrating standard shall be of higher accuracy than that of the instrument tested.

6. Keep up-to-date records that indicate dates and test results of instruments calibrated or tested. For instruments calibrated by the manufacturer on a routine basis, in lieu of third party calibration, include the following:

(a) Maintain up-to-date instrument calibration instructions and procedures for each test instrument.

(b) Identify the third party/laboratory calibrated instrument to verify that calibrating standard is met.

SECTION 26 11 16 Page 14

2.6.2 Load Interrupter Switch Production Tests

IEEE C37.20.3. Furnish reports of production tests performed on the actual equipment for this project. Required tests shall be as follows:

Production Tests

1. Dielectric

2. Mechanical operation

3. Grounding of instrument transformer case

4. Electrical operation and control wiring

2.6.3 Transformer Design Tests (Liquid-Filled)

In accordance with IEEE C57.12.00 and IEEE C57.12.90. Additionally, IEEE C57.12.80 section 5.1.2 states that "design tests are made only on representative apparatus of basically the same design." Submit design test reports (complete with test data, explanations, formulas, and results), in the same submittal package as the product data and shop drawings for each of the specified transformers. Design tests shall have been performed prior to the award of this contract.

a. Tests shall be certified and signed by a registered professional engineer.

b. Temperature rise: "Basically the same design" for the temperature rise test means a unit-substation transformer with the same coil construction (such as wire wound primary and sheet wound secondary), the same kVA, the same cooling type (KNAN), the same temperature rise rating, and the same insulating liquid as the transformer specified.

c. Lightning impulse: "Basically the same design" for the lightning impulse dielectric test means a unit-substation transformer with the same BIL, the same coil construction (such as wire wound primary and sheet wound secondary), and a tap changer, if specified. Design lightning impulse tests shall include both the primary and secondary windings of that transformer.

1. IEEE C57.12.90 paragraph 10.3 entitled "Lightning Impulse Test Procedures," and IEEE C57.98.

2. State test voltage levels.

3. Provide photographs of oscilloscope display waveforms or plots of digitized waveforms with test report.

d. Lifting and moving devices: "Basically the same design" for the lifting and moving devices test means a transformer in the same weight range as the transformer specified.

e. Pressure: "Basically the same design" for the pressure test means a unit-substation transformer with a tank volume within 30 percent of the tank volume of the transformer specified.

SECTION 26 11 16 Page 15

2.6.4 Transformer Routine and Other Tests (Liquid-Filled)

In accordance with IEEE C57.12.00 and IEEE C57.12.90. Routine and other tests shall be performed by the manufacturer on each of the actual transformers prepared for this project to ensure that the design performance is maintained in production. Submit test reports, by serial number and receive approval before delivery of equipment to the project site. Required tests and testing sequence shall be as follows:

a. Cold resistance measurements (provide reference temperature)

b. Phase relation

c. Ratio

d. Insulation power-factor by manufacturer's recommended test method.

e. No-load losses (NLL) and excitation current

f. Load losses (LL) and impedance voltage

g. Dielectric

1. Impulse: Per IEEE C57.12.90 paragraph 10.3 entitled "Lightning Impulse Test Procedures," and IEEE C57.98. Test the primary winding only.

(a) State test voltage levels

(b) Provide photographs of oscilloscope display waveforms or plots of digitized waveforms with test reports.

2. Applied voltage

3. Induced voltage

h. Leak

i. Sample insulating liquid. Sample shall be tested for:

1. Dielectric breakdown voltage

2. Acid neutralization number

3. Specific gravity

4. Interfacial tension

5. Color

6. Visual condition

7. Water in insulating liquid

8. Measure dissipation factor or power factor

j. Perform dissolved gas analysis (DGA)

SECTION 26 11 16 Page 16

PART 3 EXECUTION

3.1 INSTALLATION

Electrical installations shall conform to IEEE C2, NFPA 70, and to the requirements specified herein.

3.2 GROUNDING

NFPA 70 and IEEE C2, except that grounds and grounding systems shall have a resistance to solid earth ground not exceeding 5 ohms.

3.2.1 Grounding Electrodes

Provide driven ground rods as specified in Section 33 71 02 UNDERGROUND ELECTRICAL DISTRIBUTION. Connect ground conductors to the upper end of the ground rods by exothermic weld or compression connector. Provide compression connectors at equipment end of ground conductors.

3.2.2 Substation Grounding

Provide bare copper cable not smaller than No. 4/0 AWG not less than 24 inches below grade interconnecting the indicated ground rods. Surge arrester and neutrals shall be bonded directly to the transformer enclosure and then to the grounding electrode system with bare copper conductors, sized as shown. Lead lengths shall be kept as short as practicable with no kinks or sharp bends. Substation transformer neutral connections shall not be smaller than No. 1/0 AWG. When work in addition to that indicated or specified is directed to obtain the specified ground resistance, the provision of the contract covering "Changes" shall apply. Fence and equipment connections shall not be smaller than No. 4 AWG. Ground fence at each gate post and cornerpost and at intervals not exceeding 10 feet. Bond each gate section to the fence post through a 1/8 by one inch flexible braided copper strap and clamps.

3.2.3 Connections

Make joints in grounding conductors and loops by exothermic weld or compression connector. Exothermic welds and compression connectors shall be installed as specified in Section 33 71 02 UNDERGROUND ELECTRICAL DISTRIBUTION, paragraph regarding "Grounding".

3.2.4 Grounding and Bonding Equipment

UL 467, except as indicated or specified otherwise.

3.3 INSTALLATION OF EQUIPMENT AND ASSEMBLIES

Install and connect unit substations furnished under this section as indicated on project drawings, the approved shop drawings, and as specified herein.

3.3.1 Interrupter Switchgear

IEEE C37.20.3.

3.3.2 Field Applied Painting

Where field applied painting of enclosures is required to correct damage to

SECTION 26 11 16 Page 17 the manufacturer's factory applied coatings, provide manufacturer's recommended coatings and apply in accordance with manufacturer's instructions.

3.3.3 Field Fabricated Nameplate Mounting

Provide number, location, and letter designation of nameplates as indicated. Fasten nameplates to the device with a minimum of two sheet-metal screws or two rivets.

3.3.4 Warning Sign Mounting

Provide the number of signs required to be readable from each accessible side, but space the signs a maximum of 30 feet apart.

3.3.5 Galvanizing Repair

Repair damage to galvanized coatings using ASTM A780/A780M, zinc rich paint, for galvanizing damaged by handling, transporting, cutting, welding, or bolting. Do not heat surfaces that repair paint has been applied to.

3.4 FOUNDATION FOR EQUIPMENT AND ASSEMBLIES

3.4.1 Exterior Location

Mount unit substation on concrete slab. Unless otherwise indicated, the slab shall be at least 8 inches thick, reinforced with a 6 by 6 - W2.9 by W2.9 mesh placed uniformly 4 inches from the top of the slab. Slab shall be placed on a 6 inch thick, well-compacted gravel base. Top of concrete slab shall be approximately 4 inches above the finished grade. Edges above grade shall have 1/2 inch chamfer. The slab shall be of adequate size to project at least 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 caulking or sealant. Seals shall be of sufficient strength and durability to protect all energized live parts of the equipment from rodents, insects, or other foreign matter. Cut off and bush conduits 3 inches above slab surface, and provide grounding type bushings on metal conduit. Provide end bushings on non-metallic conduit. Provide Type 316 stainless steel bolts, hardware, washers, nuts and embedded anchors for securing transformers and unit substation sections in accordance with manufacturer's recommendations.

3.4.2 Interior Location

Mount unit substation on concrete slab. Unless otherwise indicated, the slab shall be at least 4 inches thick. The top of the concrete slab shall be approximately 4 inches above finished floor. Edges above floor shall have 1/2 inch chamfer. The slab shall be of adequate size to project at least 4 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 caulking or sealant. Seals shall be of sufficient strength and durability to protect all energized live parts of the equipment from rodents, insects, or other foreign matter. Cut off and bush conduits 3 inches above slab surface.

3.4.3 Cast-in-Place Concrete

Cast-in-place concrete work shall conform to the requirements of Section

03 30 00 CAST-IN-PLACE CONCRETE.

SECTION 26 11 16 Page 18

3.5 FIELD QUALITY CONTROL

3.5.1 Performance of Acceptance Checks and Tests

Perform in accordance with the manufacturer's recommendations and include the following visual and mechanical inspections and electrical tests, performed in accordance with NETA ATS.

3.5.1.1 Commissioning

Substation commissioning is a sequence of documentation reviews, equipment inspections and electrical tests essential to the acquisition and installation of reliable power distribution equipment.

Commissioning shall be performed per the Substation Commissioning Requirements Register plus the thermographic requirements specified in this section.

The Northwest 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. Refer to PSNS Bremerton Substation Commissioning Requirements Register (SCRR) included as an attachment to specification Section 26 08 00.

3.5.1.2 Interrupter Switchgear (Air Switches)

a. Visual and Mechanical Inspection

1. Compare equipment nameplate data with specifications and approved shop drawings.

2. Inspect physical and mechanical condition.

3. Confirm correct application of manufacturer's recommended lubricants.

4. Verify appropriate anchorage and required area clearances.

5. Verify appropriate equipment grounding.

6. Verify correct blade alignment, blade penetration, travel stops, and mechanical operation.

7. Verify that fuse sizes and types correspond to approved shop drawings.

8. Verify that each fuse holder has adequate mechanical support.

9. Inspect all bolted electrical connections for high resistance using low-resistance ohmmeter, verifying tightness of accessible bolted electrical connections by calibrated torque-wrench method and by performing thermographic survey in accordance with Section

5.1 of the Substation Commissioning Requirement Register.

10. Test interlocking systems for correct operation and sequencing.

11. Verify correct phase barrier materials and installation.

SECTION 26 11 16 Page 19

12. Compare switch blade clearances with industry standards.

13. Inspect all indicating devices for correct operation

b. Electrical Tests

1. Perform insulation-resistance tests.

2. Perform over-potential tests.

3. Perform resistance measurements through all bolted connections with low-resistance ohmmeter, if applicable.

4. Measure closed contact-resistance across each switch blade and fuse holder.

5. Measure fuse resistance.

6. Verify heater operation.

c. Test Values

1. Bolt-torque levels shall be in accordance with Table 11 of the Substation Requirements Commissioning Register unless otherwise specified by manufacturer.

2. The insulation shall withstand the over-potential test voltage applied.

3. Minimum insulation resistance shall be in accordance with manufacturer's published data or Table 12 of the Substation Commissioning Requirements Register. For maximum equipment rating of 15,000 volts the minimum DC test voltage shall be 2,500 volts and the recommended minimum insulation resistance shall be 5000 Megohms.

4. Clean, adjust, and retest contacts where any contact resistance values deviate from adjacent poles or similar switches by more than 25 percent. Repeat until this criteria is met. Where this criteria cannot be met, replace the equipment.

5. Replace fuses where fuse resistance values deviate from each other by more than 15 percent. Retest and repeat until no fuse of the same rating in the same circuit deviates by more than 15 percent.

3.5.1.3 Transformers (Liquid-Filled)

a. Visual and mechanical inspection

1. Compare equipment nameplate data with specifications and approved shop drawings.

2. Inspect physical and mechanical condition. Check for damaged or cracked insulators and leaks.

3. Verify operation of all alarm, control, and trip circuits from temperature and level indicators, pressure relief device, and fault pressure relay.

SECTION 26 11 16 Page 20

4. Inspect all bolted electrical connections for high resistance using low-resistance ohmmeter, verifying tightness of accessible bolted electrical connections by calibrated torque-wrench method and by performing thermographic survey in accordance with Section

5.1 of the Substation Commissioning Requirement Register.

5. Verify correct liquid level in transformer tanks and bushings.

6. Perform specific inspections and mechanical tests as recommended by manufacturer.

7. Verify correct equipment grounding.

8. Verify the presence of transformer surge arresters.

9. Inspect anchorage and alignment.

10. Verify presence of PCB labeling, if applicable.

11. Clean bushings and control cabinets.

12. Verify positive pressure maintained on gas-blanketed transformers.

13. Test load tap-changer.

14. Perform as-left tests.

15. Verify de-energized tap-changer position is left as specified.

16. Verify removal of any shipping bracing after final placement.

17. Inspect impact recorder prior to unloading, if applicable.

18. Verify that alarm, control, and trip settings on temperature indicators are as specified.

19. Verify tightness of accessible bolted electrical connections by calibrated torque-wrench method in accordance with manufacturer's published data or Substation Commissioning Requirements Register Table 11.

b. Electrical Tests

1. Perform resistance measurements through all bolted connections with low-resistance ohmmeter, if applicable.

2. Perform dissolved gas analysis (DGA).

3. Verify that the tap-changer is set at specified ratio.

4. Verify proper secondary voltage phase-to-phase and phase-to-neutral after energization and prior to loading.

5. Perform turns-ratio tests at the designated tap position.

6. Perform insulation power-factor or dissipation-factor tests on all windings in accordance with test equipment manufacturer's published data.

SECTION 26 11 16 Page 21

7. Perform power-factor or dissipation-factor tests on each bushing.

8. Perform excitation-current tests in accordance with the test equipment manufacturer's published data.

9. Measure the resistance of each winding at the designated tap position.

10. If the core ground strap is accessible, remove and measure the core insulation resistance at 500 volts dc.

11. Measure the percentage of oxygen in the gas blanket, if applicable.

12. Remove a sample of insulating liquid in accordance with ASTM D923.

The sample shall be tested for the following:

a) Dielectric breakdown voltage: ASTM D877 and/or ASTM D 1816

b) Acid neutralization number: ASTM D974

c) Specific gravity: ANSI/ASTM D 1298

d) Interfacial tension: ANSI/ASTM D 971 or ANSI/ASTM D 2285

e) Color: ANSI/ASTM D 1500

f) Visual Condition: ASTM D 1524

g) Water in insulating liquids: ASTM D 1533. (Required on 25 kV or higher voltages and on all silicone-filled units.)

h) Measure power factor or dissipation factor in accordance with

ASTM D974

13. Verify proper operation of the nitrogen blanket system and associated alarms. If transformer is not equipped with a nitrogen blanket system, insure that the nitrogen charge is within manufacturer's pressure specifications.

14. Verify proper operation of pressure relief and sudden pressure devices and associated alarm/trip functions.

15. Verify proper operation of manual no-load and automatic load-tap changers. Shop 03, Code 992.2, or N444.53 personnel shall witness verification.

16. Verify proper operation of high temperature and oil level relays and associated alarm/trip functions.

17. Verify that all required circuits to local SCADA cabinet are operating properly. All circuit wires shall be terminated on installer provided terminal boards within the local SCADA cabinet and shall be labeled at both ends of the wire. Each wire's label shall identify each circuit's source device.

c. Test Values

1. Bolt-torque levels shall be in accordance with Substation Commissioning Requirements Register Table 11 unless otherwise specified by manufacturer.

2. Insulation-resistance test values at one minute shall not be less than values recommended in Substation Commissioning Requirements Register Table 5. Resistance values to be temperature corrected in accordance with Substation Commissioning Requirements Register Table 13.

SECTION 26 11 16 Page 22

3. The polarization index shall be compared to manufacturer's factory test results. If manufacturer's data is not available, acceptance test results will serve as baseline data.

4. Turns-ratio test results shall not deviate more than one-half percent from either the adjacent coils or the calculated ratio.

5. Maximum power factor of liquid-filled transformers corrected to 20°C shall be in accordance with transformer manufacturer's published data. Representative values are indicated in Substation Commissioning Requirements Register Table 3. Compare with test equipment manufacturer's published data.

6. Clean and retest transformer bushings where bushing power factors and capacitances vary from nameplate values by more than ten percent. Clean and retest transformer bushings where any bushing hot collar watts-loss results exceed the test equipment manufacturer's published data. Repeat until criteria are met.

Where the criteria cannot be met, replace the equipment and test new equipment.

7. Typical excitation-current test data pattern for three-legged core transformer is two similar current readings and one lower current reading.

8. Consult manufacturer if winding-resistance measurements vary more than one percent from adjacent windings.

9. Consult manufacturer if core insulation is less than one megohm at 500 volts DC.

10. There shall be no indication of oxygen present in gas blanket.

11. Insulating liquid shall comply with Substation Commissioning Requirements Register Table 4.

d. Evaluate results of dissolved-gas analysis in accordance with IEEE Standard C57.104. Use results as baseline for future tests.

e. Refer to Section 26 23 00 LOW-VOLTAGE SWITCHGEAR, "FIELD QUALITY CONTROL", for load test requirements.

3.5.1.4 Grounding System

a. Visual and Mechanical Inspection

1. Inspect ground system for compliance with contract plans and specifications.

b. Electrical Tests

1. Perform ground-impedance measurements utilizing the fall-of-potential method. On systems consisting of interconnected ground rods, perform tests after interconnections are complete.

On systems consisting of a single ground rod perform tests before any wire is connected. Take measurements in normally dry weather, not less than 48 hours after rainfall. Use a portable ground testing megger in accordance with manufacturer's instructions to

SECTION 26 11 16 Page 23 test each ground or group of grounds. The instrument shall be equipped with a meter reading directly in ohms or fractions thereof to indicate the ground value of the ground rod or grounding…