263214 ENGINE GENERATORS - 2000 KW.pdf

07-08M

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SECTION 26 32 14

ENGINE GENERATORS (2000 KW)

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies the furnishing, complete installation, connection and testing of the Campus Standby Power Engine Generator systems. This includes: air filtration, starting system, generator controls, paralleling switchgear, instrumentation, lubrication, fuel system, cooling system and exhaust system.

B. The engine generator system shall be fully automatic and shall constitute a unified and coordinated system ready for operation. New engines shall match existing installation (except voltage is 12,470 V).

C. The engine generator system shall include, but not be limited to the following:

1. Diesel Engine.

2. Lubrication Oil System.

3. Fuel Oil System.

4. Cooling System.

5. Integral Radiator.

6. Intake and Exhaust Air Systems.

7. Starting System.

8. Generator.

9. Controls, Supervision and Distribution.

10. Walk-in Outdoor Generator Enclosure.

11. Spare Parts.

1.2 RELATED WORK

A. Section 23 05 41, NOISE AND VIBRATION CONTROL FOR HVAC PIPING AND

EQUIPMENT: Requirements for pipe and equipment support and noise control.

B. Section 23 07 11, HVAC, PLUMBING, AND BOILER PLANT INSULATION:

Requirements for hot piping and equipment insulation.

C. Section 23 10 00, FACILITY FUEL SYSTEMS: Fuel supply and storage requirements.

D. Section 23 21 11, Boiler Plant Piping Systems and Section 23 10 00, FACILITY FUEL SYSTEMS for fuel-oil piping.

E. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements and items that are common to more than one section of Division 26.

F. Section 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES

(600 VOLTS AND BELOW: Cables and Wiring.

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G. Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS:

Requirements for personnel safety and to provide a low impedance path for possible ground fault currents.

1.3 QUALITY ASSURANCE

A. The supplier of the diesel-engine generator set shall be responsible for satisfactory total operation of the system and its certification. This supplier shall have had experience with three or more installations of systems of comparable size and complexity in regards to coordinating, engineering, testing and supervising. Each of these installations shall have been in successful operation for three or more years. Prior to review of submittals, the Department of Veterans Affairs reserves the right to:

1. Have the manufacturer submit a list of locations of similar installations.

2. Inspect any of these installations and operations of engine-generator set, and question the user concerning the installations without the presence of the supplier.

B. Factory authorized representative shall be capable of providing emergency maintenance and repairs at the project site within 8 hours maximum of notification.

C. Engine generator and auxiliary components shall be supplied from a single manufacturer.

D. Noise level developed by the generator set shall be as herein specified.

E. Factory Test: The Government shall have the option of witnessing the following tests at the factory. The Government will pay all expenses for the Government representative's trip to witness these tests. Contractor shall notify the Resident Engineer 15 days prior to date of testing.

Manufacturer shall furnish load banks, testing instruments and all other equipment as necessary to perform these tests.

1. Load Test: Shall include six hours of continuous operation; four hours while the set is delivering 100 percent of the specified KW and two hours while delivering 110 percent of the specified KW. During this test record the following data at 20-minute intervals:

Time Engine RPM Oil Temperature Out

KW Water Temperature In Fuel Pressure

Voltage Water Temperature Out Oil Pressure

Amperes Oil Temperature In Ambient Temperature

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2. Quick Start Test: Record time required for the engine generator set to develop specified voltage, frequency and KW load from a standstill condition.

1.4 SUBMITTALS

A. Submit in accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL

INSTALLATIONS.

B. Shop Drawings:

1. Sufficient information, clearly presented, shall be included to determine compliance with drawings and specifications.

2. Data shall be submitted in the following form:

a. Technical data sheets (TDS): These include published performance, rating and derating curves, published ratings, catalog cuts, pictures, manufacturer's specifications, material composition, and gauge thickness.

b. Description of operation (DO): Manufacturer's literatures and, if suitable, diagrams.

c. Calculations (CALC): Detailed engineering calculations with all equations, graphs, assumptions, and approximations shown, and data sources referenced.

d. Certification (CERT): Written confirmation as to the document's accuracy, and genuineness.

e. Shop Drawings (SD): Scaled drawings showing plan views, side views, elevations and cross sections.

f. Diagrams (DGM): These include control system diagrams, elementary diagrams, control sequence diagrams or table, wiring diagrams, interconnections diagrams (between local control cubicles, remote annunciator panels, remote derangement panels, remote monitoring panels, remote exercising panel and fuel storage tanks), wireless connection diagrams, illustrative diagrams, flow diagrams, and other like items.

3. Prior to fabrication, submit for approval the following data for each engine-generator set, control and supervisory equipment:

a. Engine generator set: TDS, SD including subtransient reactance and short-circuit current capacity.

b. Engine jacket water heaters: TDS

c. Muffler assembly: TDS, SD

d. Motor-operated damper assembly: TDS

e. Fuel pumps and integral sub-base fuel tank: TDS, CALC

f. Batteries, racks and charger: TDS, CALC

g. Torsional Vibration: CERT

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h. Control and Supervisory Equipment: TDS, DGM, DO, SD

i. Performance:

1) Voltage regulating equipment: TDS

2) Frequency regulating equipment: TDS

3) Voltage and frequency dips and recovery times due to specified motor loading: CALC

4) Antifreeze derating: TDS

5) Ambient derating: TDS

j. Vibration isolators: TDS, CALC

k. Sound power level data for the packaged outdoor generator.

l. Vibration isolation system performance data from no-load to full-load. This must include seismic qualification of the engine-generator mounting, base and vibration isolation.

C. Manuals:

1. Submit, simultaneously with the shop drawings, companion copies of complete maintenance and operating manuals of the engine generator set and auxiliaries including technical data sheets, wiring diagrams, and information, such as telephone number, fax number, and web sites, for ordering replacement parts.

2. Two weeks prior to the final inspection, submit four copies of the updated maintenance and operating manual to the Resident Engineer:

a. Include complete "As installed" diagrams, which indicate all items of equipment and their interconnecting wiring.

b. Include complete diagrams of the internal wiring for each of the items of equipment, including "As installed" revisions of the diagrams.

c. The wiring diagrams shall identify the terminals to facilitate installation, maintenance, operation and testing.

d. Complete lists of spare parts and special tools recommended for two years of normal operation of the complete system.

D. Certifications:

1. Prior to fabrication of the engine-generator set, submit the following for approval, to the Resident Engineer:

a. A certification in writing that a diesel engine of the same model and configuration, with the same bore, stroke, number of cylinders, and equal or higher BMEP and RPM ratings as the proposed diesel engine has been operating satisfactorily, with connected loads of not less than 75 percent of the specified

KW/KVA rating, for not less than 2,000 hours without any failure

001-10017-006 26 32 14 - 5 of a crankshaft, camshaft, piston, valve, injector or governor system.

b. A certification in writing that devices and circuits will be incorporated to protect the voltage regulator and other components of the auxiliary electrical power system during operation of the diesel engine-generator set at speeds other than the rated RPM while performing maintenance. Include thorough descriptions with submittal of any precautions, which will be necessary to protect the voltage regulator and other components of the system during operation of the diesel engine-generator set at speeds other than the rated RPM.

2. Prior to installation of the engine-generator sets at the job site, submit four copies of the following to the Resident Engineer:

a. Certified test data, alternator temperature rise test and strip chart recordings, and photographs showing test setup and equipment.

3. Two weeks prior to the final inspection, submit four copies of the following, to the Resident Engineer:

a. Certified test report by the manufacturer of the engine-generator set that the auxiliary electrical power system conforms to the requirements of the drawings and specifications.

b. Certified report of field tests from the contractor that the engine-generator set and major auxiliaries have been properly installed, adjusted and tested.

1.5 STORAGE AND HANDLING

A. Equipment shall withstand the mechanical stresses caused by rough handling during shipment in addition to the electrical and mechanical stresses, which occur during operation of the system. Protect radiator core with wood sheet.

B. Store the equipment in a location approved by the Resident Engineer.

1.6 JOB CONDITIONS

A. Shall conform to the arrangements and details shown on the drawings. The dimensions, enclosures and arrangements of the engine-generator sets shall permit the operating personnel to safely and conveniently operate and maintain the system in the space designated for installation.

B. Unless specified otherwise, each component of the engine-generator system shall be capable of operating as specified herein at 334 meters

(1000 feet) above sea level in a ventilated room which will have average ambient air temperatures ranging from a minimum of 0 degrees C (32

001-10017-006 26 32 14 - 6 degrees F) in winter to maximum of 49 degrees C (120 degrees F) in summer.

1.7 APPLICABLE PUBLICATIONS

A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by designation only.

B. American National Standards Institute (ANSI):

C37.50-00...............Low-Voltage AC Power Circuit Breakers used In

Enclosures-Test Procedures

C. American Society of Testing Materials (ASTM):

A53/A53M-04.............Standard Specification for Pipe, Steel, Black, and Hot–Dipped, Zinc Coated Welded and Seamless.

B88-03..................Specification for Seamless Copper Water Tube

B88M-03.................Specification for Seamless Copper water Tube

(Metric)

D. Institute of Electrical and Electronic Engineers (IEEE):

C37.13-95...............Low Voltage AC Power Circuit Breakers Used In

Enclosures

C37.90.1-02.............Surge Withstand Capability (SWC) Tests for

Relays and Relay Systems Associated with

Electric Power Apparatus

E. National Electrical Manufacturers Association (NEMA):

AB 1-02.................Molded Case Circuit Breakers and Molded Case

Switches and Circuit Breaker Enclosures

ICS 6-01................Industrial Control and Systems: Enclosures

ICS 4-05................Terminal Blocks, MG 1-04.................Motor and Generators

MG 2-01...........Safety Standard and Guide for Selection, Installation and use of Electric Motors and Generators

PB 2-01.................Dead-Front Distribution Switchboards

SG 3-95.................Low Voltage Power Circuit Breakers-Power

Switching Equipment

SG 5-95.................Power Switchgear Assemblies

250-03..................Enclosures for Electrical Equipment (1000 Volts

Maximum)

F. National Electrical Testing Association (NETA):

ATS-95..................Electrical Power Distribution Equipment and

Systems

G. National Fire Protection Association (NFPA):

30-03...................Flammable and Combustible Liquids Code.

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37-02...................Installations and Use of Stationary Combustion

Engine and Gas Turbines

70-05...................National Electrical Code (NEC)

99-05...................Health Care Facilities

110-05..................Standard for Emergency and Standby Power

Systems.

H. Underwriters Laboratories, Inc. (UL):

50-03...................Enclosures for Electrical Equipment

142-02..................Steel Aboveground Tanks for Flammable and

Combustible liquids

2085-95.................Insulated Aboveground Tanks for Flammable and

Combustible Liquids

2200-04.................Stationery Engine Generator Assemblies

1236-02.................Battery Chargers for Charging Engine-Starter

Batteries

467-04..................Grounding and Bonding Equipment.

489-04..................Molded-Case Circuit Breakers, Molded-Case

Switches and Circuit-Breaker Enclosures

508-05..................Industrial Control Equipment

PART 2 - PRODUCTS

2.1 DIESEL ENGINE-GENERATOR SET

A. The engine generator system shall be in accordance with NFPA, UL, NEMA and ANSI, and as specified and as shown on the drawings.

B. Provide a factory-assembled, wired, (except for the field connections), complete, fully automatic diesel engine-generator system.

C. Published Rating:

1. Shall be not less than 2000/2500 KW/KVA Prime at 7200/12,470 volts, 3-phase, 4-wire, 60 Hz and 0.80 power factor.

2. Shall be capable of operating continuously for 24 consecutive hours within any 24-hour period of operation at 110 percent of its specified rating without damage.

D. Assemble, connect and wire the equipment at the factory so that only the external connections need to be made at the construction site.

E. Unit shall be factory painted with manufacturer's primer and standard finishes.

F. Coordinate the components of the system and their arrangements, electrically and mechanically.

G. Connections between components of the system shall conform to the recommendations of the manufacturer of the diesel engine-generator set.

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H. Couplings, shafts, and other moving parts shall be enclosed and guarded.

Guards shall be metal, ruggedly constructed, rigidly fastened and readily removable for convenient servicing of the equipment without disassembling any pipes and fittings.

I. Generator set and cooling system shall be furnished with extended life antifreeze solution to protect the system from freezing at all times.

J. Generator set shall have the following features:

1. Factory-mounted on a common, rigid, welded, structural steel base.

2. The maximum engine-generator set vibration in the horizontal, vertical, and axial directions shall be limited to 0.15mm with an overall velocity limit of 24 mm/sec RMS, for all speeds.

3. The isolators shall be constrained with restraints capable of withstanding static forces in any direction equal to twice the weight of the supported equipment.

4. Automatic start, accelerate to the specified RPM and deliver the specified KW/KVA output at 60 Hz within 10 seconds after a single pole contact closes in a remote device.

5. Recover rapidly from instantaneous changes between no load and the specified KW/KVA rating, and the reverse changes of load, without damage.

6. Shall be capable of operating satisfactorily as specified for not less than 10,000 hours between major overhauls.

7. Engine-generator set shall be statically and dynamically balanced at the factory in order to comply with the maximum vibration velocity specified in paragraph 3.1.D.

2.2 DIESEL ENGINE

A. Coupled directly to a generator.

B. Minimum 4-cylinders.

C. Operating speed shall be 1800 RPM.

D. BMEP for the diesel engine, while the engine-generator set is delivering

100 percent of its specified output, shall not exceed the following maximum limits:

E. The minimum cubic inch displacement of the engine shall not be less than the value calculated from the following equation:

Displacement = BHP_x_K_ BMEP x RPM

Where BHP = Specified KW + R

0.746 x G

K = 396,000 for 2-cycle engines

K = 792,000 for 4-cycle engines

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RPM = 1800

G = generator efficiency expressed as a decimal

R = horsepower of radiator fan

R = O, when electric motor driven radiator fan is herein specified

F. The engine shall be able to start in a 4.5 degrees C (40 degrees F) ambient temperature while using No. 2 diesel fuel oil without the use of starting aids such as glow plugs and ether injections.

G. Fuel oil consumption of the engine rate shall not exceed .40 pounds of fuel oil per BHP per hour when it delivers 100 percent of its specified

KW/KVA rating.

H. Equipped with electric heaters for maintaining the engine’s coolant temperature in the range of 32-38 degrees C (90-100 degrees F) as recommended by the manufacturer.

1. Install thermostatic controls, contactors, and circuit breaker protected circuits for the heaters.

2. The heaters shall operate continuously except while the engine is operating or the water temperature is at the predetermined level.

2.3 GOVERNOR

A. Isochronous; electronic.

B. Steady-state speed band at 60 Hz shall not exceed plus or minus 1/3 of one percent.

C. At 60 Hz, when load changes equal to 25 percent of the specified KW/KVA rating, frequency change shall not exceed two percent and it shall recover to 60 Hz within three seconds.

D. At 60 Hz, when load changes equal to 100 percent of the specified KW/KVA rating, frequency change shall not exceed eight percent and it shall recover to 60 Hz within five seconds.

E. While the engine is running, manual speed adjustments may be made.

2.4 LUBRICATION OIL SYSTEM

A. Pressurized type.

B. Positive-displacement pump driven by engine crankshaft.

C. Full-flow strainer and full-flow or by-pass filters.

D. Filters shall be cleanable or replaceable type and shall remove particles as small as 3 microns without removing the additives in the oil. For by-pass filters, flow shall be diverted without flow interruption.

E. Extend lube oil sump drain line passing out through the skid base and terminate it with a drain valve and plug.

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2.5 FUEL OIL SYSTEM

A. Shall comply with NFPA 37 and NFPA 30, and have the following features:

1. Injection pump(s) and nozzles.

2. Plungers shall be carefully lapped for precision fit and shall not require any packing.

3. Filters or screens, which require cleaning or replacement, will not be permitted in the injection system assemblies.

4. Return surplus oil from the injectors to the main storage tank by gravity or a pump.

5. Filter System:

a. Dual primary filters shall be located between the main fuel oil storage and belly tank.

b. Secondary filters (engine mounted) shall be located so the oil will be thoroughly filtered before it reaches the injection system assemblies.

c. Filters shall be cleanable or replaceable type and shall entrap and remove water from oil as recommended by the engine manufacturer.

B. Belly Tank:

1. Capacity of the skid mounted belly tank shall be not less than 5000 gallons.

2. Shall be welded steel, UL approved.

3. Secure, pipe and connect the tank adequately for maximum protection from fire hazards, including oil leaks.

4. Incorporate a vent, drain cock, shutoff cocks and gauge glass.

Terminate the vent piping outdoors with mushroom vent cap. Provide three additional 2 inch ports for fuel supply and fuel return from main fuel tank and spare.

5. Incorporate a float switch on the belly tank to control the fuel oil transfer pump and to actuate an alarm in the engine generator control cubicle when the oil level in the tank drops below the level at which the transfer pump should start to refill the tank.

a. The float switch contacts, which control the fuel oil transfer pump, shall be set to energize the pump when the liquid level in the tank reaches 1/3 of the total volume of the tank.

b. The float switch contacts, which actuate the low fuel oil belly tank alarm device, shall be set to alarm and energize the second fuel transfer pump when the liquid level in the tank reaches 1/4 of the total volume of the tank.

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6. Belly tank and engine supply line elevations shall be below the elevation of the injector return outlet on the engine.

C. Fuel Oil Transfer Pump-Main Storage Tank to Belly Tank(s).

1. Electric motor-driven, duplex arrangement, close-coupled, single-stage, positive-displacement type with built-in pressure relief valves. When the fuel is used for cooling components of the fuel injection system, the engine's fuel return line shall be returned to the main storage tank, rather than the belly tank.

2. Include a heavy-duty automatic alternator and H-0-A switch to alternate sequence of pumps and allow maintenance. Pumps shall be controlled with the float switch on the belly tank and H-O-A selector switch so the belly tank will be refilled automatically when the oil level lowers to the low limit for the float switch. The H-0-A selector switches shall enable the pumps to be operated manually at any time.

3. For all engines, each transfer pump and its electrical and plumbing connections shall be sized to provide a flow rate of at least four times the engines' fuel pumping rate.

4. Provide a manually operated, rotary-type, transfer pump connected in parallel with the electric motor-driven transfer pumps so that oil can be pumped to the belly tank while the electric motor-driven pumps are inoperative.

D. Piping System: Black steel, standard weight, ASTM A-53 pipe and necessary valves and pressure gages between:

1. The engine and the belly tank as shown on the drawings.

2. The belly tank and the supply and return connections at the above ground storage tank as shown on the drawings. Connections at the engine shall be made with flexible piping suitable for the fuel furnished.

3. See fuel oil piping diagram on the drawings.

2.6 ENGINE COOLING SYSTEM

A. Liquid-cooled, closed loop, with radiator mounted on the engine generator set and integral engine driven circulating pump.

B. Cooling capacity shall not be less than the cooling requirements of the engine-generator set and its lubricating oil while operating continuously at 110 percent of its specified rating.

C. Coolant shall be extended life antifreeze solution, 50 percent ethylene and 50 percent soft water, with corrosion inhibitor additive as recommended by the manufacturer

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D. Radiator core tubes material shall be as recommended by the engine manufacturer.

E. Fan shall be driven by multiple belts from engine shaft.

F. Coolant hoses shall be flexible per manufacturer's recommendation.

G. Self-contained thermostatic-control valve shall modulate coolant flow to maintain optimum constant coolant temperature as recommended by the engine manufacturer.

h. Motor-Operated Dampers:

1. Dampers shall be two-position, electric motor-operated.

2. Dampers shall open simultaneously with the starting of the diesel engine and shall close simultaneously with the stopping of the engine.

2.7 AIR INTAKE AND EXHAUST SYSTEMS

A. Air Intake: Provide an engine-mounted air cleaner with replaceable dry filter and dirty filter indicator.

B. Exhaust System:

1. Where turbo-charges are required, they shall be engine-mounted, driven by the engine gases, securely braced against vibration and adequately lubricated by the engine's filtered lubrication system.

2. Exhaust Muffler:

a. Shall be Critical grade type and capable of the following noise attenuation:

Octave Band Hertz (Mid Frequency)

Minimum db Attenuation (.0002 Microbar Reference)

31 5

63 10

125 27

500 37

1000 31

2000 26

4000 25

8000 26

3. Pressure drop in the complete exhaust system shall be small enough for satisfactory operation of the engine-generator set while it is delivering 110 percent of its specified rating.

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4. Exhaust pipe size, from the engine to the muffler, shall be as recommended by the engine manufacturer. Pipe size from muffler to air discharge shall be two-pipe sizes larger than engine exhaust pipe.

5. Connections at the engine exhaust outlet shall be made with a flexible exhaust pipe. Provide bolted type pipe flanges welded to each end of the flexible section.

C. Condensate drain at muffler shall be made with schedule 40 black steel pipe through a petcock.

D. Exhaust Piping and Supports: Black steel pipe, ASTM A-53 standard weight with welded fittings. Spring type hangers shall support the pipe.

E. Insulation for Exhaust Pipe and Muffler:

1. Calcium silicate minimum 75 mm (3 inches) thick.

2. Insulation shall be as specified in Section 23 07 11, HVAC, PLUMBING, AND BOILER PLANT INSULATION.

3. The installed insulation shall be covered with aluminum jacket 0.4 mm

(0.016 inch) thick. The jacket is to be held in place by bands of

(0.38 mm) (0.015 inch) thick by 15 mm (0.5 inch) wide aluminum.

4. Insulation and jacket are not required on flexible exhaust sections.

F. Roof Sleeves: Pipe sleeves (thimble) shall be schedule 40 standard weight steel pipe. Flash exhaust pipe thimble through roof with 16 ounce soft sheet copper, flanged and made watertight and extended up around pipe thimble. The exhaust pipe shall be positioned within the thimble by four 150 mm (6 inch) wide spiders welded to the exhaust pipe.

2.8 ENGINE STARTING SYSTEM

A. Shall start the engine at any position of the flywheel.

B. Electric cranking motor:

1. Shall be engine-mounted.

2. Shall crank the engine via a gear drive.

3. Rating shall be adequate for cranking the cold engine at the voltage provided by the battery system, and at the required RPM during five consecutive starting attempts of 10 seconds cranking each at 10 second intervals, for a total of 50 seconds of actual cranking without damage.

C. Batteries: 12 volt electric with the following features:

1. Batteries shall be nickel-cadmium high discharge rate type.

2. Each battery cell shall have minimum and maximum electrolyte level indicators, and flip top flame arrestor vent cap.

3. Batteries shall have connector covers for protection against external short circuits.

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4. With the charger disconnected, the batteries shall have sufficient capacity so that the total system voltage does not fall below 85 percent of the nominal system voltage with the following demands:

a. Five consecutive starting attempts of 10 seconds cranking at 10 second intervals for a total of 50 seconds of actual cranking

(the fifth starting attempt will be manually initiated upon failure of a complete engine cranking cycle).

5. Battery racks shall be metal with an alkali resistant finish and thermal insulation, and secured to the floor.

6. Battery shall operate continuously for 12 hours and be able to provide the cranking power described in 2.8.B.3 without charging.

D. Battery Charger:

1. The charger shall maintain one percent voltage regulation from no load to full load for line voltage variation of 10 percent and frequency variation of ± 3 Hz from 60 Hz.

2. The charger shall maintain a nominal float voltage of 1.4 vdc and a nominal equalizing voltage of 1.6 vdc.

3. The charger shall be capable of continuous operation in an ambient temperature of –20 to 60 degrees C (-30 to 104 degrees F) without derating. The charger shall be convection cooled and housed in a NEMA

250, Type 1 enclosure. The charger shall have a hinged front door and all components shall be accessible from the front.

4. Provide both AC and DC transient protection. Charger shall be able to recharge a fully discharged battery without tripping AC protective devices. AC circuit breaker shall not trip under any DC load condition including short circuit on output terminals.

5. The charger shall be capable of recharging the fully discharged battery in 12 hours and simultaneously power the Supervisory and

Control panel.

6. The charger shall have fused AC input and DC output protection, and shall not discharge the batteries when AC power fails.

7. The charger shall have the following accessories:

a. On-Off control switch with pilot light.

b. Hand adjustable 0 to 24 hour equalize charge timer.

c. AC power failure alarm light.

d. High DC voltage alarm light.

e. DC voltmeter – 5 percent accuracy.

f. DC Ammeter – 5 percent accuracy.

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2.9 GENERATOR

A. Synchronous, amortisseur windings, bracket-bearing, self-venting, rotating-field type connected directly to the engine.

B. Lifting lugs designed for convenient connection to and removal from the engine at the construction site.

C. Integral poles and spider, or individual poles dove-tailed to the spider.

D. Insulation shall be as required for the ambient temperature and other requirements designated in the paragraph, DIESEL ENGINE-GENERATOR SET, in this section.

E. Designed for sustained short circuit currents in conformance with NEMA

Standards.

F. Designed for sustained operation at 125 percent of the RPM specified for the generator set without damage.

G. Telephone influence factor shall conform to NEMA Standards.

H. Furnished with brushless excitation system or static-exciter-regulator assembly.

I. Nameplates attached to the generator and exciter shall show the manufacturer's name, equipment identification, serial number, voltage ratings, field current ratings, KW/KVA output ratings, power factor rating, time rating, temperature rise ratings, RPM ratings, full load current rating, number of phases and frequency, and date of manufacture.

J. At full load, the efficiency shall be not less than:

1. 89 percent for sets specified from 60 KW to 175 KW.

2. 92 percent for sets specified over 175 KW.

K. The neutral shall be electrically isolated from equipment ground and terminated in same junction box as the phase conductors.

2.10 EQUIPMENT FOR CONTROLS, SUPERVISION AND DISTRIBUTION

A. Shall include Engine Generator Control Cubicle(s), Master Control

Cubicle, Remote Derangement Panel.

1. Control Equipment shall be in accordance with UL 508, NEMA ICS-4, ICS-6 and ANSI C37.90.1.

2. Panels shall be in accordance with UL 50.

3. Cubicles shall be in accordance with UL 891.

4. Incorporate all of the items required to fulfill the requirements in the specifications and on the drawings.

5. Components:

a. Shall be heavy duty, industrial type.

b. Electrical contacts shall be precious metal surfaced.

c. Only heavy duty solid-state components will be accepted.

001-10017-006 26 32 14 - 16

6. Coordinate controls with the Mississippi Power Company remote load shedding exercising operations.

7. Cubicles and Panels:

a. Code gauge steel; manufacturer's recommended heavy gauge steel with factory primer and light gray finish.

b. Doors shall be gasketed and be attached with concealed or semi-concealed hinges, and shall have a permanent means of latching in closed position.

c. Panels shall be wall mounted or incorporated in other equipment as indicated on the drawings or as specified.

d. Cubicle design shall be of frame construction free standing sheet metal cabinet, floor supported with front and rear access openings for air circulation.

e. Door locks for panels and cubicles shall have identical keying to operate from a single key.

f. Panel installation shall be suitable for convenient maintenance and operation. Overall heights of the cubicles shall not exceed

2.5 meters (90 inches).

8. Wiring: Insulated, rated at 600 volts, UL approved.

a. Install the wiring in vertical and horizontal runs, neatly harnessed.

b. Terminate all external wiring at heavy duty, pressure type, terminal blocks.

9. Clearly and permanently label the equipment, wiring terminals and wires.

10. Laminate or mount under plexiglas appropriate wiring diagrams and mount them within the frame on the inside of the cubicles and panels.

11. The system shall be designed and manufactured employing the most modern technology to insure maximum reliability and longevity. It shall be arranged for automatic and manual starting, and stopping, and paralleling of up to 6 diesel generator sets.

12. See Medium Voltage Paralleling Switchgear, Section 201400.

13. All indicating lamps and switches shall be accessible and mounted on the cubicle doors.

14. Electronic governor control panel, voltage regulator, control panel, motorized voltage adjusting potentiometer, and associated components shall be shipped to the paralleling switchboard manufacturer for assembly, mounting and/or interwiring in the switchboard. Detailed drawings outlining proper interconnection and physical mounting data shall also be furnished to the paralleling switchboard manufacturer

001-10017-006 26 32 14 - 17 to facilitate proper design and interfacing. The engine generator set supplier shall furnish these items as soon as possible.

15. All meters shall be solid-state switchboard type, 112 mm (4-1/2 inches), 1 percent accuracy transformer rated for 600 volt service.

Ammeters and voltmeters shall be furnished with phase selector switches. Metering shall include necessary current and potential transformers and instrument fuses.

16. The repetitive accuracy of the monitors shall be as stated over an environmental temperature range of 0 to 45 degrees C (32 to 113 degrees F) and voltage range of 70 to 110 percent of nominal. The accuracy shall not exceed the following limits:

Voltage Monitors + 2 percent of set point

Current Monitors + 3 percent of set point

Frequency Monitors + 0.2 Hz.

Power Monitors + 3 percent of set point

17. The manufacturer shall coordinate the interfacing of the control systems with all related equipment supplied in accordance with other sections of the project specification.

B. Engine Generator Control Cubicle

1. Starting and Stopping Controls:

a. A three-position, maintained-contact type selector switch with positions marked "AUTOMATIC", "OFF" and "MANUAL". Provide flashing amber light for "OFF" and "MANUAL" positions.

b. A momentary contact pushbutton switch with positions marked

"MANUAL START" and "MANUAL STOP".

c. Selector switch in "AUTOMATIC" position shall cause the engine to start automatically when a single pole contact in a remote device closes. When the generator's output voltage increases to not less than 90 percent of its rated voltage, and its frequency increases to not less than 58 Hz, the remote devices shall transfer the load to the generator. An adjustable time delay relay, 0 to 15 minute range, shall cause the engine generator set to continue operating without any load after completion of the period of operation with load. Upon completion of the additional 0 to 15 minute

(adjustable) period, the engine generator set shall stop.

d. Selector switch in "OFF" position shall prevent the engine from starting either automatically or manually. Selector switch in

001-10017-006 26 32 14 - 18

"MANUAL" position shall cause the engine to start when the manual start pushbutton is also depressed momentarily.

e. With selector switch in "MANUAL" position, depressing the "MANUAL

STOP" pushbutton momentarily shall stop the engine after a cool down period.

f. A maintained contact, red mushroom head pushbutton switch marked

"EMERGENCY STOP" will cause the engine to stop without a cool down period independent of the position of the selector switch.

2. Engine Cranking Controls:

a. The cranking cycles shall be controlled by timer that will be independent of the battery voltage fluctuations.

b. Shall crank the engine through one complete cranking cycle, consisting of four starting attempts of 10 seconds each and 10 seconds between each attempt.

c. Total actual cranking time for the complete cranking cycle shall be 40 seconds during a 70 second interval.

d. Cranking shall terminate when the engine starts so the starting system will not be damaged. Termination of the cranking shall be controlled by self-contained, speed-sensitive switch. The switch shall prevent re-cranking of the engine until after the engine stops.

e. After the engine has stopped the cranking control shall reset.

3. Supervisory Controls:

a. Overcrank:

1) When the cranking control system completes one cranking cycle, four starting attempts, without starting the engine, the

"OVERCRANK" signal light and the audible alarm shall be energized.

2) The cranking control system shall lock-out, and shall require a manual reset.

b. Coolant Temperature:

1) When the temperature rises to the predetermined first stage level, the "HIGH COOLANT TEMPERATURE - FIRST STAGE" signal light and the audible alarm shall be energized.

2) When the temperature rises to the predetermined second stage level, which shall be low enough to prevent any damage to the engine and high enough to avoid unnecessary engine shutdowns, the "HIGH COOLANT TEMPERATURE - SECOND STAGE" signal light and the audible alarm shall be energized and the engine shall stop.

001-10017-006 26 32 14 - 19

3) Difference between the first and second stage temperature settings shall be approximately -12 degrees C (10 degrees F).

4) Permanently indicate the temperature settings near the associated signal light.

5) When the coolant temperature drops to below 21 degrees C (70 degrees F), the "LOW COOLANT TEMPERATURE" signal light and the audible alarm shall be energized.

c. Low Coolant Level: When the coolant level falls below the minimum level recommended by the manufacturer, the "LOW COOLANT LEVEL" signal light and audible alarm shall be energized.

d. Lubricating Oil Pressure:

1) When the pressure falls to the predetermined first stage level, the "OIL PRESSURE - FIRST STAGE" signal light and the audible alarm shall be energized.

2) When the pressure falls to the predetermined second stage level, which shall be high enough to prevent damage to the engine and low enough to avoid unnecessary engine shutdowns, the "OIL PRESSURE - SECOND STAGE" signal light and the audible alarm shall be energized and the engine shall stop.

3) Difference between the first and second stage pressure settings shall be approximately 15 percent of the oil pressure.

4) Permanently indicate the pressure settings near the associated signal light.

e. Overspeed:

1) When the engine RPM exceeds the maximum RPM recommended by the manufacturer of the engine, the engine shall stop.

2) Simultaneously, the "OVERSPEED" signal light and the audible alarm shall be energized.

f. Low Fuel - Belly Tank:

1) When the fuel oil level in the belly tank decreases to less than the level at which the fuel oil transfer pump should start to refill the tank, the "LOW FUEL BELLY TANK" light and the audible alarm shall be energized.

g. Low Fuel - Main Storage Tank:

1) When the fuel oil level in the storage tank decreases to less than 1/3 of total tank capacity, the "LOW FUEL-MAIN STORAGE

TANK” signal light and audible alarm shall be energized.

h. Reset Alarms and Signals: Overcrank, Coolant Temperature, Coolant

Level, Oil Pressure, Overspeed, and Low Fuel signal lights and the associated audible alarms shall require manual reset. A

001-10017-006 26 32 14 - 20 momentary-contact silencing switch and pushbutton shall silence the audible alarm by using relays of solid state devices to seal-in the audible alarm in the de-energized condition

Elimination of the alarm condition shall automatically release the sealed-in circuit for the audible so that it will be automatically energized again when the next alarm condition occurs. The signal lights shall require manual reset after elimination of the condition, which caused them to be energized. Install the audible alarm in the paralleling switchgear building as directed by the

Resident Engineer. The audible alarm shall be rated for 85 dB at 3 meter (10 feet).

i. Generator Breaker Signal Light:

1) Molded case circuit breaker and contactor: A flashing green light shall be energized when the generator circuit breaker is in either the "OPEN" or "TRIPPED" position.

2) Power circuit breaker: A flashing green light shall be energized when the generator circuit breaker is in the "OPEN" or "TRIPPED" position.

3) Simultaneously, the audible alarm shall be energized.

4. Monitoring Devices:

a. Electric type gauges for the cooling water temperatures and lubricating oil pressures. These gauges may be engine mounted with proper vibration isolation.

b. A running time indicator, totalizing not less than a 9,999 hour, heavy duty and an electric type tachometer.

c. Voltmeter, ammeter, and their selector switches, frequency meter, kilowatt meter, manual adjusting knob for the output voltage and the other items shown on the drawings shall be mounted on the front of the generator control panels.

d. Install potential and current transformers as required.

e. Individual signal lights:

1) OVER-CRANK

2) HIGH COOLANT TEMPERATURE - FIRST STAGE

3) HIGH COOLANT TEMPERATURE - SECOND STAGE

4) LOW COOLANT TEMPERATURE

5) OIL PRESSURE - FIRST STAGE

6) OIL PRESSURE - SECOND STAGE

7) LOW COOLANT LEVEL

8) GENERATOR BREAKER

9) OVERSPEED

001-10017-006 26 32 14 - 21

10) LOW FUEL - BELLY TANK

11) LOW FUEL – MAIN STORAGE TANK

f. Lamp Test: "Lamp Test" momentary contact switch shall momentarily actuate the alarm buzzer and all the indicating lamps.

5. Power switching and overcurrent protection shall be accomplished with power circuit breakers .

a. Power Circuit Breakers shall have the following features:

1) Shall be low voltage, airbreak, AC power type, dead front, 100 percent rated, stored energy, with solid-state trip devices.

Arcing contacts shall be renewable.

6. Automatic Voltage Regulator:

a. Shall maintain the generator's output voltage within plus or minus one percent for load variations between no load and full load.

b. Shall correct voltage fluctuations rapidly and restore the output voltage to the predetermined level with a minimum amount of hunting.

c. Shall include voltage level rheostat located inside the control cubicle.

7. Governor: Specified herein before in Article 2.3 "GOVERNOR".

8. The voltage regulator and other components of the auxiliary electrical power system shall be protected during operation of the diesel engine-generator set at speeds other than the rated RPM while performing maintenance by a power monitoring system which monitors single phase and three phase faults. A time-delay relay shall shut down the engine when the alternator thermal capacity is exceeded.

9. Reverse Power Monitors: Solid-state reverse power monitors shall be furnished to sense motorizing of a failing engine-generator set. Upon detection of a reverse power flow, the monitor shall signal the alarm circuit for immediate power disconnect of the generator and actuation of load dumping circuits, and energize the audible and visual alarm signals. Monitors shall automatically reset open generator disconnect from the bus. An induction disc type reverse power relay with equivalent performance may be submitted for approval. The monitor shall have the following features:

a. Accurate operation at power factors down to 0.2 lagging or leading.

b. Minimum 10 amperes output contacts rated at 480 volts.

c. Circuitry arranged to continually sense the output power of the generator for magnitude and direction.

001-10017-006 26 32 14 - 22

d. Operate accurately over voltage range of 70 percent to 110 percent of rated voltage.

e. Adjustable dial for trip power range.

f. Test switch to simulate reverse power for periodic testing. Switch shall be arranged to cause sensing circuitry to measure a reverse power.

10. Synchronizing Monitors: A solid-state generator-synchronizing monitor shall sense voltage, frequency and phase angle of the unit to be paralleled. The monitor shall compare the voltage of the bus with that of the unit to be paralleled and initiate corrective action to cause the voltage difference to be reduced to less than 5 percent of nominal. Voltage adjustment shall be achieved by a motorized voltage adjusting potentiometer, as furnished by generator set manufacturer.

The monitor shall compare the frequency of the bus with that of the unit to be paralleled, and shall control the governor to cause the frequency of the unit to be paralleled to match within 0.2 Hz. The monitor shall also compare the phase angle of the bus with that of the unit to be paralleled and reduce the phase angle of the unit to be paralleled to a maximum of five electrical degrees at the instant the connection is made to the bus. Upon achievement of the appropriate phase angle the generator circuit breaker shall close to parallel the unit. The monitor shall be mounted remotely in the control cabinet. Solid-state circuitry shall be used for all sensing and control functions. Interface circuits for control of voltage adjustment and circuit breaker closing shall be through enclosed electromagnetic relays.

2.11 MASTER CONTROL CUBICLE

A. Shall contain all system-totalizing controls for the integrated system operation as specified below:

1. Bus Metering:

a. AC ammeter.

b. AC voltmeter.

c. Frequency meter 55-65 Hz Scale.

d. Watt/Var meter.

e. Ammeter/Voltmeter phase selector switches with current and potential transformers and proper fuses.

2. Synchroscope:

a. Furnish with a selector switch and manual means of paralleling engine generator sets for override of the automatic system.

001-10017-006 26 32 14 - 23

b. Furnish with a synchronizing phase band limiter to sense and compare the phase angle difference in the generators, which are to be manually paralleled, and lock out the manual paralleling button within 15 degrees (electrical) of synchronism.

3. A load demand monitor shall sense the load connected to the bus, and establish the proper number of generator sets to operate and maintain the connected load with a minimum on-line reserve generating capacity of 10 percent of the rating of a single generator set. The load monitor shall also disconnect a generator from the bus whenever the on-line reserve capacity exceeds 110 percent of a single generator set. The load demand monitor shall be adjustable to initiate the addition and removal of a generator set from the main bus. The monitor shall be unit chassis construction utilizing state-of-the-art solid-state circuitry and shall include built-in time delays. The load monitor shall sense the bus kilowatts (kW), real load without the use of thermal transducers, meter relays, and like items. The load monitor shall be designed to maximize fuel economy while maintaining sufficient capacity to sustain the load.

4. The emergency bus shall have a frequency monitor with integral time delay to initiate load dumping upon a reduction of the bus frequency to 58 Hz or less for a period of two seconds or more. Upon sensing a bus under frequency, the system shall automatically shed the lowest priority load connected at the time of the occurrence. This shed circuit shall override any manual load add activity and lock out the manual load add circuitry. Visual and audible alarms shall be energized upon sensing of bus under frequency load dump.

5. Control power for the system logic shall be derived from the engine starting batteries. The control logic shall be powered through a suitable means, which shall permit continuity of power until the last battery is no longer available. The controls shall be powered from any battery or combination of batteries as is necessary with positive isolation of batteries to prevent feedback to a failing battery. The transition of control logic power from any battery combination to any other battery combination shall be without discontinuities in the power flow.

6. Individual visual signals plus common audible alarm and silencing circuitry shall be provided to monitor the following conditions:

a. Low Fuel Level Main Underground Storage Tank shall be energized when the fuel oil level decreases to less than 1/3 of total capacity.

001-10017-006 26 32 14 - 24

b. Under frequency failure.

c. Controls not in automatic mode.

d. Load shed circuit activation.

7. A "Lamp Test" momentary contact switch shall momentarily actuate the alarm buzzer and all the indicating lamps.

8. Manual/Automatic Mode Control Switch.

9. Remote Transfer Switch Interfacings:

a. For each transfer switch, incorporate red and green lamps, indicating the position of the transfer switch.

b. For each transfer switch, incorporate a two position contact switch. Label switch positions, "Test" and "Automatic". The "TEST" position shall simulate an outage of normal power at the transfer switch. The "Automatic" position shall place the transfer switch in normal operation.

2.12 PARALLELING OPERATION

A. Emergency Mode:

1. Upon initiation of the automatic sequence, all engine generator sets shall start. The first engine generator set to achieve 90 percent of nominal voltage and frequency shall be connected to the emergency bus. As the remaining engine generator sets start, their respective synchronizers shall initiate control of voltage and frequency of the oncoming set with the bus. Upon achieving synchronism with the bus, the oncoming set shall be paralleled on the bus. After all generators are connected to bus all emergency loads are connected to the bus.

Circuitry shall prevent the automatic transfer of emergency load to the emergency bus until there is sufficient capacity to carry these loads. Provision shall be made to manually override the load addition circuits for supervised operation.

2. Load demand sensing shall be furnished to insure that sufficient generating capacity is connected to the bus to carry the load. In addition, it shall insure that not more than the required capacity plus a limited reserve is connected to the bus at any time. The system in conjunction with the load demand shall insure maximum efficiency in the utilization of generator sets to insure maximum fuel economy.

3. Load demand sensing shall insure that the on-line reserve capacity does not exceed less than 10 percent or more than 110 percent of a single generator set. Upon sensing if the connected load exceeds the present limit for an established period of time, the next generator set will be started and paralleled. And if upon sensing the connected

001-10017-006 26 32 14 - 25 load is less than the preset limit for an established period of time, the last generator set to be paralleled will be disconnected and shutdown. Its controls will be automatically reset so that the generator set will be ready for next operation.

4. While one generator set is connected to the bus, and if the connected load exceeds the capacity of the bus resulting in a decrease in…