26 23 13 - GENERATOR PARALLELING CONTROLS.pdf

CONSTRUCT CENTRAL EMERGENCY POWER DISTRIBUTION – DESIGN 512A5-18-302

VAMC MARYLAND

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SECTION 26 23 13

GENERATOR PARALLELING CONTROLS

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies the furnishing, installation, connection, and testing of indoor control components for medium-voltage paralleling

Standby Electrical System generators.

B. The generator paralleling controls shall be compatible and functional with the switchgear, engine generators, automatic transfer switches, load bank, remote annunciators, and all related components.

C. The system shall be equipped to parallel five (5) engine generator sets, (4) new and (1) future, with (2) utilities in a closed transition softload operation.

D. The system shall be comprised of (20) sections: (1) master control section, (5) generator sections, (2) utility circuit breaker sections,

(2) utility metering sections, (1) tie circuit breaker section, (1) load bank circuit breaker section and (8) distribution sections.

E. Manufacturer bidders must meet the following minimum requirements for acceptability:

1. Manufacturer must have at least (30) years of experience in manufacturing and servicing generator control switchgear.

2. Manufacturer must have field service representatives shall be on call and available for immediate dispatch 24 hours a day, 365 days a year. All field service personnel shall be factory trained, by the manufacturer, and certified in the maintenance and repair of the specified equipment. Manufacturer must employ a minimum of 2 field service technicians within a 100 mile radius of the installation site. Field service representatives shall have access to common replacement components locally and the service organization shall have a detailed counter-to-counter process for providing emergency spares 24 hours a day 7 days a week.

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3 Manufacturer must maintain a global service and support phone number with a mean time of response from a certified technician of less than

10 minutes.

1.2 RELATED WORK

A. Section 25 10 10, ADVANCED UTILITY METERING: Electrical metering.

B. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS:

Requirements that apply to all sections of Division 26.

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

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

D. Section 26 05 73, OVERCURRENT PROTECTIVE DEVICE COORDINATION STUDY:

Short circuit and coordination study, and requirements for a coordinated electrical system.

E. Section 26 13 13, MEDIUM-VOLTAGE CIRCUIT BREAKER SWITCHGEAR: Medium-voltage enclosures, busing, and circuit breakers for generator paralleling switchgear.

F. Section 26 32 13, ENGINE GENERATORS: Engine generators.

1.3 QUALITY ASSURANCE

A. Quality Assurance shall be in accordance with Paragraph, QUALIFICATIONS

(PRODUCTS AND SERVICES) in Section 26 05 11, REQUIREMENTS FOR

ELECTRICAL INSTALLATIONS.

1.4 FACTORY TESTS

A. Factory Tests shall be required.

B. Factory Tests shall be in accordance with Paragraph, MANUFACTURED

PRODUCTS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL

INSTALLATIONS, and the following requirement:

1. Generator paralleling controls shall be tested to assure that there are no electrical or mechanical defects. Tests shall be conducted in accordance with UL and ANSI standards.

C. The Government shall have the option to witness the factory tests. The

Government shall pay for all expenses of the Government

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Representative's trips to witness the testing. Notify the COR not fewer than 30 days prior to factory tests.

1.5 SUBMITTALS

A. Submit in accordance with Paragraph, SUBMITTALS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, and the following requirements:

1. Shop Drawings:

a. Per the requirements of //Section Section 26 13 13, MEDIUM-

VOLTAGE CIRCUIT BREAKER SWITCHGEAR// //Section 26 23 00, LOW-

VOLTAGE SWITCHGEAR//.

b. Include sequences of operation and interconnecting controls diagrams, showing connections to switchgear, generators, automatic transfer switches, and remote annunciators.

c. The manufacturer shall provide a simulation of the operation of the switchgear for review by the engineer and owner during submittal review. Additionally, a digital recording of this simulation will be provided as part of the Operation &

Maintenance manual provided upon project completion.

d. Certification from the manufacturer that representative generator paralleling controls have been seismically tested to

International Building Code requirements. Controls must be located within the paralleling switchgear and not mounted at the generator. Certification shall be based upon simulated seismic forces on a shake table or by analytical methods, but not by experience data or other methods.

2. Manuals:

a. When submitting the shop drawings, submit companion copies of complete maintenance and operating manuals, including technical data sheets, wiring diagrams, and information for ordering replacement parts.

1) The terminals of wiring diagrams shall be identified to facilitate installation, maintenance, and operation.

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2) Wiring diagrams shall indicate internal wiring for each piece of equipment and the interconnection between the pieces of equipment, including related equipment specified in other sections.

3) Provide a clear and concise description of operation, including detailed information required to properly operate the equipment.

4) Approvals shall be based on complete submissions of manuals together with shop drawings.

b. If changes have been made to the maintenance and operating manuals originally submitted, submit updated maintenance and operating manuals two weeks prior to the final inspection.

3. Factory Witness Test

a. The factory witness testing will include two individual tests, a simulation test and a factory witness test. The system simulation testing will include witness testing of the master program in a simulated environment to review and confirm the sequence of operations and may be provided either at the factory or via webcast at the owner’s request. This test will be performed 4 weeks prior to the factory witness test. The factory witness test will include a mechanical inspection of the switchgear and full sequence of operation testing of the switchgear with simulated utility and generator sources.

3. Test Reports:

a. Two weeks prior to the final inspection, submit certified field test reports and data sheets.

4. Certifications: Two weeks prior to the final inspection, submit the following.

a. Certification by the manufacturer that the generator paralleling controls conform to the requirements of the drawings and specifications.

b. Certification by the Contractor that the generator paralleling controls have been properly installed, connected, and tested.

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1.6 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 the basic designation only.

B. International Code Council (ICC):

IBC-15..................International Building Code

C. National Fire Protection Association (NFPA):

70-17...................National Electrical Code (NEC)

99-15...................Health Care Facilities

110-16..................Emergency and Standby Power Systems

D. National Electrical Manufacturers Association (NEMA):

250-14..................Enclosures for Electrical Equipment (1000 Volts

Maximum)

ICS 6-11................Enclosures

E. Underwriters Laboratories Inc. (UL):

50-15...................Enclosures for Electrical Equipment

508A-13.................Industrial Control Panels

1.7 WARRANTY

A. Manufacturer shall warrant the equipment for eighteen months from date of shipment subject to terms and conditions of manufacturer’s current warranty publication.

B. Manufacturer shall have an established network of factory-direct service technicians capable of servicing the equipment.

C. Post-warranty service contracts shall be made available to the owner by the manufacturer to provide scheduled maintenance and/or emergency repair of the equipment.

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PART 2 – PRODUCTS

2.1 GENERATOR PARALLELING CONTROLS

A. Generator paralleling controls shall be integral to the switchgear. The functional requirements are identical for all system topologies.

B. The generator paralleling controls shall perform automatic and manual operation, synchronization, load management, monitoring, and alarm annunciation functions of the paralleled engine generator system. All manual paralleling interface controls and metering shall be grouped in a central location on the front of the master control section. This shall allow for multiple generators paralleling from one location within the switchgear. Manual paralleling controls and sync check relay shall be hardwired and shall not rely on touch screens or programmable controllers to perform manual paralleling functions.

Designs which do not include hard wired manual paralleling will not be accepted.

C. A monitoring system is required to show a dynamic one-line of the paralleling gear.

1. Test reports should be automatically generated each time a test or emergency occurs. Reports shall comply with required regulatory emergency power testing standards including NFPA 110, CALEA, NFPA

99, DVL GL, The Joint Commission EC 7.40 and CMS.

2. This monitoring system must be capable of being upgraded in the future to include a dynamic play back feature that shows a visual representation of past events.

3. Increase cybersecurity by (1) encrypting generator and transfer control and monitored signals between PCS and ATS using AES 128-bit encryption, (2) Utilize the IT digital certificate to encrypt all

HTTPS data, and (3) support Active Directory (LDAP) for user authentication management, and (4) offering 4-levels of user privileges including administration, supervisor, control and monitoring.

4. Aggregated analog trend, alarm log and sequence of events data shall be downloadable in an Excel file format.

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5. The gateway device shall automatically synchronize the time clocks of power control system devices including transfer switches, power quality meters, circuit breakers, protective relays, active surge monitors and generators.

6. Alarms and alert notifications shall be user-configurable and instantly sent individually or combined into a single periodic email alert.

7. Provide a central repository to upload and view facility drawings, equipment user manuals, and other reference material.

8. Automated performance reports include energy-usage, alarm, control activity, settings and event log reports. Reports generation can be automated and scheduled once a week or month and emailed to users.

D. Each generator shall be provided with a dedicated generator control section and control set located in the switchgear that shall include a generator controller and synchronizer. PLC shall me Modicon M340. The synchronizers shall be Woodward DSLC-2 and be connected via Redundant

LANs for load-sharing and var-sharing and shall provide voltage and speed matching of the generators; in the event of a network failure, proper load-sharing and var-sharing shall not be interrupted.

Additionally, each generator shall be provided with a Generator Control

Switch located at its respective generator section to allow user control of the following modes or operation, Automatic-Test Offline-

Test Online-Off/Reset-Cooldown, and a Synchronizing Mode Selector

Switch to allow user control of the synchronizer for the following modes of operation, Permissive-Check-Off-Run.

E. DC-to-DC converter(s) shall be in each generator control section to provide a constant 24VDC power. The generator section DC-to-DC converter shall supplement the DC-to-DC converter in the master control section. Control power shall be sourced from generator set batteries and sustain adequate control voltage during an engine crank. The converters shall provide power for up to 75% rated load if the source voltage drops to 12 volts. Source voltage shall not exceed 32 volts.

F. Each generator control section shall be provided with the following LED status. This shall be provided via 1”x1” LEDs external of the operator interface panel.

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1. Low Oil Pressure (Pre-alarm)

2. Low Oil Pressure (Shutdown)

3. High Water Temperature (Pre-alarm)

4. High Water Temperature (Shutdown)

5. Overcrank (Shutdown)

6. Overspeed (Shutdown)

7. Reverse Power (Shutdown)

8. Circuit Breaker Trip

9. Generator Output Circuit Breaker Open

10. DC Control Voltage Failure

11. PLC Stopped

12. Circuit Breaker Close Failure

13. Fail to Synchronize

14. Controls not in Auto

15. Protective Relay Failure

16. Circuit Breaker Open

17. Circuit Breaker Closed

18. Circuit Breaker Withdrawn

19. Auto Start

G. Hard-wired back-up circuits shall be included such that a failure of the generator controller shall not inhibit automatic connection of the generator nor shall it remove the generator from the bus if already connected.

H. The Master Control and Monitoring Panel shall provide the following features and characteristics:

1. The 24” color touch screen OIP shall have at a minimum a resolution of 1920 x 1080, supporting 32768 different colors. The operator

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26 23 13 - 9 interface panel shall be a fanless design utilizing solid state hard drives and shall be equipped with software necessary to interface with components provided by the switchgear manufacturer and 3rd party systems (i.e. power monitoring system, building automation system).

2. The Master Control and Monitoring Panel shall accommodate flash memory that is readily available in most electronic stores. The

Master Control and Monitoring Panel shall have the capability of reading, and updating the program from the Compact Flash Card.

3. The master PLC and generator synchronizers shall provide the following control functions for each generator.

a. Automatic, manual, start, stop.

4. The master PLC shall provide the following system control functions.

a. Automatic, manual, exercise, test with load, and test without load operation.

b. Load management functions that monitor bus loads and automatically or manually control generators to meet system requirements, including prioritization of Essential and Normal

Electrical System loads and groups of loads as shown on the drawings, and operation under failure conditions of one or more engine generators.

c. Password-protected means to alter the system programming.

5. The master control and display panel shall provide the following display functions.

a. Dynamically updated and color-coded (according to status) one-line representing power flow and sources, and emergency power system elements such as engine-generator sets, circuit breakers included in scope of delivery (including breaker position and alarms), switchgear assemblies, and transfer switches (including transfer switch position, source availability, and bypass position if available).

b. Transfer Switch drill down screens shall include details of selected transfer switches, if available, including present

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26 23 13 - 10 status and position, source availability, transfer/retransfer controls (password protected).

c. A network status diagram shall be provided to display connection status to PLCs, I/O, synchronizers, meters and other system devices. The heartbeat of each device shall be annunciated for communication status: green=communicating and red=communication loss.

6. The display panel shall provide the following alarm functions.

a. All alarms annunciated by each engine generator.

b. All system alarms.

I. The master control and display panel shall be powered by at least two sources, which may be from engine generator start batteries and/or switchgear station batteries.

J. The master control section shall contain synchronous redundant programmable logic controllers. PLCs shall be Modicon M580. The PLCs shall be capable of storing necessary control sequence algorithms, variable operation set-points, time delays and alarming levels.

Redundant Distributed I/O stations shall include modular input and output cards for discrete and analog signals necessary to provide the integrated system operations. The redundant PLCs shall communicate with the Redundant I/O via LANs in a ring network for redundancy.

Systems without this redundancy shall not be accepted.

K. Master controls applications shall include Load Bus Optimization and

Generator Load Demand. Applications shall dynamically adjust to accommodate a segmented main bus or a single main bus as tie breakers open or close.

L. Provide a system no-load test switch to initiate a complete automatic system operation by simulating the closure of the remote engine start signal. This switch shall be mounted inside the master section to limit access to authorized personnel only.

M. The following hard-wired physical switches and pushbuttons shall be provided at the Master Control Station. Additionally, these shall be

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26 23 13 - 11 also provided both as part of the operator interface panel at the

Master Control.

1. System Control Selector Switch (Auto-Manual): In the automatic mode, the system will automatically respond to utility source loss. In the manual mode, the system will not respond to utility source loss.

2. Retransfer to Normal Selector Switch (Auto-Manual): In the automatic mode, the system will automatically return the system to normal upon expiration of the retransfer to normal time delay (adjustable 1-120 minutes). In the manual mode, the user can return the system to normal upon utility source acceptance.

3. Transition Mode Selector Switch (Open-Closed): In the Open mode, all transfers will occur via open transition. In the Closed mode, all transfers will occur via closed transition softload.

4. Building Load Test (MV Bus B-Off-MV Bus A+B): In the Off position, the system will retransfer the system to utility (if a test is being performed). In the MV Bus B position, the system will transfer the

MV Bus B to the generator bus. In the MV Bus A+B position, the system will retransfer both MV Bus A and MV Bus B to the generator bus.

5. Transfer Initiate Pushbutton (Lighted): This pushbutton shall allow the operator to initiate an automated sequence upon illumination of the pushbutton. Additionally, the pushbutton light shall pulse during sequence initiation.

6. Bus Mode Selection (Split-Common): In the ‘Split’ position, the system will operate with the tie circuit breaker open and both utility circuit breakers closed. In the ‘Common’ position, the system will operate with the tie circuit breaker closed and only (1) utility circuit breaker closed.

7. Preferred Utility Source (Utility A-Utility B): In the ‘Utility ‘A’ position, the system will operate common bus mode with the utility A source connected. In the ‘Utility ‘B’ position, the system will operate common bus mode with the utility B source connected.

8. Preferred Backup Source (Utility-Generator): In the ‘Utility’ position, a single source utility B outage will result in a transfer

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26 23 13 - 12 to the alternate source via the tie circuit breaker. In the

‘Generator’ position, a single source utility B outage will resut in a transfer to generator source.

9. Alarm Silence Pushbutton: This pushbutton shall allow the user to silence the alarm.

10. Bus Alarm Reset: This pushbutton shall allow the user to acknowledge active system alarms.

N. Provide a main audible alarm. The alarm horn shall be the DC vibration type, subsequent malfunctions to resound the alarm if the horn had been previously silenced.

O. The master control section shall be provided with the following LED status. This shall be provided via 1”x1” LEDs external of the operator interface panel.

1. Manual Paralleling Available

2. Bus Underfrequency Alarm

3. Load Shed Circuits Activated (One for Each Priority)

4. Load Shed Bypass (One for Each Priority)

5. Engine Generator Status Lights (One for Each Generator): Running, Online, Lockout

6. Primary System PLC Stopped

7. Secondary System PLC Stopped

8. PLC Power Source Failure

9. Emergency Mode

10. Load Demand Active

11. Bus Optimization Active

12. Bus Loaded to Capacity

13. Next Load to Exceed Headroom

14. 52UA Utility Main Circuit Breaker Open

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15. 52UA Utility Main Circuit Breaker Closed

16. 52UA Utility Main Circuit Breaker Tripped

17. 52UB Utility Main Circuit Breaker Open

18. 52UB Utility Main Circuit Breaker Closed

19. 52UB Utility Main Circuit Breaker Tripped

20. 52T Bus Tie Circuit Breaker Open

21. 52T Bus Tie Circuit Breaker Closed

22. 52T Bus Tie Circuit Breaker Tripped

23. Open Transition Active

24. Closed Transition Active

25. Building Load Test Active

26. System Not In Auto

27. System in Common Bus Mode

28. System in Split Bus Mode

29. Utility A Preferred

30. Utility B Preferred

31. Utility Preferred Backup

32. Generator Preferred Backup

P. The utility main circuit breaker shall be provided with a multifunction relay to allow utility source monitoring, reverse power protection and directional overcurrent. Additional protective relaying for closed transition operations shall be provided per Utility standards. It is the responsibility of the owner to provide these standards to the manufacturer and coordinate with the utility.

Q. The utility main circuit breakers and each tie circuit breaker shall be equipped with a synchronizer (shall be Woodward MSLC-2) to allow closed transition transfers between independent bus segments. The synchronizers shall be capable of supporting generator islanding, base

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26 23 13 - 14 load operations, utility import and generator export. Additionally, these synchronizers shall be networked with the generator synchronizers via Redundant LANs.

R. Each circuit breaker shall be provided with a circuit breaker control switch equipped with open-closed-tripped annunciation and a lockout relay. Each switchgear section shall be provided with IR ports.

S. Power Quality Metering

1. Provide a power quality meter, equal to Schneider PM8000, on each generator breaker and utility breaker. The power quality meter shall have continuous waveform recording at 1024 samples/cycle/channel and meet recording compliance IEC 61000-4-30. The PQM shall have a minimum of 128MB of internal storage and sense voltage harmonics up to the 127th harmonic.

T. System shall communicate with the onsite load bank. Load bank shall be capable of being controlled through the system HMI and Remote annunciators.

U. Arc Flash Detection

1. Provide arc flash detection on each circuit breaker and include a minimum of (2) optical point sensors. One shall be located in the rear of the section and one located at the circuit breaker.

2. Each arc flash detection module shall include (1) relay output and

(1) high speed relay output.

3. Each arc flash detection module shall allow communication between modules.

V. DC Control Power Selector – Best Battery System

1. Control power for the system logic shall be derived from the engine starting batteries and/or an optional station battery system. The control logic shall be powered through a suitable means that 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 and prevent feedback to a failing battery.

The transition of control logic power from any battery combination

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26 23 13 - 15 to any other battery combination shall be accomplished without disruption in the power flow.

2. A single DC-to-DC converter shall provide a constant 24VDC power to the master and generator controllers during starting and cranking of all engine generator sets “simultaneously”.

3. Additionally, the best battery system shall provide power to each generator paralleling circuit breaker trip coil if the generator battery power is lost to its cubicle.

4. 125VDC Station batteries shall be included and provide backup to DC controls.

2.2 REMOTE ANNUNCIATOR PANEL

A. Two 24” touchscreen remote annunciator panels shall be installed that mimic the OIT screen on the master section of the switchgear. Including at //the Engineering Control Center// //location as shown on the drawings//.

B. The annunciator shall indicate alarm conditions as required by NFPA 99 and 110.

C. Connection from the annunciators to paralleling gear will be through fiber connection due to the required distances. Provide all necessary devices to convert Ethernet to fiber. A UPS shall be provided in the remote annunciator assembly to allow ride-through during a power outage. The required 120VAC circuit shall be supplied for energizing the annunciators.

2.4. PARALLELING OPERATION

REFERENCE SEPARATE SEQUENCE DOCUMENT.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Installation shall be as shown on the drawings, manufacturer’s instructions, and per //Section 26 13 13, MEDIUM-VOLTAGE CIRCUIT

BREAKER SWITCHGEAR// //Section 26 23 00, LOW-VOLTAGE SWITCHGEAR//.

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//B. In seismic areas, generator paralleling controls shall be adequately anchored and braced per details on structural contract drawings to withstand the seismic forces at the location where installed.//

C. Mount generator paralleling controls on concrete slab. Unless otherwise indicated, the slab shall be at least 100 mm (4 inches) thick. The top of the concrete slab shall be approximately 100 mm (4 inches) above finished floor. Edges above floor shall have 12.5 mm (1/2 inch) chamfer. The slab shall be of adequate size to project at least 100 mm

(8 inches) beyond the equipment. Provide conduit turnups and cable entrance space required by the equipment to be mounted. Seal voids around conduit openings in slab with water- and oil-resistant caulking or sealant. Cut off and bush conduits 75 mm (3 inches) above slab surface. Concrete work shall be as specified in Section 03 30 00, CAST-

IN-PLACE CONCRETE.

3.2 ACCEPTANCE CHECKS AND TESTS

A. An authorized representative of the generator paralleling controls manufacturer shall technically supervise and participate during all of the field adjustments and tests. Major adjustments and field tests shall be witnessed by the COR. The installing contractor shall certify in writing that the equipment has been installed, adjusted, and tested in accordance with the manufacturer’s recommendations.

B. Perform in accordance with the manufacturer's recommendations. In addition, include the following:

1. Visual Inspection and Tests:

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

b. Inspect physical, electrical, and mechanical condition.

c. Vacuum-clean enclosure interior. Clean enclosure exterior.

d. Verify appropriate equipment grounding.

e. Verify appropriate anchorage and required area clearances.

2. Systems Tests:

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a. Verify proper operation of all control, monitoring, trending, and alarm functions.

b. Verify undisrupted operation of the system under conditions of loss of the generator paralleling controls.

c. Test and verify continuity of all interconnecting copper and fiber optic control media.

C. Perform all acceptance checks and tests specified in Section 26 13 13, MEDIUM-VOLTAGE CIRCUIT BREAKER SWITCHGEAR, Section 26 23 00, LOW-

VOLTAGE SWITCHGEAR, Section 26 32 13, ENGINE GENERATORS.

3.3 FOLLOW-UP VERIFICATION

A. Upon completion of acceptance checks, settings, and tests, the

Contractor shall demonstrate that the generator paralleling controls are in good operating condition and properly performing the intended function.

3.4 INSTRUCTION

A. Furnish the services of a factory-trained technician for two 4-hour periods to instruct personnel in the operation and maintenance of the generator paralleling controls and related equipment on the date requested by the COR.

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