Attachment 3 - 262313 PARALLELING SWITCHGEAR JAN20.pdf

JUBA ELECTRICAL UPGRADE DEVELOPMENT July 13, 2020

JUBA SOUTH SUDAN Issued for Bid

PARALLELING SWITCHGEAR SECTION 262313 - 1

SECTION 262313 - PARALLELING SWITCHGEAR

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes metal-clad, [low] [medium]-voltage, circuit-breaker switchgear rated

[1000] [5000] [15000] [35000] V and less, and associated control systems, for paralleling generators on an isolated bus and for distributing power in ac systems.

B. Related Sections include the following:

1. Section 260508 “Common Work Results for Electrical, Communications and

Electronic Safety” for facility voltages and safety accessories.

2. Section 260518 “Low-Voltage Electrical Power Conductors and Cables.”

3. Section 260525 “Grounding and Bonding for Electrical Systems.”

4. [Division 26 Section on vibration and seismic controls for electrical systems for mounting and anchoring switchgear.]

5. Section 260573 “Overcurrent Protective Device Coordination Study” for arc flash study, ARMS reduction level or alternative means of compliance for worker safety, and arc flash training.

6. Section 260915 "Electrical Power Monitoring" for interfacing communication and metering requirements.

7. Section 262300 "Low-Voltage Switchgear."

8. Section 262315 “Double-Ended Switchgear.”

9. Section 262325 “Power Sequence of Operation.”

10. Section 263214 "Engine Generators."

C. Where requirements in this Section are in conflict with those in Section 263214 "Engine

Generators" and Section 262300 "Low-Voltage Switchgear," the requirements herein shall govern.

1.2 DEFINITIONS

A. GFCI: Ground-fault circuit interrupter.

B. HMI: Human machine interface.

1.3 SUBMITTALS

A. Product Data: For each type of switchgear and related equipment, include the following:

1. Technical data on features, performance, electrical characteristics, ratings, and finishes.

2. Rated capacities, operating characteristics, furnished specialties, and accessories for individual circuit breakers.

PARALLELING SWITCHGEAR SECTION 262313 - 2

3. Features, characteristics, ratings, factory settings, and time-current characteristic curves for individual relays and overcurrent protective devices.

4. Description of sequence of operation for paralleling controls.

B. Shop Drawings: For each type of switchgear and related equipment, include the following:

1. Dimensioned plans, elevations, sections, and details, including required clearances and service space around equipment. Include the following:

a. Tabulation of installed devices with features and ratings.

b. Enclosure types and details.

c. Outline and general arrangement drawing showing dimensions, shipping sections, and weights of each assembled section.

d. Floor plan drawing showing locations for anchor bolts[ and leveling channels].

e. Bus configuration with current rating, size, and number of conductors in each bus run, including phase, neutral, and ground conductors of main and branch buses.

f. Short-time and short-circuit current rating of switchgear assembly.

g. Features, characteristics, ratings, and factory settings of individual overcurrent protective devices and auxiliary components.

h. Nameplate legends.

i. Mimic-bus diagram.

j. Arc flash reduction switch.

k. UL listing for series rating of installed devices.

2. Wiring Diagrams: For switchgear, paralleling control system, and related equipment, include the following:

a. Power, signal, and control wiring.

b. Schematic control diagrams.

c. Diagrams showing connections of component devices and equipment.

d. Three-line diagrams of current and future circuits showing device terminal numbers and internal diagrams.

e. Schematic diagrams showing connections to remote devices.

3. Design Calculations: Signed and sealed by a qualified professional engineer. Calculate requirements for selecting seismic restraints.

C. Coordination Drawings: Floor plans showing dimensioned layout, required working clearances, and required area above and around switchgear where pipe and ducts are prohibited. Show switchgear layout and relationships between components and adjacent structural and mechanical elements. Show support locations, type of support, and weight on each support. Indicate field measurements.

D. Samples: Representative portion of mimic bus with specified finish. Manufacturer's color charts showing colors available for mimic bus.

PARALLELING SWITCHGEAR SECTION 262313 - 3

E. [Manufacturer Seismic Qualification Certification: Submit certification that switchgear, overcurrent protective devices, accessories, and components will withstand seismic forces defined in Division 26 Section on vibration and seismic controls for electrical systems.

Include the following:

1. Basis of Certification: Indicate whether withstand certification is based on actual test of assembled components or on calculation.

2. Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and locate and describe mounting and anchorage provisions.

3. Detailed description of equipment anchorage devices on which the certification is based and their installation requirements.]

F. Certificates of Compliance: Manufacturer of switchgear shall certify compliance with referenced standards.

G. Qualification Data:

1. Support Services Vendor: Identify vendor firm name and contact, location, distance from project, years and servicing product line.

2. Testing Agency: As required in Article on QUALITY ASSURANCE.

H. Source quality-control test reports.

I. Field quality-control test reports.

J. Updated mimic bus diagram reflecting field changes after final switchgear load connections have been made, for record.

K. Operation and Maintenance Data: For switchgear and components to include in emergency, operation, and maintenance manuals. In addition to items specified in Division 01 Section

"Operation and Maintenance Data," include the following:

1. Manufacturer's written instructions for sequence of operation.

2. Manufacturer's sample system checklists and log sheets.

3. Manufacturer's written instructions for testing and adjusting relays and overcurrent protective devices.

4. Time-current curves, including selectable ranges for each type of relay and overcurrent protective device.

1.4 OWNERSHIP OF PROPRIETARY MATERIAL

A. The Government shall retain all rights to software and passwords used for this project.

B. The Government will sign a copy of manufacturer’s standard software and firmware licensing agreement as condition of this contract. Such license shall grant use of all programs and application software to the Government as defined by manufacturer’s license agreement, but shall protect manufacturer’s rights to disclosure of Trade Secrets contained within such software.

PARALLELING SWITCHGEAR SECTION 262313 - 4

C. The licensing agreement shall not preclude use of software by individuals under contract to the

Government for commissioning, servicing, or altering system in future. Use of software by individuals under contract to the Government will be restricted to use on the Government’s computers and only for purpose of commissioning, servicing, or altering installed system.

D. All project developed software, files and documentation shall become the property of the

Government.

1.5 QUALITY ASSURANCE

A. Independent Testing Agency Qualifications: Testing agency that is member company of

InterNational Electrical Testing Association (NETA), and that is acceptable to Contracting

Officer/COR based upon input from OBO/PDCS/DE/EE.

1. Testing Agency's Field Supervisor: Person currently certified by NETA or the National

Institute for Certification in Engineering Technologies (NICET) to supervise on-site testing specified in this Section.

B. Source Limitations: Obtain switchgear through one source from a single manufacturer.

C. [Basis of Design: Drawings indicate size, profiles, and dimensional requirements of switchgear and are based on the specific system indicated.]

D. Comply with the OBO Electrical Code (NFPA 70 “National Electrical Code” as amended by

OBO).

1. Electrical Components, Devices, and Accessories: Listed and labeled in accordance with

Chapter 1 of the OBO Electrical Code by testing agency acceptable to Contracting

Officer/COR based upon input from OBO/PDCS/DE/EE, and marked for intended use.

E. Standards: In addition to standards identified elsewhere in this Section, conform to the following:

1. Institute of Electrical and Electronics Engineers (ANSI/IEEE):

a. C37.13 “Standard for Low-Voltage AC Power Circuit breakers Used in Enclosures.”

b. C37.16 “Switchgear - Low-Voltage Power Circuit Breakers and AC Power Circuit

Protectors - Preferred Ratings, Related Requirements, and Application

Recommendations.”

c. C37.50 “Test Procedures of Low-Voltage AC Power Circuit Breakers Used in

Enclosures.”

d. C37.51 “Conformance Test Procedures of Metal-Enclosed Low-Voltage AC

Power Circuit Breaker Switchgear Assemblies.”

2. National Electrical Manufacturers Association (NEMA):

a. SG3 Low Voltage Power Circuit Breakers.

b. SG5 Power Switchgear Assemblies.

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3. Underwriters Laboratories, Inc. (UL):

a. 1558 “Metal Enclosed Low-Voltage Power Circuit Breaker Switchgear.”

F. Support Service Capability: Manufacturer approved support services Vendor to commission switchgear and available to provide ongoing maintenance services. Vendor shall be approved by manufacturer. Vendor shall be located within 1500 km (1000 miles) of project site. Vendor shall have performed these services on this product line for at least five years.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Deliver switchgear in sections of lengths that can be moved past obstructions in delivery path.

B. Storage: Store in one of the following manners:

1. Store switchgear indoors in clean dry space with uniform temperature to prevent condensation. Protect switchgear from exposure to dirt, fumes, water, corrosive substances, and physical damage.

2. If stored in areas subjected to weather, cover switchgear to provide protection from weather, dirt, dust, corrosive substances, and physical damage. Remove loose packing and flammable materials from inside switchgear; install electric heating (250 W per section) to prevent condensation.

1.7 PROJECT CONDITIONS

A. [Installation Pathway: For renovation and system upgrade projects, remove and replace building components and structures to provide pathway for moving switchgear into place.]

B. [Existing Utilities: Do not interrupt utilities serving facilities occupied by Government or others unless permitted under the following conditions and then only after arranging to provide temporary utility services according to requirements indicated:

1. Notify Contracting Officer/COR not less than seven days in advance of proposed utility interruptions. Identify extent and duration of utility interruptions.

2. Indicate method of providing temporary utilities.

3. Do not proceed with utility interruptions without Contracting Officer/COR’s written permission.]

C. Product Selection for Restricted Space: Drawings indicate maximum dimensions for switchgear, including clearances between switchgear and adjacent surfaces and other items. Comply with indicated maximum dimensions.

D. Environmental Limitations: Rate equipment for continuous operation at indicated ampere ratings for the following conditions:

PARALLELING SWITCHGEAR SECTION 262313 - 6

1. Ambient temperature not exceeding [40 deg C (104 deg F)] [50 deg C (122 deg F)] [60 deg C (140 deg F)].

2. Altitude: Derate as required if over <Insert elevation> above sea level.

3. <Insert unusual service conditions.>

1.8 COORDINATION

A. Coordinate layout and installation of switchgear and components with other construction that penetrates ceilings or is supported by them, including conduit, piping, equipment, and adjacent surfaces. Maintain required clearances for workspace and equipment access doors and panels.

B. Coordinate size and location of concrete bases. Concrete, reinforcement, and formwork requirements are specified in Section 033000 “Cast-in-Place Concrete.”

1.9 EXTRA MATERIALS

A. Furnish extra materials described below that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Fuses: Six of each type and rating used. Include spares for potential transformers, control power circuits and fusible devices. Fuses are specified in Division 26 Section on fuses.

2. Indicating Lights: Six of each type installed.

3. Touchup Paint: Two containers of paint matching enclosure finish, each 250 mL (0.5 pint).

B. Maintenance Tools: Furnish tools and miscellaneous items required for switchgear test, inspection, maintenance, and operation. Include the following:

1. Traveling-type lifting device, rail mounted on top of switchgear and all other items necessary to remove circuit breaker from housing and transport to remote location.

2. Racking handle to move circuit breaker manually between connected and disconnected positions, and a secondary test coupler to permit testing of circuit breaker without removal from switchgear.

PART 2 - PRODUCTS

2.1 GENERATOR PARALLELING MONITOR AND CONTROL SYSTEM

A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated in to the Work include, but are not limited to, the following:

1. Caterpillar; Engine Div.

2. Emerson; ASCO Power Technologies, LP.

3. GE Zenith Controls.

4. Kohler Co.; Generator Division.

PARALLELING SWITCHGEAR SECTION 262313 - 7

5. Onan Corp.; Cummins Inc.; Industrial Business Group.

6. Russelectric.

B. Individual Generator Control and Monitoring Panel: Provide each generator with a control and monitoring panel that allows the operator to view status and control operation of respective generator. Provide panel with the following features and characteristics:

1. Generator Metering: 1 percent accuracy class or better.

a. Ammeter, Voltmeter, Frequency Meter, Wattmeter, Kilowatt-Hour Meter, and

Power Factor Meter:

1) For three-phase and four-wire systems, indicate line-to-line and line-to-neutral conditions on voltmeter.

2) Provide switches or other provisions to allow reading of both generator and bus voltages and frequencies from this metering set.

b. Synchroscope and "Generator Set Synchronized" Indication:

1) Provide lamp or LED indication of synchronization.

2) Provide electronic synchronization control.

c. Engine run-time meter, start counter, rpm meter, and battery voltage meter.

d. Engine oil temperature gage and engine coolant temperature gage.

2. Generator Protective and Control Switches: Provide oiltight, industrial-grade switches in generator control and monitoring panel.

a. Mode Selector Switch (Run/Off/Auto):

1) "Run" mode to start and accelerate unit to rated speed and voltage, but not close paralleling circuit breaker.

2) "Off" mode to prevent generator from starting or to immediately shutdown generator if running.

3) "Auto" mode to allow generator to start on receipt of remote start signal.

b. Circuit-Breaker Trip/Close Switch: Interlocked with system control so that circuit-breaker closure is impossible unless the following occurs:

1) Mode selector switch is in "Run" position.

2) Generator set is synchronized with system bus.

c. Control/reset push button with flashing lamp to indicate generator is locked out due to fault condition.

d. Lamp test push button to simultaneously test all lamps on panel.

e. Control Panel Illumination: DC lamps to illuminate panel when lighting from surrounding environment is not available.

f. Emergency Stop Push Button: Red mushroom-head switch maintaining its position until manually reset.

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g. Voltage and Frequency Raise/Lower Switches:

1) Allow plus/minus 5 percent adjustment when generator set is operating but not paralleled.

3. Generator Protective and Control Devices: Solid-state industrial relays, integrated microprocessor-based control devices, and other accessories and devices located either in generator control and monitoring panel or in switchgear control section to provide the following features and functions:

a. Kilowatt Load Sharing Control:

1) Operates engine governors during synchronizing and provides isochronous load sharing when paralleled.

2) Allows generator set to ramp up to kilowatt load level signaled by system master controller.

b. Load-Demand Governing Control:

1) Causes generator set to ramp down to zero load when signaled to shut down in load-demand mode.

2) Causes generator set to ramp up to a proportional share of total bus load.

c. Kilovolt Ampere Rating Load Sharing Control:

1) Operates alternator excitation system while generator set is paralleled.

2) Causes sharing of reactive load among all generator sets to within 1 percent of equal levels without voltage drop.

d. Sync-Check and Paralleling Monitor and Control:

1) Monitors and verifies that generator set has reached 90 percent of nominal voltage and frequency before closing to bus.

2) Prevents out-of-phase paralleling if two or more generator sets reach operating conditions simultaneously, by sending "inhibit" signal to sets not designated by system as "first to close to bus."

3) Recognizes failure of "first-to-close" generator set and signals system paralleling to continue.

4) Prevents out-of-phase closure to bus due to errant manual or automatic operation of synchronizer.

e. Synchronizer Control:

1) Adjusts engine governor to match voltage, frequency, and phase angle of paralleling bus.

2) Maintains generator-set voltage within 1 percent of bus voltage, and phase angle within 20 electrical degrees of paralleling bus for 0.5 seconds before circuit-breaker closing.

PARALLELING SWITCHGEAR SECTION 262313 - 9

3) Provides "fail-to-synchronize time delay" adjustable from 10 to 120 seconds;

with field selectivity to either initiate alarm or shut down generator set on failure condition.

f. Reverse Power Monitor and Control:

1) Prevents sustained reverse power flow in generator set.

2) Trips generator circuit breaker and initiates generator set shutdown when reverse power condition exceeds 10 percent of generator set kilowatt for three seconds.

g. Phase Rotation Monitor and Control:

1) Verifies generator set and paralleling bus phase rotation match prior to closing paralleling circuit breaker.

h. Electronic Alternator Overcurrent Alarm and Shutdown Control:

1) Monitors current flow at generator-set output terminals.

2) Initiates alarm when load current on generator set is more than 110 percent of rated current for more than 60 seconds.

3) Provides overcurrent shutdown function matched to thermal damage curve of alternator. Provide without instantaneous-trip function.

i. Electronic Alternator Short-Circuit Protection:

1) Provides shutdown when load current is more than 175 percent of rated current and combined time/current approaches thermal damage curve of alternator. Provide without instantaneous-trip function.

j. Loss of Excitation Monitor:

1) Initiates alarm when sensing loss of excitation to alternator while paralleled to system bus.

k. Generator-Set Start Contacts: Redundant system, 10 A at 32-V dc.

l. Cool-Down Time-Delay Control: Adjustable, 0 to 600 seconds.

m. Start Time-Delay Control: Adjustable, 0 to 300 seconds.

n. Paralleling Circuit-Breaker Monitor and Control:

1) Monitors circuit-breaker auxiliary contacts.

2) Initiates fault signal if circuit breaker fails to close within adjustable time-delay period (0.5 to 15 seconds).

3) Trips open and locks out paralleling circuit breaker upon paralleling circuit breaker failure to close, until manually reset.

PARALLELING SWITCHGEAR SECTION 262313 - 10

4. Engine Protection and Local Annunciation:

a. Provide annunciation and shutdown control modules for alarms indicated.

b. Provide visual alarm status indicator and alarm horn with silence/acknowledge push button on generator control and monitoring panel.

c. Annunciate the following conditions:

1) Status, Light Only (Nonlatching):

a) Generator engine control switch not in auto (red).

b) Generator engine control switch in auto (green).

c) Emergency mode (red).

d) Generator circuit breaker closed (red).

e) Generator circuit breaker open (green).

f) Engine stopped (green).

g) Engine running (red).

h) Engine cool-down (amber).

2) Pre-Alarm, Light and Horn (Nonlatching):

a) Pre-high coolant temperature (amber).

b) Pre-low oil pressure (amber).

c) Low coolant temperature (amber).

d) Engine low battery (amber).

e) Engine low fuel (amber).

f) Generator fails to synchronize (amber).

3) Shutdown Alarm, Light and Horn (Latching):

a) Engine overcrank (red).

b) Engine overspeed (red).

c) Engine low oil pressure (red).

d) Engine high coolant temperature (red).

e) Engine low coolant level (red).

f) Engine remote emergency shutdown (red).

g) Generator circuit breaker tripped (red).

h) Generator loss of field (red).

i) Generator reverse power (red).

j) Generator undervoltage (red).

k) Generator overvoltage (red).

l) Generator underfrequency (red).

m) Generator overfrequency (red).

C. Master Control System and Monitoring Equipment: Paralleling and monitoring equipment, components, and accessories for multiple generators with the following features and characteristics:

1. Components and devices shall be mounted in the switchgear control section of the switchgear lineup.

PARALLELING SWITCHGEAR SECTION 262313 - 11

2. Paralleled System Metering: 1 percent accuracy class or better to monitor total output of generator bus.

a. Ammeter, voltmeter, frequency meter, wattmeter, kilowatt-hour meter, power factor meter, kilovolt ampere, kilovolt ampere rating, and kilowatt demand meters.

1) For three-phase/four-wire systems, indicate line-to-line and line-to-neutral conditions on voltmeter.

2) Display all functions on the HMI device.

3. Full-Color HMI Device: Touchscreen with minimum viewing area of 400 sq. cm. (60 sq.

inches).

a. Allows operator to monitor and control the complete system of paralleled generator sets.

b. Screens shall include the following:

1) Main Menu: Include date, time, and system status messages with screen push buttons to access one-line diagram, system controls, load controls, alarms, bus metering, and individual generator-set data.

2) One-Line Diagram Screen: Depicting system configuration and system status by screen animation, screen colors, text messages, or pop-up indicators.

Indicate the following minimum system conditions:

a) Generator sets, buses, and paralleling circuit breakers energized/de-energized.

b) Generator-set mode (run/off/auto).

c) Generator-set status (normal/warning/shutdown/load-demand stop).

d) Paralleling circuit-breaker status (open/closed/tripped).

e) Bus conditions (energized/de-energized).

f) Provide access to other screens.

3) AC Metering Screen: Displays the following minimum meter data for the paralleling bus:

a) Phase volts and amperes, kilowatt, kilovolt ampere, kilovolt ampere rating, power factor, frequency, kilowatt hour, and kilowatt demand.

b) Real-time trend chart for system kilowatts and volts updated on not less than one-second intervals.

c) A minimum of one historical trend chart for total system loads with intervals no shorter than five minutes and a minimum duration of four hours.

4) Generator-Set Control Screen: Provides control over individual generator sets from master system control panel. Includes the following minimum functions:

PARALLELING SWITCHGEAR SECTION 262313 - 12

a) Generator manual start/stop control (functional only when generator-set mounted control switch is in "Auto" position).

b) Generator-set alarm reset.

c) Manual paralleling and circuit-breaker controls.

5) Generator-Set Data Display Screen: Provide the following minimum parameters:

a) Engine speed, oil pressure and temperature, coolant temperature, and engine operating hours.

b) Three-phase voltage and current, kilowatt, power factor, and kilowatt hour.

c) Generator control switch position and paralleling circuit-breaker position.

d) All generator-set alarms.

6) System Control Screen: Password protected and with the following minimum functions:

a) System Test Modes: Test with load/test without load/normal/retransfer time-delay override.

b) Test with Load: Starts and synchronizes generator sets on paralleling bus; all loads are transferred to bus.

c) Test without Load: Starts and synchronizes generator sets on paralleling bus but does not transfer loads to bus.

d) Time adjustments for retransfer time delay, transfer time delay, system time delay on stopping, and system time delay on starting.

7) Load-Demand Control Screen: Monitors total load on system bus and controls number of generator sets running so that capacity tracks load demand.

a) Load-Demand Control: On/off.

b) Load-Demand Pickup Set Point: Adjustable from 90 to 40 percent in

5 percent increments.

c) Load-Demand Dropout Set Point: Adjustable from 20 to 70 percent in

5 percent increments.

8) Manual Load Control Screen: Allows operator to manually add or delete generator sets from paralleled system in response to system load parameters.

a) Indication of system available in kilowatts and amperes.

b) Control functions allow manual addition/removal of generator sets on system, and activation of load-shed/load-restore functions.

9) Load-Add/Load-Shed Sequence Screen: Password protected and with the following minimum functions:

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a) Assigns "load-add sequence priority" to each load control relay with designation for relay operation after a set number of generator sets are online.

b) Assigns "load-shed sequence priority" to each load control relay with designation for relay operation depending on number of generator sets online.

10) Alarm Summary and Run Report Screen:

a) Lists most recent alarm conditions and status changes.

b) Lists a minimum of the most recent 32 alarm conditions by name and time/date; acknowledges alarm conditions with time/date.

c) For each start signal, lists start time and date, stop time and date, maximum kilowatt and ampere load on system during run time, and start and stop times of individual generator sets.

4. Solid-State System Status Panel:

a. Provides visual alarm status indicator and alarm horn with silence/acknowledge push button.

b. Annunciates the following conditions:

1) Status, Light Only:

a) Running Status: Display generator set number and "green" running-status light.

b) Load demand mode (green).

c) Priority Load Status: Display load number and "green" on-status light.

d) System test (green).

e) Remote system start (red).

f) Normal source available (green).

g) Connected to normal (green).

h) Generator source available (green).

i) Connected to generator source (green).

2) Status, Light and Alarm:

a) Load-Shed Level Status: Displays load number and red load-shed, status light.

b) Generator Alarm Status: Displays generator number and red "Check

Generator" status light.

c) Controller malfunction (red).

d) Check station battery (red).

e) Bus overload (red).

f) System not in auto (red).

PARALLELING SWITCHGEAR SECTION 262313 - 14

D. Description of System Operation:

1. Loss of Normal Power:

a. System receives "start" signal; all generator sets start and achieve rated voltage and frequency.

b. System closes the first generator set achieving 90 percent of rated voltage to paralleling bus.

c. "Priority load add" controls prevent overloading of system.

d. Remaining generator sets switched to synchronizers that control and then allow closure of generator sets to paralleling bus.

e. On closure to paralleling bus, each generator set assumes its proportional share of total load.

2. Failure of a Generator Set to Start or Synchronize:

a. After expiration of overcrank time delay, generator set shuts down and alarm is initiated.

b. Priority controller prevents overload of system bus.

c. Manual override of priority controller at HMI allows addition of low-priority load to bus.

d. Bus overload monitor protects bus from manual overloading.

3. Bus Overload:

a. On bus overload, load-shed control initiates load shedding.

b. If bus does not return to normal frequency within adjustable time period, additional load continues to be shed until bus returns to normal frequency.

c. Loads shed can be reconnected to bus only by manual reset at HMI.

4. Load-Demand Mode:

a. With "load-demand" function activated, controller continuously monitors total bus load.

b. If bus load is below preset limits for 15 minutes, demand controller shuts down generator sets in predetermined order until minimum number of sets are operating.

c. On sensing available bus capacity diminished to set point, controller starts and closes generator sets to bus to accommodate load.

5. Return to Normal Power:

a. Process starts on removal of start signals from system.

b. When no load remains on paralleling bus, all generator breakers open, go through cool-down period, and shut down.

c. If start signal is received during cool-down period, one generator set is reconnected to bus, and system operation follows that of "loss of normal power."

PARALLELING SWITCHGEAR SECTION 262313 - 15

2.2 SWITCHGEAR

A. Refer to Section 262300 “Low-Voltage Switchgear” for requirements for low voltage, metal-clad, circuit breaker, Instruments, Surge Arrestors, Provisions, ARMS, associated components, and

Control Components. Provide additional features as indicated below.

B. Mechanical Interlock: Provide mechanical interlock where dual feed sources are installed.

Mechanical interlock shall limit closing of individual breaker pairs fed from dual sources.

C. Spare Generator Connection: Switchgear shall have spare control breaker to connect portable temporary generator.

1. Provide connection point for cabling for power and control.

2. Ensure that paralleling switchgear controls are capable of operating with portable generator.

3. Size breaker, conductors and cabling so that they are two times size required for single facility generator.

4. Operational Interface: A qualified engineer shall analyze two operational situations below, and coordinate system design accordingly:

a. Synchronize with Facility Generators: If portable generator is suitable for paralleling with facility generators, then switchgear controls shall operate generator for synchronization.

b. Operate as Stand Alone Generator: However, if generator is not capable of synchronizing with facility generators, then system shall be developed with procedures to load-shed non-critical loads to operate system on single portable generator.

2.1 FACTORY TESTING

A. Perform factory test of switchgear.

1. Perform each case identified in Article on SEQUENCE OF OPERATIONS in Section

262325 “Power Sequence of Operation.”

2. Re-test all failed test until successful test is achieved.

3. Factory testing may be witness by Government representative. Provide notification to

Contracting Officer/COR within 30 days of scheduled test. Government representative may perform factory inspection at that time as well.

2.2 SOFTWARE

A. At project closeout, submit two electronic copies of PLC software, password, operating software platform, and source code to Contracting Officer/COR for distribution to Post Facility Manager and OBO/CFSM/FM/PS. The PLC software will facilitate future modifications to power transfer scheme by Post Facility Manager, and the operating software platform will facilitate future reading of PLC software by programmer.

PARALLELING SWITCHGEAR SECTION 262313 - 16

1. In addition, submit two hardcopy manuals of PLC software and code to Contracting

Officer/COR for similar distribution.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine elements and surfaces where switchgear will be installed for compliance with installation tolerances, required clearances, and other conditions affecting performance.

1. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 INSTALLATION

A. Comply with applicable portions in NECA 400.

B. Anchor switchgear assembly to 100-mm (4-inch) channel-iron embedded in concrete base and attach by bolting.

1. Sills: Select to suit switchgear; level and grout flush into concrete base.

2. [Design each fastener and support to carry load indicated by seismic requirements and according to seismic-restraint details. See Division 26 Section on vibration and seismic controls for electrical systems for seismic-restraint requirements.]

3. Concrete Bases: Install in accordance with Section 260508 “Common Work Results for

Electrical, Communications, and Electronic Safety.”

C. Surge Arresters:

1. Install in cable termination compartments, and connect in each phase of circuit.

2. Place surge arresters so status and indicator lights are visible to operators in room.

D. Temporary Lifting Provisions: Remove temporary lifting eyes, channels, brackets, and temporary blocking of moving parts from switchgear units and components.

3.3 IDENTIFICATION

A. Identify field-installed conductors, interconnecting wiring, and components; provide warning signs as specified in Division 26 Section on identification for electrical systems.

B. Diagrams and Instructions:

1. Frame and mount under clear acrylic plastic on front of switchgear.

PARALLELING SWITCHGEAR SECTION 262313 - 17

a. Operating Instructions: Printed basic instructions for switchgear, including control and key-interlock sequences and emergency procedures.

b. System Power Riser Diagrams: Depict power sources, feeders, distribution components, and major loads.

2. Storage for Maintenance: Include a rack or holder, near the operating instructions, for a copy of maintenance manual.

3.4

CONNECTIONS

A. Ground equipment according to Section 260525 “Grounding and Bonding for Electrical

Systems.”

B. Connect wiring according to Section 260518 “Low-Voltage Electrical Power Conductors and

Cables.”

3.5

FIELD QUALITY CONTROL

A. Prepare for acceptance tests as follows:

1. Test insulation resistance for each switchgear bus, component, connecting supply, feeder, and control circuit.

2. Test continuity of each circuit.

B. Manufacturer's Field Service: Engage a factory-authorized service representative to perform the following:

1. Inspect switchgear installation, including wiring, components, connections, and equipment. Test and adjust components and equipment.

2. Verify that electrical control wiring installation complies with manufacturer's submittal by means of point-to-point continuity testing. Verify that wiring installation complies with requirements in Division 26 Sections.

3. Complete installation and startup checks according to manufacturer's written instructions.

4. Assist in field testing of equipment including pretesting and adjusting of equipment and components.

5. Report results in writing

C. Testing: After installing switchgear and after electrical circuitry has been energized, demonstrate capability of switchgears and compliance with requirements.

1. Perform each electrical test and each visual and mechanical inspection in accordance with

InterNational Electrical Testing Association (ANSI/NETA) “Standard for Acceptance

Testing Specifications for Electrical Power Equipment and Systems (ATS).” Certify compliance with test parameters. Perform NETA ATS tests and inspections for each of the following NETA ATS categories:

PARALLELING SWITCHGEAR SECTION 262313 - 18

a. Switchgear: Perform tests and inspections stated in NETA ATS Section 7.1.

b. Circuit Breakers: Perform tests and inspections stated in NETA ATS Section 7.6.

1) Primary Injection

2) Secondary Injection

c. Protective Relays: Perform tests and inspections stated in NETA ATS Section 7.9.

d. Instrument Transformers: Perform tests and inspections stated in NETA ATS

Section 7.10.

e. Metering and Instrumentation: Perform tests and inspections stated in NETA ATS

Section 7.11.

f. Ground-Fault Systems: Perform tests and inspections stated in NETA ATS

Section 7.14.

2. Correct malfunctioning units on-site where possible, and retest as specified above until compliance is demonstrated.

D. Infrared Scanning: After Substantial Completion, but not more than 60 days after Final

Acceptance, perform an infrared scan on each switchgear. Remove front and rear panels so joints and connections are accessible to portable scanner. Testing shall include connections and inductive heating of cabling at entrances or where racked in trenches.

1. Follow-up Infrared Scanning: Perform an additional follow-up infrared scan of each switchgear 11 months after date of Substantial Completion.

2. Instrument: Use an infrared scanning device designed to measure temperature or to detect significant deviations from normal values. Provide calibration record for device.

3. Record of Infrared Scanning: Prepare a certified report that identifies switchgear checked and that describes scanning results. Include notation of deficiencies detected, remedial action taken, and observations after remedial action.

3.6 ADJUSTING

A. Set field-adjustable, protective-relay trip characteristics according to results in Section 260573

"Overcurrent Protective Device Coordination Study."

3.7 CLEANING

A. On completion of installation, inspect interior and exterior of switchgear. Vacuum dirt and debris;

do not use compressed air to assist in cleaning. Repair damaged finishes.

3.8 PROTECTION

A. Temporary Heating: Apply temporary heat to switchgear, according to manufacturer's written instructions, throughout periods when switchgear environment is not controlled for temperature and humidity within manufacturer's stipulated service conditions.

PARALLELING SWITCHGEAR SECTION 262313 - 19

3.9 DEMONSTRATION

A. Engage a factory-authorized service representative to train post maintenance personnel to adjust, operate, and maintain switchgear. Refer to Division 01 Section "Demonstration and Training."

1. Train on procedures and schedules for general troubleshooting, servicing, and maintain-ing equipment and schedules, and for equipment isolation and de-energization proce-dures.

2. Refer to Article on ARC FLASH TRAINING in Section 260573 “Overcurrent Protective

Device Coordination Study” for associated training requirements.

3. Review data in maintenance manuals.

4. Schedule training with the Contracting Officer/COR with at least seven days' advance notice.

END OF SECTION 262313