Paralleling Switchgear (PSG)GE Zenith Capabilities - Overview

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GE Zenith Controls Paralleling Switchgear (PSG)First system built in 1975

Currently ~ 150 systems/year

Currently building project #1280

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What is a Paralleling Switchgear System (PSG) ?Primary Source(Normally Energized)Controls and switchgear, acting as a system, to manage & distribute emergency power and/or reduce energy costs thru intelligent use of local generationGenset #1Paralleling BreakerDistribution BreakersService Entrance BreakerATSCritical LoadsEmergencySystem(Normally De-energized)

NormalSystem(Normally Energized)

Genset #2Genset #3UtilityBreakerParalleling Bus

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Increased Backup Power Supply CapacityWhen backup supply needs are > capacity 1 GenBackup Supply RedundancyProvides N + 1,2,etc redundancy. Critical loads not reliant on only 1 Genset Operational Flexibility Ability to switch loads between multiple sources (including Gensets) for maintenance & test without interrupting power to the loadsReduced Energy BillsTurn on-site generation capability into an money-saving Asset, with start/stop/loading intelligence for reduced energy & demand charges.Key Benefits of PSG?

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Single Genset Single Utility Soft Load Transfer SwitchFor small facility standby & distributed generationMultiple-Genset StandbyFor Life Safety or Business Critical standby power to selected high-priority loads. Utility Paralleling, Peak Shaving Paralleling of Generator(s) and Utility supplies for backup of entire facility and reduced energy charges.Mission Critical StandbyTurning on-site generation capability into an Asset, with start/stop/loading intelligence for reduced energy & demand charges.Typical Systems built by GE Zenith Controls

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Examples of Typical GE Zenith Systems

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Type 1 Single Gen, Single Utility Soft Load Transfer Switch

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EngineGeneratorSpeed ControlUtilitySupplyStandbyGeneratorBuildingLoadGCBMCBSingle Gen, Single Utility ArchitectureBuildingDist. SystemUtility SupplyBreakerGen SupplyBreaker(N/O)(N/C)Soft Load Transfer Switch

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GCBMCBUtility/PrimarySupplyGenset/BackupSupplyCriticalLoadMode:GenStatus:UtilityStatus:NormalOFFEnergized. kW Varies.kW = FacilityLoadGCBMCBStandbyRunning.kW Varies.kW = Facility LoadFailed/Off.

SoftRe-TransferTo Utility

Running.Initial kW =Facility Load

Final kW=~10% RatedRunning.Initial kW= 0kW

Final kW=Facility LoadkWkWSequences of Operation Softload Transfer Switch

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GCBMCBMode:GenStatus:UtilityStatus:BaseLoad ModeEnergized. kW Varies.kW = FacilityLoad in excessOf FixedGen kWRunning.kW Fixed.kW = Preset/Fixed(typically80-100%Genset Capacity)Import(Export)ModekW LevelTimekW LevelTimekW LevelTimekWkWkWEnergized. kW Fixed.kW = FixedImport orExportLevel (kW)Running. kW Varies.kW = FacilityLoad in excessOf ImportSetpointGCBMCBkW LevelTimekW LevelTimekW LevelTimekWkWkWBaseloadSetpointImportSetpointSequences of Operation Softload Transfer Switch

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Generator & Utility Protection via:GE Multilin G30 Peak Shaving Control via:Woodward GCP-32 Peak Shaving Controller communications via:Woodward GW4 (Modbus)Plus:Manual Control SwitchesSafety Lockout/86 RelayLED Status Annunciation

Control Panel Softload Transfer SwitchLAN/WANLocal Monitoring and email Alarm transmission via:Enervista Viewpoint Monitoring

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EngineGenerator3 CTsV (PTS)V (PTS)3 CTSUtilitySupplyCriticalLoadClosed Transition ATS or 5-cycle CBsGE Multilin G30 RelayGCBMCBMeter #1:GeneratorSourceMetering(GM)Meter #2:UtilitySourceMetering(UM)Meter #1: Utility Meter (UM) : Utility Supply kW, Energy, etc.Peak Shaving Savings = (LM * Rate Structure) (UM * Rate Structure)Site Level: Peak Shave System MeteringMeter #2: Generator Meter (GM) : Generator Supply kW, Energy, etc.Virtual Meter #1: Load Meter (LM = GM + UM) {Developed in GE Aggregator }

GensetSupply

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Peak Shave Savings Reports GE Aggregator123Setup Utility billing structureSetup custom site bills (showing usage or savings)Enter Begin & End dates & create/ view billsExport reports for printing, sending, or filing4

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Local & Remote Access to ReportsSite Level Site Peak Shaving Control Systems w/ local GE Enervista Viewpoint Unlimited # SitesLEVEL 2: Regional Energy Aggregator (REA) (1 Server/~100 Sites)LEVEL 3: Enterprise Energy Aggregator (EEA) (Qty. 1)LEVEL 4: Enterprise Energy Aggregator Viewers (Up to 5 concurrent users)GE Zenith ZTSSLLAN or VPNUp to~ 100 Sitesper AggregatorEst. (6) REAs for full 630-site configurationWeb ServerLocal data-logging by Multilin G30sUpload Data-Logs Aggregates, or combines date from from the (6) REA servers.View reports from EEA.GE Zenith ZTSSL

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GE Zenith Design Recommendations

True PQ Metering of Both Sources, including Waveform and Events Capture for quick diagnosis of system events and outages

Utility grade protective relaying for equipment and personnel safety - due to extended nature of utility paralleling.

Open protocol Modbus communications for easy facility integration

Plug-and-Play PC Monitoring for low cost, but effective system monitoring and alarm management, including automatic email generation of any/all alarm events

Key-lockable Control Switches for safety

Automatic report generation for: Utility and Generator Energy supply (kWH), Demand (kW), and Peak Shave savings (based on site-specific utility rate structure).

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Type 2 Multiple Genset Standby

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Genset #1ATSGenset #2Genset #3Paralleling BusMultiple Genset Standby Typical ArchitecturePrimary DistributionSecondary DistributionEmergencyPanelboardEmergency Loads

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Genset #1ATSGenset #2Typical Sequence of Operation for PSG On loss of Utility1Utility Supply Fails

2ATS Send start signal to all Gens

3All Gens start. PSG control system monitors. 1st Gen at rated Volts & Freq is connected to the Paralleling Bus.Paralleling Bus5PSG Controls synchronize 2nd and 3rd Gensets to Bus (speed and volts bias to Gen Gov & AVR), and close CBs at point of synchonism (see above).6PSG Controls remove xfer inhibits on lower priority ATS to permit connection to Gen system.PSG Controls shed low priority ATS if Gens are overloaded. PSG permits manual or auto re-connect.7XPSG Controls shed low priority ATS if Gens are overloaded. PSG permits manual or auto re-connect.8Priority 1 ATS Xfer to Gens. PSG inhibits xfer of lower priority ATS to prevent Gen overload.4

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Typical Sequence of Operation for PSG On Return of Utility1Utility Supply Returns

2ATSs retransfer loads to Utility, after preset time delays, and remote start commands.3When last ATS removes start command, PSG Controls open all Gen CBs4PSG controls hold start signal to all Gens to permit cooldown at no load. 5After cooldown timer expires, PSG controls remove start signals to Gensets. 6Gensets shut down and remain ready for next utility outage.Genset #1ATSGenset #2Paralleling Bus

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Typical GE Zenith ConfigurationOther key items (inside)GE Fanuc PLC (Single or Redundant)Flexible Woodward SPMA (sync) and LSM (load Sharing) modulesHardwired backup switches for load add/shedBackup 24 VDC power supply for system ride-thru on DC control power problems

Highly visible, LED Annunciation for instant viewing and viewing from distanceFull manual paralleling control switches (Auto/Manual, Sync Switch, CB Open/close, Synchroscope/V/Hz meters on swing panel)Generator Analog Metering for best viewing of Gen & Utility stabilityGenerator Protective Relay (typically Utility grade for MV, Industrial grade for LV)Totalizing Power Quality Meter (PQM) with waveform & diagnostic capabilitySimple Operator Interface Panel (OIP) for setup of time delays, load add/shed, etc.

Key Items GE Recommendation

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Type 3 Utility Paralleling, Peak Shaving

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GensetBreakersUtility SupplyUtility Paralleling, Peak ShavingFacility LoadsFeeder BreakersTypical ArchitectureGenerators sized to high% of total facility loadsUtility CB and Gen CBs act as a Transfer Switch, switching 2 sources of power to main bus in event of Utility outage. Re-transfer to utility either Open or Closed Transition (typically closed)Main bus is fed from 2 sources power utility supply (primary) and generator supply (backup)Bus AIC/Short circuit rating sized to capacity of utility + all Gensets.

Main Bus

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Utility Paralleling - Base LoadingGCBUtility SupplyLoad kW LevelTimeGen kW LevelTimeUtility kW LevelTimekWkWkWBaseloadSetpointGCBkWGenset Base Load:1Utility Supply Available

2When pre-programmed conditions for Genset starting satisfied (Utility load >x, time of day, etc) PSG Controls start Gensets, synchonize to utility supply, and close Gen CBs.3PSG system controls kW on Gensets to fixed, base load level.

4As system load varies, Utility supply kW varies to supply the load.5When Gen supply no longer needed, PSG Controls slowly ramp load back to utility supply and open Gen CB;s at near no-load. 5PSG controls cooldown and shutdown Gensets.kW

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Utility Paralleling - Import/ExportGCBMCBLoad kW LevelTimeGen kW LevelTimeUtility kW LevelTimekWkWkWBaseloadSetpointGCBkWUtility Import/Export:1Utility Supply Available

2When pre-programmed conditions for Genset starting satisfied (Utility load >x, time of day, etc) PSG Controls start Gensets, synchonize to utility supply, and close Gen CBs.3PSG system controls kW on Gensets to maintain fixed kW value on Utility supply (import or export).4As system load varies, Genset supply kW varies to supply the load.5When Gen supply no longer needed, PSG Controls slowly ramp load back to utility supply and open Gen CB;s at near no-load. 5PSG controls cooldown and shutdown Gensets.

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Typical GE Zenith ConfigurationOther key items (inside)GE Fanuc PLC (Single or Redundant)Flexible Woodward SPMA (sync) and LSM (load Sharing) modulesHardwired backup switches for load add/shedBackup 24 VDC power supply for system ride-thru on DC control power problems

Highly visible, LED Annunciation for instant viewing and viewing from distanceFull manual paralleling control switches (Auto/Manual, Sync Switch, CB Open/close, Synchroscope/V/Hz meters on swing panel)Full, Open transition, manual control of Utility CBGenerator Analog Metering for best viewing of Gen & Utility stabilityGenerator Protective Relay (Utility grade)Totalizing Power Quality Meter (PQM) with waveform & diagnostic capabilityIndustrial Computer with graphical 1-lines, load controls, trending, alarm management.

Key Items GE Recommendation

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Type 4 Mission Critical Standby

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Mission Critical Standby Typical Architecture Tier 4 Data CenterSystem A Gen BusSystem B Gen BusSystem A Utility BusUnit SubsUtil AGen AUnit SubsGen BUtil BUnit SubsUtil AGen BUnit SubsGen AUtil BSystem B Utility BusComplete system redundancy Tier 4 classification100% Backup Generator N+1 capacity2 x Independent Gen Paralleling systems, each capable of 100% backup & control of other system (GE Zenith-Fanuc unique design for Quadruple redundancy!

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Typical GE Zenith ConfigurationFull Manual backup, visible LEDs, Utility Grade relaying, PQ MeteringSynchronized-backup PLC each Gen System (2 x PLC each Gen system)Gen System Graphical Display, + large monitor each system for display downstream load statusEach System Master control capable backup of other systemKey Items GE RecommendationGen AGen BUtil BUtil A

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ZDEC 2020