Paralleling Switchgear (PSG) GE Zenith Capabilities - Overview

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 generation

Genset #1

Paralleling Breaker

Distribution Breakers

Service Entrance Breaker

ATS

Exit

Critical Loads

EmergencySystem

(Normally De-energized)

NormalSystem(Normally Energized)

Genset #2 Genset #3

UtilityBreaker

Paralleling Bus

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•Increased Backup Power Supply Capacity

– When backup supply needs are > capacity 1 Gen

•Backup Supply Redundancy

– Provides “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 loads

•Reduced Energy Bills– Turn 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 Switch

For small facility standby & distributed generation

•Multiple-Genset Standby

For 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

Examples of Typical GE Zenith Systems

Type 1 – Single Gen, Single Utility Soft Load Transfer Switch

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Engine

Generator

Speed Control

UtilitySupply

StandbyGenerator

BuildingLoad

GCB MCB

Single Gen, Single Utility Architecture

BuildingDist. System

Utility SupplyBreaker

Gen SupplyBreaker

(N/O) (N/C)

Soft Load Transfer Switch

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GCB MCB

Utility/PrimarySupply

Genset/BackupSupply Critical

Load

Mode:Gen

Status:UtilityStatus:

Normal OFF Energized. kW Varies.kW = FacilityLoad

GCB MCB

Standby Running.kW Varies.kW = Facility Load

Failed/Off.

SoftRe-TransferTo Utility

Running.Initial kW =Facility Load

Final kW=~10% Rated

Running.Initial kW= 0kW

Final kW=Facility Load

kW kW

Sequences of Operation – Softload Transfer Switch

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GCB MCB

Mode:Gen

Status:UtilityStatus:

BaseLoad Mode

Energized. kW Varies.kW = FacilityLoad in excessOf FixedGen kW

Running.kW Fixed.kW = Preset/Fixed(typically80-100%Genset Capacity)

Import(Export)Mode

kW

Level

Time

kW

Level

Time

kW

Level

Time

kW kW

kW

Energized. kW Fixed.kW = FixedImport orExportLevel (kW)

Running. kW Varies.kW = FacilityLoad in excessOf ImportSetpoint

GCB MCB

kW

Level

Time

kW

Level

Time

kW

Level

Time

kW kW

kW

BaseloadSetpoint

ImportSetpoint

Sequences of Operation – Softload Transfer Switch

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G E N E R A T O R U T I L I T Y

G W 4G C P

G 3 0

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 Switches

Safety Lockout/86 Relay

LED Status Annunciation

Control Panel – Softload Transfer Switch

LAN/WAN

Local Monitoring and email Alarm transmission via:

Enervista Viewpoint Monitoring ™

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Engine Generator

3 CT’sV (PT’S)

V (PT’S)3 CT’S

UtilitySupply

CriticalLoad

Closed Transition ATS or 5-cycle CB’s

GE Multilin G30 Relay

GCB MCB

Meter #1:Generator

SourceMetering

(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 Metering

Meter #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 Aggregator™

1

2

3

Setup Utility billing structure

Setup custom site bills (showing usage or savings)

Enter Begin & End dates & create/ view bills

Export reports for printing, sending, or filing

4

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Local & Remote Access to Reports

Site Level Site Peak Shaving Control Systems w/

local GE Enervista Viewpoint™

Unlimited # Sites

LEVEL 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)

G E N E R A T O R U T I L I T Y

G W 4G C P

G 3 0

GE Zenith ZTSSL

LAN or VPN

Up to~ 100 Sites

per Aggregator

Est. (6) REA’s for full 630-site configuration

…

Web Serv

er

Local data-logging by Multilin G30’s

Upload Data-Logs

“Aggregates”, or combines date from from the (6) REA servers.

View reports from EEA.

G E N E R A T O R U T I L I T Y

G W 4G C P

G 3 0

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).

Type 2 – Multiple Genset Standby

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Genset #1

ATS

Genset #2 Genset #3

Paralleling Bus

Multiple Genset Standby

Typical Architecture

Primary Distribution

Secondary Distribution

EmergencyPanelboard

Exit

Emergency Loads

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Genset #1

ATS

Genset #2

Typical Sequence of Operation for PSG – On loss of Utility

1 Utility Supply Fails

2 ATS Send start signal to all Gens

3 All Gens start. PSG control system monitors. 1st Gen at rated Volts & Freq is connected to the Paralleling Bus.

Paralleling Bus

5PSG Controls synchronize 2nd and 3rd Gensets to Bus (speed and volts bias to Gen Gov & AVR), and close CB’s at point of synchonism (see above).

6 PSG 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.

7

X Synchronous Conditions

1 1) Volts within

+/- 10%

1

2) Phase within +/- 20 Deg

2

PSG Controls shed low priority ATS if Gens are overloaded. PSG permits manual or auto re-connect.

8

Priority 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 Utility

1 Utility Supply Returns

2 ATS’s retransfer loads to Utility, after preset time delays, and remote start commands.

3 When last ATS removes start command, PSG Controls open all Gen CB’s

4 PSG controls hold start signal to all Gens to permit cooldown at no load.

5 After cooldown timer expires, PSG controls remove start signals to Gensets.

6 Gensets shut down and remain ready for next utility outage.

Genset #1

ATS

Genset #2

Paralleling Bus

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Typical GE Zenith Configuration

Other key items (inside)

1. GE Fanuc PLC (Single or Redundant)

2. Flexible Woodward SPMA (sync) and LSM (load Sharing) modules

3. Hardwired backup switches for load add/shed

4. Backup 24 VDC power supply for system ride-thru on DC control power problems• Highly visible, LED Annunciation for instant viewing and viewing

from distance• Full 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

stability• Generator Protective Relay (typically Utility grade for MV, Industrial

grade for LV)

• Totalizing Power Quality Meter (PQM) with waveform & diagnostic capability

• Simple Operator Interface Panel (OIP) for setup of time delays, load add/shed, etc.

Key Items – GE Recommendation

Type 3 – Utility Paralleling, Peak Shaving

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GensetBreakers

Utility Supply

Utility Paralleling, Peak Shaving

Facility Loads

Feeder Breakers

Typical Architecture

1. Generators sized to high% of total facility loads

2. Utility CB and Gen CB’s act as a “Transfer Switch”, switching 2 sources of power to main bus in event of Utility outage.

3. Re-transfer to utility either Open or Closed Transition (typically closed)

4. Main bus is fed from 2 sources power – utility supply (primary) and generator supply (backup)

5. Bus AIC/Short circuit rating sized to capacity of utility + all Gensets.

Main

Bu

s

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Utility Paralleling - Base Loading

GCB

Utility Supply

Load k

W

Level

Time

Gen

kW

Le

vel

Time

Uti

lity

kW

Level

Time

kW

kW

kW

BaseloadSetpoint

GCB

kW

Genset Base Load:1 Utility Supply Available

2 When 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 CB’s.

3 PSG system controls kW on Gensets to fixed, base load level.

4 As system load varies, Utility supply kW varies to supply the load.

5 When Gen supply no longer needed, PSG Controls slowly ramp load back to utility supply and open Gen CB;s at near no-load.

5 PSG controls cooldown and shutdown Gensets.

kW

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Utility Paralleling - Import/Export

GCB

MCB

Load k

W

Level

Time

Gen

kW

Le

vel

Time

Uti

lity

kW

Level

Time

kW

kW

kW

BaseloadSetpoint

GCB

kW

Utility Import/Export:1 Utility Supply Available

2 When 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 CB’s.

3 PSG system controls kW on Gensets to maintain fixed kW value on Utility supply (import or export).

4 As system load varies, Genset supply kW varies to supply the load.

5 When Gen supply no longer needed, PSG Controls slowly ramp load back to utility supply and open Gen CB;s at near no-load.

5 PSG controls cooldown and shutdown Gensets.

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Typical GE Zenith Configuration

Other key items (inside)

1. GE Fanuc PLC (Single or Redundant)

2. Flexible Woodward SPMA (sync) and LSM (load Sharing) modules

3. Hardwired backup switches for load add/shed

4. Backup 24 VDC power supply for system ride-thru on DC control power problems• Highly visible, LED Annunciation for instant viewing and viewing

from distance• Full 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 CB• Generator Analog Metering for best viewing of Gen & Utility

stability• Generator Protective Relay (Utility grade)• Totalizing Power Quality Meter (PQM) with waveform & diagnostic

capability• Industrial Computer with graphical 1-lines, load controls,

trending, alarm management.

Key Items – GE Recommendation

Type 4 – Mission Critical Standby

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Mission Critical Standby

Typical Architecture – Tier 4 Data Center

System ‘A’ Gen Bus

System ‘B’ Gen Bus

System ‘A’ Utility Bus

Unit Subs

Util A Gen A

Unit Subs

Gen B Util B

Unit SubsUtil A Gen B

Unit Subs

Gen A Util B

System ‘B’ Utility Bus

1. Complete system redundancy – Tier 4 classification2. 100% Backup Generator N+1 capacity3. 2 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 Configuration

• Full Manual backup, visible LEDs, Utility Grade relaying, PQ Metering

• Synchronized-backup PLC each Gen System (2 x PLC each Gen system)

• Gen System Graphical Display, + large monitor each system for display downstream load status

• Each System Master control capable backup of other system

Key Items – GE Recommendation

Gen ‘A’ Gen ‘B’

Util ‘B’Util ‘A

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ZDEC 2020