Post on 21-Apr-2015
Cummins Power Generation
P T i i M d l 7Power Training Module 7
Generator Sizing
Bob PatrickOctober 2008
Sizing the Genset for Motors….
Two Factors – must have1 Available additional engine torque to support both1. Available additional engine torque to support both
the existing load plus accelerate the motor up to full speed within the spec limits.p p(Acceleration Torque = advised Nm x rpm x 2π/60 = watts)
2 Alt t bilit t th t i h2. Alternator capability to overcome the motor inrush and sustain the voltage within the spec limits.
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DOL Starters
REN
T
600Current
Power Factor
Direct On-Line (DOL) Start
High Locked Rotor Current (kVA) POW
ER
, CU
RR
1.0
R (L
AG
GIN
G)
g ( )
Shown for 100% Rated VoltageN
T TO
RQ
UE,
P
OW
ER F
ACTO
R
Starting PF 0.2 to 0.4 for 3 Ø Motors
Higher Starting Requirements
PER
CEN
100 0.2
PO
Motor Torque
3
g g q
PERCENT MOTOR RATED SPEED20 40 60 80 100
Load Torque0
Star-delta Starting…Typical kW demand of motor…
Reduced Starting ImpactReduced Starting Impact
Watch out for the transition (kVA)
Potential start failure if alternator cannot sustain voltage in transition. Typical kVA demand of motor…ca ot susta o tage t a s t o
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Soft Starting…
Motor Response for Soft Starter
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Regenerative Load
Reverse power needs to be considered.
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Regenerative LoadStage 1:-Stage 1:Genset Supplies Site Loads
Stage 2:-Lift M t P dLift Motor Produces Reverse Power 200kW
100kW Load Bank Removes Risk of Reverse Power
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Transients
Step Loading the Generator
•Apply Load in Increments
•Apply Large Motor Loads First
•Limit Voltage and Frequency dip
•Ultimately reduce genset size
Step Starting Sequence
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Step Starting Sequence
ISO 8528 - 5
ISO 8528 ifi d i d fISO 8528 specifies design and performance criteria of Reciprocating Internal Combustion (RIC) engine and an Alternating Current (AC)(RIC) engine and an Alternating Current (AC) generator when operating as a unit.
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Voltage Transients….ISO 8528-5 Transient Requirements
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Frequency Transients….ISO 8528-5 Transient Requirements
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Transients….ISO 8528-5 Performance Classes
Class G1
This applies to generating set applications where the connected loads are such that only basic parameters of voltage and frequency need to be specifiedvoltage and frequency need to be specified.
EXAMPLE General-purpose applications (lighting and other simple electrical loads)simple electrical loads).
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Transients….ISO 8528-5 Performance Classes
Class G2
This applies to generating set applications where its voltage characteristics are very similar to those for the commercial public utility electrical power system with which it operatespublic utility electrical power system with which it operates. When load changes occur, there may be temporary but acceptable deviations of voltage and frequency.
EXAMPLE Lighting systems, pumps, fans and hoists.
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Transients….ISO 8528-5 Performance Classes
An example of Class G2 voltage and frequency requirements:
Transient Frequency Dip </= 10%Frequency Recovery Time </= 5 SecsSteady State Voltage Deviation </= +/- 2.5%Transient Voltage Dip </= 20%Voltage Recovery Time </= 6 Secs
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Transients….ISO 8528-5 Performance Classes
Class G3
This applies to applications where the connected equipment makes severe demands on the stability and level of the frequency voltage and waveform characteristics of thefrequency, voltage and waveform characteristics of the electrical power supplied by the generating set.
EXAMPLE Telecommunications and thyristor-controlledEXAMPLE Telecommunications and thyristor-controlled loads. It should be remembered that both rectifier and thyristor-controlled loads may need special consideration with respect to their effect on generator-voltage waveform.
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p g g
Transients….ISO 8528-5 Performance Classes
Class G4
This applies to applications where the demands made on the stability and level of the frequency, voltage and waveform characteristics of the electrical power supplied by thecharacteristics of the electrical power supplied by the generating set are exceptionally severe.
EXAMPLE Data-processing equipment or computer systemsEXAMPLE Data-processing equipment or computer systems.
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Voltage Transients….
L k d R t C f
Locked Rotor Curve
Locked Rotor Curve for1400kVA alternator
Used to aid sizingg
Approx 14% dip at1000kVA (depends onvoltage)voltage)
Allow 0.5% Volts Dip forevery 1% Freq Dip
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Sizing….
Can be very simple – a simple addition with diversity, etc., or...y, ,More complex when considering difficult loads and load step sequencing.
Difficult loads: Electric motors, UPS, Lighting, Medical equipment
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Medical equipment
Power SuiteCummins Power Suite.lnk
Cummins Sizing Tool Gensize (To calculate your generator requirements)generator requirements)
Has a database using CPG product test dataHas a database using CPG product test data
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Power Suite Demonstration
Any Questions before we move onAny Questions before we move on
Bob Patrick
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Bob PatrickOctober 2008
GenSize™ UpdatePSG/P l TPSG/Proposals Team
Part IIb – Training….
Bob PatrickO t b 2008October 2008
Installing Power Suite Central UpdateInstall Power Suite 4.0 From CD
Auto update from central database,http://www.cumminspower.com/na/technical/powersuite/webcenter/
Central database replaces
PC running Power Suite V4 0
original database
Power Suite Central Library
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PC running Power Suite V4.0y& Update CD
Updates Via Internet
Auto-updates from central database,p ,http://www.cumminspower.com/na/technical/powersuite/webcenter/
Select: Updated files for Europe, Middle East and Africa.
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Updates Via InternetAuto Updates –GenSize™ for MSWindows
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Cummins Power Suite
Opening Screen: Create New Project
With Project highlightedClick on “Open”
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• The opening screen allows import previous or create new project
G i M i S S tti U Gensize Main Screen: Setting Up Project Parameters
Current Project ParametersCurrent Project Parameters
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• Expand New Project in left column
Gensize Main Screen: Setting Up Project Parameters
Shows current loadsand steps available
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G i M i S S tti U Gensize Main Screen: Setting Up Project Parameters
Click on “EditClick on Edit Project”
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• Once expanded right click on project and select “Edit Project”
Gensize Main Screen: Setting Up Gensize Main Screen: Setting Up Project Parameters
Select Parameters tab
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• Project parameters box will appear
Gensize Main Screen: Setting Up Project Parameters
Current Project Parameters
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• Set the required project parameters
Gensize Main Screen: Setting Up Project Parameters
Once complete, click “OK” to continue
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Gensize Main Screen: Creating Loads
Add lighting load by clicking
th b lbon the bulb
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• Select load type from toolbar
Gensize Main Screen: Creating Loads
Enter 100kW lighting loadg g
Click “Next” for more options
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• Example shows 3 phase 100 kW fluorescent lights
Gensize Main Screen: Creating Loads
Shows requirements for 100kW light load
Click “Finish” to complete load
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• Review Load Requirements
Gensize Main Screen: Creating Loads
Light load nowLight load now created
Whilst highlighted, the light load
tparameters appear
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• Lighting load appears in left pane
Gensize Main Screen: Creating Loads
Light Load can now be dragged in to step 1gg p
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• Apply load to desired load step
Gensize Main Screen: Creating Loads
Project can now be sized by clicking the
“Size Project ”
Step 1 showing Light Load
jbutton
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• Minimum Requirements For Sizing Project
Gensize Main Screen: Sizing ProjectGensize Main Screen: Sizing Project
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• Gensize calculating project requirements to find match
Reports: Recommended Generator Model
RecommendedModel
Project parameters Performance Vs Requirements
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R t R d d G t Reports: Recommended Generator Model
RecommendedModelModel
L d tPerformance Vs
Load parameters Requirements
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R t R d d G t Reports: Recommended Generator Model
RecommendedModel
G t C fiPerformance Vs
Model
Generator Config Requirements
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R t R d d G t Reports: Recommended Generator Model
Click for full genset report
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• Changing the report type
R t R d d G t Reports: Recommended Generator Model
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• Printable Genset Report
R t R d d G t Reports: Recommended Generator Model
Close Report
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R t R d d G t Reports: Recommended Generator Model
Switch to Table View
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Reports: Recommended Generator Reports: Recommended Generator Model
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• Table View Used For Cross Referencing Models
R t R d d G t Reports: Recommended Generator Model
Switch to library
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y
Central Library CD
Exit Library toExit Library to return Gensize
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• Shows recommended model and technical data
Gensize Main Screen: Adding Load Steps
To add single load step click here
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• Extra load steps can be added at any time
Gensize Main Screen: Adding Load Stepsp
Second Load Stepp
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G i M i S Addi L d Gensize Main Screen: Adding Load Steps
You can define the number of steps
required
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• There are 2 ways to add extra load steps
Gensize Main Screen: Adding Load Steps
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• Specify number of required load steps
Gensize Main Screen: Adding Load Steps
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• New loads can then be added to each step
Gensize Main Screen: Adding Load Steps
Here we will add 400HP motor400HP motor
Cli k “N t” fClick “Next” for more options
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• New loads can then be added to each step
Gensize Main Screen: Adding Load Steps
Click “Finish”
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G SGensize Main Screen: Adding Load Steps
New motor load added
Motor load dragged to ggStep 2
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• Adding the new load to Step 2
G SGensize Main Screen: Adding Load Steps
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• Sized generator with 2 load steps
G i M i S Ch Gensize Main Screen: Change Quantity
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• Quantities of each load can be changed
Gensize Main Screen: Change Quantity
Quantity changes to 2y g
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• Quantities of each load can be changed
G i M i S S i Gensize Main Screen: Saving Projects
Project can be saved at any time using
the File menu
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G i M i S S i Gensize Main Screen: Saving Projects
File Name
Directory
File Name
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• Default projects directory
Gensize Main Screen: Saving Projects
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• Check for confirmation before closing!
Workshop
Lighting LoadsGeneral LoadsGeneral LoadsUPS LoadsMotor LoadsMotor LoadsRound-Up
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LIGHTING LOADS
Power input
Lighting requirement
Type of load
Requirement for generator
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LIGHTING LOADS
Power factor requirements
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GENERAL LOADS
Power inputs
PowerPower requirements
Requirement for generator
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GENERAL LOADS
Both Start and run power factors must be entered
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UPS LOAD
UPS Output power
UPS requirement
UPS type
Requirement for generator
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UPS LOAD
UPS characteristics hi h i i lwhich are crittical.
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MOTOR LOADS
Motor shaft power
Motor requirement
Motor type
Requirement for generator
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MOTOR LOADS
Motor starting type
Motor starting characteristics
Motor r nningMotor running characteristics
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Thank you for your time
Any Questions
Bob Patrick
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Bob PatrickOctober 2008