FECA Meeting June 11th, · PDF fileFECA Meeting June 11th, 2012 Scott Ware [email protected]....
Transcript of FECA Meeting June 11th, · PDF fileFECA Meeting June 11th, 2012 Scott Ware [email protected]....
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Improving Network Reliability with Improving Network Reliability with
ReclosersReclosers
FECA MeetingFECA Meeting
June 11th, 2012June 11th, 2012
ReclosersReclosers
Scott Ware
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PreviewPreview
Reclosers are a fault interrupting devices that open and close into a faulted line in an attempt to restore power. Since the majority of faults are temporary, the use of reclosers can significantly improved the reliability of distribution networks. Most modern reclosers are controlled with electronic relays which give a great deal of flexibility in give a great deal of flexibility in protection, restoration, and communication. The presentation session will cover
1. Recloser basics2. The benefits of reclosing / reclosers3. The application of reclosers4. Automating multiple reclosers
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The Need for ProtectionThe Need for Protection
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RecloserRecloser
In electric power distribution, a recloser, or autorecloser, is a circuit breaker equipped with a mechanism that can automatically close the breaker after it has been opened due to a fault.[1][2] Reclosers are used on overhead distribution systems to detect and interrupt distribution systems to detect and interrupt momentary faults. Since many short-circuits on overhead lines clear themselves, a recloserimproves service continuity by automatically restoring power to the line after a momentary fault.
-- WikipediaWikipedia
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Basic Components of a Basic Components of a
RecloserRecloser
Interrupter
Current ActuatorActuator
Current Sensor
Relay / Control
ActuatorActuator
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Interrupter Module DetailsInterrupter Module Details
Features
� Vacuum bottle for interruption
� Solid dielectric insulation
� Integrated CT
� Integrated Voltage Sensors
� Magnetic actuator
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Operation OptionsOperation Options
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Single Phase Operation Three Phase Operation
Single Phase
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Module Configuration OptionsModule Configuration Options
L – Modules
� Live Front Transformer Load Break Switch
� T-Body connections
C – Modules
� Dead Front Vault Application
� Front Access Dead Front Pad Mounted Switchgear
Z – Modules
� Dead Front Subsurface Application
� Front Access Dead Front Pad Mounted Switchgear
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Mounting OptionsMounting Options
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Major ManufacturersMajor Manufacturers
CooperCooper
ABB
G&W
Nulec
Noja
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Relay / ControlsRelay / Controls
� Brains vs. Brawn
� Takes input from CT’s (and voltage sensors) and makes decision to trip or not
� Electronic controls - Flexibility
� Advanced protection (directionality, under voltage…)
� Logic for more advanced applications
� Communication
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ProtectionProtection
�Different protection settings on different reclose
� Software settable
� Data recording
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Recent InnovationsRecent Innovations
6 Integral Voltage Sensing6 Integral Voltage Sensing6 Integral Voltage Sensing� Reduce clutter� Reduce weight
6 Integral Voltage Sensing� Reduce clutter� Reduce weight
True Mechanical Block� Additional safety
Pulseclosing� Electronic pulse instead of reclose� Theory - reduce system stress� Only 1 manufacturer
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Communication HardwiredCommunication Hardwired
� Most reliable media
� Cost / distance
� Types
� Copper over short � Copper over short distances
� Multimode fiber from 0-4km
� Single mode fiber from 0-30km or more
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� Economical over long distances
� Wireless channel not as reliable
� Types:
� Cell radio
Communication WirelessCommunication Wireless
� Licensed / unlicensed band radio
� Mesh radio
� Ethernet
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20%
13%
Installation
Maintenance
Site Ready Site Ready --Significant BenefitsSignificant Benefits
5%
20%
4%
38%
Disposal
AcquisitionCostsFreight
ProductDistribution
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What is reclosing and why do What is reclosing and why do you do it?you do it?
� Up to 95% of faults can be cleared during a 3-shot reclose cycle� Improvement in metrics
� SAIDI� SAIFI� MAIFI
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Reference Metric DefinitionsReference Metric Definitions
SAIDI – System Average Interruption Duration Index
SAIFI – System Average Interruption Frequency IndexIndex
MAIFI – Momentary Average Interruption Frequency Index
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RecloserRecloser vs. Switchesvs. Switches
� Cost
� Actuation
� Fault clearing and coordinationcoordination
� Reclosing into fault
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RecloserRecloser vs. Breakervs. Breaker
� Cost
� Self contained system
� Indoor vs. outdoor
� Physical size� Physical size
� Maintenance
� Frequency of operations
� Ratings
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Line Segmenting Line Segmenting EvolutionEvolution
Functionalit
y
Recloser
Automated Switch
Functionalit
y
Reliability Return on Investment
Manual Switch
Automated Sectionalizers
Automated Switch
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Typical Radial CircuitTypical Radial Circuit
Substation
Recloser
� Fuses on customer feeders� Reduce permanent faults by 95%� Disadvantage – all customer are out on permanent fault line fault
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Basic Application SchemesBasic Application Schemes
Fuse SavingFuse SavingDescription - Recloser is set to fast operate curve for one
or two attempts, saving the fuse if possible, and then operate on its slow operate curve on its last try to energize the line. Permanent fault downstream of fuse -the fuse will blow before the recloser trips for the final time, allowing power to be restored to the line not time, allowing power to be restored to the line not affected by the fault.
Positive - prevents longer outages due to a blown fuse caused by a temporary fault. Lower fuse costs.
Negative - may cause more temporary outages to more customers since everyone on the feeder is disconnected instead of just allowing the customers downstream of the fuse to be interrupted.
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Fuse
Saving Saving
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Description - Recloser will always use slow operating curve. If a fault occurs downstream of a fuse, the fuse will always blow before the recloser opens. Occurs for both temporary and permanent faults.
Positive - only those few customers downstream of the fuse are affected, and most of the customers on the feeder never see their power interrupted.
Basic Application SchemesBasic Application Schemes
Fuse BlowingFuse Blowing
power interrupted.
Negative - fuse needs to be replaced for all faults, even temporary ones, and the customers being fed through this fuse will be without power until the linemen can drive out to replace the fuse. If the fault was temporary all customers, including those downstream of the fuse, might have been restored after a brief interruption when the recloser opened, if a fuse saving scheme had been used instead of a fuse blowing scheme. Figure E-5 shows typical coordination curves that might be used for fuse saving.
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Fuse
Blowing
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Additional Additional ReclosersReclosers
Substation
Recloser
� Reduce outages by ½ � Additional reclosers will improve reliability � Diminishing returns
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Additional Additional RecloserRecloser PlacementPlacement
Substation
� Areas with more frequent outages� Key customers
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Single Phase Single Phase ReclosersReclosers
Substation
� Replacement for fuses� Long single phase lines
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Next Step Next Step –– Looped CircuitsLooped Circuits
Substation
� Second source� Faults can be isolated during repair� Automation
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AutomationAutomation
Switching Devices
Communication
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Intelligent Controls
Sensing
ProgramProgram LogicLogic
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� Cost of crew response
� Cost of lost energy sales
� Loss of Production costs for commercial and industrial customers
� Market retention costs for existing and new customers
Reliability CostsReliability Costs
customers
� Reliability-based penalties
� Performance Based Ratemaking (PBR) on SAIDI, SAIFI, and/or MAIFI
� Rate case decisions
� Lawsuits
� Advertising dollars needed to restore public image
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Customer Outage CostCustomer Outage Cost
Large C&I(> 1MW)
Small C&I(<1 MW)
Residential
Voltage sag $15,601 $203 $
1-2 seconds $23,097 $1,230 $5.84
1 minute $12,944 $543 $
Average Cost
1 minute $12,944 $543 $
15 minutes $18,245 $831 $
30 minutes $70,238 $2,367 $5.81
4 hour $119,715 $4,220 $7.14
8 hours $88,224 $7,361 $5.15
Average $70,634 $2,735 $6.59
Information from A Framework and Review of Customer Outage Costs: Integration and Analysis of Electric Utility Outage Cost Surveys (November 2003) – written by Leora Lawton, Michael Sullivan, Kent Van Liere, and Aaron Katz (Population Research Systems, LLC) for US Department of Energy
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Sample Calculation 1Sample Calculation 1
Based on outage cost only
Circuit – 7 reclosers
Manual switch - $5k each
Automated recloser system - $30k each
Total automated equipment premium – $175k ((30 –5) x 7)
Customers on half of circuit – 4 large C&I, 4 small C&I, 3000 residential
Outage 1-2 Seconds 1 Minute 30 Minutes 4 Hours
Total Cost $51,377 $38,476 $102,946 $165,155
Annual Return on Investment4 x (1-2 second outages) – 64%1 x (4 hour outage) – 90%
Payback Period4 x (1-2 second outages) – 1.6 years1 x (4 hour outage) – 1.1 years
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Sample Calculation 2Sample Calculation 2
Based on outage cost only
Circuit – 7 reclosers
Manual switch - $5k each
Automated recloser system - $30k each
Total automated equipment premium – $175k ((30 –5) x 7)
Customers on half of circuit – 4 large C&I
Outage 1-2 Seconds 1 Minute 30 Minutes 4 Hours
Total Cost $92,388 $51,776 $280,952 $478,860
Annual Return on Investment4 x (1-2 second outages) – 211%1 x (4 hour outage) – 274%
Payback Period4 x (1-2 second outages) – 0.5 years1 x (4 hour outage) – 0.4 years
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Advantages
Distributed TransferDistributed Transfer
Common Bus
Two or three separate recloserscommunicating to each other to perform voltage loss transfer.
�Cost
�Familiar hardware
�Spread out sourcesSplit Bus
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� Non-communicating loop scheme� Central control communication� Peer to peer communication
Open Loop Scheme Open Loop Scheme -- StandardStandard
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Open Loop Open Loop –– High SpeedHigh Speed
Substation 1
R1 R2 R3 R4 R5
� Peer to peer communication
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Substation 2
R11 R10 R9 R8 R7
R6
Communication
� Peer to peer communication� Close before open
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Closed Loop Closed Loop -- Single PhaseSingle Phase
Source 1
ViperST
ViperST
ViperST
ViperSTAdditional restoration
for residential loadsSource 2
Viper ST
ViperST
ViperST
for residential loads
�Two parallel sources �Peer to peer communication
� Communication assisted tripping
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Flexible Network Flexible Network SchemeScheme
Local Controller
Distributed Control
Advanced DMS Control
Data protocol
Peer to peer protocol
Automated switch or recloser
Distributed ATS
Individual ATS
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Take Take AwaysAways
� Reclosers improve reliability
� Three options for reclosers
� Three phase unit, three phase tripping
� Three phase unit, single phase tripping� Three phase unit, single phase tripping
� Single phase unit
� Apply near problem areas for most benefit
� Use automation to improve reliability further
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Thank YouThank You