David Olofsson, Territory Marketing Manager, PG … · Switchgear Solutions David Olofsson,...
Transcript of David Olofsson, Territory Marketing Manager, PG … · Switchgear Solutions David Olofsson,...
Switchgear Solutions David Olofsson, Territory Marketing Manager, PG Breakers & Modules 2012
Low environmental impact switchgear
© ABB Group May 3, 2012 | Slide 2
Why reduce the SF6 volume to a minimum?...
Under the Australian Government’s 23 dollars/ton carbon tax, a 145 kV SF6 breaker will cost 16 000 dollar more.. …that is approximately 25%
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FunctionalIntegration
Encapsulation
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ABB Switchgear portfolioIntroduction of Switchgear Solutions
DTB Circuit BreakerCurrent Transformer
Hybrid ModulesCircuit BreakerCurrent TransformerVoltage TransformerDisconnectorEarthing Switch
GISCircuit BreakerCurrent TransformerVoltage TransformerDisconnectorEarthing SwitchBusbar / Busducts
LTB Circuit Breaker
DCB Circuit BreakerDisconnectorEarthing Switch
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Breakers and Modules Outline
Why switchgear solutions?Disconnecting Circuit Breaker
Functionality and PortfolioLTA - Circuit Breaker with C02-gasHow will the DCB improve the network performanceImproved personnel safety – Maintenance exampleReferences
Summary
Outline
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Why switchgear solutions?Because it makes life E.A.S.Y!
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Why switchgear solutions?Because it makes life E.A.S.Y!
“Even if space is not a constraint, it is in
general a time consuming process
to apply for ”
Environment AVAILABILITY SAFETY YARD SIZE
“When we reduce maintenance to only once in 15 years, it
will definitely improve the safety “
“A high availability is our number one
priority”
“Minimizing the SF6 and substation
footprint will enable a lower environmental
impact”
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Why switchgear solutions? Evolution of single line configuration
Oil Minimum SF6 GasAir Blast
No extra contacts for disconnecting function
Encapsulation of disconnectors & current
transformers
Why switchgear solutions? Lowest maintenance and failure rates
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Failu
re a
nd m
aint
enan
ce ra
te
1960 Today
Bulk oil CB
Air blast CB~1 yr
Minimum oil CB~5 yr
SF6 CB~15 yr
Open air disconnector, ~5 yr
Switchgear solutions reduce the maintenance interval from 5 to >15 years due to the removal of open air disconnectors
DCB, 15th year
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Double busbar introduced due to disconnector maintenance
Why switchgear solutions? Availability impact of open air disconnectors
Yesterdays standard solutions
Why switchgear solutions? Availability impact without open air disconnectors
Today's standard solutions
Taking away the DS totally, there is no service and no risk for failure.
DCB
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Disconnecting Circuit BreakerFunctionality and product portfolio
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Failure of a disconnector in a major 400 kV S/S
Black-out of major part of Sweden
Main load centers
Historical grid development 1983 - a milestone for DCB
Main hydro generating
plants
20 000 MW load disconnected 5 million people affected
6 hours outage time
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LTB145 DCB Breaking function
Identical as conventional circuit breaker
The same breaking chamber and operating mechanism as a conventional circuit breaker
Same high reliability as for a standard circuit breaker
DCB fundamentalsOnly one set of moving contacts
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DCB fundamentalsOnly one set of moving contacts
LTB145 DCB Disconnecting function
The disconnection function for a DCB is obtained between the circuit breaker contact set.
“What we don’t have can not fail nor require maintenance”
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DCB fundamentalsMaximum security with motor operated earthing switch
Motor operated earthing switchRemote operated from control room
A very visible indication for the safety
Can be padlocked
Maximum safety for maintenance personnel
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Interlocking functionsIncreased safety with highly reliable interlocking
Closed position
Disconnected position- locked in open position
Earthing switch
ClosedOpen
Open position
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Interlocking functionsBlocking of circuit breaker function
DCB in open position
Remotely operated locking bar
Can only be operated when DCB is in open position
Can be padlocked
Unblocked
Blocked
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Interlocking functionsEarthing switch
Disconnected position- locked in open position
Earthing switch
ClosedOpen
Remote operated from control room
Can only be operated when DCB is blocked
Can be padlocked
LINK
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The DCB familyFor a simplified substation
Type DCB LTB 72.5D1/B
DCB LTB 145D1/B
DCBHPL 170-300B1
DCBHPL 362-550B2
Rated voltage 72.5 kV 145 kV 170 - 300 kV 362 -550 kV
Rated current 3150 A 3150 A 4000 A 4000 A
Breaking capacity 40 kA 40 kA 50 kA 63 kA
ABB provides DCB at all voltage levels and ratings
LINK
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IEC Standard for Disconnecting Circuit BreakersIEC 62271-108
DCB fulfils requirements for a circuit breaker and a disconnector
The standard describes how to test, interlock and block a Disconnecting Circuit Breaker
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LTA – Circuit Breaker with CO2 gas Test installation and portfolio
145 kV circuit breaker with CO2-gasPre-study
Field installation in Ulricehamn sinceMarch 2010 for a capacitor bank application
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Main characteristics
Rated voltage 145 kV
Rated short-circuit current 31.5 kA
Rated current 3150 A
Ambient temperature -50 C
Tested according to IEC
Composite insulators
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New LTB & DCB with CO2-gas LTA 72D1
ABB developing non-SF6 portfoliosLTB & DCB using CO2 instead of SF6
Developed from ABB’s highly efficient SF6interrupter technology
Common components with SF6 portfolioMSD1 mechanical spring driveInsulators, linkages, structure, castings
SF6 portfolios will remain for many years for the highest ratings
LTA 72 Disconnecting Circuit Breaker with CO2-gas Technical data
Similar ratings as a conventional SF6 circuit breaker!
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Main characteristics
Rated voltage 72.5 kV
Breaking current 31.5 kA
Continuous current 2750 A
Ambient temperature -50 C to +50 C
Operation Three-pole
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DCB improving grid performance?Certainly!
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Substation Design ExampleConventional 145 kV single busbar
Busbar disconnector maintenance will cause outage of substation (> 8 hrs every 5th year)
2 line bays
2 transformer bays
24 m x 43 m = 1032 m2
6 disconnectors to maintain ~5th year
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Substation Design ExampleDCB 145 kV single busbar
Busbar only affected of DCB maintenance (2 hour outage every 15th year )
2 line bays
2 transformer bays
18 m x 22 m = 396 m2
4 Disconnecting links
Removal of 6 disconnectors
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Substation Design ExampleDCB 145 kV single busbar
DCB + CT on one support structure
Line Entrance Module, VT and SA on one support structure
Busbar motor operated earthing and VT on one support structure.
Disconnecting link
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Substation Design ExampleDCB 145 kV single busbar
Outage comparison due to maintenance
Single Object Single Transformer Parallel Objects
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Substation Design ExampleDCB 145 kV single busbar
Outage comparison due to maintenance
Single Object Single Transformer Parallel Objects
Space comparison
61 % Space reduction with same layout
Dcbsubstations.comA tool to design and compare substations
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http://dcbsubstations.com
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Maintenance exampleHow do we ensure the highest safetyand availability?
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A removable link, with bolted connection, prepared to be opened quickly
Highly reliable switching arrangementsDisconnecting Link – reconnection example 420 kV
In less than one hour the DCB can be disconnected from the system
1h to remove the link
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Conductor is brought in place
Surfaces are cleaned and greased
Tighten up the bolts
Highly reliable switching arrangementsDisconnecting Link – reconnection example 420 kV
1h to put it back
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Maintenance ExampleSingle bus
How to minimize the impact on availability during maintenance
Disconnecting Link
Single bus
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Maintenance ExampleSingle bus
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Maintenance ExampleSingle bus
Open line and busbar adjacent breakers
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Maintenance ExampleSingle bus
Lock the breakers and close the motor operate earthing switch
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Maintenance ExampleSingle bus
Earthing very visible indicator that it is safe to enter substation
Yes, it is earthed! Now it is safe to enter the substation
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Maintenance ExampleSingle bus
Apply portable earthing switches
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Maintenance ExampleSingle bus
Slack the link
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Maintenance ExampleSingle bus
Energize busbar
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Maintenance ExampleSingle bus
Same procedure to connect the links after DCB maintenance
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References
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Worldwide references DCBMore than 1100 units in 30 countries
Argentina AustraliaBelgium
BrazilCanada
DenmarkEstoniaFinland
GermanyHungaryIceland
IranKazakhstan
LithuaniaMexico
New ZealandNigeria
NicaraguaNorwayOman
RomaniaSudan
South AfricaSwedenUganda
UKSpainRussiaChina USA
Poland
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Swedish National GridDCB preference since 2000
“Same cost for a double breaker as a conventional double busbar”
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New ZealandABB preferred DCB supplier to Transpower
From Transpower TechnicalSpecification, 145 kV:
Transpowers main reason for putting in DCBs is to:(a) maximise circuit availability,(b) minimising components that need maintenance and(c) increase the maintenance intervals requiring outages from 4 years to 12 years.
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Rio Tinto DCB substations Why did Rio choose DCB as there preferred solution?
Benefits
Maintenance savings
Availability, Outage costs >1 MAUD/day
Reliability: Fewer apparatuses in substation
Safety: used hand operated disconnectors in the past.
IEC 61850 compliant substation
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Indoor DCB SubstationA cost competitive solution for 72, 145 kV
Advantages
Cost competitive solution for urban areas
Alternative to GIS
Designed for harsh environmental conditions
Small total SF6 gas volume
132 kV DCB indoor substation,
Kiruna Sweden
LINK
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SummaryLow environmental impact switchgear
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InterruptersSummary low environmental impact switchgear DCB will certainly improve personnel safety
Minimum need for maintenance will give fewer hours in the SS hence safer
Easy to understand the S/S layout
Fewer apparatus will make life easier
Less testing at site
Less time needed in the S/S makes it safer
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Direct Cost Savings
Land Acquisition
Land Preparation
Material savings
Busbar
Fence
Cabling
Support structures
Simplified layout
Less Engineering
Faster Delivery time
Faster Installation and Commissioning time
Summary low environmental impact switchgear DCB will certainly lower the direct costs
DCB gives a lower CAPEX
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Indirect Cost Savings
Increased availability:
Decreased cost for maintenance
Decreased cost and power outage
Increased revenues when the line can be in service
Reduced energy losses in the substation
Summary Switchgear SolutionsDCB will certainly lower the lifecycle costs
DCB gives a lower OPEX
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