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

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%

FunctionalIntegration

Encapsulation

partial full

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

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

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”

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

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

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.

Disconnecting Circuit BreakerFunctionality and product portfolio

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

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

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”

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

Interlocking functionsIncreased safety with highly reliable interlocking

Closed position

Disconnected position- locked in open position

Earthing switch

ClosedOpen

Open position

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

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

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

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

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

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

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!

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

DCB improving grid performance?Certainly!

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

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

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

Outage comparison due to maintenance

Single Object Single Transformer Parallel Objects

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

http://dcbsubstations.com

Maintenance exampleHow do we ensure the highest safetyand availability?

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

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

Maintenance ExampleSingle bus

How to minimize the impact on availability during maintenance

Disconnecting Link

Single bus

Open line and busbar adjacent breakers

Lock the breakers and close the motor operate earthing switch

Earthing very visible indicator that it is safe to enter substation

Yes, it is earthed! Now it is safe to enter the substation

Apply portable earthing switches

Slack the link

Energize busbar

Same procedure to connect the links after DCB maintenance

References

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

Swedish National GridDCB preference since 2000

“Same cost for a double breaker as a conventional double busbar”

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.

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

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

SummaryLow environmental impact switchgear

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

Direct Cost Savings

Land Acquisition

Land Preparation

Material savings

Busbar

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

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

David Olofsson, Territory Marketing Manager, PG … · Switchgear Solutions David Olofsson,...

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