Outdoor live tank SF6 circuit breaker

Model LTB E with Auto-Puffer TM, 245 to 550 kV

2 ABB

Advantage ABB

ü 120 years of technology and innovation

ü Unparalleled domain competence

ü Vast global experience

ü Total solution provider

ü Large installed base

ü Environment-friendly technologies

ABB (www.abb.com) is a global leader in power andautomation technologies that enable utility andindustry customers to improve performance whilelowering environmental impact. The ABB Group ofcompanies operates in around 100 countries.

ABB’s Power Technologies division offers electric,gas and water utilities as well as industrial andcommercial customers a wide range of products,system and services for power generation,transmission and distribution. ABB’s turnkeysolution capabilities in the sector range frombulk power transmission, substations andcomplete electrification to utility automationand distribution systems.

ABB - a global leader

The product offering covers a wide spectrum oftechnologies across the entire voltage rangeincluding indoor and outdoor circuit breakers, airand gas insulated switchgear, disconnectors,capacitor banks and reactive power compensators,power and distribution transformers as well asinstrument transformers.

ABB in India has a long-standing presence overseveral decades. The company has extensive localmanufacturing across 8 centres supported by acountrywide marketing presence, including 26marketing offices and a network of around 500channel partners. The operation also has 8 servicecentres in addition to customer training hubs andglobal R & D centres.

ABB 3

LTB E – SF6 circuit breaker with Auto-Puffer TM foroutdoor installation

LTB E is an outdoor SF6 circuit breaker designed forsystem voltages in the range of 245 to 550 kV andfor rated short-circuit currents up to 50 kA. Thedesign incorporates an advanced Auto-PufferTM

interrupter based on the latest developments in arctechnology and dielectrics.

The energy required for interrupting short circuitcurrents is partly drawn from the arc itself, therebyreducing the energy required for the operatingmechanism by more than 50 percent as comparedwith a conventional SF6 puffer type circuit breaker.

The low energy requirements result in a designoptimised for low operating forces which in turnresults in higher reliability.

All single pole operated circuit breakers areequipped with one operating mechanism per pole.Circuit breakers with one breaking unit per polecan be operated with one operating mechanismper breaker.

The LTB E circuit breaker complies with theinternational standards IEC and ANSI.

n Restrike-free interruption of capacitive currentsdue to optimised ‘contact’ design andmovement

n Optimum quenching at zero current ensureslow over-voltages during switching ofinductive currents

n Protection from gas leakage by double X-ringsin dynamic seals and double O-rings in staticseals, tested in varying climatic conditions over30 years of field operations. (SF6 gas loss lowerthan 1 percent / year.)

n Minimal maintenance and high reliability from:– separate current paths for continuous and

arcing currents– components optimised to withstand

electrical and mechanical stresses

Key features and advantages

n Optimised contact gap ensures high dielectricstrength even when the SF6 gas in the pole isat atmospheric pressure

n Low noise level due to low mechanical energyrequired for operation

n Pre-tested, pre-assembled units for easyinstallation

n Optimised pole and structure for high seismic‘withstand’ capability

n Synchronised switching with SwitchsyncTM

relay (optional)

n Supervisory control with condition monitoringequipment SwitchguardTM / SwitchcontrolTM

(optional)

DesignThe breaker pole constitutes a sealed unit, whichincludes one or two breaking unit(s), support andoperating insulators, as well as pole linkage housingwith tripping spring attachment. A filter forabsorbing moisture maintains quality of SF6 gas.

Operating mechanismThe circuit breaker is operated by a motor chargedspring operating mechanism, which is installed incompact splash-proof and corrosion resistanthousing.

n Three BLK 222 mechanisms are used for singlepole operation at 245 kV

n One BLG 1002A mechanism is used for threepole operation at 245 kV

n Three BLG 1002A mechanisms are used forsingle-pole operation at 420 kV

Testing and Quality Assurancen The circuit breakers are type tested as per

IEC standards

n For each circuit breaker

– Routine tests performed as per requiredIEC or ANSI standards

– Mechanical endurance tests performed for10,000 operations

– Routine test reports issued showing actualtest results

n The manufacturing facility is ISO 9001 certified,covering all aspects of production and testing toensure the highest quality standards

n The manufacturing facility is also EHS certifiedfor Environment and Occupational Health andSafety Management Systems (OHSMS)

Transportation and erectionn The LTB E circuit breaker poles are

transported as complete units filled with SF6

gas to a slight overpressure. Circuit breakerpoles with two breaking units per phase aresupplied as two separate units: breaker-headand support insulator

n Erection work at site can be done within a day

n SF6 gas should be filled to specified workingpressure by the following equipment:– One special control valve for connection to

the SF6 gas bottle and a gas-filled hosewith connectors

n Gas filling can be done without SF6 gas beingreleased into the atmosphere. No gas treatmentis necessary before gas filling

4 ABB

Technical Data

Values complying with IEC 62271-100 and ANSI C37, other values on request.

LTB245E1 420E2 420E2 550E2

Number of breaks per pole 1 2 2 2Rated voltage kV 245 362 420 550

Power frequency withstand voltage (1 min):– To earth kV 460 520 520 620– Across open pole kV 460 450 610 800

Lightning Impulse Withstand Level (LIWL):– To earth kV 1050 1175 1425 1550– Across open pole kV 1050 1175(+205) 1425(+240) 1550(+315)

Switching Impulse Withstand Level (SIWL):– To earth kV – 950 1050 1175– Across open pole kV – 800(+295) 900(+345) 900(+450)

Minimum creepage distance mm/kV 25 25 25 25

Rated normal current A 4000 4000 4000 4000Rated breaking current kA 40 50 50 50First pole to clear factor 1.3 1.3 1.3 1.3Making current / peak kA 100 125 125 125Duration of short-circuit s 3 3 3 3

Closing time ms 40 70 70 70Opening time ms 17±2 18±2 18±2 18±2Total break time ms 40 40 40 40Dead time ms 300 300 300 300

Rated operating sequence O - 0.3 sec - CO - 3 min - COAlt: CO - 15 sec - CO

Dimensions

LTB 245E11-pole operation with BLK 222

Data and illustrations without engagement. We reserve the right to make changes in the course of technical developments.

LTB 420 - 550E21-pole operation with BLG 1002A

ABB 5

All dimensions in mm

LTB 245E13-pole operation with BLG 1002A

Circuit breaker F G H J

Type LTB 420E2 3105 1914 4882 6541

Type LTB 550E2 4135 1914 4882 7571

ABB LimitedHigh Voltage ProductsManeja, Vadodara390 013, IndiaTel: +91 265 2642141Fax: +91 265 2638918Email:ltb.marketing@in.abb.com

Regional Marketing Offices:

NBCC Tower4th FloorNo. 15, Bhikaji Cama PlaceNew Delhi 110 066Tel: +91 11 26186000Fax: +91 11 26197592/84035

4th FloorNo. 9Elgin RoadKolkata 700 020Tel: +91 33 22832911/906Fax: +91 33 22832990

ABB HouseDr. S B PathBallard EstateMumbai 400 038Tel: +91 22 56318231 – 39Fax: +91 22 56318276/77

Embassy Star, 1st FloorNo. 8, Palace RoadVasanth NagarBangalore 560 052Tel: +91 80 22949779Fax: +91 80 22949808

Century PlazaNo. 3C, 3D, 3F, 3rd Floor561 / 562, Anna SalaiTeynampetChennai 600 018Tel: +91 44 24340201/203Fax: +91 44 24340282

Vandana House1st FloorG E Road, RamkundRaipur 492 001Tel: +91 771 5060816-8Fax: +91 771 5023051www.abb.co.in

North

East

West South

Central

1HY

B80

0001

-048

Rev

. B