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Rated voltage 123-170 kV

Rated current 3150 A

Rated breaking current 40 kA

Installation Outdoor/Indoor

Switching Module

LTB Compact

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Benefits Due to...

High availability... ... no or few traditional disconnectors required.

... fast, easy replacement of the circuit breaker unit.

... optional condition monitoring.

Lower maintenance cost..... ... predictive maintenance via optional condition monitoring and self

diagnostics.

... maintenance free fixed contacts.

Reduced space requirement.... ... no or few traditional disconnectors required.

... optional compact design including integrated instrument transformers.

Enhanced safety... ... reduced maintenance work in the switchyard.

Short installation time... ... pre-fabricated and pre-tested Switchgear Modules.

... reduced civil work and less switchyard material

Main features and advantages

The main advantage with a trolley

mounted circuit breaker is that the

disconnector function is achieved by the

moving of the complete breaker unit. Thus,

the conventional disconnectors are replaced by

a maintenance free disconnector function with

fixed contacts.

The circuit breaker can also be withdrawn for

service or replaced with a spare unit in a short

time.

Cost savings compared to traditional design isdue to less foundations, steel structures and

space requirements. Use of less connectors and

insulators, smaller earthing grid and fibre optics

replacing signal cables will also lower installation

costs.

Condition monitoring enables maintenance when

needed instead of timebased maintenance.

For more detailed informationThis pamphlet includes general information about the

Switching Module - LTB Compact. If more detailed tech-

nical information for the individual components included

in the LTB Compact (e.g. LTB circuit breaker, BLK

operating mechanism, etc.) is required, please contact

ABB Power Technology Products AB.

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ABB Power Technology Products AB

High Voltage ProductsSE-771 80 LUDVIKA, SwedenTel +46 240 78 20 00Fax +46 240 78 36 50Internet:www.abb.com

CataloguePubl.PTHVP/MD

4028en

Edition4,

2001-01

ProdoucedbyHVP/MD

AO

Technical Data for LTB 123-170 Compact

Rated voltage (IEC, ANSI) 121/123 145 169/170 kV

Power frequency withstand voltage1 min dry(IEC) 230 275 325 kV1 min wet (IEC) 230 275 325 kV1 min dry (ANSI) 260 310 365 kV10 sec wet (ANSI) 230 275 315 kV

Disconnector functionImpulse voltage 1.2/50 s across open pole (IEC) 630 750 860 kVPower frequency withstand voltageacross open pole (IEC) 265 315 375 kV

Lightning impulse withstand voltage, (LIWL), (IEC) 550 650 750 kVFull wave 1.2/50s (ANSI) 550 650 750 kVChopped wave 2 s (ANSI) 710 838 968 kVChopped wave 3 s (ANSI) 632 748 862 kV

Phase distance 1500 1750 2000 mm

Creepage distance to earth 1) 2)

Normal 4015 4015 5045 mm

Long 4585 4585 5790 mmCreepage distance across break 1) 2)

Normal 3800 3800 4887 mmLong 4335 4335 5550 mm

Rated normal current 3150 A

Rated breaking current 31.5/40 kA

First pole to clear factor 1.5

Making current/peak (IEC) 79/100 kAMaking current/peak (ANSI) 85/108 kA

Duration of short circuit 3 s

Closing time 40 msOpening time 20 msTotal break time 40 msDead time 300 ms

Rated reclosing time, 50 Hz (ANSI) 20 cycles

Rated operating sequence, (IEC, ANSI) O-0,3 sec-CO-3 min-CO

CO-15 sec-CO

Values complying with IEC 56 (50 Hz and 60 Hz) and ANSI C37 (60 Hz)1) Other values on request2) Tolerances according to IEC 233.