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Product leaflet

Live tank circuit breaker LTB 72.5 - 420 kV World's most versatile circuit breaker

LTB is suitable for breaking currents upto 50 kA, fast interruption for maximum power system stability. It is configurable for most applications and environments.

Design features LTB is a high-performance circuit breaker with high breaking current and excellent current-carrying design. LTB D is designed for a maximum breaking current of up to 40 kA at rated voltages from 72.5 kV up to 170 kV, continuous current 3150 A. LTB E is designed for a maximum breaking current of up to 50 kA at rated voltages from 72.5 kV up to 420 kV, continuous current 4000 A. LTB is available for single- or three-pole operation. For circuit breakers with one breaking element per pole, both modes of operation are possible. For two-chamber circuit breakers only single-pole operation applies. Applications LTB is suitable for most applications and proven in extreme locations including deserts, the tropics and cold climateswithstanding natural disasters from hurricanes to major earthquakes. High altitude applications High seismic requirement applications Line, transformer, reactor and capacitor switching Low frequency railway applications Connecting renewable power to the grid

Controlled switching by SwitchsyncTM The single-pole operated live tank circuit breakers supplied by ABB are particularly well suited for controlled switching due to their good stability in regards to mechanical operating time and dynamic dielectric behavior. Controlled switching is used for elimination of harmful electrical transients upon planned switching of mainly capacitor banks, shunt reactors and power transformers. The method is also gaining acceptance for reenergizing of EHV transmission lines, and replacing traditional pre-insertion resistors. Reliable operating mechanism For many years, ABB has used operating mechanisms with energy mechanically stored in springs. This solution offers considerable advantages in that the energy in the tensioned springs is always available. BLK is used for: LTB D1/B 72.5 - 170 kV LTB E 72.5 - 245 kV singe-pole operation FSA1 is used for: LTB D1/B 72.5 - 170 kV BLG is used for: LTB E 72.5 - 245 kV three-pole operation LTB E 420 kV single-pole operation MSD is used for: LTB D1/B 72.5 - 170 kV LTB E 72.5 - 245 kV single pole operation

Technical data - LTB LTB 72.5D1/B

LTB 145D1/B

LTB 170D1/B

LTB 72.5E1

LTB 170E1

LTB 245E1

LTB 420E2

Number of breaks per pole

kV

1

1

1

1

1

1

2

Rated voltage

kV

72.5

145

170

72.5

170

245

420

Rated frequency

Hz

50/60

50/60

50/60

50/60

50/60

50/60

50/60

Rated normal current

A

3150

3150

4000

4000

4000

4000

Making current peak

kA (peak)

100/104

100/104

125/104

125/104

125/104

125/104 50/40

3150 100/104

kA (rms)

40

40

40

50/40

50/40

50/40

Power frequency withstand voltage

To earth and between phases

kV (rms)

160

275

325

160

325

460

660

Across open pole

kV (rms)

275

275+70

325

325

325

460+145

510+210

Lightning impulse withstand level (LIWL)

To earth and between phases

kV

350

650

750

350

750

1050

1425

Across open pole

kV

650

650+70

750

750

750

1050+200

1425+240

Switching impulse withstand level (SIWL)

To earth and between phases

kV

1050

Across open pole

kV

900+345

Rated s.c breaking current with duration time 3 s

First-pole-to-clear factor

1.5

1.5

Rated operating sequence

1.5

1.5

1.5

1.3

1.5

O-0.3 s-CO-3 min-CO

1YVA000011-Rev.A, en 2016-04

Other values on request

Drawing - LTB

Voltage Operation

Copyright 2016 ABB. All rights reserved.

Units

LTB D 72.5 - 170

LTB D 72.5 - 170

LTB D 72.5 - 170

LTB E 72.5 - 245

LTB E 245

LTB E 420

Three-pole operation

Three-pole operation

Single-pole operation

Three-pole operation

Single-pole operation

Single-pole operation

BLK

MSD/FSA

BLK/MSD/FSA

BLG

BLK/MSD

BLG

Mechanism

For more information please contact: ABB High Voltage Switchgear Co. Ltd. Beijing No. 12 Jingyuan Street Beijing Economic-Technological Development Area Beijing, 100176 P.R. China Tel: +86 10 6781 8000 Fax: +86 10 6781 8006 www.abb.com.cn

Note: We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB does not accept any responsibility whatsoever for potential errors or possible lack of information in this document We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its content - in whole or in parts - is forbidden without ABB's prior written consent.