ABB SF6 LTB 245E1 BLG 1002A User manual

Product Manual
1HSB435416-2 en Rev 1
LTB 245E1
BLG 1002A
3-pole operation

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ABB Switchgear AB
S-771 80 LUDVIKA
PRODUCT MANUAL PRODUCT DESCRIPTION
- Circuit-Breaker
PRODUCT DESCRIPTION
- Operating Mechanism
ASSEMBLY INSTRUCTIONS
CHECKLIST
OPERATING AND MAINTENANCE
INSTRUCTIONS
LUBRICANTS
MAINTENANCE INSTRUCTIONS
- Operating Mechanism
OVERHAUL INSTRUCTIONS
- Circuit-Breaker
SPARE PARTS
- Circuit-Breaker
SPARE PARTS
- Operating Mechanism

ABB Switchgear
SF6Circuit-Breaker LTB 245E1 with operating
mechanism BLG 1002A
3-pole operation
1HSB435455-2 enrev1
Product Description

The information in this document is subject to alteration without prior notice and should not be regar-
ded as an undertaking from ABB Switchgear AB. ABB Switchgear AB takes no responsibility for errors
that can occur in the documentation.
ABB Switchgear AB is not responsible for damage incurred due to the misuse of this document.
The document, or parts thereof, may not be reproduced or copied without prior permission from ABB
Switchgear AB. It may not either be imparted to third party or otherwise be used without authorisation.
Infringement hereof will be subject to action in accordance with applicable laws.
© ABB Switchgear AB
Article number: 1HSB435455-2 enrev1
Date: 2000-08-07

Product Description
1HSB435455-2 enrev1 i
LIST OF CONTENTS
1. Description.......................................................................... 1
1.1 Design of the circuit-breaker.......................................................... 1
1.2 The circuit-breaker’s gas system.................................................... 2
1.3 Operating mechanism..................................................................... 3
1.4 Standards........................................................................................ 3

Product Description Description
1HSB435455-2 enrev1 1
1. Description
High voltage circuit-breaker type LTB 245E1with a single operating mechanism
type BLG 1002A.
1.1 Design of the circuit-breaker
The circuit-breaker is made up of three separate poles. These consist of three main
parts. At the bottom is an operating mechanism in an alloy housing, above this are
hollow post insulator through which the operating insulator runs and at the top is the
breaking unit. The poles are interconnected by pull-rods enclosed in a protective
tube.
Each breaking unit consists of a breaking chamber insulator, which together with an
upper and lower flange makes up the enclosure, and upper and lower current paths
and a contact system. The puffer runs on the outside of the lower current path. The
fixed contacts are integrated in the upper current path and the lower section of the
puffer.
The poles are mounted on separate hot-dipped galvanised column frames. The
frame consists of two welded formed plate halves, which are interconnected with
bolted cross stays.
Figure 1-1. Circuit-breaker type LTB 245E1, 3-pole
Weights of component parts:
Item Part Weight, kg
1 Circuit-breaker pole See dimension drawing
2 Operating mechanism 465
3 Frame 86-200
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B1
0085

Description Product Description
21HSB435455-2 enrev1
1.2 The circuit-breaker’s gas system
The circuit-breaker poles are permanently filled with SF6gas at a pressure of
0.7 MPa abs at 20°C on circuit-breakers whose performance is limited by a lowest
ambient temperature of ≥-30°C.
On circuit-breakers whose ambient temperature is ≥-40°C the circuit-breaker is
filled to a pressure of 0.5 MPa abs at 20°C. On circuit- breakers whose ambient
temperature is ≥-55°C the circuit-breaker is filled with a mixture of SF6gas and N2
gas or CF4gas at a pressure of 0.7 MPa abs at 20°C. The poles are fitted with
density monitors to monitor the pressure.
1.2.1 Opening and closing
The circuit-breaker poles work according to the Auto-PufferTM- principle with a
puffer cylinder (1) divided into two chambers. An Auto-PufferTM section (2) and a
compression section (3).
When the normal operating currents are cut
the SF6gas is compressed in the
compression section to an over-pressure.
When the arcing contacts part, the gas in
the compression section flows out and
extinguishes the arc at the passage trough
zero.
When the short-circuit currents are cut the
requisite extinguishing pressure is built-up
in the Auto-PufferTM section by heating the
arc. In this way a pressure increase is
achieved with energy from the arc and no
extra energy is required from the operating
mechanism.
On closing the puffer cylinder slides
upwards, the contacts engage one another
and the puffer cylinder is refilled with gas.
Figure 1-2. Circuit-breaker pole in the Close position.
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B10097

Product Description Description
1HSB435455-2 enrev1 3
1.3 Operating mechanism
LTB circuit-breaker is operated by a motor-charged spring operating mechanism
type BLG.
The operating mechanism is connected to the poles’ mechanism on the circuit-
breaker pole via a pull-rod system.
The circuit-breaker is closed by the operating mechanism, which houses the closing
springs. On closing, the opening springs are tensioned, which are permanently
coupled to the poles’ operating mechanisms. The trip latch in the operating
mechanism keeps the circuit-breaker in the closed position. Opening of the circuit-
breaker only requires the release of the trip latch..
The normal operating cycle is:
O-0.3s-CO-3 min-CO (according to IEC) or CO-15s-CO (according to ANSI).
1.4 Standards
The circuit-breakers comply with the requirements according to IEC Publication
60056 and in most cases also ANSI C37 and are restrike-free when breaking a
capacitive load.
.

1HSB435455-2 enrev1
0008
ABB Switchgear AB
Head Office
SE-771 80 LUDVIKA
SWEDEN
Telephone: [phone]
Telefax: [phone]

ABB Switchgear
SF6Circuit-Breaker Operating Mechanism
type BLG 1002A
1HSB515432-100 en rev2
Product Description