ABB SF6 LTB 245E1 BLG 1002A Bedienungsanleitung

Product Manual

1HSB435416-2 en Rev 1

LTB 245E1

BLG 1002A

3-pole operation

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.

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

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.

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: +46 (0) 240 782 000

Telefax: +46 (0) 240 714 928

ABB Switchgear

SF6Circuit-Breaker Operating Mechanism

type BLG 1002A

1HSB515432-100 en rev2

Product Description

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