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1/7 ABB S.p.A. PPD Unita Operativa ADDA - HV

FAST EARTHING SWITCH

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2/7 ABB S.p.A. PPD Unita Operativa ADDA - HV

INDEX

1. GENERAL ....................................................................................................................3 2. DESCRIPTION .............................................................................................................3

2.1 Housing ................................................................................................................3 2.2 Contacts ...............................................................................................................3 2.3 Mechanism (spring group)..................................................................................3 2.4 View port ..............................................................................................................3

3. Working principle .......................................................................................................3 4. MAINTENANCE ...........................................................................................................3 5. DIMENSIONS...............................................................................................................4

CONTENTS OF FIGURES

Figura 1 - FES open position with spring charged .........................................................5 Figura 2 - FES moving.......................................................................................................5 Figura 3 - FES close position with spring discharged....................................................5 Figura 4 - Front view..........................................................................................................6 Figura 5 - lateral view ........................................................................................................6

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3/7 ABB S.p.A. PPD Unita Operativa ADDA - HV

1. GENERAL

Fast Earthing Switch SBT/R 145-170 kV consists of three separate poles driven by mechanical drive BES 7 (see related manual). Energy needed for fast closing operation of earthing switch is stored in two springs.

2. DESCRIPTION

2.1 Housing Housing (1) is made in Aluminium casting including two flanges (2) to connect contiguous components; it is pre-set for operating shaft incoming (3). Housing is closed on side by a cover on which view port and fixing points for earthing plait are mounted.

2.2 Contacts They include: a mobile contact (5); contact fingers (6) fastened on the bar (7); contact shaft (3); fixed contact (8) fastened on the cover (9) where the view port is assembled (10). 2.3 Mechanism (spring group) Each mechanism is made of: one spring (11) mounted on a spring guide (12) operated by drive shaft (3) through charging spring shaft (13). Shock-absorber (14) and lateral plates (15) complete the device. 2.4 View port The position of mobile contact (5) is visible across a view port (10) mounted on the adjacent cover (9).

3. WORKING PRINCIPLE

SBT/R is shown in open position (figure 1), with closing spring charged. Contact is moving slowly till the dead center position (figure 2), overcome this point, mobile contact begin moving fast to close position (figure 3).

4. MAINTENANCE

For regular condition of exercise no maintenance is required. The SBT/R can carry out two closing operations at 40 kA - 100kA peak, without any reduction of insulation level. Subsequentely maintenance is needed and consists in substitution of mobile and fixed contacts and SF6 gas replacement for gas compartment where FES is allocated.

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4/7 ABB S.p.A. PPD Unita Operativa ADDA - HV

5. DIMENSIONS

Dimensions are not binding. Due to technical improvement afterwards, ABB P.T. U.O. Adda has the right of varying dimensions and characteristics without forewarn

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5/7 ABB S.p.A. PPD Unita Operativa ADDA - HV

Figure 1 Fast Earthing Switch open position with spring charged

Figure 2 Fast Earthing Switch moving

Figure 3 Fast Earthing Switch close position with spring discharged

LEGENDA: 1- Housing 2- Flange 3- Operating shaft 4- Fixing point for earthing plait 5- Mobile contact 6- Finger contact 7- Bar 8- Fixed contact 9- Cover 10-View port 11- Spring 12- Spring guide 13- Charging spring drive 14-Shock absorber 15- Lateral plates 16- Contact sheet

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6/7 ABB S.p.A. PPD Unita Operativa ADDA - HV

Figura 4 Frontal view

Figura 5 Lateral view

1

2 3

4

5

1

2

LEGENDA: 1- Transmission box 2- Spring Group 3- View port 4- Transmission shaft 5- FES Drive BES 7

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7/7 ABB S.p.A. PPD Unita Operativa ADDA - HV

NOTES If you have comments we kindly ask you to write that here below and send us this page back. Thank you for your collaboration

Copyright We reserve all rights to this document and to the object described therein. The recipient of this document recognizes these rights and will not without our prior written approval make this document available either in part or in whole to any third party or use it for any purpose other than that for which it was presented to him. ABB PT S.p.A

Address ABB S.p.A PPD U.O. Adda - HV Via dei Ceramisti 26900 Lodi Italy tel. +39.0371 452.1 fax +39.0371 452.222 internet : http://www.abb.it

Notes These instructions describe high-tech high voltage products, and are specifically aimed at explaining the use of such products. These instructions are not meant to replace valid regulations, concerning high voltage systems and appliances, and are intended for use by specialists in the electricity field.