PRESS RELEASE
February 6, 1996
Differential relay for power
transformers and generators

A new stabilised, multi-function differential relay has been launched by ABB Transmit Oy, Finland. The relay, designated Spad 346 C, is intended for the winding short circuit, interturn short circuit, pole short circuit and earth-fault protection of power transformers and generators. Extensive fault recorder functions integrated into the relay are said to provide relevant network information for thorough fault analyses after relay operation.

The differential relay differs from other similar products in many respects. No interposing current transformers are needed for the protection of two-winding transformers. Matching of the relay to the vector group of the power transformer, eliminating of a possible zero sequence current and setting of the current transformer ratios are reported to be easily accomplished numerically.
Even for Y/y-connected power transformers with earthed neutrals, the relay has high stability. This is obtained through elimination of the zero sequence current by selecting a suitable vector group or through direct numerical elimination of the zero sequence current.
On commissioning relays, verification of the correctness of the external wiring is often regarded as a problem. With the new relay, this problem is easily solved by means of an in-built low-voltage test and sensitive amplitude and phase angle measurement functions.
The Spad 346 C relay is equipped with a local man-machine interface on its front panel. For remote communication with higher-level systems, the relay is provided with a serial port.
The development of the new relay has been carried out in close co-operation with protection experts and key customers around the world. Judging from the current level of interest, the relay is expected to gain a firm position on the market.
The relay is part of ABB's Distribution Automation concept, which is a product segment of Panorama, ABB's solution for the management of electric power systems./ins



Caption:
The new three-phase stabilised differential relay Spad 346 C will be used for the protection of power transformers and generators.



For further information see attached list of contact addresses:

Canada
ABB Inc.
TNP marketing Att: Mr Cezary Nierojewski
200 Chisholm Drive
Milton, Ontario L9T 5E7
Canada
Telephone +1 905-875 4500
Telefax +1 905 875 4487

France
ABB Energie SNC
Dept. Protection et Controle Att: Mr
6 rue de peupliers
F-92004 Nanterre
France
Telephone +33 1 47697244
Telefax +33 1 47609152

Belgium
Asea Brown Boveri S.A.
Dept. TNP Att: Mr Stefaan Volkaert
Hoge Wei 27
B-1930 Zaventem
Belgium
Telephone +32 2 71 86 411
Telefax +32 2 71 86 661

Malaysia
ABB Transmission & Distribution Sdn. Bhd.
1 st floor, 63 - 65 Wisma ABB Jalan Ampang Att: Mr Harvinder Singh
P.O. Box 11028
50732 Kuala Lumpur
Malaysia
Telephone +60 3 238 9063
Telefax +60 3 201 8545

South Africa
ABB Powertech (Pty) Ltd
Relay Division Att: Mr Jim Taylor
515 Carl Street
P.O.Box 19582
Pretoria West 0117
South Africa
Telephone +27 (0)12 318 9911
Telefax +27 (0)12 327 2809

New Zealand
ABB Power Limited
Generation & Transmission Att: Mr Frank Rickaby
143 Hutt Road
P.O. Box 38692
Petone
New Zealand
Telephone +64 4 569 3740
Telefax +64 4 568 8636






South Korea
Asea Brown Boveri Ltd.
Oksan Bldg. 8 floor Att: Mr Y. J. Kim
C.P.O. Box 6131
Seoul
South Korea
Telephone +82 2 528 3060
Telefax +82 2 528 3091

Ireland
ABB Ltd.
Dept. Power Division Att: Mr Bill Cassidy
Belgard Road,
Tallaght
Dublin 24
Ireland
Telephone +353 1 452 2622
Telefax +353 1 405 7370

United Kingdom
ABB Power T&D Ltd.
Protection and Control Dept. Att: Mr Terry Jones
Darby House
Lawn Central, Telford
Shropshire TF3 4JB
United Kingdom
Telephone +44 1 952 290 000
Telefax +44 1 952 291 778

Sweden
ABB Kraft AB
S-72172 Västerås
Sverige
Telephone +46 21 320 851
Telefax +46 21 320 850

Australia
ABB Power Transmission Pty Limited Att: Mr Russel Ellen
Beresford Road
P.O. BOX 574
Lilydale, Victoria
3140 Australia
Telephone +61 3 9735 7389
Telefax +61 3 9735 7371

Czech Republic
ABB Energo s.r.o.
Marketing and Sales Att: Mr Pavel Nozek
Komenského 821
P.O. Box 70
541 70 Trutnov
Czech Republic
Telephone +42 439 808 111
Telefax +42 439 808 501

Argentina
ABB T&D Att: Mr Alejandro Hunko
Av. L.N. Alem 822, Piso 9
1001 Buenos Aires
Argentina
Telephone +54 1 311 5386
Telefax +54 1 313 4744

Spain
ABB Subestaciones S.A. Att: Mr Jose Gonzalez
C/Ramírez de Arellano,17
28043 Madrid
Spain
Telephone 990 34 1 581 0156
Telefax 990 34 1 581 0174

Portugal
ABB Electrica, Lda Att: Mr Alvaro Freitas
P.O.Box 7573 Alfagide
2720 AMADORA
Portugal
Telephone +351 1 4169318
Telefax +351 1 4169224

Brazil
Asea Brown Boveri Ltda Att: Mr Xavier Celso
Av. Monteiro lobato, 3285
C.P. 71, Cep 07190
Guarulhos - SP
Brazil
Telephone +55 11 964 8188
Telefax +55 11 964 8409

The Netherlands
ABB Industrie B.V.
Dept. IPV
Marten Meesweg 5
P.O.Box 113
3000 AC Rotterdam
Netherlands
Telephone +31 10 4078481
Telefax +31 10 4562322

Switzerland
ABB Network Partner AG Att: Mr Gerhard Wacha
Haselstrasse 16/122
CH-5401 Baden
Switzerland
Telephone 0 990 41 56 205 77 44
Telefax 0 990 41 56 205 55 77

Germany
ABB Netzleittechnik GmbH Att: Mr Klaus Jost
Wallstadter Strasse 53-59
D-68520 Ladenburg
Germany
Telephone 990-49-6203-712937
Telefax 990-49-6203 12902

Austria
ABB Energie AG
Dept. EKHS Att: Mr Ernst Szabo
Wienerbergstrasse 11 B
Postfach 184
A-1101 Wien
Austria
Telephone +43 1 6 0109 2238
Telefax +43 1 6 0109 822

Denmark
ABB Energi & Industri A/S Att. Mr Boris Reimann
Håndvaerkervej 23
DK-7000 FREDERICIA
Denmark
Telephone +45 79 247 924
Telefax +45 79 247 927

Norway
ABB Energi AS Att: Mr Arne Volden
Lörenfaret 1
P.O.Box 214 Økern
N-0510 OSLO 5
Norway
Telephone +47 22 729 413
Telefax +47 22 720 822

Finland
ABB Transmit Oy
Releet ja kaukokäytöt Att: Ins. Rauno Suomela / RAO
PL 699
65101 VAASA
Puh. 961-316o
Fax. 961-316 1094

Japan
ABB K.K.
Power Division Att: Mr Taku Niioka
2-39, Akasaka 5-chome, Minato-ku
Tokyo 107
Japan
Telephone +81 3 5563 8737
Telefax +81 3 3584 0483

Mexico
ABB Sistemas S.A. Att: Mr Mariano Maldonado
Blvd. Centro Industrial No. 12
Tlalnepantla, Edo. de Mexico
Apartado postal M-10726
C.P. 54070 Mexico
Mexico
Telephone +52 5 565 4011
Telefax +52 5 328 1488

Italy
ABB Muratori S.p.A. Att: Mr Luca Oliviero Leone
Via Cancelliera 13/15
00040 ARICCIA (ROMA)
Italy
Telephone +39-6-934 621
Telefax +39-6-9343 153

Hungary
ABB Energir Ltd. Att. Mr Halapi, Tibor
Kunigunda u. 47Zách u. 3/B
H-1037 Budapest
Hungary
Telephone +36 1 188 6774
Telefax +36 1 250 4014



Turkey
ABB Elektrik Sanayi A.S.
Distribution Products & Systems Att: Mr Ullattil Manmadhan
P.O.Box 20
81412 Kartal - Istanbul
Turkey
Telephone +90 216 387 3750
Telefax +90 216 353 8807

Greece
Asea Brown Boveri S.A.
15, Messogion Street Att: Mr Tsítsias
GR-11526 Athens
Greece
Telephone +30 1 770 3415-18
Telefax +30 1 775 3072


Poland
ABB Network Control & Protection
Division of ABB Industrial Components Ltd Att: Mr W. Karski
43 Chlapowskiego Str.
PL-02-786 Warszawa
Poland
Telephone + 48 22 6444 544;+48 22 644 2490;+48 22 644 2336;
Telefax + 48 22 6443 777

Russia
ABB Relays Cheboksary Ltd.
Krasnokazarmennaya St..12 Att: Mr G Malbasic
RU-111250 Moscow
Russia
Telephone +7 095 956 05 44
Telefax +7 095 956 30 18

China
ABB Transmission and Distribution Ltd.
Network Control & Protection Division Att: Mr Robert Yang
8/F., Evergo House,
G.P.O. Box 448, 38 Gloucester Road
Wanchai, Hong Kong
Telephone +852 2922 2200
Telefax +852 2922 2332