SEB Divisione Elettronica e Sistemi INDEX
INDEX
1GENERAL CHARACTERISTICS..................................................................................1
1.1 Operation of the differential thresholds..................................................................3
1.2 Transformer differential protection (ANSI 87T)......................................................6
1.3 Overcurrent thresholds (ANSI 51) .........................................................................6
1.4 Residual overcurrent (ANSI 51N) ..........................................................................7
2FRONT PANEL KEYS ..................................................................................................8
3FRONT PANEL LED SIGNALING ................................................................................9
4PROGRAMMING AND TEST .....................................................................................10
4.1 How to program the protection relay....................................................................10
4.2 How to modify a visualized parameter.................................................................11
4.3 Reset ...................................................................................................................11
4.4 Test of output relays ............................................................................................12
5DISPLAY AND PROGRAMMING ...............................................................................13
5.1 Standard display..................................................................................................13
5.2 Visualization structure .........................................................................................14
5.3 Address and time (fig. 1) .....................................................................................19
5.4 Display selection and drop-off delay (fig. 1).........................................................20
5.5 Rated values of the protected transformer (picture 2) .........................................21
5.6 Thresholds and time delays set-up (fig. 2)...........................................................24
5.6.1 Percentage biased differential thresholds (87T - fig. 2) ................................24
5.6.2 Overcurrent thresholds (51 - fig. 2)...............................................................27
5.6.3 Residual overcurrent thresholds (51N - fig. 2) ..............................................28
5.7 Output relays programming (fig. 3) ......................................................................29
5.8 Digital inputs function programming (fig. 3) .........................................................30
5.9 Parameter values visualization (fig. 4).................................................................31
5.10 Events (fig. 5) ......................................................................................................35
5.11 Trips counters (fig. 5)...........................................................................................38
6INSTALLATION ..........................................................................................................40
6.1 Supplied kit..........................................................................................................40
6.2 Cabling ................................................................................................................40
6.3 Relays R3 and R4 - Signaling / Command set-up ...............................................46
6.4 RS485 serial communication port........................................................................46
7TECHNICAL DATA.....................................................................................................47
8TABLE ........................................................................................................................48
Information printed in this manual subject to change without prior notice.
This manual must not be reproduced in whole or in part, in any form or by any means
without the express written permission of SEB Divisione Elettronica e Sistemi.
