Overcurrent Protection Relay Block 7SJ80 with (3NO)

Features and technical specifications:

1. Motor Protection
2. CT inputs : 4 No’s
3. VT inputs : 3 No’s
4. Binary inputs : 3/7/11 No
5. Binary output’s : 5/8 NO
6. RS485 Communication Port

The following functions are available

1. Commands for the ctrl. of CB, disconnect switches (isolators/isolating switches)
2. Control through keyboard, binary inputs, DIGSI 4 or SCADA system
3. User-defined PLC logic with CFC (e.g. interlocking).                                                                                                                                                                                                                                                                                Monitoring functions :-
   1. Operational measured values V, I, f
   2.  Energy metering values Wp, Wq
   3.  Circuit-breaker wear monitoring
   4.  Minimum and maximum values
   5.  Trip circuit supervision (74TC)
   6.  Fuse failure monitor
   7.  8 oscillographic fault records.

This Over current Protection Relay Block is easily insert in your schematic diagram and connect as you like way.

The relays have all the required functions to be applied as a backup relay to a transformer differential relay. The SIPROTEC 7SJ80 features “flexible protection functions”. Up to 20 additional protection functions can be created by
the user. Therefore protection of change for frequency or reverse power protection can be realized, for example. The relay provides circuit-breaker control, further switching devices and automation functions. The integrated programmable logic (CFC) allows the user to add own functions, e.g. for the automation of switchgear (interlocking). The user is also allowed to generate user-defined messages. The SIPROTEC 7SJ80 perform control and monitoring functions and therefore provide the user with a cost-effective platform for power system management, that ensures
reliable supply of electrical power to the customers. The ergonomic design makes control easy from the relay front
panel. A large, easy-to-read display was a key design factor.

Operational indication :-
Event logs, trip logs, fault records and statistics documents are stored in the relay to provide the user or operator with all the key data required to operate modern substations.
Line protection :-
The SIPROTEC 7SJ80 units can be used for line protection of high and medium-voltage networks with grounded, low resistance grounded, isolated or a compensated neutral point.
Transformer protection :-
The relay provides all the functions for backup protection for transformer differential protection. The inrush suppression effectively prevents unwanted trips that can be caused by inrush currents. The high-impedance restricted ground-fault protection detects short-circuits and insulation faults on the transformer.
Backup protection :-
As a backup protection the SIPROTEC 7SJ80 devices are universally applicable.