Multifunction Protection Relay Block 7SJ61 With (1NO+0NC)

Features and technical specifications:

1. Motor Protection
2. CT inputs : 4 No’s
3. Binary inputs : 3/8/11 No
4. Binary output’s : 4/8/6 NO
5. External DC power supply required
6. RS485 Communication Port

The following functions are available

1. Time-overcurrent protection (definite-time/inverse-time/user-def.)
2. Sensitive earth-fault detection
3. Intermittent earth-fault protection
4. High-impedance restricted earth fault
5. Inrush restraint
6. Overload protection
7. Temperature monitoring
8. Breaker failure protection
9. Negative-sequence protection
10. Auto-reclosure
11. Lockout

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

The relay performs all functions of backup protection supplementary to transformer differential protection. The relay provides control of the circuit breaker, further switching devices and automation functions. The integrated
programmable logic (CFC) allows the user to implement their own functions, e. g. for the automation of switchgear
(interlocking). The user is also allowed to generate user-defined messages. The flexible communication interfaces
are open for modern communication architectures with control systems. The SIPROTEC 4 7SJ61 unit is a numerical
protection relay that also performs control and monitoring functions and therefore supports the user in cost effective power system management, and ensures reliable supply of electric power to the customers. Local operation has been designed according to ergonomic criteria. A large, easy-to-read display was a major design aim.

Line protection :-
The relay is a non-directional overcurrent relay which can be used for line protection of high and medium-voltage networks with earthed (grounded), low-resistance earthed, isolated or compensated neutral point.

Motor protection :-
When protecting motors, the 7SJ61 relay is suitable for asynchronous machines of all sizes.

Transformer protection :-
The relay performs all functions of backup protection supplementary to transformer differential protection. The inrush suppression effectively prevents tripping by inrush currents. The high-impedance restricted earth-fault
protection detects short-circuits and insulation faults on the transformer.

Backup protection :-
The 7SJ61 can be used universally for backup protection. Flexible protection functions By configuring a connection between a standard protection logic and any measured or derived quantity, the functional scope of the relays can be easily expanded by up to 20 protection stages or protection functions.

Metering values :-
Extensive measured values, limit values and metered values permit improved system management.