Multifunction Protection Relay Block 7SJ63

Type : 7SJ63

The following functions are available

1. Time-over current protection
2. Directional time-over current protection
3. Motor protection
4. Overload protection
5. Under-/overvoltage protection
6. Under-/over frequency protection
7. Breaker failure protection
8. Negative-sequence protection
9. Intermittent earth-fault protection                                                                                                                                                                                                                    This Multifunction Protection Relay block is easily insert in your schematic diagram and connect as you like way.                                                                                                   The SIPROTEC 4 7SJ63 can be used as a protective control and monitoring relay for distribution feeders and transmission lines of any voltage in networks that are earthed (grounded), low-resistance earthed, unearthed, or of a compensated neutral point structure. The relay is suited for networks that are radial or looped, and for lines with single or multi-terminal feeds. Regarding the time-over current/directional time overcurrent
   protection the characteristics can be either definite time, inverse time or user-defined. The SIPROTEC 4 7SJ63 is equipped with motor protection applicable for asynchronous machines of all sizes. Motor protection
   comprises undercurrent monitoring, starting time supervision, restart inhibit, locked rotor. The relay provides easy-to-use local control and automation functions. The number of controllable switch gear depends only on the number of available inputs and outputs. The integrated programmable logic (CFC) allows the user to implement their own functions, e.g. for the automation of switch gear (interlocking). The user is able to generate user defined messages as well.The SIPROTEC 4 7SJ63 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 graphic display was a major design aim.