Over-current relay
7SJ61
SIEMENS Smart Grid
Multifunction Protection Relay SIPROTEC 4 7SJ61/62/63/64
The SIPROTEC 4 units are 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.
Protection functions
* Time-overcurrent protection
* Directional time-overcurrent protection
* Sensitive dir./non-dir. earth-fault detection
* Displacement voltage
* Intermittent earth-fault protection
* High-impedance restricted earth fault
* Inrush restraint
* Motor protection
* Overload protection
* Temperature monitoring
* Under-/overvoltage protection
* Under-/overfrequency protection
* Rate-of-frequency-change protection
* Power protection (e.g. reverse, factor)
* Breaker failure protection
* Negative-sequence protection
* Phase-sequence monitoring
* Synchronization
* Auto-reclosure
* Fault locator
* Lockout
Feature: IEC 61850
The SIPROTEC 4 units are 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.
Protection functions
* Time-overcurrent protection
* Directional time-overcurrent protection
* Sensitive dir./non-dir. earth-fault detection
* Displacement voltage
* Intermittent earth-fault protection
* High-impedance restricted earth fault
* Inrush restraint
* Motor protection
* Overload protection
* Temperature monitoring
* Under-/overvoltage protection
* Under-/overfrequency protection
* Rate-of-frequency-change protection
* Power protection (e.g. reverse, factor)
* Breaker failure protection
* Negative-sequence protection
* Phase-sequence monitoring
* Synchronization
* Auto-reclosure
* Fault locator
* Lockout
Feature: IEC 61850
