Siemens Siprotec 4 SIPROTEC 7SJ63 Protection Relay
The Siemens SIPROTEC 7SJ63 is a powerful protection, control, and monitoring relay designed for distribution feeders and transmission lines across all voltage levels. It supports networks that are grounded, low-resistance grounded, ungrounded, or compensated, and is suitable for both radial and looped systems. The relay includes flexible time-overcurrent and directional overcurrent protection (definite, inverse, or user-defined characteristics). Additionally, it provides comprehensive motor protection, including undercurrent monitoring, start-up supervision, restart inhibit, and locked rotor detection.With integrated programmable logic (CFC), the SIPROTEC 7SJ63 allows users to easily implement automation and interlocking functions. It supports a wide range of communication protocols and provides extensive measurement and monitoring capabilities for modern power systems.
Technical Specifications
Protection Functions:
Overcurrent protection (definite/inverse/user-defined)
Directional overcurrent protection (definite/inverse/user-defined)
Sensitive/non-directional earth-fault detection
Displacement voltage, intermittent earth-fault protection
High-impedance restricted earth fault, inrush restraint
Motor protection, overload protection, temperature monitoring
Under-/overvoltage and frequency protection
Breaker failure, negative-sequence, and phase-sequence protection
Auto-reclosure, fault locator, lockout
Control & Logic:
Flexible number of switching devices
Switching element positions shown on graphical display
Local/remote switching via key-operated switch
Control via keyboard, binary inputs, DIGSI 4, or SCADA
Extended user-defined logic via CFC (e.g., interlocking)
Monitoring Functions:
Measurement of V, I, f
Energy metering (active/reactive power)
Breaker wear monitoring and trip circuit supervision
Fuse failure monitoring
8 oscillographic fault records
Communication Interfaces:
IEC 60870-5-103 / IEC 61850
PROFIBUS-FMS/-DP, DNP 3.0, MODBUS RTU
DIGSI 4 front/service interface (modem)
Time synchronization via IRIG-B / DCF77
Overcurrent protection (definite/inverse/user-defined)
Directional overcurrent protection (definite/inverse/user-defined)
Sensitive/non-directional earth-fault detection
Displacement voltage, intermittent earth-fault protection
High-impedance restricted earth fault, inrush restraint
Motor protection, overload protection, temperature monitoring
Under-/overvoltage and frequency protection
Breaker failure, negative-sequence, and phase-sequence protection
Auto-reclosure, fault locator, lockout
Control & Logic:
Flexible number of switching devices
Switching element positions shown on graphical display
Local/remote switching via key-operated switch
Control via keyboard, binary inputs, DIGSI 4, or SCADA
Extended user-defined logic via CFC (e.g., interlocking)
Monitoring Functions:
Measurement of V, I, f
Energy metering (active/reactive power)
Breaker wear monitoring and trip circuit supervision
Fuse failure monitoring
8 oscillographic fault records
Communication Interfaces:
IEC 60870-5-103 / IEC 61850
PROFIBUS-FMS/-DP, DNP 3.0, MODBUS RTU
DIGSI 4 front/service interface (modem)
Time synchronization via IRIG-B / DCF77
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