SIPROTEC 4 7SJ64 - Multifunction Protection with Synchro Function
Description
The SIPROTEC 4 7SJ64 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. The
SIPROTEC 4 7SJ64 is equipped with a synchronization function which provides the operation modes ‘synchronization check’
(classical) and ‘synchronous/asynchronous switching’ (which takes the CB mechanical delay into consideration). Motor protection comprises undercurrent monitoring, starting time supervision, restart inhibit, locked rotor, load jam protection as well as motor statistics.
The 7SJ64 is featuring the "flexible protection functions". Up to 20 protection functions can
be added according to individual requirements. Thus, for example, rate-of-frequency-change protection or reverse power
protection can be implemented.
SIPROTEC 4 7SJ64
Multifunction Protection Relay with Synchronization
LSP2316-afpen.tif
The relay provides easy-to-use local control and automation functions. The number of controllable switchgear 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 switchgear (interlocking). CFC capacity is much larger compared to 7SJ63 due to extended CPU power. The user is able to generate user-defined messages as well.
The flexible communication interfaces are open for modern communication architectures with control systems.
Function overview
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
Control functions/programmable logic
• Flexible number of switching devices
• Position of switching elements is shown on the graphic display
• Local/remote switching via keyoperated switch
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• Extended user-defined logic with CFC (e.g. interlocking)
Monitoring functions
• Operational measured values V, I, f,...
• Energy metering values Wp, Wq
• Circuit-breaker wear monitoring
• Slave pointer
• Trip circuit supervision
• Fuse failure monitor
• 8 oscillographic fault records
• Motor statistics
Communication interfaces
• System interface
– IEC 60870-5-103, IEC 61850
– PROFIBUS-FMS / DP
– DNP 3.0 / MODBUS RTU
• Service interface for DIGSI 4 (modem)
• Additional interface for temperature detection (RTD-box)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77
The SIPROTEC 4 7SJ64 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. The
SIPROTEC 4 7SJ64 is equipped with a synchronization function which provides the operation modes ‘synchronization check’
(classical) and ‘synchronous/asynchronous switching’ (which takes the CB mechanical delay into consideration). Motor protection comprises undercurrent monitoring, starting time supervision, restart inhibit, locked rotor, load jam protection as well as motor statistics.
The 7SJ64 is featuring the "flexible protection functions". Up to 20 protection functions can
be added according to individual requirements. Thus, for example, rate-of-frequency-change protection or reverse power
protection can be implemented.
SIPROTEC 4 7SJ64
Multifunction Protection Relay with Synchronization
LSP2316-afpen.tif
The relay provides easy-to-use local control and automation functions. The number of controllable switchgear 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 switchgear (interlocking). CFC capacity is much larger compared to 7SJ63 due to extended CPU power. The user is able to generate user-defined messages as well.
The flexible communication interfaces are open for modern communication architectures with control systems.
Function overview
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
Control functions/programmable logic
• Flexible number of switching devices
• Position of switching elements is shown on the graphic display
• Local/remote switching via keyoperated switch
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• Extended user-defined logic with CFC (e.g. interlocking)
Monitoring functions
• Operational measured values V, I, f,...
• Energy metering values Wp, Wq
• Circuit-breaker wear monitoring
• Slave pointer
• Trip circuit supervision
• Fuse failure monitor
• 8 oscillographic fault records
• Motor statistics
Communication interfaces
• System interface
– IEC 60870-5-103, IEC 61850
– PROFIBUS-FMS / DP
– DNP 3.0 / MODBUS RTU
• Service interface for DIGSI 4 (modem)
• Additional interface for temperature detection (RTD-box)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77
