Multifunction protection with synchronization
SIPROTEC 7SJ64
The SIPROTEC 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 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.
Features
The SIPROTEC 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.
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 SIPROTEC 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.
Hardware
4 current transformers
4 voltage transformers
7 to 48 binary inputs
- 5 to 21 output relays
- Up tp 4 high-duty relays
- Text display or graphical display
- Flush-mounting housing, surface-mounting or detached display
Communication interfaces
System port
– IEC 61850
– PROFINET
– DNP3 TCP
– IEC 60870-5-103
– PROFIBUS-DP
– DNP 3.0– MODBUS RTU
- Service port
– DIGSI 4,
– Modem
– Thermobox - Additional port
– Thermobox Front port
– DIGSI 4
Time synchronization via IRIG B/DCF77
Functions
Protection functions
- Overcurrent protection
Directional overcurrent protection
Sensitive dir./non-dir. earth-fault detection
Displacement voltage
Intermittent earth-fault protection
Directional intermittent ground 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)
Undervoltage-controlled reactive power protection
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
