SIPROTEC 4 7SJ62 - Multifunction Protection
Description
The SIPROTEC 4 7SJ62 relays can be used for line protection of high and medium voltage networks with earthed (grounded),
low-resistance earthed, isolated or compensated neutral point. With regard to motor protection, the SIPROTEC 4 7SJ62
is suitable for asynchronous machines of all sizes. The relay performs all functions of backup protection supplementary to
transformer differential protection.
7SJ62 is featuring the "flexible protection functions". Up to 20 protection functions can be added according to individual
requirements. Thus, for example, a rateof-frequency-change protection or reverse power protection can be implemented.
The relay provides control of the circuitbreaker, further switching devices and automation functions. The integrated
programmable logic (CFC) allows the user to implement their own functions, e. g. for the automation of switchgear
(interlocking). The user is also allowed to generate user-defined messages.
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. earth-fault detection
• Displacement voltage
• Intermittent earth-fault protection
• High-impedance restricted earth fault
• Inrush restraint
• Motor protection
– Undercurrent monitoring
– Starting time supervision
– Restart inhibit
– Locked rotor
– Load jam protection
• Overload protection
• Temperature monitoring
• Under-/overvoltage protection
• Under-/overfrequency protection
• Breaker failure protection
• Negative-sequence protection
• Phase-sequence monitoring
• Synchro-check
• Fault locator
• Lockout
• Auto-reclosure
Control functions/programmable logic
• Commands f. ctrl of CB and of isolators
• Position of switching elements is shown on the graphic display
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• 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)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77
Hardware
• 4 current transformers
• 3/4 voltage transformers
• 8/11 binary inputs
• 8/6 output relays
The SIPROTEC 4 7SJ62 relays can be used for line protection of high and medium voltage networks with earthed (grounded),
low-resistance earthed, isolated or compensated neutral point. With regard to motor protection, the SIPROTEC 4 7SJ62
is suitable for asynchronous machines of all sizes. The relay performs all functions of backup protection supplementary to
transformer differential protection.
7SJ62 is featuring the "flexible protection functions". Up to 20 protection functions can be added according to individual
requirements. Thus, for example, a rateof-frequency-change protection or reverse power protection can be implemented.
The relay provides control of the circuitbreaker, further switching devices and automation functions. The integrated
programmable logic (CFC) allows the user to implement their own functions, e. g. for the automation of switchgear
(interlocking). The user is also allowed to generate user-defined messages.
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. earth-fault detection
• Displacement voltage
• Intermittent earth-fault protection
• High-impedance restricted earth fault
• Inrush restraint
• Motor protection
– Undercurrent monitoring
– Starting time supervision
– Restart inhibit
– Locked rotor
– Load jam protection
• Overload protection
• Temperature monitoring
• Under-/overvoltage protection
• Under-/overfrequency protection
• Breaker failure protection
• Negative-sequence protection
• Phase-sequence monitoring
• Synchro-check
• Fault locator
• Lockout
• Auto-reclosure
Control functions/programmable logic
• Commands f. ctrl of CB and of isolators
• Position of switching elements is shown on the graphic display
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• 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)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77
Hardware
• 4 current transformers
• 3/4 voltage transformers
• 8/11 binary inputs
• 8/6 output relays
