SIPROTEC 7SJ602 - Overcurrent and Overload Relay
Description
The SIPROTEC 7SJ602 is a numerical overcurrent relay which, in addition to its primary use in radial distribution networks and motor
protection, can also be employed as backup for line, transformer and generator differential protection. The SIPROTEC 7SJ602 provides
definite-time and inverse-time overcurrent protection along with overload and unbalanced-load (negative-sequence) protection
for a very comprehensive relay package.
For applications with earth-current detection two versions are available: One version with four current transformer inputs for nondirectional earth (ground) fault detection and a second version with three current inputs (2 phase, 1 earth/ground) and one voltage
input for directional earth (ground) fault detection. The flexible communication interfaces are open for modern communication architectures with control systems.
Function overview
Feeder protection
• Overcurrent-time protection
• Sensitive earth-fault detection
• Directional sensitive earth-fault detection
• Displacement voltage
• Disk emulation
• Overload protection
• Breaker failure protection
• Negative-sequence protection
• Cold load pickup
• Auto-reclosure
• Trip circuit supervision
Motor protection
• Starting time supervision
• Locked rotor
• Restart inhibit
• Undercurrent monitoring
• Temperature monitoring
Control functions
• Commands for control of a circuitbreaker
• Control via keyboard, DIGSI 4 or SCADA system
Measuring functions
• Operational measured values I, V
• Power measurement P, Q, S, Wp, Wq
• Slavepointer
• Mean values
Monitoring functions
• Fault event logging with time stamp (buffered)
• 8 oscillographic fault records
• Continuous self-monitoring
Communication interfaces
• System interface
− IEC 60870-5-103 protocol
− PROFIBUS-DP
− MODBUS RTU/ASCII
• Front interface for DIGSI 4
Hardware
• 4 current transformers or
• 3 current + 1 voltage transformers
• 3 binary inputs
• 4 output relays
• 1 live status contact
The SIPROTEC 7SJ602 is a numerical overcurrent relay which, in addition to its primary use in radial distribution networks and motor
protection, can also be employed as backup for line, transformer and generator differential protection. The SIPROTEC 7SJ602 provides
definite-time and inverse-time overcurrent protection along with overload and unbalanced-load (negative-sequence) protection
for a very comprehensive relay package.
For applications with earth-current detection two versions are available: One version with four current transformer inputs for nondirectional earth (ground) fault detection and a second version with three current inputs (2 phase, 1 earth/ground) and one voltage
input for directional earth (ground) fault detection. The flexible communication interfaces are open for modern communication architectures with control systems.
Function overview
Feeder protection
• Overcurrent-time protection
• Sensitive earth-fault detection
• Directional sensitive earth-fault detection
• Displacement voltage
• Disk emulation
• Overload protection
• Breaker failure protection
• Negative-sequence protection
• Cold load pickup
• Auto-reclosure
• Trip circuit supervision
Motor protection
• Starting time supervision
• Locked rotor
• Restart inhibit
• Undercurrent monitoring
• Temperature monitoring
Control functions
• Commands for control of a circuitbreaker
• Control via keyboard, DIGSI 4 or SCADA system
Measuring functions
• Operational measured values I, V
• Power measurement P, Q, S, Wp, Wq
• Slavepointer
• Mean values
Monitoring functions
• Fault event logging with time stamp (buffered)
• 8 oscillographic fault records
• Continuous self-monitoring
Communication interfaces
• System interface
− IEC 60870-5-103 protocol
− PROFIBUS-DP
− MODBUS RTU/ASCII
• Front interface for DIGSI 4
Hardware
• 4 current transformers or
• 3 current + 1 voltage transformers
• 3 binary inputs
• 4 output relays
• 1 live status contact
