SIPOTEC 7SJ46 easy - Numerical overcurrent protection
Description
The SIPROTEC easy 7SJ46 is a numerical overcurrent protection relay which is primarily intended as a radial feeder or
transformer protection (backup) in electrical networks. It provides definite-time and inverse-time overcurrent protection
according to IEC and ANSI standards. The 7SJ46 relay has an AC and DC auxiliary power supply with a wide range
allowing a high degree of flexibility in its application.
Function overview
• Universal application due to integrated wide range AC/DC power supply.
• Standard current transformers (1 A/5 A)
• Easy mounting due to compact housing
• Easy connection via screw-type terminals
Protection functions
• 2-stage overcurrent protection
• Definite-time and inverse-time characteristics (IEC/ANSI)
• High-current stage I>> or calculated earth-current stage IE> or IEp> selectable
• Two command outputs for “trip” or “pickup”
• Combination with electromechanical relays is possible due to the emulation algorithm
Monitoring functions
• One live contact for monitoring
• Hardware and software are continuously monitored during operation Front design
• Simple setting via DIP switches (self-explaining)
• Settings can be executed without auxiliary voltage – no PC
• Individual phase pickup indication with stored or not stored LEDs
• Trip indication with separate LED
Additional features
• Optional version available for most adverse environmental conditions (condensation permissible)
• Flush mounting or surface (rail) mounting
The SIPROTEC easy 7SJ46 is a numerical overcurrent protection relay which is primarily intended as a radial feeder or
transformer protection (backup) in electrical networks. It provides definite-time and inverse-time overcurrent protection
according to IEC and ANSI standards. The 7SJ46 relay has an AC and DC auxiliary power supply with a wide range
allowing a high degree of flexibility in its application.
Function overview
• Universal application due to integrated wide range AC/DC power supply.
• Standard current transformers (1 A/5 A)
• Easy mounting due to compact housing
• Easy connection via screw-type terminals
Protection functions
• 2-stage overcurrent protection
• Definite-time and inverse-time characteristics (IEC/ANSI)
• High-current stage I>> or calculated earth-current stage IE> or IEp> selectable
• Two command outputs for “trip” or “pickup”
• Combination with electromechanical relays is possible due to the emulation algorithm
Monitoring functions
• One live contact for monitoring
• Hardware and software are continuously monitored during operation Front design
• Simple setting via DIP switches (self-explaining)
• Settings can be executed without auxiliary voltage – no PC
• Individual phase pickup indication with stored or not stored LEDs
• Trip indication with separate LED
Additional features
• Optional version available for most adverse environmental conditions (condensation permissible)
• Flush mounting or surface (rail) mounting
