Overcurrent Protection
General Information
- Description
In many fields of applications, the function integration of protection, control, measurement and automation functions continuously in all SIPROTEC 4 relays offers you the solution to fulfil all secondary technical tasks with one relay per feeder. This saves investment costs, cuts installation costs and increases the availability.
Our Portfolio (10)
7SJ46
Numerical Overcurrent Protection Relay
- Description
- Function overview
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.
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
