Reyrolle 7SR46: CT-powered overcurrent protection

Why Reyrolle 7SR46?

Reyrolle 7SR46 is a CT-powered overcurrent protection relay with the option for an external auxiliary power supply. This panel-mounted numeric relay provides both definite-time and inverse-time overcurrent and earth-fault protection for distribution grid applications such as cable networks and Ring Main Units (RMU). Reyrolle 7SR46 integrates with SCADA systems. Its compact, easy-to-use front panel includes navigation keys, an LCD and USB port.

10 fault records
100 event records
Password protection
Instantaneous and delayed overcurrent protection functions
High sensitivity: Trip-ready at 80 % of Ismin (1-phase) and 40 % of Ismin (3-phase)
Parametrization via keypad and/or via Reydisp Evolution PC software
Internal lithium battery back-up
Real-time clock
Self-monitoring including battery condition monitoring
Suitable for specific wide-measuring range CTs (class 5P80)

Key benefits

Protection

50 instantaneous/51 time-delayed overcurrent — phase
50 line check/switch onto fault
50N instantaneous/51N time-delayed earth fault — derived

Supervision

81HBL2 inrush-current detection

Ancillary

49T high-speed trip

Featured capabilities

Hardware

- 3 current transformers inputs

- 2 binary inputs, 2 binary outputs

- 1 pulsed output

- 1 external flag indicator output

- 1 external trip initiation input

- RS-485 serial interface

- Universal power supply range DC 24-240V & AC 60-240V

User interface

- 16 character x 2 line backlit LCD

- Navigation/operation keypad

- 4 LEDs for local annunciation; 2 programmable LEDs

- USB interface to set relay and download event/fault records

- Rear RS-485 port for Modbus RTU, IEC 60870-5-103