PROGRAMMABLE EARTH FAULT  OR  OVERCURRENT  AND EARTH FAULT INDICATION WITH COMMS OPTION.

SIGMA offers a flexible solution to CFI requirements. As a modular  device it can be built up and priced according to client’s  needs.  It  may have a single Earth Fault card, or add three phase cards to give it an earth fault and overcurrent capability.  It is programmable for all key functions, including C/T compatibility.  Pre-loaded, or selectable profiles, set up for the client’s preferred settings  ensures minimal  programming intervention.  Load current monitoring is available from LV powered SIGMAs and an integrated communications option may be added  for GSM or GPRS remote reporting of alarms and status.

SIGMA may be  used with conventional resin cast C/Ts, or with Bowdens flexible band C/Ts which are designed to fit into the cable box of an RMU.

SIGMA  – FEATURES

• Overcurrent & Earth Fault
• Programmable for all key functions.
• Powered from 10 year Lithium battery or LV Mains or RTU supply.
• LV Reset or LV Sensor reset/monitoring
• Load Current monitoring.
• Modbus serial interface  for RTU.
• Optional  GSM /GPRS comms module.
• C/T matching feature for compatibility with all C/Ts.
• Alarm relay outputs.
• Band sensor C/T or Cast Resin C/T.