(+44) 1306 743355

6. OMNI- FI Multi Functional Electronic Fault Indicator for Closed Ring Cable Networks at 11kV and 33kV Features Directional Overcurrent Directional Earth Fault Overcurrent and Earth Fault Integral Re Charging Cell LCD Alarm Display with backlight Infra Red programming Telecom Alarm Output and RS232/485 interface Operates from Core Balance CT's, " phase CT's, or volt drop on cable sheath Benefits No life time costs No maintenance Simple to install OMNIF-FI is the latest development in the Bowden range of electronic earth fault indicators and offers the technological advancement necessary to meet modern day power system fault indicator requirements. The OMNI-FI is a programmable Directional Earth Fault and Overcurrent Indicator. It is built into a small polycarbonate enclosure that is rated to IP67 and the electronics are environmentally protected internally by a polyurethane encapsulant. Power source the OMNI-FI operates from stored energy derived from the LV 'Reference' voltage supply. During System Fault conditions this stored energy provides sufficient power for Directional Fault Indications and Alarm Outputs until the LV supply is restored. Fault Indications these are provided by an LCD that gives a representation of fault direction on a circular display that is split into 8 sectors. When in the 'Alarmed' state one of these sectors will change from 'clear' to 'black'. As to which Sector changes to 'black' is determined by the phase relationship of the fault current with the LV Reference Voltage at the instant the fault occurs on the system. Thus, on a 'closed ring' circuit the fault current from one source will cause, say, Sector 1 to indicate by changing from 'clear' to 'black'. Fault Current from the other source will be in the opposite direction and cause a Sector 1800 opposite to indicate 'black' i.e. Sector 4 or 5. The Faulted Section of network is between the two OMNI-EFI's that indicate a 1800 change in the Sectors. Over Current and Earth Fault Indications are given by the appropriate symbol on the LCD i.e. OC RIY/B or EF Both are given if the fault is both. Resetting Indications & Alarms there are three ways of resetting an Alarmed OMNI-FI to the Alert mode. 1. Press 'push-button' reset on front face of OMN I-Fl. 2. Automatic reset after 3 hours. This time is programmable and can be set up to 6 hours. 3. Remote Reset (certain models only) 4. LV reset is optional. The time delay for reset after the supply has been restored is programmable. Specification Trip Current : -50-100a in x steps Trip delay: - 50mS to 1 second (optional settings available to maximum of 6 hours) Reset Time: - 3 hours +/- 1 minute Alarm Indication: - Clear LCD display with backlight for illumination at night Module case: - polycarbonate material case with IP65 seal Electronic Encapsulation: - Poly urethane flexible Encapsulant Temperature range: - 25 to 55 degree C Telecomm relay when fitted: - 3 terminal - common /NO / NC Remote reset terminals: - 6-50 volts ac or dc Core balance CT's must be supplied by Bowdens or be to an equivalent specification

Ian Bowden or Trevor Newman 
Telephone:	(+44) 1306 743355
FAX:	(+44) 1306 876768

Bowden Bros Ltd
Brickworks House, 
Spook Hill, 
North Holmwood,
Dorking, Surrey RH5 4HR
United Kingdom

General Information: info@bowden-bros.com
Sales: sales@bowden-bros.com
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