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Sentinel™ EFI-BFZ
User's Manual
2. OVERVIEW
The Sentinel™ EFI-BFZ-50 is one of a family of Earth Fault Indicator (EFI) products that is designed
to assist in the rapid location and isolation of earth faults on high voltage cable networks. The EFI
can be used in radial networks or in openly operated ringed networks. When an asymmetrical
current greater than 50A in a 3-phase cable system is detected an earth fault is indicated by means
of a electromechanical flag indicator. The path of the fault current from the feeding point to the
fault location is marked by the triggered EFI's. The defective conductor segment is located between
the last EFI which has been triggered and the first EFI which is still inactive.
3. FEATURES
• Battery powered
• Electromechanical flag
• Auxiliary relay output contact
• Remote indication driver
• Split-core current sensor
• 50A nominal trip
• 50ms minimum fault duration
• Manual test and reset facility
• IP65 environment protection
• Rugged and reliable electronics
• ISO9001:2000 based quality assurance
• Electromagnetic compatibility
4. INSTALLATION
4.1 CURRENT SENSOR
The Sentinel™ current sensor consists of a flexible steel core which is wrapped around the three-
phase system to be monitored and fastened tightly in place with adjustable cable-ties. The current
sensor is normally shipped fastened in a closed position. The cable-ties are released by depressing
the small ratchet on the head while bending back the tail. The current sensor should not encircle
the cable earthing as well. Instead, the cable earthing should bypass the current sensor.
The current sensor is available in three different sizes depending on whether it is to be applied to
an installation consisting of a multi-core cable or a system comprising of three single-core cables.
Version 3.2
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