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Lodestar FM-DFI

Technical characteristics of Lodestar FM-DFI

PARAMETER	VALUE
Mains voltage level, kV	6-36
Recorded fault types
Identification of two-phase and three-phase faults	+
Identification of single-phase PtG	+
Determination of singlephase PtG direction	+
Fault detection on line switch-on (single-phase PtG, PtP)	+
Minimum zero-sequence current for single-phase PtG registration), А	0.5
General description of devices
Visual fault indication	LED indication LCD indicator
Power supply
AC or DC supply voltage, V	100-240 or ~100-270
External backup power supply, V	-
Communication interface	RS-485 Ethernet
Communication protocol	Modbus IEC 608 70-5-104
Operation monitoring	visual relay output RS-485 Ethernet
Measurement accuracy
Current, %	3
Voltage, %	1 when using a voltage transformer (VT) 3 when using capacitive dividers
Active, reactive and apparent power,%	3
Frequency, %	1
Mounting
Mounting	switchboard mounting / wall-mounting
External transducer
Сurrent sensor	Rogowski coil 3 to 30 in multiples of 3
Voltage transformer (VT)	standard voltage transformer capacitive divider
Operating temperature range, °С	from –40 to +70
IP rating of the feeder monitor	IP 60

Lodestar FM-DFI is a universal device for registration and analysis of emergency processes that combines the functions of selective detection of line damage in networks of any topology and type of neutral and measurement of basic parameters of electricity. The Device is designed to detect the fact and determine the direction of phase-tophase short-circuits, phase-to-ground fault in overhead and cable power distribution lines of 6-36 kV. Lodestar FM-DFI monitors the minimum voltage and extra voltage with indication of alarm signals.

Benefits:

Directional fault detection – detects and identifies the direction of occurred earth faults.
Flexible power supply – auxiliary power, line supply, or constant voltage.
High measurement accuracy – precise fault detection and monitoring.
Flexible SCADA integration – supports IEC 60870‑5‑104 over Ethernet; Modbus over RS‑485.
Large event memory – stores more than 200 fault events for post‑fault analysis.

Lodestar FM-DFI

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