MLFI-69X Line fault indicatorA monitoring device for detecting earth faults in power distribution lines. Also includes a current value monitoring function.

High voltage earth fault monitoring device

FEATURES

・It can be monitoring between long time periods because it is powered directly from the power distribution line. A lithium battery is included as standard equipment as spare power source for operation in the event of a ground fault.

・For monitoring operation, it will be necessary to connect the DCU.
The DCU equipped the long distance communication IEC101/IEC104/DNP3.0/Modbus to connect with SKADA system.

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Electrical characteristics
Short-circuit Trip(Phase to Phase)/Measurement Current	50~1200A adjustable, 1A step, 150A default
Accuracy	0A~300A ±3A 300A~800A ±1%
Earth-fault Voltage Drop (Phase to Ground)	Adjustable: 1% step, 30% default
Earth-fault Response Delay	Adjustable: 1 second step, 30s default

Physical specifications
Protection Class	IP68
Operation Temperature Range	-40~+70℃
Power Supply	Main: Automatic power supply from distribution or transmission lines Sub: Lithium battery type AA 3.6V / 9Ah(Battery Life 10 years), replaceable
Weight	Indicator: Approx. 600g/1ea DCU: Approx. 3.6Kgs/1ea
Dimensions	Indicator: Width: 93mm Height: 170mm DCU: Width:200mm Height:300mm Length:148mm
Applied cable diameter	6mm~42mm
Blinking Frequency	10 per minute, adjustable
Use voltage	General: 38kV Customizable: 44/69/110kV
Withstand current	31.5KA/4s

Other specifications
Indication Unit Reset	1. manual by magnet. 2. remote reset through SCADA system 3. time reset: adjustable, 1 second step, 24h default, max. 48h 4. Auto delay reset after repower, 1 second step, 30s default max 5min, only for permanent fault
Complied standard	According to IEEE495-2007
Communication	433MHz from indicators toDCU 2.5G/3G/4G from DCU toSCADA
Communication Protocol	Indicator to DCU: private DCU to SCADA: IEC101, IEC104, DNP3.0，Modbus

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