DFI-070 Directional Fault Passage Indicator

DFI-070 Directional Fault Passage Indicator

Application Directional short-circuit and earth-fault indication on compensated or isolated-neutral overhead networks
Network voltage range 6–70 kV
Installation configuration Three phase sensor set with one sensor per phase conductor
Directional method Transient current analysis with capacitive voltage reference / electric-field supervision
Earth-fault sensitivity 2–80 A adjustable, subject to capacitive current and neutral grounding study
Short-circuit pickup 100–1000 A adjustable
Fault direction output Forward / reverse / no direction
Indication LED pattern for direction and fault type
Reset methods Automatic on voltage restoration, timer, local magnetic reset, remote reset via gateway
Communication Low-power radio from sensor heads; RS-485 / Ethernet available only at the gateway
Power supply Long-life lithium cell with optional auxiliary supply for gateway
Protection class IP67
Operating temperature −35 °C…+70 °C
Category:

Description

Directional indication for isolated-neutral and compensated medium-voltage networks

The DFI-070 is a directional fault passage indicator for networks where simple overcurrent indication is not enough. It is intended for feeders with Petersen-coil grounding, isolated neutral operation, distributed generation, or complex bidirectional power flow.

The indicator helps operators determine whether the fault is upstream or downstream of the installation point. This can reduce unnecessary line patrols and improve switching decisions.

Typical applications

  • Directional fault passage indication for compensated networks
  • Separate indication for earth fault and phase fault events
  • Remote reset and event transfer when used with a gateway
  • Feeders where non-directional indicators may be insufficient
Engineering note: Trip thresholds, reset logic, communication architecture, insulation coordination, EMC performance and installation method must be validated against the target feeder, grounding method, protection settings and applicable utility standards before final specification.

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