EFI-036 Sensitive Earth Fault Indicator

EFI-036 Sensitive Earth Fault Indicator

Application Sensitive earth-fault indication for medium-voltage cable and overhead sections
Network voltage range 6–36 kV
Sensor inputs Core-balance CT or three phase CT inputs with residual-current calculation
Earth-fault pickup 1–40 A adjustable
Short-circuit pickup 200–1000 A adjustable
Detection principle Residual current evaluation with voltage-presence supervision
Indication Separate LEDs for earth fault and short circuit
Outputs Two dry contacts for RTU, remote indicator, or local alarm panel
Auxiliary supply 24–110 V DC with internal lithium backup for indication memory
Reset methods Manual, timer, remote input, voltage restoration
Mounting Panel, compact substation, pole cabinet, or cable-overhead transition cabinet
Protection class IP54 panel; IP65 in outdoor cabinet
Operating temperature −30 °C…+70 °C
Category:

Description

Cabinet-mounted earth-fault indicator for low-current ground-fault applications

The EFI-036 is a sensitive earth fault indicator for medium-voltage distribution networks where low earth-fault current must be detected reliably. It can be used in compact substations, pole cabinets, and transition points between cable and overhead sections.

The device is intended to support faster localization of phase-to-ground faults while reducing nuisance indication from normal switching transients and load variations.

Typical applications

  • Low-current earth-fault detection for sensitive networks
  • Separate relay outputs for RTU integration
  • Cable-overhead transition points
  • Configurable reset logic for local and remote operation
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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