Opto F+E 3.0 – Short-Circuit and Earth Fault Indicator for Medium Voltage Grids
The Opto F+E 3.0 from HORSTMANN is a combined short-circuit and earth fault indicator designed for medium voltage grids. The device uses fiber optic transmission between current transformers and the display unit to ensure potential isolation. The display shows phase-specific short-circuit indication with three red LEDs and a separate yellow LED for earth faults. Settings for trip current and delay times are adjustable.Technical Overview
- Product: Opto F+E 3.0 (HORSTMANN, item no. 36-0313-001).
- Function: Combined short-circuit and earth fault indicator for medium voltage grids.
- Signal Transmission: Fiber optic connection between current sensors and display unit (potential isolation).
- Display: 3 red phase-specific LEDs for short-circuit, 1 yellow LED for earth fault; flashing period indicated in manufacturer's text.
- Remote Indication: 2 relay contacts (potential-free); contact rating: 380 V AC / 5 A / 1250 VA max.; 220 V DC / 5 A / 150 W max.
- Reset: Push button, automatic time reset (1, 2, 4 or 8 hours), external voltage ≥10 s (activatable via DIP switch) or remote reset.
- Power Supply: Internal long-life lithium cell (active flashing time >1,000 hours, lifespan ≥20 years); external auxiliary voltage optional: 12–110 V DC ±10 % or 24–60 V AC, 50–60 Hz ±10 %.
- Enclosure: Polycarbonate; IP40 (flush-mounted housing), IP65 (surface-mounted housing).
- Operating Temperature: -30 °C to +70 °C.
Typical Applications
- Used to detect, display and remotely indicate short-circuit currents in medium voltage grids.
- Suitable for use in both enclosed and open medium voltage systems.
- Suitable for networks with low-impedance or solidly earthed neutral points as well as for radial or open ring operation.
Specifications
- Short-circuit trip values: 400, 600, 800, 1,000 A (adjustable on phase current sensor).
- Short-circuit delay tI>>: 40, 60, 80, 100, 200, 300, 500 ms (adjustable in the unit).
- Earth fault trip values IE>: 10, 20, 40, 80 A or 40, 80, 120, 160 A (adjustable on summation current sensor).
- Earth fault delay tIE>: 60, 100, 200 ms (adjustable in the unit).
- Display: Phase-specific short-circuit indicator (3 red LEDs), separate yellow earth fault LED; double-flash and single-flash for network types described in manufacturer's text.
- Remote signal: 2 relay contacts, potential-free.
- Optional accessories: External indicator lamp, transformer for DIN rail or screw, optical test equipment, etc. (specified by the manufacturer as matching articles).
Source
HORSTMANN product page (Opto F+E 3.0). Information in this text is based on the manufacturer's product description.
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