Opto F+E 3.0

Short-circuit and earth fault indicators

Remote monitoring

Voltage detectors / detecting systems

Short-circuiting and earthing devices

Substation accessories

Opto F+E 3.0

Short-circuit and earth fault indicator

1. Phase-selective short-circuit indication

2. Separate earth fault indicator

3. Setting options via DIP switches

4. Connection of fibre optic cables

Description

The Opto F+E 3.0 device is a combined short-circuit and earth fault indicator. It is designed to detect, display and remotely indicate short-circuit currents and earth faults in medium voltage distribution networks. The indicator unit can be used in all medium voltage switchgear installations.

Fibre optic cables provide electrical isolation between the current transformers, mounted on cable/busbar, and the display unit when transferring signals. Due to its measuring principle, the earth fault indication is suitable for low-impedance or solidly earthed neutral networks as well as for radial or open ring networks.

The current transformers (CT) have an integrated trip threshold detection capability. When the pre-set trip current is reached or exceeded, light pulses will be emitted. A fibre optic cable is used to transmit these light pulses from the CT to the Opto. Phase-selectively operated red LEDs start flashing.

After the first tripping incident (e. g. in radial systems) the LEDs begin a phase-selective flash rhythm of: flash / pause / flash.

A second tripping (e. g. ring operated network with auto-reclosing) is indicated by flashing LEDs of the fault-affected phases in a flash-flash / pause / flash-flash rhythm.

Equipment set includes:

1 display unit (plug-in or surface mount housing)
3 phase current transformers
1 summation current sensor
4 fibre optic cables

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Product Highlights

Fibre optic cables for electrical isolation between indicator and current transformers
High-intensity LED indication
Single and double flash mode for operation in radial and ring networks
Remote indication via relay contact
Current transformer retrofit ready

Your advantages

Installation on bare cables and busbars
New fault detection within reset time

Technical Data

Opto F+E 3.0
Earth fault detection methods
Earth fault detection methods	Earth short-circuit
Neutral system
Low-impedance/short-term low-impedance earthed	---
Isolated earthed	-
Resonant earthed	-
Short-ciruit trip current
Short-circuit trip current	400, 600, 800 or 1,000 A
Response delay short-circuit	40, 60, 80, 100, 200, 300 or 500 ms
Earth fault trip current
Earth short-circuit trip current	10, 20, 40 or 80 A resp. 40, 80, 120 or 160 A
Response delay earth short-circuit	60, 100, 200 ms
Indication
Indication	Short-circuit: 3 red LEDs (L1, L2, L3), earth fault: 1 yellow LED, flashing period 2 s, double flash sequence 0.3 s with flashing period 3 s
Remote signal
Relay contacts	2
Remote contact	Potential-free permanent or momentary contact Contact capacity: 380 V AC/5 A/1250 VA max. 220 V DC/5 A/150 W max.
Reset
Manual reset	---
Remote reset	---
Automatic time reset	---
Reset via interface	-
Reset on current restoration	-
Reset on voltage restoration	---
Reset on restoration of auxiliary supply	---
Reset via Explorer Software	-
Power supply
Internal power supply	Long-life lithium cell, active flashing time >1,000 h, shelf life ≥20 years
External auxiliary supply	12 – 110 V DC ±10 % or 24 – 60 V AC (±10 %), 50 – 60 Hz (optional)
CT powered	-
Mechanical data
Housing	Polycarbonate, IP40 (plug-in housing), IP65 (surface mount housing)
Temperature range	-30 to +70 °C