Sigma F+E 3 2.0

Short-circuit and earth fault indicators

Remote monitoring

Voltage detectors

Short-circuiting and earthing devices

Substation accessories

Sigma F+E 3 2.0

Short-circuit and earth fault indicator

Highly visible, phase-selective LED fault indication
Differentiation of short-circuit and earth fault
Setting via DIP switch behind front panel
Test/Reset button
Three remote contacts
Push‐in clamps for quick installation

Description

Sigma F+E 3 2.0 is a combined short-circuit and earth fault indicator. Due to the measuring principle the earth fault indication is suitable for low-impedance, solidly and isolated earthed neutral networks.

The current is measured via three single-phase current sensors. This allows phase-selective fault detection and indication.

There are two response criteria for short-circuit detection, fixed response values with response delay or auto-adjustment based on load current.

If the current for the selected response criterion – fixed value or self-adjustment – is exceeded, the fault-affected phase will be indicated by a bright flashing LED and remote contact will be activated. A double flashing LED signals a second fault that has occurred within the reset time, e. g. by an automatic reclose attempt and the remote contact will be reactivated.

Two additional LEDs display the fault type. The red LED I>> signals a short-circuit, the yellow LED IE> signals an earth fault. The L1, L2 and L3 indication fields display the fault-affected phase. In addition, phase-selective (L1, L2, L3) or group-selective (I>>, IE>, I>> and IE>) remote signalling is possible.

For testing and commissioning purposes, the trip current values can be reduced to 10 A without changing the DIP switch settings.

Sigma F+E 3 2.0 AC/DC

This version can be connected to auxiliary supply. If the auxiliary power drops out in the event of a fault, the LED indicator can operate using a back-up capacitor for up to 8 hours.

Equipment set includes:

1 display unit
3 single-phase current sensors

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Product Highlights

Short-circuit and earth fault detection from 3 single-phase current sensors
Phase-selective fault indication
Trip current values: load-dependent self-adjustment or fixed values
Single and double flash mode for operation in radial and ring networks
With auxiliary supply and capacitor storage available in AC/DC version

Your advantages

No false trips due to harmonics
Highly visible LED fault indication
Detection of high-impedance earth faults
Clear fault type indication via LED
Retrofit ready for earth and short-circuit indicators with monitoring/control and fault direction function

Technical Data

Sigma F+E 3 2.0
Earth fault detection methods
Earth fault detection methods	Earth short-circuit
Neutral system
Low-impedance/short-term low-impedance earthed	---
Isolated earthed	---
Resonant earthed	-
Earth fault trip current
Earth short-circuit trip current	20, 40, 60, 80, 100, 120 or 160 A
Response delay earth short-circuit	60, 80, 200, 300 ms
Short-ciruit trip current
Short-circuit trip current	200, 300, 400, 600, 800, 1,000, 2,000 A, self-adjustment
Response delay short-circuit	40, 80, 200, 300 ms
Indication
Indication	Short-circuit: 3 red LEDs (L1, L2, L3), 1 red LED I>>; earth fault: 3 red LEDs (L1, L2, L3), 1 yellow LED IE>
Remote signal
Relay contacts	3
Remote contact	Potential-free permanent or momentary contact Contact capacity: 230 V AC/1 A/62.5 VA max. 220 V DC/1 A/60 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 >900 h, shelf life ≥20 years AC/DC version: back-up capacitor, max. 8 h
External auxiliary supply	AC/DC version: 24 – 230 V AC/DC
CT powered	---
Mechanical data
Housing	Polycarbonate, IP40
Temperature range	-30 to +70 °C