Sigma L series
Short-circuit and earth fault indicator with communication via LoRaWAN
The Sigma L series offers the option of transmitting data via the 868 MHz radio frequency using the LoRaWAN protocol. The transmission is secured for 1 minute after the auxiliary voltage is removed in the event of an error, so that the data can be transmitted securely to the LoRaWAN gateway. The current measurement of the Sigma 2.0 L series is carried out via three single-phase current sensors. This enables phase-selective fault detection and display. For short-circuit excitation, you can choose between two excitation criteria – fixed response values with response delay or self-adjustment depending on the operating current. If the current of the selected response criterion – fixed response value or self-adjustment – is exceeded, the LED of the relevant phase flashes and the remote signaling contact is activated. If a second excitation occurs within the reset time, e.g. due to automatic reclosing, this is signaled by a double flashing display and the remote signalling contact is activated again. For testing and commissioning purposes, the current response values can be reduced to 10 A without changing the DIP switch settings. Two versions are available with separate earth fault detection for low-impedance or rigidly earthed medium-voltage systems.
Sigma L
Short-circuit indicator, whereby the display fields L1, L2 and L3 indicate the fault phase-selectively.
Sigma F+E L
Short-circuit and earth fault indicator, whereby the display fields L1, L2 and L3 indicate the fault phase-selectively. The earth fault is calculated separately and displayed as a single-pole fault.
Sigma R+D 3 L
The red LED I>> indicates a short circuit, the yellow LED IE> indicates an earth fault, while the display fields L1, L2 and L3 indicate the fault phase-selectively. In addition, the Sigma F+E 3 L has a phase-selective (L1, L2, L3) or group-selective (I >>, IE>, I>> and IE>) Remote reporting via LoRaWAN.
Product features
- Short-circuit and earth fault detection from just three single-phase
current sensors - Phase-selective fault display
- Short circuit: load-dependent self-adjustment or fixed
response values - Single and double flashing mode for beam and ring nets
- With auxiliary voltage connection and capacitor memory for error display
- Remote data transmission via LoRaWAN radio module
Setting via DIP switch behind front panel
Bright, phase-selective short-circuit LED display
Test/reset button
Auxiliary voltage Uaux available
Your added value
- Cost-effective option for data transmission
- Secure communication in a public wireless network
- Clearly visible LED error display
- Detection of low-resistance earth faults
- Transformer power supply for on-site fault indication
Connection of telecommunication contacts
Push-in clamps for quick installation
Technical data
| Sigma L | Sigma R+D L | Sigma R+D 3 L | |
|---|---|---|---|
| Short-circuit indicator | ✅ | ✅ | ✅ |
| Earth fault indicator | ✅ | ✅ | ✅ |
| Earth fault location method | Earth short circuit | Earth short circuit | Earth short circuit |
| I>> Response values Short-circuit current |
200, 300, 400, 600, 800, 1,000, 2,000 A Self-adjustment depending on the operating current (IB): IB < 100 A → I>> = 400 A, IB > 100 A → I>> = 4 x IB |
200, 300, 400, 600, 800, 1,000, 2,000 A Self-adjustment depending on the operating current (IB): IB < 100 A → I>> = 400 A, IB > 100 A → I>> = 4 x IB |
200, 300, 400, 600, 800, 1,000, 2,000 A Self-adjustment depending on the operating current (IB): IB < 100 A → I>> = 400 A, IB > 100 A → I>> = 4 x IB |
| tI>> Response delay | 40 ms, 80 ms | 40 ms, 80 ms | 40, 80, 200, 300 ms |
| IE> Response values Earth fault current |
20, 40, 60, 80, 100, 120, 160 A | 20, 40, 60, 80, 100, 120, 160 A | 20, 40, 60, 80, 100, 120, 160 A |
| tIE> Response delay | 40, 80 ms | 40, 80 ms | 40, 80, 200, 300 ms |
| Response tolerance | ±5 % (0 – 630 A) ±10 % (>630 A) |
±5 % (0 – 630 A) ±10 % (>630 A) |
±5 % (0 – 630 A) ±10 % (>630 A) |
| Display | 3 red LEDs: Short circuit: 2 or 3 poles (L1, L2, L3) |
3 red LEDs: Short circuit: 2 or 3 poles (L1, L2, L3) |
3 red LEDs: Short circuit: 2 or 3 poles (L1, L2, L3) |
| Remote signaling / communication | Radio frequency: 868 MHz with LoRaWAN protocol | Radio frequency: 868 MHz with LoRaWAN protocol | Radio frequency: 868 MHz with LoRaWAN protocol |
| Reset |
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|
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| Converter power supply | ✅ | ✅ | ✅ |
| External auxiliary voltage | 24 – 230 V AC/DC | 24 – 230 V AC/DC | 24 – 230 V AC/DC |
| Internal supply | Back-up capacitor, max. 8 h after auxiliary voltage failure | Back-up capacitor, max. 8 h after auxiliary voltage failure | Back-up capacitor, max. 8 h after auxiliary voltage failure |
| Housing | Polycarbonate, front IP40, terminals IP20 | Polycarbonate, front IP40, terminals IP20 | Polycarbonate, front IP40, terminals IP20 |
| Temperature range | -30 °C to +70 °C | -30 °C to +70 °C | -30 °C to +70 °C |
All important documents for the device
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Matching articles
PERFECT MATCH
Here you will find the matching equipment set and accessories for this item. All components are technically matched to each other and guarantee optimum functionality. For customer-specific requirements and individual offers, please contact our sales department.
Equipment set
- 1 Sigma L variant display unit
- 3 phase current sensors
- Antenna (mandatory for all three device variants)
Other short-circuit and earth fault indicators
Sigma R+D 3 2.0
- Clear error type display with differentiated LED display
- Optional, group-selective remote signaling
- Error display without direction indication and readability on site thanks to high-contrast OLED display
Sigma D+
- Phase-selective short-circuit indicator with direction indicator
- Earth shot location method for all neutral point treatments in MV networks
- Earth fault detection with 5 detection methods with total current sensor
Sigma D++
- Phase-selective short-circuit indicator with direction indicator
- Earth shot location method for all neutral point treatments in MV networks
- Earth fault detection with 5 detection methods with auxiliary power supply
Sigma DM
- OLED display for good readability in all lighting conditions
- Display of measured values and configuration via the display
- Quick and easy to operate rocker switch