Sigma D
Direction fault indicator
The Sigma D is a combined short-circuit direction and earth fault direction indicator. The current is measured via phase current sensors. The measuring voltage can be tapped via integrated voltage test systems (Wega series), via HR / LRM interfaces or probes with capacitive decoupling.
The Sigma D+ and Sigma D++ are available as universal devices for all neutral point treatments. The variants differ in the design of the earth fault wiper method.
Product features
- CT powered directional short-circuit and directional earth fault indicator for all distribution networks / neutral point treatments
- Sigma D can also be used in isolated networks.
- Independent, fully automatic voltage calibration
- Simple and flexible parameterization via DIP switch or USB
- Event memory for fault evaluation
- LED status display, multicolor
- Remote signalling via freely programmable relays
- Sigma Explorer Software: Commissioning and parameterisation via front accessible USB port
Phase-selective short-circuit and earth fault indication
Clear fault direction indication
Differentiation between short-circuit and earth fault
Status indicator LED
Your added value
- Immediate fault direction detection
- No auxiliary voltage required
- Fast commissioning and parameterization
- On-site monitoring with USB and notebook
Reversible plug-in terminals for quick and easy installation
Connection for voltage coupling (Wega)
Technical data
| Feature | Sigma D |
|---|---|
| Short-circuit indicator | ✅ |
| Earth fault indicator | ✅ |
| Earth fault detection method | Earth short-circuit |
| I>> short-circuit trip current | DIP: 200, 300, 400, 600, 800, 2,000 A, self-adjustment (200 – 2,000 A)SW: 50 – 2,000 A (1 A steps) |
| tI>> Response delay | DIP: 40, 80 ms; SW: 40 ms – 60 s |
| IES> / IES>> Earth fault trip current | DIP: off, 20, 40, 60, 80, 100, 120, 160 A; SW: 10 – 1,000 A (1 A steps) |
| tIE> Transient method, trip current | DIP: 80, 160 ms; SW: 40 ms – 60 s |
| IET> Transient method, trip current | – |
| IEP> Active current cos φ | – |
| IEQ> Reactive current sin φ | – |
| tIEP> / tIEQ> Response delay | – |
| ΔIE> Response values for pulse localisation (clock stroke) | – |
| Measuring accuracy phase currents | 3 % (0 – 630 A, resolution 1 A)5 % (630 – 1,500 A)10 % (1,500 – 2,000 A) |
| Indication |
|
| Remote signaling / communication | 4 potential-free relay contacts, freely configurable |
| Parameterization |
|
| Remote signaling contact | 4 potential-free permanent or momentary contacts (1 s), NC or NO Contact capacity: 230 V AC / 1 A / 62,5 VA max.; 220 V DC / 1 A / 60 W max. |
| Voltage calibration | Manual / Automatic |
| Reset |
|
| CT powered | ✅ |
| External auxiliary voltage | – |
| Internal power supply | Long-life lithium cell; service life ≥20 years |
| Summation current sensor | – |
| Housing | Polycarbonate, IP40 |
| Temperature range | -30 °C to +70 °C |
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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.
Other short-circuit and earth fault indicators
Sigma D+
- Phase-selective short-circuit indicator with direction indicator
- Earth fault location method for all neutral point treatments in MV networks
- Earth fault detection with 5 detection methods with summation current sensor
Sigma D++
- Phase-selective short-circuit indicator with direction indicator
- Earth fault detection methods for compensated and isolated neutral networks
- Earth fault detection with 5 detection methods with auxiliary power supply
Sigma DM
- OLED display for good readability in all lighting conditions
- Indication of measured values and configuration via the display
- Quick and easy to operate rocker switch