Sigma D
Error direction 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
- Transformer-powered short-circuit direction indicator and earth fault direction indicator for low-impedance networks
- The Sigma D can also be used in isolated networks with open rings
- Independent, fully automatic voltage calibration
- Simple and flexible parameterization via DIP switch or USB
- Event memory for error evaluation
- LED status display, multicolor
- Remote signaling via freely programmable signal relays
- Sigma Explorer software: Commissioning, parameterization and reading out the fault memory via the front USB port
Phase-selective short-circuit and earth fault display
Clear error direction display
Differentiation between short-circuit and earth fault
Status indicator LED
Your added value
- Immediate error direction detection
- No auxiliary voltage required
- Fast commissioning and parameterization
- On-site monitoring with USB and notebook
Reverse polarity protected 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 location method | Earth short circuit |
| I>> Response values short-circuit 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 current response values | DIP: off, 20, 40, 60, 80, 100, 120, 160 A; SW: 10 – 1,000 A (1 A steps) |
| tIE> Response delay | DIP: 80, 160 ms; SW: 40 ms – 60 s |
| IET> Response values earth fault wiper method | – |
| IEP> Response values active residual current cos φ | – |
| IEQ> Response values Reactive current sin φ | – |
| tIEP> / tIEQ>Response delay | – |
| ΔIE> Response values Pulse localization (clock stroke) | – |
| Measuring accuracy phase currents | 3 % (0 – 630 A, resolution 1 A)5 % (630 – 1,500 A)10 % (1,500 – 2,000 A) |
| Display |
|
| Remote signaling / communication | 4 potential-free, freely programmable relay contacts |
| Parameterization |
|
| Remote signaling contact | 4 permanent or wiping contacts (1 s), NC or NO contact Contact rating: 230 V AC / 1 A / 62.5 VA max.;220 V DC / 1 A / 60 W max. |
| Voltage calibration | Manual / Automatic |
| Reset |
|
| Converter power supply | ✅ |
| External auxiliary voltage | – |
| Internal power supply | Long-life lithium cell; service life ≥20 years |
| Sum current sensor | – |
| Housing | Polycarbonate, IP40 |
| Temperature range | -30 °C to +70 °C |
All important documents for the device
Do you need additional information about our device? In our download area you will find all relevant documents such as brochures and product catalogs, technical reports, operating instructions and dimensional drawings (login required). Simply click on the download area to obtain the documents you require.
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 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