Sigma D
The Sigma D is a combined directional short-circuit and directional earth fault indicator for medium voltage distribution networks.
The devices are current sensor powered. The voltage information will be taken from an integrated voltage detecting system (Wega series), from an HR interface or capacitive post insulators.
Equipment set includes:
- 1 display unit
- 3 phase current sensors
- Voltage coupling
- CT powered directional short-circuit and directional earth fault indicator for all distribution networks / neutral point treatments
- The Sigma D can be used in isolated networks with open rings
- Fully automatic voltage calibration
- Easy and flexible parameter setting via DIP switch or USB port
- Event memory for fault evaluation
- Multicolour LED status display
- Remote signalling via freely programmable relays
- Sigma Explorer Software: Commissioning and parameterisation via front accessible USB port
Your advantages
- Immediate detection of fault direction
- No auxiliary supply required
- Fast commissioning and parameterisation
- Monitoring on site with USB and notebook
Technical specifications
Earth fault detection methods | Earth short-circuit |
---|---|
Low-impedance/short-term low-impedance earthed | --- |
Isolated earthed | --- |
Resonant earthed | - |
Short-circuit trip current | DIP: 200, 300, 400, 600, 800, 2,000 A, self-adjustment, SW: 50 - 2,000 A |
Response delay short-circuit | DIP: 40, 80 ms, SW: 40 ms - 60 s |
Earth short-circuit trip current | DIP: off, 20, 40, 60, 80, 100, 120, 160 A SW: 20 - 1,000 A |
Response delay earth short-circuit | DIP: 80, 160 ms SW: 40 ms - 60 s |
Trip current transient method | - |
Trip current Wattmetric / cosφ / active current | - |
Response delay active current cos ɸ | - |
Trip current reactive current sin ɸ | - |
Response delay reactive current sin ɸ | - |
Trip current permanent earth fault | - |
Response delay permanent earth fault | - |
Trip current pulse detection | - |
Phase currents | ±3 % (0 – 630 A, resolution 1 A) ±5 % (630 – 1,500 A) ±10 % (1,500 – 2,000 A) |
Voltages | - |
Indication | Short-circuit: 3 red LEDs (L1, L2, L3), 1 red LED I>>; earth fault: 3 red LEDs (L1, L2, L3), 1 red LED IE>; directional arrows red/green |
Relay contacts | 4 |
Remote contact | 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. |
RS485/Modbus-RTU | - |
USB port | --- |
Binary inputs | - |
Ethernet interface | - |
Resistive | - |
Capacitive | --- |
Manual | --- |
Remote | - |
Software via USB | --- |
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 | --- |
Internal power supply | Long-life lithium cell, active flashing time >900 h, shelf life ≥20 years |
External auxiliary supply | - |
CT powered | --- |
Housing | Polycarbonate, IP40 |
Temperature range | -30 to +70 °C |
Cable diameter | - |
- Clear indication of fault direction
- Phase-selective short-circuit and earth fault indication
- Differentiation of short-circuit and earth fault
- Easy paramteter setting via USB port
- Reverse polarity protected plug-in terminals for quick and easy installation