Sigma D⁺⁺

Directional short-circuit and earth fault indicator, earth fault detection with 5 detection methods with auxiliary supply

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.

The Sigma D++ provides additional earth fault detection methods for compensated and isolated neutral networks.

For the transient earth fault method only three single-phase current sensors are needed, but auxiliary supply is mandatory. The connection of a summation current sensor is optional.

For all other methods no auxiliary supply is needed, if the load current is >5 A.

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
  • Only 3 single-phase current sensors needed for all earth fault detection methods
  • Earth fault detection with up to five different earth fault detection methods, also in combination
  • „„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
  • Wide-range power supply 24 to 230 V AC/DC
  • 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, transient, cos φ or sin φ, pulse detection

Low-impedance/short-term low-impedance earthed ---
Isolated earthed ---
Resonant earthed ---
Short-circuit trip current

DIP: 200, 300, 400, 600, 800, 2.000 A, Selbstjustierung 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 10 - 500 A
Trip current active current cos ɸ 5 - 200 A
Response delay active current cos ɸ 40 ms - 60 s
Trip current reactive current sin ɸ 5 - 200 A
Response delay reactive current sin ɸ 40 ms - 60 s
Trip current permanent earth fault -
Response delay permanent earth fault -
Trip current pulse detection 1 - 100 A
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 24 - 230 V AC/DC (for IET>)
CT powered ---
Housing

Polycarbonate, IP40

Temperature range -30 to +70 °C
Cable diameter -
  1. Clear indication of fault direction
  2. Phase-selective short-circuit and earth fault indication
  3. Differentiation of short-circuit and earth fault
  4. Easy paramteter setting via USB port
  5. Reverse polarity protected plug-in terminals for quick and easy installation
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