Sigma D++

Short-circuit and earth fault indicators

Remote monitoring

Voltage detectors / detecting systems

Short-circuiting and earthing devices

Substation accessories

Sigma D⁺⁺

Directional fault indicator

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

Description

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

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Product Highlights

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 Data

Sigma D⁺⁺
Earth fault detection methods
Earth fault detection methods	Earth short-circuit, transient, cos φ or sin φ, pulse detection
Neutral system
Low-impedance/short-term low-impedance earthed	---
Isolated earthed	---
Resonant earthed	---
Short-ciruit trip current
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 fault trip current
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 Wattmetric / cosφ / active current	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 pulse detection	1 - 100 A
Measurement accuracy
Phase currents	±3 % (0 – 630 A, resolution 1 A) ±5 % (630 – 1,500 A) ±10 % (1,500 – 2,000 A)
Indication
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
Remote signal
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.
Communication
RS485/Modbus-RTU	-
USB port	---
Voltage coupling
Resistive	-
Capacitive	---
Parameter settings
Manual	---
Remote	-
Software via USB	---
Reset
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	---
Power supply
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	---
Mechanical data
Housing	Polycarbonate, IP40
Temperature range	-30 to +70 °C