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Sigma 2.0

The Sigma 2.0 is a phase-selective short-circuit indicator. It is designed to detect, display and remotely indicate short-circuits in medium voltage distribution networks. The current is measured via three single-phase current sensors. By using the new sensors retrofit to more advanced indicator series is possible at any time – without changing the sensors.

Short-circuit indicator

Product Features

  • Short-circuit indicator for all medium voltage networks
  • Phase-selective fault indication
  • Trip current values: load-dependent self-adjustment or fixed values
  • Single and double flash mode for operation in radial and ring networks
  • With auxiliary supply and capacitor storage available in AC/DC version

Your advantages

  • No false trips due to higher harmonics
  • Highly visible LED fault indication
  • Retrofit ready for earth and short-circuit indicators with monitoring/control and fault direction function

The Sigma 2.0 is a phase-selective short-circuit indicator. It is designed to detect, display and remotely indicate short-circuits in medium voltage distribution networks.

The current is measured via three single-phase current sensors. By using the new sensors retrofit to more advanced indicator series is possible at any time – without changing the sensors.

There are two response criteria for short-circuit detection, fixed response value with response delay or auto-adjustment based on load current.

If the current for the selected response criterion – fixed value or self-adjustment – is exceeded, the fault-affected phase will be indicated by a bright flashing LED and remote contact will be activated. A double flashing LED signals a second fault that has occurred within the reset time, e. g. by an automatic reclose attempt and the remote contact will be reactivated.

For testing and commissioning purposes, the trip current values can be reduced to 10 A without changing the DIP switch settings.

Sigma 2.0 AC/DC
This version can be connected to auxiliary supply. If the auxiliary power drops out in the event of a fault, the LED indicator can operate using a back-up capacitor for up to 8 hours.

Equipment set:

1 Display unit
3 Short-circuit current transformers


Technical Data

Tecnical Data

SIGMA 2.0

Short-circuit indicator

Earth fault detection method Earth short-circuit

I>> short-circuit trip current

  • 200, 300, 400, 600, 800, 1.000 oder 2.000 A, fixed settings

  • Self-adjustment to load current (IL = load current): IL < 100 A ⇒ I>> = 400 A, IL > 100 A ⇒ I>> = 4 x IL, I>> max = 2.000 A

tI>> sesponse delay

40 ms or 80 ms

Accuracy

±15 %

Remote signal/communication 1 Relay contact

Relay contact

Potential-free permanent and momentary contact (1 s), adjustable
Contact capacity:
230 V AC/1 A/62,5 VA max.
220 V DC/1 A/60 W max.

Indication

3 rote LEDs: 3 x Kurzschluss (L1, L2, L3)

Reset

  • By button

  • Automatic time reset: 1, 2, 4, 8 h, adjustable

  • Remote reset

Power supply
  • CT powered

  • Internal power supply: Long-life lithium cell, active flashing time >900 h, shelf life ≥20 years
    AC/DC version: back-up capacitor, max. 8 h

  • External auciliary supply: AC/DC version: 24 – 230 V AC/DC

Housing

Polycarbonate, IP40

Temperature range

-30 to +70 °C

Accessories

Current Sensors

Single-phase current sensor

  • For new installation on bushings
  • For switchgear manufacturer
    • ORMAZABAL GA/GAE, GE
  • Ø 84 mm

Required order data:

For a set you need 3 single-phase current sensors.

more...
49-6025-311
Single-phase current sensor

  • For new installation on bushings
  • For switchgear manufacturer
    • Driescher type MINEX, MINEX C, G.I.S.E.L.A.
  • Ø 84 mm

Required order data:

  • For a set you need 3 single-phase current sensors.


*For screened connectors only. Insulation level: 0,72/3 kV

more...
49-6025-601*
Single-phase current sensor

  • For new installation on bushings
  • For switchgear manufacturer
    • Schneider Electric type FBX
  • Ø 84 mm


Required order data:

  • For a set you need 3 single-phase current sensors.

more...
49-6025-622
Single-phase current sensor

  • Split-core cable-type current sensor
  • For retrofit on insulated cables
  • For conductor 15 – 55 mm Ø
  • cable length 3 m

more...
49-6024-001

Wall-mounted Housings

Wall-mounted housing including earthing bar

  • 290 x 74 x 200 mm (W x H x D)

more...
V49-9001-007-001
Wall-mounted housing including earthing bar

  • 125 x 175 x 125 mm (W x H x D)

more...
V49-9001-004-001
Wall-mounted housing

  • 125 x 75 x 125 mm (W x H x D)

  • Bottom cable entry

more...
49-9001-001
Wall-mounted housing

  • 125 x 75 x 125 mm (W x H x D)

  • Rear cable entry

more...
49-9001-002

Other accessories for short-circuit and earth fault indicators

Disassembly clip

  • For retracting plug-in housings type Alpha, Opto, Earth  and Sigma

more...
49-9090-016
Spring clip

Spring clip suitable for 2 mm front plate thickness (standard)

more...
49-9090-018
Spring clip

Spring clip suitable for 3 mm front plate thickness

more...
49-9090-019

Dimensioned Drawings

Product

Note Item Number

SIGMA 2.0

Item Number37-1111-101

SIGMA 2.0 AC/DC

Item Number37-1121-101


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