Sigma plus

Short-circuit and earth fault indicators

Remote monitoring

Voltage detectors / detecting systems

Short-circuiting and earthing devices

Substation accessories

Sigma plus

Short-circuit and earth fault indicator for retrofit

Changeable front panel for phase selective short-circuit or earth fault indication
Bright LEDs
Setting option via DIP switches
Connection of different phase current transformers

Description

This device is ready for retrofit: Change or replace old indicators with the Sigma plus without replacing current transformers already existing in the switchgear.

The Sigma plus features a selection switch which is used to adapt the device to all current transformers.

Equipment set includes:

1 display unit

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Product Highlights

Retrofit solution for old devices without replacing existing current transformers
Can be adjusted to all common Horstmann current transformers
Indication by high-intensity LEDs with a viewing angle of 180 degrees
Load-dependent self-adjustment or fixed setting
Single and double flash mode for operation in radial and ring networks

Your advantages

Quick and easy upgrade of the switchgear
Only replacement of the indicator necessary

Technical Data

Sigma plus
Earth fault detection methods
Earth fault detection methods	Earth short-circuit
Neutral system
Low-impedance/short-term low-impedance earthed	---
Isolated earthed	-
Resonant earthed	-
Short-ciruit trip current
Short-circuit trip current	(100), 200, 300, 400, 600, 800, 1,000 A, self-adjustment
Response delay short-circuit	40, 80, 200, or 300 ms
Indication
Indication	Short-circuit: 3 red LEDs (L1, L2, L3), short-circuit/earth fault: 3 red LEDs (L1, E, L3)
Remote signal
Relay contacts	2
Remote contact	Potential-free permanent or momentary contact (>1 s) Contact capacity: 230 V AC/1 A/62.5 VA max. 220 V DC/1 A/60 W max.
Power supply
Internal power supply	Long-life lithium cell, active flashing time >1,000 h, shelf life ≥20 years AC/DC version: 12 – 60 V DC ±10 %, 110 – 230 V AC ±10 %
CT powered	---
Mechanical data
Housing	Polycarbonate, IP40
Temperature range	-30 to +70 °C