shortcircuit ind. set SIGMA 2,0 of 37-1111-101 + 3xCT 49-6024-010

Sigma 2.0 is a phase selective short circuit indicator and is used to record, display and remotely report short circuit currents in medium voltage networks.

The current measurement is carried out via three single-phase current sensors. By using these sensors, a subsequent conversion to a higher generation of indicators is possible at any time - without changing the sensors.

You can choose between two pick-up criteria for short-circuit pick-up. Partly the excitation takes place via a fixed response value and the duration of the set response time delay and partly via self-adjustment and a defined factor depending on the operating current.

If the current of the selected response criterion - fixed response value or self-tuning - is exceeded, the LED for the relevant phase flashes and the remote signal switch is activated. If another stimulus occurs within the reset time, e.g. B. in the event of an automatic restart, this is signaled by a double flashing display and the remote signal switch is activated again.

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