The SIA relays family, composed of SIA-C, SIA-E and SIA-D, are designed to protect the secondary transformation and distribution centres of electrical grids. The protection features include protection against instantaneous and inverse time overcurrent (for the phases and the neutral) as well as an external trip support (temperature, pressure, etc.) depending on the model.
The protection functions can be enabled by using both the front panel and the communications link to the SICom programme. Combining the settings and IEC curves available allows for precise coordination with other equipment.
The combination of the available IEC curves and settings allows a precise combination with other equipments.
One of the outstanding features of the SIA-C and SIA-E is the use of the operating current itself for self-powering.
This means that maintenance of the transformation and distribution centres is reduced. Neither batteries, chargers, nor any other external power elements are required.
Even more, one advantage over other equipment available on the market facilitates the start-up of installations and the carrying out specific operations in adverse conditions. All models can be powered from an external battery, allowing us to guarantee complete operation of the equipment, including tripping due to any faults that