The intermediate infeed effect explained in RelaySimTest

Описание: The intermediate infeed effect is a phenomenon that occurs in multi-terminal distance protection schemes. For example, the additional current by a third terminal will rise the voltage at the intermediate busbar – this leads to an incorrectly calculated impedance within the protective relay.

The impedance increases and thus the distance protection could detect the fault location too far away and trip in a wrong zone. The protection system will not function as desired and will violate requirements for speed and selectivity. Therefore, it is important for protection engineers to know the effect and handle it correctly.

Modern protective relays use complex algorithms and adapt to network and failures. Simple function tests are often no longer sufficient for testing such relays. Our unique software RelaySimTest covers these new demands with a transient simulation of the primary power system. It can reveal failures created during calculations as well as during setup of the relay or a protection scheme, requiring only a minimum of test steps.

You can find more information on RelaySimTest on our website:
https://www.omicronenergy.com/en/prod...