About trip assignment

What is the way from the trip signal of a function block to any trip contact? You can find here a short summary about this topic. For significantly more details please visit that link:

50Hz frequency difference is shown under synchronous conditions with the circuit breaker closed

The synchro check, synchro switch function needs a definition about the voltages to be compared. This definition is given by the parameter Voltage Select.

50Hz frekvenciakülönbséget mutat a szinkronellenőrző annak ellenére, hogy a megszakító zárva van

Minimum current for impedance calculation in the distance function

The distance function is based on impedance loop calculation between the phases and phases to the ground. There is a minimum current requirement in order to start an accurate impedance calculation. Th...

Minimum áram feltétel az impedanciakalkulációhoz

Transformer differential protection - testing with earth faults

Vector group of the transformer is YyO, the differential protection function trips by √3 times higher value than expected. What is the reason for it? Protecta uses delta-transformation matrices...

Setting the earth fault compensation factor by secondary injection

The EuroProt+ distance protection function block is using earth fault compensation factors for accurate impedance calculation in case of phase to ground faults. The formula of the factors is as follow...

Zérus sorrendű kompenzációs állandó figyelembevétele szekunder tesztelés során

Az EuroProt+ távolság v&e

Under/overvoltage function does not start at the set limit

Voltage function blocks in configurations for MV networks have phase-to-phase voltages as inputs. The set limit concerns also phase-to-phase voltages. That should be taken into considerations also by ...

Time multiplier unit

The "IDMT" type overcurrent function blocks have the "Time multiplier" parameter. This parameter should not have any unit. Unfortunately in the early EuroProt+ configurations it did have. If your devi...

Are the EuroProt+ devices suitable for linearised current transformers (TPY,TPZ)?

The current transformer modules of the EuroProt+ devices are suitable for measuring the currents from linrearised primary transformers. However, we have not tested the function algorithms with this ty...