EDR-5000 IM02602007E
PCC in MV systems
It is required that the PCC and also the DER are equipped with a decoupling
device.
It is required that the decoupling device of the PCC controls the PCC's circuit
breaker.
It is required that the decoupling device of the power generation (DER) unit
controls the generator circuit breaker.
The German regulation „Erzeugungsanlagen am MS-Netz“ (BDEW, Issue June 2008
[2]
) recommends to have a time
delay (some minutes) between mains voltage recovery and reclosure after a trip of a decoupling system as a result of a
mains failure. This is to wait until all switching operations are completed. Usually this is the case after 10 minutes. A re-
connection of the DER is only permitted, when the mains voltage is >95% of Vn and the frequency is in the range of
47.5 Hz to 50.05 Hz.
Set the blocking signals in the menu
[Global Prot Para\Intercon-Prot\ReCon\Decoupling] which start the mains recovery time
(OR logic).
Select a sufficiently long recovery time »t1-Release Blo
«
in the menu
[Protection Para\Set[x]\ReCon\Release Para]. Reconnection is only possible after this timer has been elapsed
(This time stage will be triggered by the signals that are assigned in menu [Global Para\Intercon-
Prot\Reconnection\Decoupling]).
In the menu [Protection Para\Set[x]\ReCon\Release Para] the frequency and voltage range to be met for
reconnection can be set.
Set the parameters for the release of the voltage as described in the corresponding sections for the voltage
release.
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