Eaton EDR-5000 - Page 734

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 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 reconnection 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
[Protection Para\Set[x]\Q->&V<\Reclosure\Reclosure Trigger] which start the mains recovery time
(OR logic).
Select a sufficient long recovery time »t1-Release Blo « in the menu
[Protection Para\Set[x]\Q->&V<\Reclosure\Reclosure Release Cond]. Reconnection is only possible after this
timer has been elapsed.
In the menu [Protection Para\Set[x]\Q->&V<\Reclosure\Reclosure Release Cond] the frequency range to be met
for reconnection can be set.
For the case, that the reclosure release should be realized via internal measurement values, the mains voltage
threshold »VLL>« can be set in the menu [Protection Para\Set[x]\Q->&V<\Reclosure\Reclosure Release Cond]
(default 0.95 Vn). For reconnection all phase to phase voltages have to be above this threshold. The required
parameter settings are described in the chapter »General Settings« .
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