Protective Elements
PCC in HV systems
According to VDE-AR-N 4120 a reconnection of a Distributed Energy Resource to the grid is not allowed before the
following conditions are fulfilled: The frequency of the mains/grid has to be between 47.5 and 51.5 Hz and the
voltage between 93.5 and 127 kV (100 kV level). Voltage and frequency have to be within their limits for minimum 5
minutes.
Reconnection Conditions:
Before reconnecting a power generation unit it has to be secured that mains voltage has been stabilized sufficiently.
According to VDE AR-N 4120 a corresponding remote signal has to be available and also the voltage at the
Distributed Energy Resource too.
Set the parameter
»Reclosure Release Cond«
in the menu [Protection Para\Set[x]\Intercon-
Prot\ReCon\Release Para] to »Both
«
. The required parameter settings are described in the chapter
»General
Settings«
.
Set the blocking signals in the menu
[Protection Para\Set[x]\Intercon-Prot\ReCon] the trigger (decoupling) signals which start the mains recovery
time (OR logic).
Select a sufficiently long recovery time
»t-Release Blo«
in the menu
[Protection Para\Set[x]\Intercon-Prot\Reconnection\Release Para]. Reconnection is only possible after this
timer has been elapsed. This timer will be started by the triggers that have to be set in: [Global Para\Intercon-
Prot\Reconnection\Decoupling]. (If it happens that the voltage or frequency values are outside the
permissible ranges before the timer elapses then the timer is automatically restarted.)
In the menu [Protection Para\Set[x]\Intercon-Prot\Reconnection\Release Para] the frequency and voltage
range to be met for reconnection can be set.
Set the parameters for the release of the voltage for the reconnection as described in section “Voltage
release by (self-) measured voltage values AND via remote control connection from the PCC”.
If one-minute average voltages are required for release condition, the (self-) measured voltage can use the average
voltages from the Statistics module:
Set the parameter
»Measuring method«
in the menu [Protection Para\Set[x]\Intercon-Prot\ReCon\Release
Para] to »Vavg
«
. Set the parameters for the release of the voltage for the reconnection as described in
section ”Configuration of the Voltage Based Average Value Calculation”.
972 MCDGV4 DOK-HB-MCDGV4-2E
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