EDR-5000 IM02602007E
Reconnection
The reconnection function after a mains decoupling is based on the requirements of the Transmission-Code (TC2007)
[1]
and the German directive „Erzeugungsanlagen am MS-Netz“
[2]
.
To monitor the reconnection conditions after a mains decoupling, a reconnection function has been implemented to the
decoupling function additionally.
Mains voltage (phase to phase) and frequency are the main criteria for reconnection. Always the mains side voltage at
the generator circuit breaker has to be evaluated.
The reconnection function is only one of the system functions for mains decoupling and return synchronizing.
Triggering of the reconnection function is only possible after a trip of the first timer element (decoupling of a power
generation unit).
After a trip of the circuit breaker at the PCC by the decoupling function, reconnection has to be done manually.
Danger of asynchronously reconnection:
The reconnection function does not substitute a synchronizing device.
Before connecting different electrical networks, synchronism has to be secured.
After decoupling by the
Q->&V<
module or other decoupling functions, like
V</V<<, V>/>>, f</>
the reconnection
release signal for reconnection the circuit breaker of the power generating unit will be blocked for a preset time interval
(default setting 10 min.).
This is to wait until all switching operations are completed. The reconnection release will only be issued, when the
thresholds for mains voltage and frequency are met after elapse of the mains recovery time.
Release logic for the PCC circuit breaker
If the PCC circuit breaker has tripped the reconnection has to be done manually. A special blocking logic is not
necessary.
If a power generating unit should be reconnected by the generator circuit breaker the
voltage transformers have to be installed at the mains side of the circuit breaker.
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