Measurement Sequence
In the 2-channel 7VE63 the measurement voltages in the two-channel are evaluated in accordance with two
different measurement procedures. Each measurement procedure operates with its own measurement value
records and calculates the difference between voltages, frequencies and angles using different algorithms.
The first measurement procedure determines the connection time instant in accordance with the angle crite-
rion. If all conditions are fulfilled the closure command
Sync CloseRel 1
is issued. The second measure-
ment procedure determines the connection time instant using the time criterion. If all conditions are fulfilled
the closure command
Sync CloseRel 2
is issued.
The following figure shows the formation of the closure time instant for an asynchronous connection.
Clearly evident is consideration of the circuit breaker operating time, since the closure command was issued
before the synchronizing instant. Both measurement procedures are almost identical. They can however very
somewhat. This is monitored. This means that both procedures must have issued the closure command within
a tolerance range (see also Section “Supervision”).
[ve6-bildung-einschaltzeitpunkt-240303-oz, 1, en_GB]
Figure 2-16
Generation of CLOSE commands from angle criterion and time criterion on asynchronous
connection
The logic CLOSE commands of both schemes are sent to two hardware monitored relays (BO1 and BO2). Via
their in series connected contacts the CLOSE command is sent to the circuit breaker trip coil.
Control and Closure Logic
This section provides an overview of further essential logic components. From the control side the following
procedure is assumed:
2.2.1.11
Functions
2.2 Paralleling Functions
52 SIPROTEC 4, 7VE61 and 7VE63, Manual
C53000-G1176-C163-3, Edition 10.2017
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