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Figure 2-32 Consideration of a phase angle rotation
At address 6124 VT Un1, primary the primary transformer rated voltage of side 1 is entered for correct
primary representation of the measured values. Analog to this the primary transformer rated voltage of side 2
is entered under address 6125 VT Un2, primary.
Address 6126 Unom SECONDARY represents the secondary transformer rated voltage.
Under address 6127 T CLS CMD MIN, sets the duration of the closing command to the circuit breaker. This
must always be greater than the circuit breaker closing time (address 6120); such that the circuit breaker
safely completes the closure and has interrupted closure control circuit with its auxiliary contact. For safety
reasons, the time should not be set longer than necessary.
The default setting of 0.1 s corresponds to common circuit breakers; however, the particular power system
must be checked.
Asynchronous Conditions
With asynchronous systems a connection command is issued by the synchronizing function so that, taking into
consideration the operating time of the circuit breaker (address 6120 T-CB close), the power systems are
coupled when the vectors are in phase. Apart from the circuit breaker closing time (make-time) 6120 T-CB
close 6130 to 6133 for this purpose are relevant.
With parameters 6130 dU ASYN U2>U1 (admissible voltage difference, if U2 is greater than U1) and 6131 dU
ASYN U2<U1 (admissible voltage difference if U2 is less than U1) the admissible voltage differences can be
also set asymmetrically.
To prevented the reactive power loading of the generator after connection from becoming too large, a setting
of 2 % of rated voltage has proven suitable.
Parameters 6132 df ASYN f2>f1 (admissible frequency difference if f2 exceeds f1) and 6133 df ASYN
f2<f1 (admissible frequency difference if f2 is less than f1) restrict the operating range for asynchronous
connection. The availability of two parameters enables an asymmetrical release to be set.
A usual setting value is about 0.1 Hz. This keeps the possible active power compensation within limits on
connection.
Synchronous Conditions
Parameter 6140 SYNC PERMIS. selects whether on undershooting of the threshold F SYNCHRON (see
below) only the synchronism conditions are checked (YES) or under all circumstances the breaker operating
time is to be also considered (NO).
On synchronism of generators this operating mode is to be disabled. The parameter must be at NO. On the
other hand a main application is synchronisation of power systems.
Functions
2.2 Paralleling Functions
SIPROTEC 4, 7VE61 and 7VE63, Manual 67
C53000-G1176-C163-3, Edition 10.2017
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