[synchronisierfunktion-arbeitsbereichfuerspgund-freq-150502-kn, 1, en_GB]
Figure 2-34
Operating range under synchronous and asynchronous conditions for voltage (U) and
frequency (f)
Synchrocheck
Addresses 6150 dU SYNC U2>U1 (permissible voltage difference, if U2 is greater than U1) and 6151 dU
SYNC U2<U1 (permissible voltage difference, if U2 is smaller than U1) can be used to set the permissible
voltage differences asymmetrically. The availability of two parameters enables an asymmetrical release to be
set.
The parameters 6152 df SYNC f2>f1 (permissible frequency difference, if f2 is greater than f1) and 6153
df SYNC f2<f1 (permissible frequency difference, if f2 is smaller than f1) determine the permissible
frequency differences. The availability of two parameters enables an asymmetrical release to be set.
The parameters 6154 dα SYNC α2> α1 (permissible angle difference, if α2 is greater than α1) and 6155 dα
SYNC α2< α1 (permissible angle difference, if α2 is smaller than α1) confine the operating range for
synchronous switching. The availability of two parameters enables an asymmetrical release to be set.
The preset parameters were selected for the application “Enabling for manual synchronisation of a generator”
and correspond to the parameters as for asynchronous conditions. The angle setting relates to the admissible
angle error which a generator still tolerates without excessive stress. Setting is to be done in accordance with
generator. 10° is a typical value.
With frequency difference of 0.1 Hz at 10°, the time interval to the instant of synchronization is 10°/0.1 Hz ·
360° = 280 ms. Within this time period the manual close command should occur. The operating time of the
device 7VE61 and 7VE63 is approx. 10 ms. With an assumed circuit breaker closing time of 60 ms, approx. 2.5°
before the synchronizing instant the manual ON command must occur.
With the 1
1
/
2
channel version of the 7VE61, the synchrocheck function operates as an enable criterion and is
set coarsely in the monitoring limits. Therefore the dependences for the setting values of the forward angle
are Δα, permissible frequency difference Δf and circuit breaker closing time T
E
according to the following
formula:
[abhaengigkeit-alpha-f-te-170603-kn, 1, en_GB]
Functions
2.2 Paralleling Functions
SIPROTEC 4, 7VE61 and 7VE63, Manual 69
C53000-G1176-C163-3, Edition 10.2017
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