Stage Synchrocheck
Description
Checking Closing Conditions
[losynche-160311-01.tif, 1, en_US]
Figure 6-71
Closing Conditions for the Synchrocheck Function
With this operating mode, the values ΔV, Δf, and Δα are checked before connecting the 2 parts of the elec-
trical power system. The indication All sync. conditio. OK signals that the setting values (conditions)
have been reached and that the release for closure has been given (see Checking the Closing Conditions,
Closure in chapter 6.4.6 Sequence of Functions).
Every fulfilled condition is signaled individually via the indications Voltage difference OK, Frequency
diff. OK, and Angle difference OK.
If a condition is not fulfilled, detailed information on why the condition is not fulfilled is provided via indica-
tions. If the differential voltage is outside the setting limits, for example, the indication V dif.too
large(V2<V1) is issued. The indication indirectly contains information that the voltage V2 has to be
increased for a successful synchronization.
With the Expanded delta-f options stage type configured and an activated (_:140) Limit dfdiff/dt
for sync. op parameter, the frequency difference rate of change is also checked. If the permissible
frequency change rate (parameter (_:141) Max. value dfdiff/dt syn) is exceeded, the indication
(_:329) dfdiff/dt too large is issued.
6.4.7
6.4.7.1
Control Functions
6.4 Synchronization Function
SIPROTEC 5, High-Voltage Bay Controller, Manual 377
C53000-G5040-C015-9, Edition 11.2017
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