NOTE
All voltages connected according to the parameterized measuring-point connection type are subjected to
the appropriate Vmin/Vmax test. Therefore, connected phase-to-ground voltages are multiplied by √3 as
the threshold values with reference to the rated voltage (phase-to-phase voltage) must be set.
[lohyster-010415-01.vsd, 1, en_US]
If the Synchronization function is started within the hysteresis, no switching is performed as a result of the
minimum and maximum operating limit (parameters Min. operating limit Vmin and Max. operat.
limit Vmax). If the Synchronization function is started within the voltage operating range and the voltage
exceeds the minimum or maximum operating limit during the synchronization process, selecting can occur in
the area of the hysteresis.
Parameter: Max.durat. sync.process
•
Default setting (_:5071:110) Max.durat. sync.process = 30 s
The parameterized conditions must be fulfilled within this time. If the conditions are not fulfilled, no further
closing release takes place and the synchronization stage is stopped. If this time is set to ∞, the conditions are
checked until they are fulfilled. This is also the default setting. Observe the operating conditions when
defining the time limitation. This must be defined specifically for each system. If 0 or 0.01 s is set, then all
conditions are checked once at the starting time point. Thereafter the process is stopped immediately.
Parameter: Voltage adjustment
•
Default setting (_:5071:126) Voltage adjustment = 1.00
The parameter can be used for correction of amplitude errors, for example, due to indirect measurement (for
example, tap changer).
To apply a transformer between measuring points, the Voltage adjustment parameter is not needed. The
transformer ratios are set for the measuring points and the function will take them into account automatically.
Parameter: Angle adjust. (transform.)
•
Default setting (_:2311:127) Angle adjust. (transform.) = 0
o
Control Functions
8.4 Synchronization Function
1136 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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