Synchrocheck; General - Siemens 7SC80 Manual

2.20

Synchrocheck

When connecting two sections of a power system, the synchrocheck function verifies that the switching does
not endanger the stability of the power system.
Applications
•
Typical applications are, for example, the synchronization of a feeder and a busbar or the synchronization
of two busbars via tie-breaker.

General

2.20.1
Synchronous power systems exhibit small differences regarding frequency and voltage values. Before connec-
tion it is to be checked whether the conditions are synchronous or not. If the conditions are synchronous, the
system is energized; if they are asynchronous, it is not. The circuit breaker operating time is not taken into
consideration. The synchrocheck function is activated via address 161 SYNCHROCHECK.
For comparing the two voltages of the sections of the power system to be synchronized, the synchrocheck
function uses the reference voltage V
If a transformer is connected between the 2 voltage transformers, as in the following example, its vector
group can be adapted in the 7SC80 so that no external adaptors are required.
[7sc80-synchro-fkt-einspeis-24012013, 1, en_US]
Figure 2-111
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
and an additional voltage to be connected V
1
Infeed
Functions
2.20 Synchrocheck
.
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