Synchronization Function; Sync Function Group 1; General - Siemens SIPROTEC 7SJ62 Manual

Multi-functional protective relay with local control

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Synchronization Function

The synchronization function of 7SJ64 provides configuration options for four individual synchronization func-

tions. 7SJ62 only provides one function group for the synchronization check. The function and mode of opera-

tional according to SYNC Function group 1 is described as follows. The same applies to function groups

When connecting two sections of a power system, the synchrocheck verifies that the switching does not en-

danger the stability of the power system.

Applications

• Typical applications are, for example, the synchronism check of a feeder and a busbar (see Figure 2-116)

or the synchronism check of two busbars via bus coupler (see Figure 2-117).

Prerequisites

In 7SJ62 only one SYNC function group exists. Furthermore, only the operation mode SYNCHROCHECK is avail-

able for 7SJ62.

For comparing the two voltages the synchronism check uses the reference voltage V

to be connected V

If a transformer is connected between the two voltage transformers (Figure 2-116), its vector group can be

adapted in the 7SJ62/64 relay so that external adaptors are not required.

Figure 2-116

SIPROTEC, 7SJ62/64, Manual

C53000-G1140-C207-2, Release date 01.2008

2.19 Synchronization Function

and an additional voltage