Synchronism And Voltage Check 25 (7Sj64 Only); Sync Function Group 1; General - Siemens siprotec SJ62 User Manual

2 Functions
2.19

Synchronism and Voltage Check 25 (7SJ64 only)

2.19.1 SYNC Function group 1

Applications
Prerequisites

2.19.1.1 General

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The synchronization function is only available for device 7SJ64. It has configuration
options for four different synchronization functions. The function and operation is de-
scribed in the following using the SYNC Function group 1. The same applies to
function groups 2 to 4.
When connecting two sections of a power system, the synchronism check verifies that
the start does not endanger the stability of the power system.
• Typical applications are, for example, the synchronism check of a feeder and a
busbar (see Figure 2-100) or the synchronism check of two busbars via bus coupler
(see Figure 2-101).
The synchronism check is only available for 7SJ64.
For comparing the two voltages the synchronism check uses the reference voltage V
and an additional voltage to be connected V
If a transformer is connected between the two voltage transformers (Figure 2-100), its
vector group can be adapted in the 7SJ64 relay so that external adaptors are not re-
quired.
Figure 2-100 Infeed
.
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SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
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