ABB Relion 620 Series

To Next Page

To Previous Page

1MAC308145-MB E Section 3

RER620 application

RER620 47

Application Manual

Figure 29: Synch-check function

RER620 “Latched Open” logic scheme:

The RER620 has a user settable “Latched Open” logic scheme as a part of default

configuration. This logic scheme will use one local HMI push button which will

immediately open all breaker poles (see Figure 9 and Figure 27) and set the

SECRSYN1(25;SYN

BLOCK

CL_COMMAND

BYPASS

SYNC_INPRO

SYNC_OK

CL_FAIL_AL

CMD_FAIL_AL

LLDB

LLLB

DLLB

DLDB

AND

NOT

IN OUT

SEQRFUF1_60_FUSEF_U

SECRSYN1_25_SYNC_OK

SPCGGIO2_25_BLK

SECRSYN1_25_SYNC_INPRO

Note:

In synch-check function the two voltage inputs

are referred to as Bus and Line while RER620

the inputs are referred to as Source-1 and

Source-2.

Unless otherwise indicated, consider

Source-1 as Bus and Source-2 as Line side.

For example if Source 2 voltage goes below

the ‘dead’ threshold setting, the same will be

considered as Line Dead as TRUE by synchro

check function. If Source 2 voltage goes

above ‘live’ threshold, the Live Line will be

TRUE.

ABB Relion 620 Series - Page 53