Autoreclosure 79 (Ar); Mode Of Operation; Features - ABB RELION REB500 Technical Manual

1MRK 505 406-UEN B
which are critical from the operating time point of view, so as not to adversely influence their
tripping times.
Application example
The scheme below shows a synchrocheck function in the same unit as the distance protection
and autoreclosure functions. The synchrocheck function is only required during the dead times
of the autoreclosure function. This is achieved by connecting the inverted output signal
AR ready generated by the autoreclosure function to the binary I/P ReleaseInp1 (or
ReleaseInp2) of the synchrocheck unit.
Distance
function
IEC19000452 V1 EN-US
Figure 48: Block diagram showing the interconnections between the functions for a
Input for bypassing the synchrocheck function (OverridSync)
A signal applied to this binary input causes a PermitToClose signal to be generated
immediately regardless of whether the conditions for synchronism are fulfilled or not.
This input overrides all other blocking or enabling inputs.
5.8

Autoreclosure 79 (AR)

5.8.1

Mode of operation

The function can be configured for single or three-phase auto-reclosure.
The unit can operate in conjunction with either of the two protection functions (distance and
overcurrent protection) and either an internal or external synchrocheck function.
5.8.2

Features

• Up to 4 fast or slow reclosure attempts
• First cycle with up to 4 individually configurable single and/or three-phase reclosure
attempts
• Independent operating indicators for each reclosure cycle
• Wide dead time setting range
• Provision to control bypassing of the synchrocheck unit and extending the dead time for
the first zone by external signals
• Clearly defined response to changing fault conditions during the dead time (evolving
faults)
Bay protection functions REB500
Technical manual
Start
AR ready
Auto-
Trip CB
ReleasInp1
reclosure
Trip CB 3P
Close CB
function
SynchroChck
Binary
circle
18000047-IEC19000452-1-en.vsdx
scheme with conditional enabling of the synchrocheck function
© Copyright 2019 ABB. All rights reserved
Synchro-
check
Section 5
Bay protection functions
GUID-C9F0769D-51E8-4D70-857D-019C7F3C578F v1
GUID-866541F5-4D5B-4E45-8A2C-468F6825B5E4 v1
GUID-CE6ACA20-0BA0-4B60-B22E-F9FD9AB495F9 v1
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