Initiate Auto Reclosing From Circuit Breaker Open Information - ABB RELION 670 SERIES Applications Manual

Section 15
Control
15.2.2.3
15.2.2.4
658
distance protection aided trip. In some cases also directional ground fault protection aided
trip can be connected to start an auto reclose attempt. If general trip is used to start the auto
recloser it is important to block it from other functions that should not start an auto
reclosing sequence.
In cases where one wants to differentiate three-phase auto reclosing dead time, for
different power system configuration or at tripping by different protection stages, one can
also use the RI_HS input (initiate high-speed reclosing). When initiating RI_HS, the auto
reclosing dead time for three-phase shot 1, t1 3PhHS is used and the closing is done
without checking the synchrocheck condition.
A number of conditions need to be fulfilled for the start to be accepted and a new auto
reclosing cycle to be started. They are linked to dedicated inputs. The inputs are:
• CBREADY, circuit breaker ready for a reclosing cycle, for example, charged
operating gear.
• CBCLOSED to ensure that the circuit breaker was closed when the line fault occurred
and start was applied.
• No signal at INHIBIT input that is, no blocking or inhibit signal present. After the start
has been accepted, it is latched in and an internal signal "start" is set. It can be
interrupted by certain events, like an "inhibit" signal.

Initiate auto reclosing from circuit breaker open information

If a user wants to initiate auto reclosing from the circuit breaker open position instead of
from protection trip signals, the function offers such a possibility. This starting mode is
selected with the setting parameter StartByCBOpen=Enabled. Typically a circuit breaker
auxiliary contact of type NO (normally open) is connected to CBCLOSED and RI. When
the signal changes from circuit breaker closed to circuit breaker open an auto reclosing
start pulse is generated and latched in the function, subject to the usual checks. The auto
reclosing sequence continues then as usual. Signals from manual tripping and other
functions, which shall prevent auto reclosing, need to be connected to the INHIBIT input.
Blocking of the auto recloser
Auto reclose attempts are expected to take place only for faults on the own line. The auto
recloser must be blocked by activating the INHIBIT input for the following conditions:
• Tripping from delayed distance protection zones
• Tripping from back-up protection functions
• Tripping from breaker failure function
• Intertrip received from remote end circuit breaker failure function
• Busbar protection tripping
1MRK 506 369-UUS -
Line distance protection REL670 2.2 ANSI
Application manual