Initiate Auto-Reclosing From Cb Open Information - ABB REL650 Applications Manual

1MRK 506 334-UUS A
11.2.2.3
11.2.2.4
11.2.2.5
11.2.2.6
Application manual
• CBREADY, CB ready for a reclosing cycle, for example, charged operating gear.
• 52a to ensure that the CB was closed when the line fault occurred and start was
applied.
• No signal at input INHIBIT that is, no blocking or inhibit signal present. After the
start has been accepted, it is latched in and an internal signal "Started" is set. It can be
interrupted by certain events, like an "Inhibit" signal.

Initiate auto-reclosing from CB open information

If a user wants to initiate auto-reclosing from the "CB 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. It is then necessary to block
reclosing for all manual trip operations. Typically CBAuxContType=NormClosed is also
set and a CB auxiliary contact of type NC (normally closed, 52b) is connected to inputs
52a and RI. When the signal changes from "CB closed" to "CB open" an auto-reclosing
start pulse is generated and latched in the function, subject to the usual checks. Then the
reclosing sequence continues as usual. One needs to connect signals from manual tripping
and other functions, which shall prevent reclosing, to the input INHIBIT.
Blocking of the autorecloser
Auto-Reclose attempts are expected to take place only in the event of transient faults on
the own line. The Auto-Recloser must be blocked 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 Breaker failure function
• Busbar protection tripping
Depending of the starting principle (General Trip or only Instantaneous trip) adopted
above the delayed and back-up zones might not be required. Breaker failure local and
remote must however always be connected.
Control of the auto-reclosing open time
There are settings for the three-phase auto-reclosing open time, t1 3Ph to t5 3Ph.
Long trip signal
In normal circumstances the trip command resets quickly because of fault clearance. The
user can set a maximum trip pulse duration tTrip. A long trip signal interrupts the reclosing
sequence in the same way as a signal to input INHIBIT.
Section 11
Control
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