ABB REL650 series, Applications Manual

Page: 328 / 516

and Distance protection Aided trip. In some cases also Directional Ground fault function
Aided trip can be connected to start an Auto-Reclose attempt.
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, 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.
11.3.2.3 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 PICKUP. 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.
11.3.2.4 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.
Section 11
1MRK 506 334-UUS A
Control
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Application manual