ABB 615 Series ANSI, Technical Manual

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Section 7
1MAC050144-MB C
Control functions
502 615 series ANSI
Technical Manual
The autoreclose function can be used with every circuit breaker that has the ability for a
reclosing sequence. In 79 autoreclose function the implementing method of autoreclose
sequences is patented by ABB
Table 420: Important definitions related to autoreclosing
7.2.6.1 Shot initiation
In some applications, the
PICKUP
signal is used for initiating or blocking autoreclose
shots, in other applications the
TRIP
command is needed. In its simplest, the autoreclose
function is initiated after the protection has detected a fault, issued a trip and opened the
breaker. One input is enough for initiating the function.
The function consists of six individual initiation lines
INIT_1, INIT_2 .. INIT 6
and delayed initiation lines
DEL_INIT_x
. The user can use as many of the initiation lines
as required. Using only one line makes setting easier, whereas by using multiple lines,
higher functionality can be achieved. Basically, there are no differences between the
initiation lines, except that the lines 2, 3 and 4 have the delayed initiation
DEL_INIT
inputs, and lines 1, 5 and 6 do not.
autoreclose shot an operation where after a preset time the breaker is closed from the breaker tripping
caused by protection
autoreclose
sequence
a predefined method to do reclose attempts (shots) to restore the power system
SOTF If the protection detects a fault immediately after an open circuit breaker has been
closed, it indicates that the fault was already there. It can be, for example, a forgotten
grounding after maintenance work. Such closing of the circuit breaker is known as
switch on to fault. Autoreclosing in such conditions is prohibited.
final trip Occurs in case of a permanent fault, when the circuit breaker is opened for the last
time after all programmed autoreclose operations. Since no autoreclosing follows, the
circuit breaker remains open. This is called final trip or definite trip.