Table 617: Important definitions related to auto-reclosing
auto-reclose shot an operation where after a preset time the breaker is closed from the breaker
tripping caused by protection
auto-reclose
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 earthing 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 auto-reclose operations. Since no auto-reclosing
follows, the circuit breaker remains open. This is called final trip or definite trip.
9.4.6.1 Shot initiation
A070869 V1 EN
Figure 386: Example of an auto-reclose program with a reclose scheme matrix
In the AR function, each shot can be programmed to locate anywhere in the reclose
scheme matrix. The shots are like building blocks used to design the reclose
program. The building blocks are called CBBs. All blocks are alike and have
settings which give the attempt number (columns in the matrix), the initiation or
blocking signals (rows in the matrix) and the reclose time of the shot.
Section 9 1YHT530004D05 D
Control functions
710 615 series
Technical Manual
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