Functions
2.12 Circuit-Breaker Test
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
155
2.12
Circuit-Breaker Test
2.12.1
CB Close Detection
During energization of the protected object, several measures may be required or desirable. Following a
manual closure onto a short circuit, immediate trip of the circuit breaker is usually desired. This is done, e.g. in
the overcurrent protection by bypassing the time delay of a current element. For each protection function which
can be delayed, at least one element can be selected that will operate instantaneously in the event of closing,
as mentioned in the relevant sections. See also Section 2.1.6.1 at margin heading „Circuit-Breaker Status“.
The manual closing command must be indicated to the device via a binary input. In order to be independent of
the individual manual actuation, the command is set to a defined length in the device (adjustable with the
address
1150
SI Time Man.Cl
). This setting can only be changed using DIGSI at
Additional Settings
. The
following figure shows the logic diagram.
Figure 2-58
Logic diagram of the manual CLOSE procedure
Reclosing via the integrated local control or control using DIGSI can have the same effect as manual reclosure
(parameter
1152
Section 2.1.6.1 under margin heading „Circuit-Breaker Status“.
If the device has an integrated automatic reclosure, the integrated manual closure logic of the 7SD80 automat-
ically distinguishes between an external control command via the binary input and an automatic reclosure by
the internal automatic reclosure so that the binary input
„>Manual Close“
can be connected directly to the
control circuit of the close coil of the circuit breaker (Figure 2-59). Each reclosure that is not initiated by the
internal automatic reclosure function is interpreted as a manual reclosure, even it has been initiated by a control
command from the device.
With the user-definable logic functions (CFC) further control functions can be processed in the same way as a
manual close command.