Manual MRIK3-C EN
Woodward
DOK-TD-MRIK3-C Rev. A
23
5.4.8 Supervision of the circuit breaker ready information
Because the supervising unit of the circuit breaker energy store operates often after the first fast
switch off, the signal "C.B. not AR-ready" is not evaluated anymore after an introduced reclosing.
The C.B. ready information is checked before an introduced AR for further ARs. There will be a re-
closing when the "circuit breaker ready" had been given before the begin of the reclosing cycle. If
not, the LED CB flashes and the display shows „S/E?“.
5.4.9 External
blocking
The AR-relay is blocked if the external AR-block input is activated. The LED 0
I is alight.
When the reclosing shot is set to „EXIT“, the MRIK3 can also be blocked at site. (see chapter
6.12.4)
5.4.10 Time sequence diagrams of MRIK3-C
Legend:
5.4.11 The unit is programmed for two shots, successful AR at the second
shot
Figure 5.1: Two shots, second AR successful
In case of a short circuit an energizing follows with subsequent tripping of the protection relay. The
circuit breaker is switched off and the short circuit is cleared. After expiration of the dead time t
D1
unit MRIK3-C gives the reclosing command to the circuit breaker. If the fault still exists the protec-
tion relay trips again and the above mentioned procedure is repeated as long until either the fault
was removed (here after the second reclosing) or the number of the set SHOTs is reached.
