864-5091.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • Revision 06 173/214
Operation
40 Interlocks
Switching devices may only be controlled and operated in logical dependence on the switch
position of other devices. Unpermissible switching operations must be locked in order to
• provide full protection for the personnel
• prevent switchgear damages and power failures.
The interlocks are mainly of the mechanical type. For dependencies, see the following tables:
Fig. 201: Circuit-breaker panel
Switching operation Switching is operation only possible if Type
Q1 CLOSED / OPEN Q0 OPEN, Q2 OPEN, Q5 OPEN mechanical
Q2 CLOSED/OPEN Q0 OPEN, Q1 OPEN, Q5 OPEN mechanical
Q5 CLOSED/OPEN Q0 OPEN, Q1 and Q2 OPEN mechanical
Q0 CLOSED (mechanically) Q1, Q2, as well as Q5 not in intermediate position mechanically (for manual operation of Q1, Q2)
Q0 CLOSED (electrically) Q1, Q2, or Q5 not in intermediate position electrical
Q0 OPEN it is not interlocked by a locking device when the
feeder is earthed
mechanical
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or for earthing switches.
Fig. 202: Bus coupler (system 1 described, system 2 applies accordingly)
Switching operation Switching operation is only possible if Type
Q1 CLOSED/OPEN Q0 OPEN, Q15 OPEN mechanical
Q25 CLOSED/OPEN Q0 OPEN, Q2 OPEN mechanical
Q0 CLOSED (mechanically) Q1, Q2, Q15, as well as Q25 not in intermediate
position
mechanically (for manual operation of Q1, Q2,
Q15, or Q25)
Q0 CLOSED (electrically) Q1, Q2, as well as Q5 not in intermediate position electrical
Q0 OPEN (electrically) - being released by a bus coupler lock-in - it is not
interlocked by a locking device when the busbar
system is earthed
electrical / mechanical
Q0 OPEN (mechanically) it is not interlocked by a locking device when the
busbar system is earthed
mechanical
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or for earthing switches.
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