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Operation
Mechanical interlocking
Interlocking conditions
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Interlocks
Switching devices may only be controlled and operated in logical dependence on the switch
position of other devices. Unpermissible switching operations must be blocked in order to:
• Provide full protection for the personnel.
• Prevent switchgear damages and power failures.
The interlocks are mainly of the mechanical type.
The circuit-breaker and the three-position disconnector are mechanically interlocked against
each other.
Mechanical interlocking prevents,
• during manual operation, the circuit-breaker from being closed if the three-position
disconnector is not in a defined end position (CLOSED/OPEN/EARTHED).
• during manual operation, the circuit-breaker from being closed if the operating lever is
inserted.
• the three-position disconnector from being operated while the circuit-breaker is closed.
Feeder and circuit-breaker panel of bus sectionalizer
Switching operation
Disconnector CLOSED/OPEN
Earthing switch CLOSED/OPEN
Circuit-breaker CLOSED
Circuit-breaker OPEN
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or
for earthing switches.
Bus riser of bus sectionalizer unit / Disconnectable busbar connection / Top-mounted busbar sectionalizer
Switching operation
Disconnector CLOSED/OPEN
Earthing switch CLOSED/OPEN
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or
for earthing switches.
Disconnectable busbar voltage transformer
Switching operation
Disconnector CLOSED/OPEN
Earthing switch CLOSED/OPEN
Additionally, electromechanical interlocks may be fitted for disconnectors and earthing switches or
for earthing switches.
Make-proof busbar earthing switch
Switching operation
Earthing switch CLOSED/OPEN Opening for operating lever open
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
Switching operation only possible if
circuit-breaker OPEN
earthing switch OPEN
circuit-breaker OPEN
disconnector OPEN
disconnector or earthing switch not in intermediate
position (shutter open)
not locked by a locking device
Switching operation is only possible if
associated circuit-breaker OPEN
Earthing switch OPEN
associated circuit-breaker OPEN
Disconnector OPEN
Switching operation is only possible if
Earthing switch OPEN
Disconnector OPEN
Switching operation is only possible if
Type
mechanical
mechanical
mechanical
mechanical
mechanical
mechanical
Design
electromechanical
mechanical
electromechanical
mechanical
Design
mechanical
mechanical
Design
mechanical
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