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GMA
6
Operation (contd.)
6.2.4 Electromagnetic interlocks
Electromagnetic blocking coils can be used for inter-panel as well as
intrapanel interlocks:
■■ The insertion openings for disconnector and earthing switch by the
interrogation slide are prevented from being released.
■■ The circuit-breaker’s ON and OFF pushbuttons are blocked.
Important:
□□ If no blocking coils are being used for the locking devices, a
mechanical lock-out with cylinder or U lock must be provided.
□□ In case of failure of the supply voltage, all electrical interlocks
are in their “locked” position. Measure: Re-establish supply
voltage.
Blocking coil required, if
Interlock function
...
... motor drive on disconnector
ON pushbutton of circuit-breaker
Bus section coupler:
■■ ON / OFF pushbutton of circuitbreaker
■■ Interrogation slide for earthing switch
in circuit-breaker panel
■■ Interrogation slide for disconnector
and earthing switch in bus riser panel
all disconnectors in the outgoing feeder
panels or additional couplers
... bus section coupler in
switchgear
right busbar section
left busbar section
ON
OFF
blocking coil
Fig. 18
Blocking coil interlocks in GMA switchgear with bus section coupler
1
2
Fig. 19
Blocking coils in a circuit-breaker panel
1 Blocking coil on ON pushbutton of circuit-breaker
2 Blocking coil on interrogation slide
AGS 531 521-01
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