17
Switching devices of bus section
panels (BS/BR) can be used to
earth either the busbars of BZ1 or
BZ2 by operation of:
- earthing switch located in BS
panel to earth BZ2 busbars
- earthing switch located in BS
panel to earth BZ1 busbars
BZ1
BZ2
BS
BR
BZ1
BZ2
BS
BR
BZ1
BZ2
BS
BR
a) Bus Zone Separation / Reconnection
b) Bus Zone (BZ) Earthing
Important!
Deviations from described
interlocking schemes may
occur. Therefore please refer
to switchboard specific low voltage
drawings also.
Further details of switchgear opera-
tion can be found in chapter 5.3/4/5.
^
^
BS = bus section panel
BR = bus riser panel
Switching devices BS
position/
position/
position/
operation
operation
operation
Circuit-breaker
ON
OFF
OFF
Spring charging
–
–
–
3position switch:
Disconnector
ON
ON
OFF
Interlocking lever
blocked
free
free
Earthing switch
OFF
OFF
OFF
Interlocking lever
blocked
blocked
free
Crank handle operation
Switching devices BR
position/
position/
position/
operation
operation
operation
3position switch:
Disconnector
ON
ON
OFF
Interlocking lever
blocked
free
free
Earthing switch
OFF
OFF
OFF
Interlocking lever
blocked
blocked
free
– not relevant for interlocking