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14
Z X 1 . 5 - R
3.9.2 Manual earthing
Follow the same sequence as for electrical
operation, but using the manual push buttons
for the circuit breaker and the crank to operate
the three position switch.
When an additional mechanical interlock between
the circuit breaker and the earthing switch is fitted,
the following actions are necessary:
•
Open the control cabinet door
•
Switch off the circuit breaker (-Q0) by operating
the mechanical push button
•
Open flap (2.22) on the three position switch
operating mechanism (see Interlocks, section
3.8.2b)
Note
Flap (2.22) can only be opened when the circuit
breaker is OFF.
Do not use excessive force!
•
Switch off the disconnector (-Q1) with the
hand crank
•
Switch on the earthing switch (-Q5) manually
using the hand crank (6.1). (Note: Observe
"Emergency manual operation" in section 6.2.2).
about 24 turns clockwise. Close flap (2.22) again
Note
When flap (2.22) is open, the circuit breaker is
blocked in the OFF position.
•
Test for the off-circuit condition (capacitive
voltage indicator system, see section 6.4.1)
•
Switch the circuit breaker (-Q0) on using the
mechanical ON push button
•
Secure the panel to prevent switching operations
-
Switch off the mcbs for the circuit breaker
release circuit and for the operating
mechanism of the three position switch
-
Lock the control cabinet door or secure the
mechanical OFF button for the circuit
breaker if necessary
•
Label the panel to indicate that earthing has
been effected
Cancelling the earthing manually:
•
Open the control cabinet door and switch on the
mcb Release the OFF button for the circuit
breaker if necessary
•
Switch circuit breaker (-Q0) OFF with the
mechanical push button
•
Open flap (2.22)
•
Switch earthing switch (-Q5) OFF manually
•
Close flap (2.22)
3.10 Earthing the busbar
The procedure for earthing the busbar or a busbar
section is dependent on the configuration of
thesystem. Systems with sectionalizers/risers
permit earthing ofa busbar section without
additional equipment.
I N S T R U C T I O N M A N U E L
3.10.1 Electrical earthing of a busbar section
using the sectionalizer/riser
Operating sequence:
•
Circuit breaker in the sectionalizer panel OFF
•
All disconnectors in the busbar section to be
earthed OFF, apart from the disconnector (-Q11
or -Q12) between the busbar section to be
earthed and the sectionalizer breaker
•
Secure the panel to prevent switching operations
-
Switch off the mcbs for the circuit breaker
release circuit and for the operating mechanism
of the three position switch
-
Lock the control cabinet door or secure the
mechanical OFF button for the circuit breaker
if necessary
•
Label the panel to indicate that earthing has
been effected
The busbar section is then earthed. All the panels
in the section concerned are to be secured to
prevent switching operations, e.g. by tripping
the mcbs.
Cancelling the busbar earthing:
•
Open the control cabinet door in the sectionalizer
and switch on the mcb release the OFF button
for the circuit breaker if necessary
•
Circuit breaker (-Q0) OFF
•
Earthing switch (-Q51 or -Q52) OFF
3.10.2 Manual earthing of a busbar section
using the sectionalizer/riser
Perform the switching operations as described
in sections 3.9.2 and 3.10.1 accordingly.
3.10.3 Maintenance earthing of a busbar using
the test sockets in a tee-off
Condition:
•
The tee-off is earthed (see section 3.9)
•
All disconnectors in the busbar to be earthed
are OFF
Operating sequence:
•
Fit a short-circuiting bridge to the test
sockets for the earthed tee-off and connect
to main earthing bar (3.1)
•
Circuit breaker OFF
•
Earthing switch OFF
•
Disconnector ON
•
Circuit breaker ON
•
Secure the panel to prevent switching operations
-
Switch off the mcbs for the circuit breaker
release circuit and for the operating
mechanism of the three position switch
-
Lock the control cabinet door or secure the
OFF button for the circuit breaker if necessary
•
Label the busbar to indicate that earthing
has been effected
The busbar is then earthed. All the panels affected
are to be secured to prevent switching operations,
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