Withdrawable Metering Parts; Earthing Switch - Type Ek6 And St-Vg-01 - ABB UniGear ZS1 Instruction Manual

6.2.6 Withdrawable metering parts

Handling of the withdrawable metering part in the metering panel is as described in section 6.2.1,
without, however, the switching operations and interlocking functions.
Withdrawable metering parts in incoming and outgoing feeder panels are put into the cable
compartment using a ramp. They reach their service position immediately and engage in the panel
earthing by means of the two locking pins at the sides. The voltage transformers used correspond
to the type used in the metering panel, and therefore HRC fuses can also be used along with the
voltage transformers.

6.2.7 Earthing switch - type EK6 and ST-VG-01

The earthing switch - has a snap closing mechanism which is independent of the rotation of the drive
shaft. An earthing switch 6 (figure 2) allocated to a circuit-breaker is only enabled for switching when
withdrawable part 13 is in the test/disconnected position or removed from the switchgear panel. Only
turn earthing switches on when the doors are closed.
Manual opening and closing:
• Press slide 14.2 (picture 127) onto the operating lever recess socket downwards. (When the switch
is closed, it is already in this position!)
Caution
If the operation is prevented, do not force the interlock and check that the operation sequence is
correct.
• Fit operating lever 122 onto hexagonal shaft 14.1,(figures 127, 128) which is now released for
operation.
Note
Put operating lever 122 in pointed upwards or downwards on the hexagonal shaft so that there is
sufficient room for movement of the operating lever even if space is limited at the sides.
• Turn the lever clockwise through approx. 180° until the stop is reached to close the earthing switch,
or anticlockwise until the stop is reached to open the earthing switch;
• Observe the mechanical/electrical switch position indicator;
• Remove operating lever 122. Slide 14.2 remains open if the earthing switch is in the closed
position.
Make sure that the operating lever is turned right up to the stop in the opening process, to ensure
that the earthing switch is in its defined limit position. The manual operating mechanism can also
be fitted with a locking magnet.
Opening and closing with motor operator (EK6 only)
The earthing switch can also be fitted with a motor operator.
• Briefly operate the electrical control for opening or closing. The earthing switch is then switched
automatically into the opposite position.
Emergency manual operation
If a fault should occur in the motor operator, the earthing switch can be switched to emergency
manual operation with lever 122, in a similar way to manually operated earthing switches.
Caution
During emergency manual operation of a motor-operated earthing switch, the interlock is not
functional!
On emergency manual operation, coupling with the motor operator is automatically released. To
disengage the coupling to the motor operator, first turn the lever 122 further in the pre-selected
direction up to the relative stop (small angle of turning). On the next operation with the motor operator
after its function has been restored, the coupling automatically engages again.
Note
The lever may only be fitted temporarily to carry out an emergency manual switching operation.
The power to the motor operator must be switched off for the duration of any breakdown.
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