Operation Of The Isolating Device For Voltage Transformers - ABB ZX0 Manual For Installation And Operation

4.5 Operation of the
isolating device for
voltage transformers
Isolate the relevant switchgear section before con-
necting or disconnecting voltage transformers.
− Comply with the safety regulations to EN 50110.
− Check the switchgear section for the off-circuit condition
as described in section 5.1.
− Earth the switchgear section and secure the working area
in accordance with section 4 and EN 50110 standard.
− Switch the mcbs of the relevant operating mechanisms
1)
off in order to prevent the switchgear section being ener-
gized by remote control.
The device for operation of the voltage transformer isolating device
may be located in the cable termination compartment or the low
voltage compartment, depending on the position and function of
the voltage transformers (figure 4.5.1).
If the isolating device is located in the cable termination compart-
ment, dismantle the cover on the cable termination compartment.
This is done by removing the two screws above the cover and
drawing the cover upwards.
Fig. 4.5.1: A) Location of the controls for the voltage transformer isolating device (example configurations)
mcb: miniature circuit-breaker
1)
62 | Manual ZX0 HB 600 en - Revision 05
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