Manual ZX0 HB 600 en - Revision 05 | 27
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2.3.5 Handling of voltage
transformers
As a rule, the panel blocks are supplied with voltage transformers
installed. In individual cases, voltage transformers may also be
supplied loose. Install the voltage transformers in accordance with
the instructions in the section below.
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The weight of a voltage transformer can be over
30kg. Use suitable lifting gear (e.g. a mobile gan-
try crane) to install the voltage transformers for integrated
busbar measurement (type 3). We recommend having instal-
lation performed by two fitters. Observe the relevant accident
prevention regulations in the country of installation.
2.3.5.1 Installation of plug-in
voltage transformers
Isolate the relevant section of the system before
installing plug-in voltage transformers.
− Comply with the safety regulations to EN 50110.
− Check the switchgear section for the off-circuit condition in
accordance with section 5.1.
− Earth the switchgear section and secure the working area
in accordance with section 4 and EN 50110 standard.
− Switch the mcbs
1)
of the relevant operating mechanisms
off so that the system section cannot be energized by
remote control.
− Start installation with the middle transformer.
− Lay the transformer down, for example on the roof of the
low voltage compartment.
Fig. 2.3.5.1: Installed voltage transformer
1)
mcb: miniature circuit-breaker
− Wire the transformers as described in section 2.3.5.2.
− Remove the protective cap from the silicone part of the
voltage transformer and store it for later use.
− Check the silicone part on the voltage transformer for dam-
age. Observe the notes in section 2.1.3.
− Clean and grease the silicone part as described in section
2.1.3.
− Remove the plastic cover from the voltage transformer
socket on the panel and store it for later use.
− Clean the voltage transformer socket as described in sec-
tion 2.1.3.
− Slowly and carefully insert the transformer into the socket.
Always ensure that the transformer is guided in vertically
(do not tilt or tip it). The transformer cone must slide easily
into the corresponding socket. Check the position of the
silicone part in relation to the socket continuously and cor-
rect if necessary. A counter-pressure will become notice-
able approx. 20 mm before the limit position is reached.
− Screw the base plate of the transformer with the threaded
pins up to the mechanical stop with the aid of the screws
supplied (1) (with dished washers), tightening them evenly
across the diagonal (figure 2.3.5.1). Lock the relevant
threaded pin with a spanner during this process so that
there is no excessive strain on the welded-on studbolts.
− Where possible, wipe off any surplus grease which emerg-
es.
− Install the other voltage transformers in the manner de-
scribed.
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