Siemens NXPLUS C Installation And Operating Instructions Manual page 129

802-9081.9 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • Revision 11
Installing the voltage transformers
Hazardous voltage
Can cause death, injury or considerable property damage.
The metal coating on the outside of voltage transformers is connected to earth potential. If the
metal coating is damaged, the voltage transformer is not safe-to-touch anymore.
➭ Do not damage the metal coating of voltage transformers.
Flashovers in the adapter due air inclusions
Insufficient busbar insulation can damage the switchgear.
➭ While installing the voltage transformer, let excess air out of the adapter with a cable strap.
➭ Verify intact condition of the cable strap. If the cable strap was damaged when it was
pulled out, remove the voltage transformer and eliminate the residues of the cable strap.
To be able to close the busbar in a surge-proof way again, e.g. to remove a defective voltage
transformer, keep the following objects in the storage box after installation:
• Remaining screw-type cones and caps
• Residual mounting paste (tube)
• Cable strap
Recommended installation order for voltage transformers:
➭ In order to better reach the bolted joints, install the voltage transformers on phases L1 and
L3 first, and then the voltage transformer on phase L2.
During installation, protect the voltage transformer bushings from damage.
➭ Plug the removed protective caps of the vessel bushings onto the voltage transformer
bushings.
Fig. 92: Protective cap
➭ Apply mounting paste to the high-quality joints of the voltage transformer and the end
adapter / cross adapter before mounting.
➭ While mounting the voltage transformer, let excess air out of the end adapter / cross adapter
with a cable strap ⑮ .
DANGER
NOTICE
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Installation
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