Cable Connection - Siemens NXPLUS C Installation And Operating Instructions Manual

Description
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9.10

Cable connection

Possible combinations of cable connection types (T-plugs, coupling inserts) and
surge arresters up to 24 kV
Flashovers due to incompatible plug combinations
Can damage the switchgear.
➭ Use the same makes for combining plug types, surge arresters and limiters.
For gas-insulated switchgear NXPLUS C, only cable plugs shielded by means of an external
conductive layer (also called screened cable T-plugs) can be used. This external semi-
conductive layer must be earthed. Earthing is normally done through a cable connection.
Insulated cable T-plugs (without external conductive layer) are not permissible, as partial
discharges can arise very quickly due to the proximity to earthed parts. Partial discharges
destroy the cable T-plug, causing an arc between phase and earth.
The connection of conventional cable sealing ends with elbow adapters (e.g. type AKE) is not
permissible, as this connection system is insulated and not screened (no external conductive
layer).
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 802-9081.9
NOTICE