Description
52/293 Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 802-9081.9
Cable T-plug connection • Connection of cable T-plugs suitable for bushings with outside cone as interface type C
according to EN 50181
• Connection cross-sections up to 800 mm
2
Surge arresters • Pluggable on cable T-plug
• Surge arresters recommended if, at the same time,
- the cable system is directly connected to the overhead line,
- the protection zone of the surge arrester at the end tower of the overhead line does not
cover the switchgear
Surge limiters • Pluggable on cable T-plug (Nexans Euromold, nkt cables, Tyco Electronics Raychem)
• Nexans Euromold
- Use of the cable T-plug 300PB-630A-U-BEGRENZ for connection of the surge limiter
• nkt cables
- Use of the cable T-plug CC 12-630, CC 17,5-630 or CC 24-630 in combination with the
assembly kit 26 500 33 for connection of the surge limiter
• Tyco Electronics Raychem
- Use of the cable T-plug SMOE 63862 for connection of the surge limiter
• Surge limiters recommended when motors with small starting currents (<600 A) are
connected
9.11 Ready-for-service indicator
Fig. 26: Ready-for-service indicator on the front cover
Features • Self-monitoring, easy to read
• Independent of temperature and external pressure variations
• Independent of the site altitude
• Only responds to changes in gas density
• Option: Signaling switch 1°changeover contact for remote electrical indication
Mode of operation
For the ready-for-service indicator, a gas-tight measurement box is installed inside the
switchgear vessel.
INFORMATION
For 3-, 4-, 6- or 8-fold cable connection:
➭ Observe the manufacturer’s specifications to the rated normal current of the cable plugs
used.
Fig. 27: Principle of gas monitoring with ready-for-
service indicator
①
Switchgear vessel (filled with SF
6
gas
②
Measurement box
③
Magnetic coupling
④
Red indication: not ready for service
⑤
Green indication: ready for service
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