Lightning protection for IT networks and signalling equipment
November 2002
Electrical Power & Protection
DEHN's Blitzductor CT, with its two-piece design, allows easy testing and replacement on signal lines without interrupting the signal. It is able to withstand direct lightning surge currents up to 5 kA (10/350) and induced surge currents up to 20 kA (8/20). This makes it suitable for protecting cables that are exposed to direct lightning surge currents typically feeding from control rooms to field equipment.
The devices can be used on most systems such as 4 to 20 mA loops, ProfiBus, FieldBus, TTY, video coax, video twisted pair and on Siemens, Allen-Bradley and Honeywell systems. Due to the wide range of pluggable units available, there is a Blitzductor CT to suit most applications from 5 V to 250 V and frequencies up to 100 MHz.
If required, the combined lightning current/overvoltage surge arrester can be co-ordinated with other devices in DEHN's yellow line range. The compact, space saving Blitzductor CT minimises signal loss typically caused by the installation of similar devices.
Complying with the latest SABS IEC requirements for zoned lightning protection, a single unit can be used from zone 0 A to zone 2. The need for high series impedance has been reduced from typically 22 Ohm to less than 3 Ohm. The surge arrester automatically earths itself to a DIN rail, and even when it is removed, the signal is uninterrupted. An Ex version is also available for use in hazardous areas.
For more information contact Paul van As, Surge Technology, 011 792 1303, [email protected], www.surgetek.co.za
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