High voltage polymer surge arresters

May 2002 Electrical Power & Protection

A new range of metal oxide surge arresters has been added to Tridelta's SBK Series for protecting high voltage systems up to 420 kV. Suitable for both indoor and outdoor applications, the surge arresters are designed to protect transformers and switchgear against switching overvoltages and hostile atmospheric conditions.

The gapless arresters are housed in glass fibre reinforced resin tubes (GFRR) with silicon rubber sheds. This construction gives the surge arresters a high bending strength with robust pressure relief characteristics and makes the devices ideally suited for use in highly contaminated environments.

Meeting IEC 99.4 standards, the new surge arresters provide high discharge capability in the voltage range 6-360 kV (15-62 Hz). Offering a nominal discharge current of 10 kA the surge arresters ensure low residual voltages at the equipment to be protected. The lightweight composite polymer design reduces the cost of installation and the risk of damage during transportation.

All fittings of the new arresters are manufactured from A1 alloy and stainless steel, while the various phase and earth connection options are available in stainless steel or hot dipped galvanised steel. A range of optional accessories is available including monitoring spark gaps, various surge counters and diagnostic apparatus. Tridelta is represented locally by Surge Technology.

Johan van Staden, Surge Technology

011 792 1303

[email protected]

www.surgetek.co.za

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