Electrical Power & Protection


High capacity arrester makes use of gliding spark gap technology

October 2001 Electrical Power & Protection

The Dehnventil from Surge Technology is a two or four-pole arrester incorporating patented specialised gliding spark gap technology, which limits overvoltage values to below 3 kV during direct lightning strikes. The spark gap operates in parallel with heavy-duty arresters, which reduce surge voltages caused by direct lightning strikes to below 900 V.

Capable of protecting against direct lightning strikes of 100 kA per pole, the Dehnventil carries the SABS mark of approval and is guaranteed to operate effectively for 10 years. It was the first product to be manufactured locally to comply with the IEC 1024-1-1 standards for lightning current arresters used between Zone 0 (outside a building) and Zone 1 (immediately inside the building).

In the event of a direct lightning strike with multiple partial surges into a low voltage reticulation network, damage to the arrester could be caused by the first partial lightning current, allowing subsequent damaging currents to pass into the building without being limited to safe levels. With the two-step spark-gap/varistor protection, the Dehnventil is suitable for both 220 V and 380 V systems.

In instances where highly frequent discharges or long lasting low amplitude lightning currents are experienced, the characteristics of the varistors may change, allowing unwanted currents to flow at lower voltages. The Dehnventil has been designed to contain a special control disconnection mechanism which, under these conditions, will disconnect the defective varistor and still provide direct lightning surge current protection.

A signal neon lamp indicates the triggered state of the disconnected mechanism Remote indication is also possible and a test button allows the status of the arrester to be checked at any time.

Surge Technology

(011) 792 1303

[email protected]

www.surgetek.co.za





Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Power supply with scalability optimised
Schneider Electric South Africa Electrical Power & Protection
Schneider Electric has introduced the Easy UPS 3-Phase Modular to the South African marketplace. This robust uninterruptible power supply (UPS) is designed to protect critical loads while offering third-party verified Live Swap functionality.

Read more...
Prioritising arc flash safety
Comtest Electrical Power & Protection
Comtest has developed a range of thermal imaging and wireless testing tools from Fluke, designed to ensure safety is the top priority for engineers working in potentially dangerous arc flash zones.

Read more...
Hot Dip Galvanizers Association shines new light on renewable energy
Electrical Power & Protection
The Hot Dip Galvanizers Association of Southern Africa plays an important role in supporting the energy value chain – which spans clean, renewable and green energy – as it powers towards key sustainability targets.

Read more...
ACTOM supplies high-voltage equipment to wind farm project
ACTOM Electrical Machines Electrical Power & Protection
ACTOM High Voltage Equipment is currently in the process of manufacturing 400 kV and 132 kV high-voltage primary equipment for the Ummbila Emoyeni wind farm project in Mpumalanga.

Read more...
Energy measurement module for BL20 I/O System
Turck Banner Southern Africa Electrical Power & Protection
Turck’s BL20 energy measurement module enables precise monitoring of the energy consumption of single- or three-phase systems.

Read more...
Distributed energy resource management systems: a grid symphony
Schneider Electric South Africa Electrical Power & Protection
To listen to a symphony is one of the world’s great gifts. A conductor must ensure that instruments play beautifully as a whole and are kind to the ear and uplifting to the spirit yet shine in their individuality. The same can be said of a DERMS, which must effectively manage diverse energy sources to avoid compromising the grid’s integrity.

Read more...
Focus on energy sector infrastructure development can drive economic growth
Electrical Power & Protection
Post-election periods in South Africa often see a renewed focus on infrastructure development, with a specific emphasis on directing investments towards the energy sector. This strategic approach aims to accelerate economic growth, address energy challenges, and ultimately uplift the overall standard of living for the populace.

Read more...
Turning the continent into a global leader for green fuel
Electrical Power & Protection
Africa is at a turning point, with the potential to shift from being a supplier of raw materials to becoming a leader in advanced manufacturing, particularly in the growing green hydrogen market. For this transformation to happen, African countries must work together, combining their resources and talents to build a strong local economy.

Read more...
Epiroc showcases battery-electric drill rig at MINExpo 2024
Electrical Power & Protection
Epiroc recently showcased a demonstrator of the first ever Down-The-Hole SmartROC D65 battery-electric drill rig at the MINExpo exhibition in Las Vegas.

Read more...
Smart metering for utility management and sustainability
Electrical Power & Protection
Theodore Paraskevakos, a Greek-American inventor and businessman, developed the first smart meters in 1972 while collaborating with Boeing. Since then, smart meters have evolved significantly.

Read more...