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
Further reading:
South African businesses can alleviate energy price crisis
Electrical Power & Protection
While grid instability remains a concern, the immediate and most critical driver of South African commercial and industrial investment in renewable energy is the escalating cost of electricity.
Read more...
Real-time modelling is the key to a resilient, bi-directional energy grid
Schneider Electric South Africa
Electrical Power & Protection
Utilities and municipalities are facing a challenge as the country’s legacy power grid, engineered for one-way energy delivery from centralised suppliers to end-users, must rapidly evolve to meet a new paradigm.
Read more...
Shielding data centre growth from the looming power crunch
Schneider Electric South Africa
Electrical Power & Protection
Today’s digital economy is placing unprecedented strain on the power grid. The good news is that these challenges are not insurmountable. By adopting proactive strategies such as alternative power sources, infrastructure planning and software, operators can secure capacity, build resilient facilities and scale sustainably.
Read more...
Circuit breaker innovations
Schneider Electric South Africa
Electrical Power & Protection
Recent advancements in circuit breaker technology have seen a major step forward in setting new standards for efficiency and sustainability in data centres, industrial and commercial infrastructure.
Read more...
Common battery tester errors and what they mean
Comtest
Electrical Power & Protection
Battery testers help quickly assess battery health, diagnose issues, and determine whether a battery needs a charge or replacement. This guide covers some of the most common battery tester errors, what they mean, and what can cause them.
Read more...
Cathodic protection design considerations that influence ESG outcomes
Omniflex Remote Monitoring Specialists
Electrical Power & Protection
Major infrastructure like wharves, bridges, pipelines and tanks are at constant risk of corrosion. David Celine, managing director of cathodic protection specialist Omniflex, explains how CP system design can support ESG commitments, while simultaneously lowering costs and improving maintenance capabilities.
Read more...
Africa’s digital future – building critical power infrastructure for data centre leadership
Electrical Power & Protection
Africa’s digital economy is growing rapidly, and countries like South Africa, Nigeria and Kenya are leading the way. However, a major challenge remains. Sustainable and reliable power systems must form the backbone of Africa’s digital growth to ensure lasting success.
Read more...
Recovering condensate and waste heat
Electrical Power & Protection
According to Associated Energy Services, strong partnerships with thermal energy users optimise opportunities to benefit from condensate return. waste heat recovery and the prevention of system contamination.
Read more...
Quantum engine powered by particle entanglement
Electrical Power & Protection
In a landmark achievement that signals a new era in energy research, a team of physicists in China has carried out the first successful test of a quantum engine powered by particle entanglement. This technological breakthrough represents a fundamental shift in our approach to energy production.
Read more...
Advancing sustainability in South Africa’s fruit industry
Schneider Electric South Africa
Electrical Power & Protection
Schneider Electric, together with Technoserve Medium Voltage, has implemented its advanced SF6-free MV switchgear at Two-a-Day situated in Grabouw in the Overberg district.
Read more...
printer friendly version