Combined current and overvoltage arrester

November 2004 Electrical Power & Protection Products & Solutions Smart Home Automation

The DEHNventil TT is a combined Class I lightning current arrester and Class II overvoltage arrester providing the same level of protection where previously up to 20 devices had to be installed and connected. The compact unit requires only 30% of the space of similar devices and no de-coupling inductance coils are necessary between the Class I and Class II arresters.

Easily installed in different types of power supply systems, DEHNventil TT makes calculations unnecessary. Its discharge capability meets protection level 1 in accordance with SABS, IEC, EN and VDE standards, the highest requirements of lightning protection at present. It is capable of protecting equipment, even in the case of a lightning strike with an intensity of 200 kA (10/350).

By using the encapsulated spark gap technology, safety distances to adjacent components within the distribution cabinet are unnecessary. Even at fault currents up to 25 kARMS a 35 A fuse will not trip when DEHNventil TT extinguishes the follow on current.

The combined current and overvoltage arrester has no leakage current. This allows direct use of the device upstream of the meter, and when testing the insulation, no disconnection is required. DEHNventil TT is compatible with other surge arresters in the DEHN RED/LINE family.

By using the twin terminals, connection is easy and inductive volt drop across long connection cables is avoided. An additional bus bar terminal at the output increases the combination possibilities with other DIN rail mounted components. LED indication is provided, or if required, the optional DEHNsignal DV remote monitoring module informs the user on the state of the protection, even when he is not on site.

All DEHNventil devices have an additional earth terminal. This allows a safe connection to the main earth bar as well as short connection to the protective earth conductor of the power supply system.

For more information contact Paul Van As, Surge Technology, 011 792 1303, [email protected], www.surgetek.co.za

Further reading:

Boiler selection for optimal thermal energy performance
Electrical Power & Protection
The changing world of boilers means companies wishing to improve their thermal energy efficiencies while containing costs and environmental impacts must make careful and informed decisions. AES’s rich pool of experience, ability to keep pace with new steam trends and technologies, and understanding of their clients’ production processes can assist clients to weigh up different options in a careful and informed manner.

Read more...

---

Securing Africa’s energy future starts at home
ACTOM Electrical Machines Electrical Power & Protection
Africa’s energy demands are surging, but the current reliance on imported solar technology leaves the continent vulnerable. This is why the prospect of building inverters and lithium batteries locally, designed for South Africa’s specific needs, is so promising.

Read more...

---

Dry-type transformers for Dutch intake substation
Electrical Power & Protection
A data centre in the Netherlands is the site of a recent innovation on the transformer landscape, where TMC Transformers has designed, manufactured and installed dry-type transformers in a large intake substation.

Read more...

---

Generators: The muscle in the new energy mix
WEG Africa Electrical Power & Protection
Contrary to their reputation as noisy and dirty, generators are a key part of modern energy supplies. Generators are reliable electricity workhorses in times of need. But they are also becoming welcome additions to modern energy mixes through efficiency improvements, noise reduction and flexible design choices.

Read more...

---

Doubling down on sustainability commitments: six practical solutions to meet the AI challenge
Schneider Electric South Africa Electrical Power & Protection
The best time to plant a tree, the old saying goes, was 20 years ago, and the second-best time is today. The same concept holds true to sustainability in the data centre industry.

Read more...

---

Condition-based maintenance can revolutionise business continuity
Schneider Electric South Africa Electrical Power & Protection
As businesses experience growing pressure to enhance operational efficiency and reduce downtime due to electrical failure, condition-based maintenance becomes essential for preventing unforeseen equipment breakdowns by assessing the real-time health of electrical systems.

Read more...

---

Ball valves and actuators to optimise HVAC performance
Schneider Electric South Africa Electrical Power & Protection
Schneider Electric South Africa offers the full range of innovative SpaceLogic and EasyLogic ball valves and actuators. These cutting-edge products are designed to optimise HVAC system performance, ensuring comfort and energy efficiency in industrial, commercial and residential buildings.

Read more...

---

Power over Internet splitter for reliable power distribution
Vepac Electronics Electrical Power & Protection
A manufacturing facility requires a stable power supply for its wireless access points mounted across the factory floor. However, these devices do not support direct PoE input. By deploying the IPS-342P PoE Splitter from Vepac, the facility can efficiently convert PoE power from the network switch into 24 V DC output.

Read more...

---

World’s fastest 16-bit arbitrary waveform generator
Vepac Electronics Electrical Power & Protection
The ARB Rider AWG-5000 is the world’s fastest 16 bit Arbitrary Waveform Generator, with 6,16 GS/s real time update rate (12,32 GS/s in RF mode) and 16 bit vertical resolution.

Read more...

---

Wireless test tools
Comtest Electrical Power & Protection
Fluke has on offer the Fluke 376 FC True-RMS Clamp Meter with iFlex, the most advanced troubleshooting tool for industrial and commercial electricians

Read more...

---