Electricity + Control June 2018

round up

ELECTRICAL PROTECTION + SAFETY

Protection for systems with higher rated voltages

save up to 60 per cent in space. These surge protective devices are not only designed to meet high electrical demands, but also to withstand heavy mechanical loads. Besides being suitable for high voltages, DEHN arresters are resistant to vibration and shock. The DEHNguard DG SE CI is a single-pole, modular type two- surge arrester with a width of just 1.5 DIN modules. It consists of a base part and a protection module with integrated backup fuse. The module locking system used here makes sure that the protec- tive module stays fixed in place, unmoved by any knocks and vibra- tions incurred during transport and operation or by the enormous electrodynamic forces experienced during a discharge process. At the same time, it is easy to replace the protection module without the need for tools using the module release button. The arrester can be monitored via a floating remote signalling contact. The installation standard IEC 60364-5-53 limits the maximum line length for connecting an arrester to 0.5 metres. It is easy to comply with this standard using the DEHNguard SE CI arrester, because there is no need for an external backup fuse and the cor- responding wiring as it is already integrated in the arrester. In keeping with the increasing demands on the availability of electrical systems, the function of the arrester is also monitored via an indicator and remote signalling contact. The surge protective devices are simple to install in a small space, just 1.5 DIN modules, therefore saving time, space and installation costs. Enquiries:Tel +27 (0) 11 704 1487 or email info@dehn-africa.com associated with fuse replacement, giving users a total-cost-of-own- ership advantage. Critical, high demand power distribution systems, operating at 440/480 V or lower, need protection against extreme short-circuit fault currents. Such faults occur in systems with multi- ple paralleled power sources or large numbers of motor loads. The higher breaking capacity of the Compact NSX range can be used to provide better protection and higher continuity. Best-in-class protection • Compact NSX remains the highest-rated breaking capacity in its class of 100 kA for 500-690 V systems • Industry-leading breaking capacity of 200 kA at 440 V • Type II coordination for motor applications • Extended breaking capacity available across complete Com- pact NSX range from 100 to 630 A • Extended breaking capacity comes in the same space-saving frame sizes as other Compact NSX models Class-leading performance enables the entire Compact NSX range to meet the requirements of applications that once mandated cost- lier, bulkier protection devices. Users can realise significant cost savings by safely running higher power densities on LV platforms or benefitting from the higher energy efficiency and reduced space requirements of a 690 V system. Enquiries: Zanelle Dalglish.Tel. +27 (0) 11 254 6400 or email zanelle.dalglish@schneider-electric.com

Lightning and surge protection specialist DEHN+SÖHNE, repre- sented in South Africa by DEHN Africa, is proud to offer DEHN- guard SE CI WE 440 FM and DEHNguard SE CI 440 FM surge protective devices, especially for use in systems with higher rated voltages ― 400/690 V. The requisite backup fuse is also integrated. This makes effective protection against over-voltages possible for a range of applications, including wind power and photovoltaic plants, traction and aerial railway systems and even cranes in in- dustrial ports. Compared to conventional solutions with external backup fuses, the DEHN arresters with an integrated backup fuse

Demand more from low voltage systems

Schneider Electric has an innovative high breaking capacity for the Compact NSX range of moulded case circuit breakers (MCCBs), of- fering users more from their LV infrastructure and a cost-effective alternative to fuses over the long term. Companies involved in the exploration, extraction and processing of natural resources look for the smartest, safest, most cost-effective way to run their opera- tions. Opportunities to lower capital costs and operating expenses are often buried within a site’s low voltage (LV) power distribution networks.

Smart alternative to high-power fuses The high breaking capacity of the Compact NSX circuit breakers will withstand demanding fault conditions, staying reliably in service after three faults. After a fault is cleared, remote control reclosing functionality puts cir- cuits back into operation quickly, ena- bling maximum operational continuity. Discrimination and coordination will isolate faults, to avoid system-wide outages. Over the long term, this re- duces the cost impacts of downtime and avoids the labour and parts costs

24 Electricity + Control

JUNE 2018