Reliable Power for the Industry
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Reliable Power for the Industry Arc Fault Protection System DEHNshort

Photo: HAGER The photo shows an arc fault test with I = 65 kA, UP = 420 V, tb = 300 ms, pc arc ' P ' b

Every year, arc faults cause severe personal injury, heavy damage to installations and thus high production downtime costs. Even in the most modern switchgear assemblies, the risk of an arc fault cannot be completely ruled out. These arc faults can be caused by incorrect work on switchgear assemblies, contaminants, foreign objects or ingress of animals in the switchgear assembly. Within a few milliseconds, high amounts of energy are released, generating heat, a pressure wave and toxic gases similar to an explosion. Persons in the vicinity of switchgear assemblies are severely injured or...

DEHNshort protects persons and installations… ... in wind turbines Arc faults in wind turbines frequently cause fire. This fire occurs so high up that it is impossible for the fire brigade to extinguish it. In this case, the wind turbine is burnt out in a controlled way and must be completely replaced. This damage can cost millions, not taking into account the costs for the loss of power generation. Such a total loss can be reliably prevented by using the arc fault protection system DEHNshort. …in the chemical and petrochemical industry Maximum availability is required wherever motor...

…in data and computer centres Availability is a top priority in modern computer centres to ensure customer satisfaction. Fire is one of the most prevalent threats to computer centres and is most frequently caused by electrical faults. The arc fault protection system DEHNshort considerably reduced the risk of fire. Large railway stations are neuralgic traffic nodes. If power supply is not continuously ensured, the sensitive railway network collapses. This results in reduced transportation capacities and thus considerable delays for passengers. The arc fault protection system DEHNshort...

Arc fault protection system DEHNshort DEHNshort is a modular arc fault protection system which detects arc faults with the help of current and light sensors. Thanks to its short response time of a few milliseconds, the incident energy is reduced to a minimum. DEHNshort takes the protection of persons and systems to another level and by far exceeds the requirements of the currently applicable IEC TR 61641* standard. Detection: The current transformers at the infeed detect the overcurrent resulting from the arc fault and transmit this information to the relevant detection device. Sensors...

Fibre optic sensors are installed to detect the arc fault along all live parts of a switchgear assembly where ignition of an arc fault is to be expected. Optoelectronic sensors monitor a large detection area and are positioned in every compartment of a switchgear assembly. Product features: • Arc fault quenching within a few milliseconds via power thyristors • Detection devices at the front of the switchgear assembly • Modular system • Activation of the short-circuiter via fibre optic cables • Compact system components IEC TR 61641* • Regulates the prerequisites for testing the arc fault...

• Connection of two short-circuiters • Connection of four sensor channels (including up to three optoelectronic sensors each) • LEDs for status indication • Four tripping relays • Bidirectional exchange of sensor signals • Connection of three current transformers • One self-monitoring relay DSRT DD PS light detection device (detection via point sensors) • Connection of two short-circuiters • Connection of four sensor channels (including up to three optoelectronic sensors each) • LEDs for status indication • Four tripping relays • Bidirectional exchange of sensor signals • One...

• Continuous self-monitoring • Easy installation • Monitoring of one compartment • Max. three sensors per channel in series DSRT FS fibre optic sensor • Continuous self-monitoring • One sensor per panel and busbar • Insensitive to extraneous light • Numerous prewired sensor lengths DSRT QD short-circuiter unit Type Part No. DSRT LWL fibre optic cable Type DSRT LWL U fibre optic converter • Can be used as interface converter between external detection devices and DSRT QD short-circuiter units • Activation at 24 V d.c. • Activation by two short-circuiters via DSRT LWL fibre optic cables

Functional principle of the arc fault protection system DEHNshort Supply from the transformer Detection device DEHNventil uninterrupted power supply Current detection Circuit breaker optoelectr. sensor Fibre optic cable The overcurrent and light emission resulting from an arc fault are detected with the help of current transformers and sensors. The current transformers are situated upstream of the incoming circuit breaker and have to be protection transformers to reliably exclude saturation effects. To detect the light, either optoelectronic or fibre optic sensors are used. The sensor...

The personal protective equipment DEHNcare® combines maximum protection and unique wearing comfort and is tested to international standards. It consists of a safety helmet for electricians, protective gloves and a jacket or coat. DEHNcare® protective gloves, trousers, jackets and coats are arc-fault-tested to class 2 (IEC 61482-1-2*) and certified according to the EEC directive. The combination of leather and neoprene material and the high-quality workmanship ensure excellent fit. The safety helmet for electricians with arc-fault-resistant face shield protects the face and head region from...

Surge Protection Lightning Protection Safety Equipment DEHN protects. DEHN + SÖHNE GmbH + Co.KG. Hans-Dehn-Str. 1 Postfach 1640 92306 Neumarkt Germany Tel. +49 9181 906-0 Fax +49 9181 906-1100 info@dehn.de www.dehn-international.com DEHNshort Arc Fault Protection System actiVsense, BLITZDUCTOR, BLITZPLANER, DEHN, DEHN Logo, DEHNbloc, DEHNcare, DEHNfix, DEHNgrip, DEHNguard, DEHNport, DEHNquick, DEHNrapid, DEHNshield, DEHNsnap, DEHNventil, HVI, LifeCheck, Red/Line are protected by German Trademark, by Community Trademark (EU) and/or are registered trademarks in other countries. We accept no...