[0,20 MB]
|
Cleaning of medium-voltage systems by suction
|
|
[0,15 MB]
|
Dry cleaning of LV installations by suction
|
|
[0,91 MB]
|
Labour protection laws obligate Maintenance tests for earthing and short-circuiting devices Entrepreneurs are responsible for the safety and health of their workers. In accordance with labour protection laws they have to ensure that all necessary protection measures are taken and ahered to when working at electrical installations. |
|
[1,47 MB]
|
Modular arc fault protection system DEHNarc Protection of persons against the effects of an arc fault, which cannot be completely excluded during live working, can be increased by using active protective equipment in addition to personal protective equipment. Such a protective equipment for use in low-voltage installations, the modular and portable DEHNarc protection system, which quickly extinguishes an arc by means of optical arc detection and a short-circuiter, will be presented. The detection with light sensors as well as the requirements and tests on tripping reliability and resistance to false tripping will be described. The short-circuiter with two short-circuiting cartridges and one disconnecting blade ensures the safe generation of a defined three-phase short-circuit in all types of systems. In this paper, the use and installation of the protection system in low-voltage switchgear installations, mainly with a high performance, will be explained. It could be demonstrated that, with this arc fault protection system, the thermal risks can be reduced far below the limits for second-degree burns, which is achieved by significantly reducing the arc fault duration. |