Artículos técnicos

Artículos técnicos

Electrical safety for mobile generators 

Mobile generators are indispensable aids when power needs to be supplied to equipment that has no direct access to a permanent installation. This applies e.g. to building and assembly sites, rescue missions, and also to events. Mobile generators can also supply sections of permanent installations in which the failure of the public power supply can result in critical situations, e.g. in buildings used for breeding animals, fire stations, etc. In this context, special attention must be paid to protection against electric shock, since the users are typically not very knowledgeable about electricity.

Dipl.-Ing. Harald Sellner Dipl.-Ing. Holger Potdevin


Artículos técnicos

Avoiding failure of drive systems

The offline monitoring function of the insulation monitoring device ISOMETER® isoNAV685-D-B makes it possible to monitor the state of the insulation in drive systems, even in earthed systems

Dipl.-Ing. Dieter Hackl
Dipl.-Ing. Harald Sellner


Artículos técnicos

Electrical safety in control and auxiliary circuits

The increasing health and safety requirements on machines and installations require comprehensive measures to protect man and machine against possible hazards. For instance, insulation faults in a controller must not result in hazardous movements of a machine. If there is a high availability requirement, it is also appropriate to consider this aspect correspondingly on the selection of the type of system and the protective measures. Both the related normative and practical requirements are explained in the following article.

Dipl.-Ing. Harald Sellner
Dipl.-Ing. Holger Potdevin


Artículos técnicos

Operating photovoltaic installations safely and efficiently

Electrical safety and safety standards for PV installations represent a particular challenge for the operator Like every complex technical installation, a PV installation can also produce hazards. In addition, due to its nature a PV installation places high requirements on the system safety technology with its large voltage fluctuations. The often physically extensive PV installations are also subject to a heterogeneous range of climatic conditions such as UV radiation, heat, frost, moisture, salt and other environmental eff ects, e.g. rodent damage. As a consequence far-reaching safety standards apply to PV installations. This article addresses the requirements from the standards and how they can be implemented.

Dipl.-Ing. Dieter Hackl

Artículos técnicos

Verificación inicial y revisión de sistemas IT (suministros de electricidad aislados de tierra)

El objetivo de las verificaciones realizadas en instalaciones y equipos eléctricos es establecer que no existen defectos y que después de la puesta en marcha, así como durante el uso, está garantizada una protección personal y material adecuada. Las pruebas en sí y el entorno correspondiente están descritos en los más variados reglamentos y normas aplicables. El siguiente artículo describe los requisitos que son aplicables o que deben observarse para suministros eléctricos aislados de tierra (sistemas IT).

Dipl.-Ing. Harald Sellner, Director Normalización
Dipl.-Ing. Wolfgang Hofheinz


[Translate to spanish:] [Translate to canadian english:] Insulation resistance – testing – measuring – monitoring

Insulation resistance – testing – measuring – monitoring

The insulation resistance is particularly important for the prevention of damage and injury, and for the reliability of electrical systems and equipment. On the one hand it is basis for the protection of individuals and systems, on the other hand it also serves as an important indicator for the condition of an electrical installation. Depending on the life cycle of a system or an item of equipment, the insulation resistance is to be tested, to be measured or also to be monitored.


Artículos técnicos

Electrical safety for DC systems

Low voltage DC systems (LV DC systems) play an important role in an ever increasing number of applications. The increasing importance of renewable energies is one of the reasons. Photovoltaic installations generate DC that can be stored in decentral battery installations. In addition there are a large number of loads that can be operated in an energy efficient manner with DC, such as electric vehicles and railway rolling stock or lighting installations. The DIN VDE 0100 series of standards is also definitive here for the electrical safety in the DC installation, however the specific requirements for DC systems must be observed.

Dipl.-Ing. Harald Sellner, 01-2013


Artículos técnicos

A safe trip all the time – with reliable power supply

The failure of navigation and drives fail may raise considerable problems concerning the operation of the ship. But this is not the only reason why safe electric power supply on modern ships plays a major role. Power supply systems of different safety relevance and different voltages require a differentiated distribution and supply concept including the respective monitoring devices in order to prevent unexpected operational interruptions and possible hazards in a comprehensive way.

Dipl.-Ing. Harald Sellner, Leiter Technisches Marketing, 01-2013


Artículos técnicos

¿Por qué el sistema IT es a menudo la mejor opción para cualquier tipo de instalación eléctrica?

El sistema IT (“sistema no aterrizado”) es un tipo de sistema utilizado con poca frecuencia en comparación con el TN o TT (“sistema aterrizado”) – pero a menudo podría ser la mejor alternativa.

Dr. Dirk Pieler


Artículos técnicos

The new dimension in insulation monitoring

The general view of the electrical supply is mostly simply that "electricity comes out of the wall socket". This easy to understand, but very superficial statement, also reflects a lack of concern among the population about electrical safety. The specialist world has been treading new ground in the areas of power generation, power distribution, safety and the related applications for decades. For this reason, the related standards are continuously revised, new standards written and scientific findings implemented, for example on protection against electric shock.
Dipl.-Ing. Harald Sellner


Artículos técnicos

Charging Electric Vehicles - Protection against Electric Shock by DC Fault Current Sensor Units

In electromobility subjects a mutual exchange of information and the necessary knowledge transfer between power suppliers and vehicle developers are essential and the results are implemented into the standards. Protection against electric shock, for example, is particularly important in charging electric vehicles. 

Dipl.-Ing. Wolfgang Hofheinz, Dipl.-Ing. Harald Sellner, Dipl.-Ing. Winfried Möll


published in: ATZelectronik, 05122012, Volume 7, Springer Automotive Media | Springer Fachmedien Wiesbaden GmbH


Artículos técnicos

Insulation Monitoring in High Voltage Systems for Hybrid and Electric Vehicles

As a consequence of recent developments in electric drives in vehicle manufacture there are new aspects to be addressed in the protection of individuals and systems. The battery voltages used at DC 120 V to DC 1000 V are way beyond protective extra low voltage...

Dipl.-Ing. Holger Potdevin

published in: ATZelektronik 06/2009 Volume 4, Springer Automotive Media | Springer Fachmedien Wiesbaden GmbH