Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Insulation monitors secure power supply

05.03.2008
For early detection and correction of insulation faults, the Siemens Building Technologies Division now offers two new rack-mounting units: the 7LQ3 354 and 7LQ3 355 insulation monitors. They monitor non-grounded power supplies in medical premises, detect insulation faults as soon as they occur, and output warning signals.

Mains-dependent medical equipment must remain in operation even when threatened with a short-circuit to frame, or when the general power supply fails. The 7LQ3 354 and 7LQ3 355 insulation monitors guarantee this by monitoring the insulation resistance of the non-grounded power supply as well as the load current and the temperature of a transformer. On the 7LQ3 354, the alarm value of the insulation resistance is 50 kilo-ohms (fixed).

The 7LQ3 355 monitor also offers an adjustable response threshold of 50 to 500 kilo-ohms. In addition, a line of color LEDs indicates the current insulation status between 20 kilo-ohms and 1 mega-ohm. Users can thus see the plant status at a glance. Changeover contacts can be used to connect the devices to the building automation system or to the relevant medical monitoring system. The insulation monitors can even be installed in existing systems. The 7LQ3 355 monitor is compatible with the 7XV93 test and signaling combinations from Siemens.

If the voltage drops below 90 percent of the rated value, the 5TT3411 and 5TT3412 voltage relays transmit the signal for switching to a second mains supply to secure the continued operation of the medical equipment. This means they are suitable for the secure power supply not only of medical premises but also of other sensitive areas such as server systems, etc. The new voltage relays are suitable for single-phase (5TT3411) and three-phase (5TT3412) supply systems.

Volker M. Banholzer | Siemens A&D
Further information:
http://www.siemens.com/beta

More articles from Machine Engineering:

nachricht Aachen becomes a center of excellence for optics production
01.10.2019 | Fraunhofer-Institut für Produktionstechnologie IPT

nachricht Recyclable lightweight single Component Composite Material developed for Injection-Molded Components
27.08.2019 | Fraunhofer-Institut für Werkstoffmechanik IWM

All articles from Machine Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: An ultrafast glimpse of the photochemistry of the atmosphere

Researchers at Ludwig-Maximilians-Universitaet (LMU) in Munich have explored the initial consequences of the interaction of light with molecules on the surface of nanoscopic aerosols.

The nanocosmos is constantly in motion. All natural processes are ultimately determined by the interplay between radiation and matter. Light strikes particles...

Im Focus: Shaping nanoparticles for improved quantum information technology

Particles that are mere nanometers in size are at the forefront of scientific research today. They come in many different shapes: rods, spheres, cubes, vesicles, S-shaped worms and even donut-like rings. What makes them worthy of scientific study is that, being so tiny, they exhibit quantum mechanical properties not possible with larger objects.

Researchers at the Center for Nanoscale Materials (CNM), a U.S. Department of Energy (DOE) Office of Science User Facility located at DOE's Argonne National...

Im Focus: Novel Material for Shipbuilding

A new research project at the TH Mittelhessen focusses on the development of a novel light weight design concept for leisure boats and yachts. Professor Stephan Marzi from the THM Institute of Mechanics and Materials collaborates with Krake Catamarane, which is a shipyard located in Apolda, Thuringia.

The project is set up in an international cooperation with Professor Anders Biel from Karlstad University in Sweden and the Swedish company Lamera from...

Im Focus: Controlling superconducting regions within an exotic metal

Superconductivity has fascinated scientists for many years since it offers the potential to revolutionize current technologies. Materials only become superconductors - meaning that electrons can travel in them with no resistance - at very low temperatures. These days, this unique zero resistance superconductivity is commonly found in a number of technologies, such as magnetic resonance imaging (MRI).

Future technologies, however, will harness the total synchrony of electronic behavior in superconductors - a property called the phase. There is currently a...

Im Focus: How Do the Strongest Magnets in the Universe Form?

How do some neutron stars become the strongest magnets in the Universe? A German-British team of astrophysicists has found a possible answer to the question of how these so-called magnetars form. Researchers from Heidelberg, Garching, and Oxford used large computer simulations to demonstrate how the merger of two stars creates strong magnetic fields. If such stars explode in supernovae, magnetars could result.

How Do the Strongest Magnets in the Universe Form?

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

International Symposium on Functional Materials for Electrolysis, Fuel Cells and Metal-Air Batteries

02.10.2019 | Event News

NEXUS 2020: Relationships Between Architecture and Mathematics

02.10.2019 | Event News

Optical Technologies: International Symposium „Future Optics“ in Hannover

19.09.2019 | Event News

 
Latest News

New material captures carbon dioxide

15.10.2019 | Materials Sciences

Drugs for better long-term treatment of poorly controlled asthma discovered

15.10.2019 | Interdisciplinary Research

Family of crop viruses revealed at high resolution for the first time

15.10.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>