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 Scientists from Hannover develop a novel lightweight production process
27.09.2017 | IPH - Institut für Integrierte Produktion Hannover gGmbH

nachricht PRESTO – Highly Dynamic Powerhouses
15.05.2017 | JULABO GmbH

All articles from Machine Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

Im Focus: Successful Mechanical Testing of Nanowires

With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong

Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Long-lived storage of a photonic qubit for worldwide teleportation

12.12.2017 | Physics and Astronomy

Multi-year submarine-canyon study challenges textbook theories about turbidity currents

12.12.2017 | Earth Sciences

Electromagnetic water cloak eliminates drag and wake

12.12.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>