Smart grid currently is often regarded as a topic requiring lots of highly advanced new equipment and a lot of communication in between the different stations.
However, in Germany a quite pragmatic solution is gaining significant ground: The variable ratio distribution transformer, either using...
I'm using ceramic capacitors in an application where they have to supply high pulse currents at a repetition rate in the audible frequency range (several amp for about one microsecond out of an 1uF X7R surface-mount capacitor). When I operate my circuit I can hear a humming sound generated by...
The case of an electrolytic capacitor is usually connected to one of the terminals.
As far as I know this is always the negative terminal.
One of our suppliers of SMPS claims that the type he uses has the positive terminal connected to the case.
Can this be true ?
All types of RF Power Mosfets (up to 100 MHz) I know use an isolation (Al2O3 AlN or BeO) between the die and the case.
Does someone know Mosfets without this isolation (maybe types obsolete today)?
I'm searching for a device suitable for checking the phase sequence on ungrounded three phase systems up to a voltage of 750 V or higher.
The devices easily availbable only work on grounded systems (Two terminal devices like the DUSPOL from Benning) and the three terminal devices I found are...
In Europe the Buchholz relay is a very common protection device for oil-filled transformers, even for small (several 100 kVA) power ratings. It looks like that in other parts of the world the Buchholz relay is also known, but not very common. I would like to know if my assumption is correct at...
In the past years lots of german universities introduced Bachelor and Master Courses additionally to the courses leading to the traditional german degree Dipl.-Ing.
They claim that this will lead to better career opportunies for german engineers outside Germany.
To my experiece the traditional...
Ceramic Capacitors with X7R or Z5U ceramic are widely used for decoupling the supply of integrated circuits. Does anyone have data on failure mechanism and failure rate of such capacitors.
Does anybody know a standard which specifies short-circuit withstand capabilty for primary connections inside of a large power transformer (cast resin) in case of a fault in the primary winding? Does anybody have experience with such a fault where this fault caused more severe problems due to...
Can someone recommend a textbook giving design guidelines for designing busbars for high-current AC applications (currents up to several 10 kA at frequencies of 250 Hz and above)
