By Dr.-Ing. Walther Koch (auth.)

Show description

Read or Download Erdungen in Wechselstromanlagen über 1 kV: Berechnung und Ausführung PDF

Best technology books

Teaching with iPad How-to

Shubhangi Harsha and Sumit Kataria, "Teaching with iPad How-to"
English | ISBN: 1849694427 | 2012 | eighty four pages | PDF | five + nine MB

Use your iPad creatively for daily educating projects in faculties and universities

Overview
Plan your classes on iPad and percentage notes quickly
Use particular iPad 3D assets for extra enticing learning.
Use your iPad for growing and giving presentations.

In Detail

The iPad is a brilliant educating software. it really is an awesome eReader for getting access to textbooks and journals. it's also nice for multimedia content material like video clips, audio, displays, and 3D animations. most significantly Apple's app surroundings makes it very strong. you will discover apps for nearly any instructing job in app shop and use them instantly.

You will commence with easy projects like developing shows and visualizations. quickly you can be making interactive books and assets in addition to educating useful classes corresponding to song and artwork! .

"Teaching with iPad How-to" begins with the main simple job of making plans your classes. As you wade through the publication you'll find out how to 'carry' your textbooks on Little Books, create your individual assets and at last post your courseware.

Be it organizing your notes, developing charts and shows, or simply recording attendance, this publication may help you do a majority of these initiatives very successfully in your iPad. during this ebook, additionally, you will learn how to create and distribute timetables, create your personal textbooks and make your periods fascinating and entire of knowledge through the use of the iPad’s 3D and subject-specific resources.

You will discover ways to make your educating task attention-grabbing and fascinating to your scholars through the use of iPad as your educating and organizing tool.

What you'll research from this book
Planning your daily classes at the iPad and growing shows and charts
Managing attendance files and pupil profiles at the iPad
Organizing your notes and sharing them via your iPad in addition to wearing your textbooks in your device
Creating and coping with your timetable at the iPad
Projecting the content material of your iPad on a wide reveal and interacting together with your category alongside
Creating and publishing your individual interactive books and instructing resources
Teaching scholars with designated wishes in a truly potent manner

Approach

Teaching with iPad How-To is a crisp and systematic consultant geared up into a variety of step by step recipes that would allow you to make the most of the ability of your iPad to make your day-by-day educating projects effortless and interesting.

Who this publication is written for

This publication is perfect for college and college academics who've entry to an iPad and are prepared to make their occupation all of the extra enjoyable and straightforward for themselves. it truly is assumed that the reader has easy wisdom of the way to exploit the iPad, entry the Appstore and obtain apps.

Space Technology Export Controls and International Cooperation in Outer Space

Export controls definitively impression overseas cooperation in outer house. Civil and advertisement area actors that interact in foreign endeavors needs to conform to area know-how export controls. within the basic discourse, contributors of the civil and advertisement house group understand their family export keep an eye on regime.

Obfuscation: A User's Guide for Privacy and Protest

With Obfuscation, Finn Brunton and Helen Nissenbaum suggest to begin a revolution. they're calling us to not the barricades yet to our desktops, delivering us how you can struggle today’s pervasive electronic surveillance—the number of our facts via governments, businesses, advertisers, and hackers.

Introducing technology computer-aided design (TCAD) : fundamentals, simulations and applications

This would be the 1st e-book that bargains as a rule with the 3D expertise computer-aided layout (TCAD) simulations of significant cutting-edge pressure- and strain-engineered complex semiconductor units: MOSFETs, BJTs, HBTs, nonclassical MOS units, finFETs, silicon-germanium hetero-FETs, sunlight cells, energy units, and reminiscence units.

Extra resources for Erdungen in Wechselstromanlagen über 1 kV: Berechnung und Ausführung

Example text

Bodenwiderstandes vorgetäuscht werden. Auch bei Ausschachtungsarbeiten besteht die Möglichkeit, in größeren Tiefen unter der Bodenoberfläche zu messen. ErdungsanlBgen (§ 8 VDE 0141) 33 Nun ist der Bodenwiderstand, wie vorerwähnt, von dem Feuchtigkeitsgehalt abhängig. Bei Oberflächenmessungen mUß man demnach die Witterungsverhältnisse berücksichtigen. Messungen bei stark durchfeuchtetem Boden tragen die Wahrscheinlichkeit zu günstigen Leitwertes, d. h. zu knapp ausfallender Erdungen in sich. Richtig ist daher, Oberflächen messungen stets nach einer Trockenperiode zu machen.

Daher wäre es falsch, hier einen Zusammenschluti mit der Schutzerdung der zugehörigen Anlage über 1 kV zu machen, zudem entspräche der Zusammenschluß nicht dem Sinn der Vorschrift, da eine gleichzeitige Berührung der Metallteile des Schaltkastens aUßerhalb des Transformatorenhauses mit den geerdeten Teilen der. Anlage über 1 kV innerhalb des Transformatorenhauses nicht ohne weiteres möglich ist. Sache des Erbauers der Anlage ist es zudem, darauf zu achten, daß auch kein Zusammenhang über metallene Bauteile besteht.

DQ=j2·dR·t=j2. ~·t· ltd" ' 2 diese Wärmemenge soll nach obiger Annahme in der Erdschicht gespeichert werden. Ist c deren spez. Wärme in e-- und y deren W: g' Dichte in-~ 3 cm so ist andererseits in dem Volumen der Schicht gespeichert 00' d Q=c·y·d V· (T -To}=c'y' -2-dx·(T-To) worin T - T 0 die Temperaturzunahme ist. Da beide Formeln gleichen Wertes sein müssen, wird p. ;rr: d 2 (T-T o} dx oder ~=,rc-:-r:-1'-To' ltd' --;;--8- - - t - r Für Erdreich ist das Produkt C· ,,'= 1,67 I A cm" (17) ----~~cm" oe Bei einem Temperaturanstieg T- T 0 = 50°C tritt selbst im angewärmten Erdreich zur Sommerzeit eine Verdampfung der Feuchtigkeit nicht ein.

Download PDF sample

Rated 4.69 of 5 – based on 40 votes