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Electrical Engineering Links

tarih: Eylül 26, 2018

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Testing Measurement Troubleshooting Maintenance

http://www.testguy.net/library/

General Stuff

http://www.ieee-tpc.org/tutorials.htm

3-http://amasci.com/ele-edu.html

4-http://www.ami.ac.uk/courses/topics/

5-http://www.teias.gov.tr/ebulten/makaleler/

Here you are! Electrical Engineering Links for you to read..

Electrical Power
www.powerwatch.org.uk/library/index.asp

www.idc-online.com/conference-papers

Fiber Optics

http://www.fibersystems.com/pdf/whitepapers/Basics-of-Fiber-Optics.pdf

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The Construction and Laying of the Foundation Earthing Conductors

A foundation earth consists of non-insulated conductors usually made of strip or round steel, which is embedded in the foundations of the outer walls or in the baseplate of the building and over the relatively well conductive concrete over a large area in contact with the earth. It shall be designed as a closed ring and connected to the main equipotential bonding rail, usually in the service connection room, via a conspicuously marked, corrosion-protected connection lug (hot-dip galvanized steel with plastic jacket or stainless steel) of at least 1.50 m in length. For the lightning protection further connection lugs are to be provided. Foundation earthing is made under a building to ensure the electrical safety. The galvanized or non-galvanized steel must be surrounded on all sides by at least 5 cm of concrete. Thus, a high corrosion resistance is achieved, which practically corresponds to the life of the building. Round steel should be at least 10 mm in diameter. Strip steel...

Distance Protection ( According to ANSI 21 )

Distance protection uses both current and voltage to detect errors. From these two sizes, the impedance (continuous) is continuously calculated. Distance Protection Relay Installation on Transmission Lines In the event of a short circuit, the voltage suddenly collapses and a high current flows. This causes a small impedance according to the formula Z = U / I. (The ideal short circuit takes place at U = 0) A trigger time (eg 0 - 2 Ω → 0.2 s | 2 - 4 Ω → 2.5 s) is assigned for any impedance zone. A distance protection relay thus offers multiple triggering times. (Since the impedance value is determined by the line or cable part on which the current flows along the distance up to the fault point).Again, while the direction of the fault is detectable, a fault in the forward direction of 0.10 ohms, for example, can be separated from the mains within 0.05 seconds while this can be determined as 1.5 seconds for a fault in the reverse direction with the same impedance

Considering When GaN is Used Instead of LDMOS

GaN is considered to be the modern technology and material foundation when it comes to developing power amplifiers. In turn, LDMOS is the mass-market technology that has served in many commercial applications in the form of transistor amplifiers. But with which motivation is there now a change in a new design? Gallium nitride as a III-V semiconductor has some physical properties that become evident in the design of a transistor. Some points are worth mentioning: The power density is higher with GaN compared to LDMOS, which physically leads to a mechanically smaller transistor chip, with higher output power. The efficiency is higher, which means less loss of power, thus less cooling costs. Thus, smaller heat sinks withs maller fans are used, which in turn saves costs as well. GaN is a material with a large electronic band gap, which in the case of transistors leads to the fact that large drain voltages can be applied. GaN- based ...

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