Electrical Engineering

A Electrical Engineering guide, with links, news, and comments. EE is a professional engineering discipline that deals with the study and application of electricity, electronics and electromagnetism.

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500mW FM PLL Transmitter 88-108 MHz

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fmtvguide on

From: fmtvguide.blogspot.com

FM transmitters have always been fascinating and one can find thousand examples of them on the internet. Sadly most of them are full of error and miss leading information. Most of them also have low stability and frequency drift, many coils and components which are difficult to find. The output power is often set to several watts with just a transistor or two…..can't fool me. So therefore I decided to construct a simple transmitter with great performances. Some construction achievements I wanted were: # Simple construction # Commonly components # High quality and stability # Low number of coils # High output power The ... Read Full Story

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Core Balance Current Transformers

Written by

pjjayanth on

From: www.electrotechnik.net

The CBCT or the Core Balance Current Transformer is a current transformer is used for earth fault protection in grounded three phase systems. It is also known as the zero-sequence current transformer. The CBCT is a current transformer through all the three phases are made to pass as in the diagram. Thus the magnetic fluxes caused by the three phase currents cancel each other. The net resultant flux being zero does not induce any current in the secondary of the transformer. Thus the secondary current of the CBCT when all the three phases are healthy is zero. When an earth fault occurs in one ... Read Full Story

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Checking the Polarity of Current Transformers

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pjjayanth on

From: www.electrotechnik.net

The Polarity of current transformers is extremely important. Just like a battery, a current transformer too has a polarity. The polarity determines the direction of the secondary current in relation to the primary current. Wrong connection of the current transformers can cause false operation of the protection relays. Hence, it is vital to ensure that the current transformers are connected with the correct polarity. The following figures shows a setup to test the polarity of a current transformers. A DC source is connected with the positive terminal to P1 and the negative terminal to P2. An analog voltmeter is connected to the secondary terminal ... Read Full Story

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Overfluxing in Transformers

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pjjayanth on

From: www.electrotechnik.net

The transformer works on the principle of mutual induction between the primary and secondary windings. The induction is caused by the constantly varying magnetic flux that links the two windings. The flux density in the windings is directly proportional to the induced voltage and inversely proportional to the frequency and the number of turns in the winding. Magnetic Flux α Voltage/Frequency Overfluxing is a dangerous situation in which the magnetic flux density increases to extremely high levels. The high flux density can induce excessive eddy currents in the windings and in other conductive parts inside the transformers. The heat generated by these eddy currents ... Read Full Story

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Classification of Relays

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pjjayanth on

From: www.electrotechnik.net

Relays can be classified on the basis of their function into five broad categories. They are Protective, Regulating, reclosing synchronism Check and Synchronizing, monitoring and Auxilliary. Protection Relays Protection relays are used in generators, transformers, feeders, transmission lines, etc. The primary function of these relays is to continually monitor a specific parameter such as current, voltage or power and to generate alarm/isolate the system or device in the situation of deviation from set limits for the parameter or a fault. For instance, an overcurrent relay may be programmed to operate when the current in a feeder exceeds a certain predetermined limit. These relays generally ... Read Full Story

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OpenVPX-based radar signal processing provided by Mercury for major radar...

OpenVPX-based radar signal processing provided by Mercury for major radar ...Military & Aerospace ElectronicsMercury Computer Systems Inc. in Chelmsford, Mass., is providing signal processing based on the company's OpenVPX Ensemble 6000 products to a defense ...Mercury Computer Systems, Inc. F1Q10 (09/30/2009) Earnings Call TranscriptSeeking Alpha (blog)Mercury Computer Systems Receives Order for Global Radar System UpgradeTransWorldNews...

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Invensys Operations Management Wins 2009 Control Engineering China Award...

Invensys Operations Management Wins 2009 Control Engineering China AwardTechnology Newsroom (press release)“It is a significant achievement to be selected by the readers of Control Engineering China for this award,” said Ram Guduru, vice president for indirect ...and more »

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New Raymarine HD Digital Radomes Offer Superior Digital Signal Processing and...

New Raymarine HD Digital Radomes Offer Superior Digital Signal Processing and ...ReutersThese highly advanced radomes are engineered with the same exclusive HD Digital signal processing technology found on Raymarine's larger open array radar ...and more »

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PNC Faculty Members Publish Research Paper

Help Net SecurityPNC Faculty Members Publish Research PaperValpoLife.com (blog)This is considered to be the most prestigious journal, in the area of digital signal processing. IEEE is the world's largest professional association ...How to Protect Personal InformationEarthtimes (press release)all 4 news articles »

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Mercury Computer Systems to Deliver OpenVPX-Based Signal Processing Solution...

Mercury Computer Systems to Deliver OpenVPX-Based Signal Processing Solution ...ReutersLeveraging the design principles of the OpenVPX System Specification, Mercury is able to deliver superior signal processing capability in a heterogeneous ...

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