Hitachi was founded in 1910 by electrical engineer Namihei Odaira. The company’s first product was Japan’s first 5-horsepower electric induction motor, initially developed for use in copper mining. Odaira’s company soon became the domestic leader in electric motors and electric power industry infrastructure
Hitachi J100 adjustable and Variable frequency drive. Photographed by C J Cowie
In 1876, Thomas Alva Edison opened a new laboratory in Menlo Park, New Jersey. Out of the laboratory came arguably the most famous invention of all-a practical incandescent electric lamp. By 1890, Edison had organized his various businesses into the “Edison General Electric Company.”
“Charles Proteus Steinmetz, already a distinguished industrial scientist, was hard at work as GE’s chief consulting engineer. After years of persuasion, Steinmetz convinced the GE leadership that the company would need a research laboratory to maintain its edge in lighting and electricity and also finding new areas to grow.” – Heritage of Research
Siemens is one of the world’s largest technology companies. Siemens has six major business divisions: Communication and Information, Automation and Control, Power Generation, Transmission and Distribution, Transportation and Automotive, Medical, and Lighting.
Siemens & Halske was founded by Werner von Siemens and Johann Georg Halske on 12 October 1847. Based on the telegraph, his invention used a needle to point to the sequence of letters, instead of using Morse code. The company, then called Telegraphen-Bauanstalt von Siemens & Halske, opened its first workshop on October 12. – Wikipedia – Siemens
Analog Integrated Circuits 1976 – Siemens
In 1999, Siemens’ semiconductor operations were spun off into a new company called Infineon Technologies.
In 1881, a Siemens AC Alternator driven by a watermill was used to power the world’s first electric street lighting in the town of Godalming, United Kingdom.
Complete and integrated line of products, systems and solutions for production and process automation. Customized automation solutions based on Totally Integrated Automation (TIA) and Totally Integrated Power (TIP).
Electromagnetic interference (or EMI, also called radio-frequency interference or RFI when in radio frequency) is disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source.
Who would know better about Radio Frequency Interference and ElectroMagnetic Interference more than the Hams or Amateur Radio Community.
If they have to communicate effectively using limited resources, they have to deal with EMI/RFI effectively, While they build their equipment or combat Noise from other Machines and Installations nearby.
This problem needs more practical involvement and experimentation to learn, compared to learning something like Digital Electronics.
Equipment and Electricals like SMPS, AC/DC Drives, Motors, Solenoids and CFL Lamps are to be built/reinforced for low EMI/RFI emission/radiation.
Sensitive Medical Equipment like ECG or even a Aircraft can be seriously affected by Noise.
“Earth leakage currents arise mainly from the EMC filters built into electronic equipment with switched mode power supplies. Standards limit the leakage current from non-fixed equipment (i.e. equipment that plugs into a standard socket outlet) to less than 3.5 mA. When a lot of electronic equipment is in use, the total leakage current in the protective conductor can become significant.”
The PQ E-library is a collection of electronic technical reference documents covering introduction, costs, harmonics, resilience, voltage disturbances, earthing, energy efficiency and renewables/distributed generation
Copper Development Association
Computers cannot work without copper
Electricity in buildings
Copper Development Association Website for information on Copper and Copper Alloys
Supplementary to EMI/RFI/EMC Immunity of an Equipment. Many Installations are subject to Highly Disruptive Electrical Environment not just EMI. Depending on the budget and the situation a solution has to be found. Sometimes a CVT or an Isolation Transformer can do a lot of good. Converting all Energy inputs to battery energy and having a Isolated Synthetic Sine Supply may be an expensive but good solution. Either way the devices that face the harsh environment have to be over rated along with these protections.
Abstract-This study examines the design and construction of AC Electronics load surge protection in order to carry electric surge load arisen from faults in low voltage electricity system (single phase/220V) by using the principle of electronics load clamping voltage during induction period so that electric voltage could go through to safe load and continue to work. The qualification of the designed device could prevent both transient over voltage and voltage swell.
See a product from the MTL Instruments Group. They have a Comprehensive range of surge protection devices offering solutions for all mains power, process control, network and communications, telecom, wireless and RF systems.
The ZoneMaster Series is available in units with either a 200 or 170kA surge handling capability. ZoneMaster is engineered to protect the most critical electronic systems, suppressing surges at the main service panel.
Twitter Interface – @EMergeAlliance – Promoting adoption of Safe Low-voltage DC Interior Power Distribution.
Occupied Space: The first available EMerge Alliance Standard creates a 24-volt DC microgrid for use in commercial interiors, featuring safety and flexibility along with efficiency benefits. See Registered Products.
Data Centers: A 380-volt DC power standard focused on data center and telecommunication applications is under development. View Presentation.
EMerge Alliance 24 volt DC power system demo at Greenbuild 2009. Demo features ceiling grid, lighting, sensors and controls