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In high power TEA CO2 laser system, liquid crystal display (LCD) module is a key device for display and control functions. Because of laser's harsh electromagnetic environment, LCD module coupled to the electromagnetic interference easily, leading to not work normally. This paper analyzed the interference coupling mechanism. On the basis of the analysis results, LCD module's field-line coupling is...
The wide-band frequency electro-magnetic (EM) noise is generated during turn-on and turn-off processes of thyristor valves in converter stations. It will be conducted along the primary circuitry, and may interfere with secondary systems by the way of conducted and radiated coupling. The plusmn800-kV UHVDC transmission project is one of newly developed technique and used barely in the world. The electro-magnetic...
To research the effect of temperature and humidity on radio interference generated from UHV DC transmission lines, a mini corona cage has been constructed and put in a manual environment room, which temperature and humidity can be controlled. At the same time, a radio interference performance measuring system by using loop method has been set up too. The radio interference generated from a copper...
To study the corona performance of full scale UHV DC transmission line, a 4 m long, 2 m times 2 m corona cage has been constructed. At the same time, a corona performance measuring system consists of audible noise level meter, EMI receiver and ultraviolet imaging telescope has been set up too. Audible noise level, radio interference level and total of ultraviolet photon of a 4 times 500 mm2 transmission...
The wide-band frequency EM noise is generated during the processes of firing and turn-off of thyristor valves in converter stations. It will be conducted along the primary circuitry, and may interfere with secondary systems by the way of conducted and radiated coupling. The plusmn800-kV UHVDC transmission project is one of newly developed technique and used barely in the world. The EMI problem is...
As the need for electric power grows continuously, transmission systems with more delivery capability, such as HVDC lines, are also needed. However, one of the biggest obstacles to construct a new transmission system is the obtaining of sufficient right-of-way, due mainly to the economical and ecological reasons. As a consequence, ac and dc transmission lines are to be built in parallel sharing the...
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