Development Trend of Electronic Transformers
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The emergence of electronic transformers, known as the beginning of the century a revolution in high-voltage electrical appliances industry. Its digital output, network connection makes the network more secure, more environmentally friendly and more conducive to a device and the whole transmission and distribution systems, intelligent. Electronic Transformers, compared with the conventional transformer has the following characteristics:
Small-signal transmission instead of power output transformer miniaturization, low power technology enables the original or even hundreds of kilograms of the weight of tons of reduced to a few kilograms.
Optical isolation to replace oil, gas insulation. Stand-alone high-voltage transformer used between a second optical digital connection, instead of complex and expensive optical isolator oil and gas insulation system, which is a revolutionary change, so the higher the voltage, the higher cost transformer.
Replace the analog output of digital output for easy follow-up network connection and intelligence processing, optical fiber transmission, have a stronger resistance to electromagnetic interference.
Data sharing over the network instead of winding in parallel connection. Electronic Transformers single-point measurement data can be transmitted via Ethernet, which was shared in the power plant can save a large number of parallel cables.
Application
Statistics show that China currently has about a hundred units in the new electronic transformer exploratory research and development, initially supply capacity of about 10 or so categories are more complete, can now fully supplied with 3 | 5 . Products involving 10 to 800 kV, current, voltage, stand-alone, combination electric type, and so different varieties.
Since 2004, active electronic optical transformer transformer to enter the market before the application of active electronic transformer high-voltage side to the current signal is converted to digital signals transmitted via fiber-optic ground potential, such as optical sensing scheme, as implemented optical isolation between the high and low voltage insulation, plus the ease of industrial mass production, has become the dominant type of transformer.
During the same period, China developed a more practical "self-encouragement source" technology to active-type changed to a "quasi-passive" structure. This program can greatly simplify the transformer, and fundamentally improve the reliability and life cycle.
Soon, a small power points for electronic pressure "and other potential cavity" partial pressure structure in our midst, it has a high insulation safety and accuracy indicators, which can replace the conventional reliance on oil, gas insulated transformer. This technology is particularly suited to high pressure, ultra high voltage dry-type of voltage divider structure is a from China's new electronic voltage transformers.
In order to overcome vulnerability to temperature measurement performance, vibration stress, at present, optical program has been improved by the ring as a fiber optic glass sensor, makes optical program to board a new technology platform, is more close to practical requirements, which class known as fiber-based electronic transformer has a small amount of trial and need further to overcome the structural complexity and high cost problems.
Application of the main problems facing the
Electronic transformer assembly to change the original application form, such as microelectronic devices has been moved forward to the outdoor environment of power lines, Isolating Switch, circuit breaker and so strong interference near the source, must withstand severe weather conditions and irregular strong electromagnetic interference test, we now have electronic transformer development and application of the main problems facing are: electromagnetic interference protection, communication error control, reliable power supply means and to adapt to the outdoor environment, if the measures are inappropriate, easily lead to signal failure to protect the miscarriage of justice, corrosion and aging .
Solve these problems, we need to perfect the testing, inspection and related standards, to promote Electronic Transformer attention next to the high reliability, high stability and direction of tilt.
Future research directions
Sensing passivity: passive sensing mode as with technical superiority, the stand-alone ECT sensor components will tend to passivity, including active sensors will get rid of dependence on outside resources to achieve self-powered, to quasi- passivity, thus, the average life cycle of electronic transformer will be more than 10 years. Optical sensors measure by increasing its performance, simplify system architecture, reduce costs, access to utility.
Structural combinations: the use of electronic micro-power, small size advantage, transformers more combinations of components in the transformer, closed composite electric, separate knives and other combination of appliances, the reduction of an area, reduce the cost, but also through functional complex with for a small appliance itself, and intelligent. Various programs to play their respective advantages, will be combined with each other, complement each other, in addition to the emergence of various independent, closed the current - voltage transformer combination, the next few years, expect to see LPCT / ROG-CT and optical portfolio edition of Current Transformer.
Functional multiplexing: the advantages of the full use of data sharing, single point measurement can be more sharing, transformer while providing Goose, RS485, MU and other different types of digital interface for a variety of monitoring equipment sharing, reduced duplication install more transformers , making the equipment more compact configuration.
Standard parts: transformer parts standardization, has the versatility and interchangeability, as a standard accessory "plug" type of a device installed in a variety of different manufacturers can change and swap transformer. |
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Author Resource:-
I am a editor, http://www.hardware-wholesale.com provides reclining office chair,boss office chairs, welcome to visit!
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By :
Jessie Stone
Submitted
2010-09-26 10:40:10 |
Article From Article Mayhem
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