What do you know dry-type transformers
As we all know, the transformer is divided into dry-type transformer and oil-immersed transformer, oil-immersed transformer article we have introduced in detail, so we will continue to learn the relevant knowledge of dry-type transformer today, believe that if you patiently read this article about dry-type transformer, will gain.
What is a dry-type transformer?
Simply put, the dry-type transformer refers to the core and winding transformer not impregnated in the insulating oil, which is widely used in local lighting, high-rise buildings, airports, wharf CNC machinery and equipment and other places. The cooling mode of the dry-type transformer is divided into natural air cooling (AN) and forced air cooling (AF). In natural air cooling, the transformer can operate continuously for a long time at the rated capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation or emergency overload operation; the load loss and impedance voltage increase should not cause long continuous overload operation.
What is the working principle of the dry-type transformer?
dry-type transformer input voltage of 200V or 400V access to the supporting control box (table), adjust the input voltage to the test transformer primary winding (low voltage), using the principle of electromagnetic induction, in the secondary winding (high voltage) according to the ratio of the primary winding turns can obtain the same multiple of output high voltage, from zero continuously adjustable to the highest value. In the DC voltage withstand test and leakage current test, as long as the high voltage silicon reactor is installed on the high voltage output end, you can obtain the DC high voltage, its amplitude is 1.414 times of the power frequency high voltage value.
Development of dry-type transformer
China has become the world's largest dry change production and sales of the country. At present, all kinds of foreign high and low voltage electrical products, occupy some important domestic markets, but the dry-type transformer from the end of the 20th century, almost no imported from abroad, in the domestic key projects and major projects, it is hard to find foreign dry-type transformer.
At present, the pace of urban and rural power grid construction is accelerating, and China's electricity generation and electricity consumption are increasing. Generally, every 1kW of additional total transformer capacity requires 11kVA; the Satons distribution transformer accounts for about 1 / 3-1 / 2 of the total transformer capacity. It is estimated that dry-type distribution transformers account for about 1 / 5-1 / 4 of all distribution transformers. Driven by the investment in power grid construction, the transformer industry has a high prosperity, and the output will maintain a growth rate of about 20% after 2010. According to historical experience and transformer voltage grade structure changes, the proportion of distribution transformer is about 40%, according to the proportion of 40% calculation, this year China's new dry-type transformer output will reach about 200 million KVA.
In the past 20 years, with the development of the world economy, dry-type transformer has achieved rapid development in the world, especially in the distribution transformer, dry-type transformer in the proportion of more and more large, according to statistics, in Europe and the United States and other developed countries, it has accounted for 40~50% of the distribution transformer. In China, it accounts for about 50%. From the perspective of output, China since the second urban network transformation conference in 1989, the output of dry-type transformer has increased significantly, since the 1990s, roughly 20%, the total output in 1999 has approached 10,000 MVA (the value has greatly exceeded the forecast 10 years ago 405 MVA), and the total output in 2002 reached 20,000 MVA, 2004 has reached 32,000 MVA. Such a growth rate is also unprecedented in the world.
It can be seen from the above data that China has become one of the countries with the largest dry-type production and sales volume in the world, and has been in the world's leading level in terms of factory scale, product capacity, voltage and other aspects. So for dry-type transformer process production level and production strength, domestic has many very good suppliers, such as SHZ Power is a professional Chinese dry-type transformer manufacturers, if you want to know more about dry-type transformer, want to find high quality dry-type transformer, welcome to send E-mail query at any time.
