The role of the current transformer is used to measure the larger current

Current transformer is a kind of current commutation device,symbols for CT.Its role is to put the large current into a small current,supply measuring instrument and relay the current chart,indirect measurement by large wholesalemotor.blogspot.com current.But also can isolate high voltage,to ensure the safety of staff and secondary equipment.Current transformer secondary side current is 5 Why can't a current transformer secondary side circuit? Current transformer secondary side is not allowed to open operation.In the current transformer secondary coil on the instrument coil impedance is small,the equivalent of running in the secondary coil short- circuit condition.Transformer secondary coil terminal voltage on only a few volts.Of the magnetic flux in core is motor vehicle very small.Although primary coil magnetomotive force can reach hundreds or thousands of Ann ampere-turns or larger.But most were established by short circuit secondary coil demagnetization magnetomotive force offset,only a small fraction of excitation magnetomotive force as the core to establish a magnetic flux in the core.

If in running the diesel generating secondary coil disconnection,vice side current is equal to zero,then the demagnetization effect of magnetomotive force disappears,and the original edge of magnetomotive force is constant,the original edge measured current all become excitation current,this will make the iron core of sharp,magnetic flux core severe fever that burn out the coil insulation,or make the high side of short circuit.Other secondary coil open out the high voltage is induced,it is very dangerous for instrument and operators so current transformer secondary side is not allowed to disconnect. Why can't a voltage transformer secondary side short circuit? If the short circuit in the operation of the secondary 220v ac electric motors side of voltage transformer,secondary coil impedance decrease greatly,can appear a lot of short circuit current,make the secondary coil burned due to severe fever.So in the operation of the transformer are not allowed to short circuit.General voltage transformer secondary side with a fuse.Only transformer of 35 kv and below,on the high side have a fuse when transformer short-circuit the purpose is to put it cut off from the high voltage circuit

Variable frequency speed control system

At present, the domestic research in variable frequency speed regulation system is www.dongfeng-motor.com very active, but also is not very ideal in terms of industrialization, most of the market is still dominated by foreign companies. Therefore, in order to speed up the development of variable frequency speed regulation system of our country, the needs of the international development trend of variable frequency speed regulation technology and the domestic market demand have a comprehensive understanding. The energy industry as the foundation of the national economy, for the development of society, economy and the improvement of people's living standard is very important. In the rapid growth of economic environment, China's energy industry faced with dual pressure of economic wholesalemotor.blogspot.com growth and environmental protection. The data show that, under the influence of capital, technology, energy prices, China's energy efficiency is much lower than the developed countries. Energy-intensive products of China in the 90 s energy is generally higher than in developed countries 12% to 55%, more than 90% of the energy in the mining, processing and transformation, in the course of storage and transportation and terminal diesel generators prices loss and waste.

 If the energy consumption per unit GNP (tons of standard coal/thousand dollars) country (mid - 90 - s), China respectively is Switzerland, Italy, Japan, France, Germany, Britain, the United States, Canada, 14.4 times, 11.3 times, 10.6 times, 8.8 times, 8.3 times, 7.2 times, 4.6 times and 4.2 times. In 1995, China's coal-fired power plant coal consumption of 412 grams of standard coal/kWh, 1.27 times that of the international advanced level. Therefore, the effective use of energy in our country is very urgent. As one of the large energy consumption of the motor in the aspect of energy saving is a potential can be dug. Total installed capacity of 400 million kilowatts of electric motor in our country, 600 billion KWH, electricity consumption accounted for about 80% of the industrial electricity consumption. In all kinds of used motor, more than 80% for small and medium asynchronous motor motor lamination under 0.55 220 kw. Overall equipment level in motor system in China is equivalent to the level of developed countries' 50 s. Therefore, 15 plans in the country, the motor system energy saving investment up to 50 billion yuan, so the variable frequency speed regulation system in our country will have a huge market demand. The current global economic development, there are two significant interwoven lines: energy and the environment. Energy of tension is not only restricted the considerable economic growth in developing countries, also brought quite a big problem for many developed countries. Where energy concentration also tend to be the focus of the world's hot spots. And the development and utilization of energy and protecting the environment has a significant impact. Global warming, acid rain, and a series of environmental disasters are related to the development and utilization of energy.

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