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

The classification of electrical fault

According to the composition characteristics of electrical devices,from looking for electrical fault,from the viewpoint of the common electrical fault can be divided into three categories: 1.The power failure: lack of power,voltage,frequency deviation,the polarity of by phase line and neutral line and reverse,the lack of a power supply,phase sequence change,ac/dc mixed.2.The circuit fault: break,electric vehicle motor short circuit,short,grounding,connection error.3.The equipment and component failure: overheating burned,can not run,electrical breakdown,performance becomes worse.According to the fault phenomena analysis the cause of the problem,the key is to find electrical fault.Is based on the analysis of the basic theory of electrician,is for the electrical device structure,principle,performance,fully understand,ac electric motor is with the combination of the actual fault.


The causes of an electrical fault may be a lot of,it is important to find out the main reason in many reasons,and use approach to troubleshooting.For example,a three- phase cage asynchronous motor fault functioning,whatever the case,is the most concentrated performance motor does not work,but is not necessarily in the motor fault,and may be a power failure,may also be the failure of circuit or equipment and components.That is to say,the same failure form,failure of a variety of reasons.In these reasons,which is what reasons make the motor can't work,even after a deeper and more detailed analysis.For example: if the motor is used for acmotortrading.blogspot.com the first time,it should check power supply,circuit,the motor and load analysis; If the motor is used for the first time after repair,it should start from the motor itself check analysis; If the motor is running for a period of time suddenly can't run,it should check points off power supply and control components.Through the above process,then determine the specific cause of motor fault.

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.

Ac motor

To realize the mechanical energy and electrical energy transformation of mini electric motor mechanical communication. Ac motor is the most commonly used motor. Due to the status of the motor can pass, the same motor as a generator and motor. Ac motor according to the varieties could be divided into two types: synchronous motor and induction motor. Synchronous motor rotor rotational speed n s the same as the rotating magnetic field rotation speed, is called the synchronous speed. N s and pick up the frequency of the alternating current polarity logarithmic relationship between p and f motor for n s = f/p. In China, the power frequency 50 hz, so two pole motor synchronous speed is 3000 RPM, quadrupole motor synchronous speed is 1500 RPM, and so on. The speed of the rotor asynchronous motor is wholesalemotor.blogspot.com always less than or more than the speed of the rotating magnetic field, the difference between the two (called slip) usually within 10%. 

The speed of the ac motor (either synchronous or asynchronous) the restriction of the power frequency, and speed control is difficult. Ac motor generally adopts three-phase system, because of the three-phase ac motor compared with the single phase motor, no matter in such aspects as performance index, raw material use and price has obvious advantages. Large capacity synchronous motor are turning pole type, namely the rotor magnetic pole, is produced by passing a dc excitation winding, and synchronous machine very logarithm is the logarithmic rotor magnetic pole. Eight pole motor rotor is eight pole, 2 p = 8, namely the motor with 4 poles. Steam turbine generator is non-salient pole Dongfeng Electric type motor, more commonly a logarithmic rarely, generally for 1, 2, and n = 60 f/p, so his speed is high, up to 3000 RPM (frequency), and the number of considerable ac electric motor hydro-generator, for salient pole rotor structure, the process is more complex, because the number of his lot, so he has a very low speed, maybe only a few turns per second.

Brushless synchronous generator is how to generate electricity?

Three-phase brushless synchronous generator excitation system are connected by a coaxial communication issue of ac exciter,after rotating rectifier rectifier for direct current (dc), Then sent to the generator exciting winding. Ac exciter is rotating armature type of three-phase medium frequency generator,the gasoline generator spare partsfrequency of three phase generator generator frequency three times Left and right sides,which can wholesalemotor.blogspot.com improve the excitation response speed. Exciting winding is stationary,controlled by the automatic voltage regulator AVR excitation. Rotating rectifier Have high reliability,using the three-phase half wave bridge rectifier and three-phase full-wave bridge rectifier,firmly fixed on the rotor,with the current measurement And fault indicating device.

0.37 kw YC/YC2 capacitors series single phase ac electric motors

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