Dc voltage measurement

This is a current situation,the multimeter dc voltage in the dc power supply voltage,measure the working voltage of peripheral components;Different IC pins of dc voltage value,and compared with the normal,and compression failure,find out the damaged components.When measured at 8 o 'clock to pay attention to the following:(1) the multimeter to want to have enough resistance,at least more than 10 times greater than the resistance of the circuit being measured,so as not to cause greater error of measurement.(2) usually put the potentiometer to the middle position,if it is a TV set,signal source to adopt standard color bar signal generator.(3) to take pens and asynchronous motor or probe anti-skid measures.For any instantaneous short circuit is easy to damage the IC.Can take the following methods to prevent the pens and sliding: take a bike with a valve core set of pen in the table,and the long table pen is about 0.5 mm or so,it can make the table pen well and the point contact under test,and motor run capacitor can effectively prevent the skid,and even meet with neighboring points can not short circuit.


(4) when the measured voltage does not accord with normal,a pin voltage should be based on the pin to IC normal work have important influence as well as the other pin voltage were analyzed,and the corresponding change to ac electric motor judge of IC.(5) IC pin voltage will be affected by peripheral components.As peripheral components occurs leakage,short circuit,open circuit or value,or peripheral circuit connection is a variable resistance value of the potentiometer,the location of the potentiometer arm,will make the change pin voltage.(6) if IC voltage is normal,the pin is thought IC is normal;If abnormal voltage IC part pin,it should maximize deviation from normal,check the peripheral components for XXX,if wholesalemotor.blogspot.com no failure,the IC is likely to be damaged.(7) for dynamic receivers,such as TV,in the presence of signal,IC pin voltage is different.If discover pin voltage should not change but change is big,the size and adjustable with the signal components of different locations and change but do not change,can determine the damage of the IC.(8) for a variety of ways of working device,such as video,work in a different way,each pin voltage IC are also different.

What are the components of transformer overhaul?

(1),hanging out of the body,overhaul,body (core,coil,generator generator set tap- changer and lead);(2),maintenance safety cover,oil storage tank,gas,heat pipe throttle single phase generator and casing;(3),and cooling device and oil filter equipment,(4),filter oil or oil changes,if necessary,dry processing.(5),the access control and measuring instrument,signal and protection device;6,clean up the shell,if necessary,paint;All landowners,assembly and measurement and test.

(1),hanging out of the body,overhaul,body (core,coil,tap-changer and lead);12v mini generator motor (2),maintenance safety cover,oil storage tank,gas,heat pipe throttle and casing;(3),and cooling device and oil filter equipment,(4),filter oil or oil changes,if necessary,dry processing.(5),the access control and measuring instrument,signal and protection device;6,clean up the shell,if necessary,paint;All landowners,assembly and measurement and test. Advantages of wound asynchronous motor can be through the collector ring wholesalemotor.blogspot.com and brush,plus resistor in series with the rotor loop,to improve the starting performance and can adjust speed change and resistance within a certain range.But the wound,more complicated than the squirrel- cage asynchronous motor structure,poor reliability of the movement of the price is more expensive.

Multimeter application technique measure skills

1,the road test diode,transistor,voltage regulator tube is good or bad,because in the actual circuit,bias resistors or diode triode,voltage regulator tube peripheral resistance is compared commonly big,mostly over hundreds of thousands of ohm,in this way,we can use the multimeter R * 10 Ω or R electricalmotor1.blogspot.com 1 Ω shift to measure the p-n junction of the road. In road measurement,measurement in R x 10 Ω gears p-n junction should have a clear direction,features (if the positive and negative to the resistance differs not quite apparent,can convert R x 1 Ω file to test),generally positive resistance at R x 10 Ω file whose hands should be instructed in about 200 Ω,time measurement motor run capacitor in R x 1 Ω file whose hands should be indicated when measuring around 30 Ω (according to different phenotypes may differ ac electric motor slightly). 

Forward resistance is too big or reverse measurement results if the value is too small,suggests that the p-n junction has a problem,the tube also have a problem. This method was especially effective for maintenance,can very quickly find out bad tube,even has not been fully broken can be detected but bad tubes. For example,when you use small resistance profile measurement is a PN junction resistance is ac induction motor too large,if you put it down with the commonly used welding Ω R x 1 k file and test,may be normal,in fact,the characteristics of the tube has gone bad,cannot work normally or unstable.2,measuring resistance: it is important to choose the right range,when the pointer instructions from 1/3 to 2/3 full scale measurement precision is highest,the most accurate. Note that in R x 10 k ohms resistance measured level of resistance values,not to fingers on both ends of the resistance,so that the body resistance will make small measurement results.

Voltage current transformer model meaning

Capacitive voltage transformer (CVT),in 1970 developed the domestic first 330 KVCVT,1980 and 1985,developed fan motor the first generation and second acmotortrading.blogspot.com generation KVCVT 500,1990 and 1995,developed the third and fourth generation KVCVT 500,more than 30 years has accumulated rich 12 volt electric motor experience in scientific research,development,design and production,in the domestic developed generation after generation of CVT new products,three phase induction motor giving impetus to the development of the domestic CVT.CVT's main features are: 1.High electric strength,insulation margin is large,reliable operation.2.Reliable damping ferroresonance.Successful adoption of the new group phase,with strict quality control,ensure that the factory's every piece of CVT are under any of the voltage from low to high effective damping various ferromagnetic resonance frequency.3.Good contact response characteristics.When the second time remaining after a short circuit voltage can fall below 5% in 20 ms,especially adapted to the fast relay protection.4.Has the power grid harmonic monitoring of patent technology.

The operation of the three-phase asynchronous motor monitoring

Three-phase asynchronous motor running monitoring:1,monitoring,motor overheating 2,monitoring the working current of the motor is more than the rated current 3,monitor power supply voltage with or without changes 4,monitor whether the three-phase power supply voltage and current balance Note: in the operation of the three-phase asynchronous motor 1,pay attention to the ventilation of the motor and the environment 2,pay attention to the motor vibration 3,pay attention to the noise of the motor with or without abnormal situation 4,pay attention to whether motor abnormal smells 5,pay attention to the working condition and fever motor bearing Daily monitoring master electrician motor five often:1,often listen to.Motor issue during normal working uniform "buzzing" sound.Particularly heavy when I heard the "buzzing" sound,or "utter the word" sound,motor open phase running.

If heard a continuous "guru" or "giggle" sound,that there is something wrong with the motor bearings 2,often

have a look.See the ammeter or a voltmeter indicates whether or not the normal;See if three phase

current balance;See whether the power supply voltage of three-phase;See Motor

vehicle if motor on the basis of solid,etc.3,often monitoring environment temperature.The output power of the motor temperature has a great relationship with the surrounding environment,the

environment temperature is higher,the smaller the motor output power.When the environment temperature below 35 ℃,motor power output will be greater than the rated power output,the increase of amplitude of (35) % (t for the actual environment temperature),but not more than 8% - 10%;When the environment temperature above 35 ℃,the output power of the motor than rated output power reduction (t - 35) %.4,often feel.Back with your fingers touch the motor shell,temperature rise is too high.As the hot

hand,motor has overheating.5,often smell.Whether with his nose close to the motor,smell the smell of

insulating varnish or anxious burnt flavour.If have,diesel generating set could be the result of a coil of motor overheating and short circuit,etc.

Pole changing logarithmic speed control method

This control method is used to change the connection mode of the stator acmotortrading.blogspot.com winding to change cage motor stator polar logarithmic to achieve speed,features below:With a hard mechanical properties,good stability;No slip loss,high efficiency;Wiring is simple,convenient control,low permanent magnet generators for sale price;Have used differential is bigger,cannot obtain smooth speed regulation;Can be used with regulating speed control,electromagnetic slip clutch,5kw permanent magnet generator smooth speed electric motors pricec haracteristics of high efficiency.This method is suitable for don't need a stepless speed regulation of production machinery,such as metal cutting machine tools,elevators,lifting equipment,fan,water pump,etc.

220V YC single-phase asynchronous electric motors double running capacitors IP44 IP55 IP56 1.2.3.4.5hp high torque

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