The analysis of the causes of leakage of transformer oil - packing quality

At the scene of the collapse of the transformer terminals can be electrical motor found at a time,leakage of oil terminal blocks most of fastening nut loose,install this doesn't mean that it electrical motor 24v did not tighten,with plane flange rubber gasket,for the first time after fastening tend to loose because of plastic deformation of the rubber gasket,need a second fastening.Transformer and our factory has been running for many years,there is no rubber gasket deformation problem,may explain why only is rubber gasket ageing lose elasticity,reducing the pressure on the surface of the flange connection.According to my years of experience in maintenance,air isolation rubber gasket to run more than ten years should not have what problem.Such as the transformer operation of our factory in nanjing,cichang has more than 20 years,did not find for porcelain set gasket electricalmotor1.blogspot.com aging oil leakage.Presumably liling porcelain production of transformer set gasket exist quality problems.

Rated power

Power rating is computer radiation eliminator continue to work to provide maximum power,unit permanent magnet motor in watts (W),or use the kilowatt (KW),for the unit 1 KW = 1000 watts.Computer radiation eliminator is working to replace the computer power cord,so asynchronous motor its rated power must meet the needs of computer,computer radiation eliminator is the most important parameters.Rated power and rated motor run capacitor voltage and working current has a very close relationship,in principle equal to rated voltage multiplied by the working current,so the computer radiation eliminator usually in the rated power of 1000 www.facebook.com/dongfeng.motor w to 2000 w.As well as working current,rated power is in the normal work of continuous can provide maximum power,rather than say work must have need of such power.Computer radiation eliminator power at work actually far less than this value,basically depends on the computer itself need power,the computer radiation eliminator consumes power is very small.

Machine tool equipment electrical troubleshooting - test method with further narrowing the scope of the fault

The appearance inspection found no fault point,can according to the fault phenomenon,combined with the circuit diagram analysis of the cause of the problem,in expanding the scope of the fault,damage under the premise of electrical and mechanical equipment,direct current experiments,or remove electricity load test,in order to distinguish the fault may be in electrical parts and machinery,and other parts;electrical motor Is on the motor and control equipment;Is in the main circuit and control circuit such as contactors and motor movements,the fault in the main circuit;If contact not suck,fault in the control circuit.Usually check control circuit,particular way is:one button only or all kinds of switch operation,circuit in the contactor,relay will take place according to the order of the work.If,in turn,moves to a asynchronous motor certain electrical components,found that do not conform to the requirements,both show that the electrical components or the relevant circuit has a problem.In this circuit,item by item analysis and check again,usually can find fault.

To control circuit troubleshooting back to normal again after turn on the main circuit,check the main circuit of the control effect,to observe the performance of the main www.facebook.com/dongfeng.motor circuit with and without exception,etc.Seven,with measurement method to determine the fault point Measurement method is used to accurately determine the fault point in maintenance electrician work an effective inspection method.Mainly through to the power circuit for electric or related parameters such as voltage,resistance and current measurements,such as to judge the stand or fall of electrical components,equipment insulation situation as well as the on-off of the line.When using the measurement single phase electric motor method of check point of failure,make sure all kinds of measuring tools and instruments in good condition,used correctly,but also pay attention to prevent induction,the influence of loop current and other parallel branch,lest make wrong judgment.

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.

Pump and fan - the other types of pump and fan

 Pump and fan is to use plus can denier permanent magnet motor conveying fluid fluid machinery.They are widely used in gas and heating and ventilation.According to the working principle of pump and fan,usually they can be classified as follows:Such as jet pump,jet pump and vortex pump motor run capacitor (scroll pump),vacuum pump,vacuum pump),etc.This introduction and discussion of pump and fan commonly used refrigeration electricalmotor1.blogspot.com professional theory,performance,operation,adjustment and selection methods of knowledge.Due to refrigeration professional pump commonly used is incompressible fluid as working object.And fan pressurization degree is motor magnet not high,usually only pa 9807 or below 1000 mmh2o),so this content according to the incompressible fluid is discussed.

Distribution of maintenance procedures

 (1) the maintenance single phase electric motor of landing the ark: take out the drawer cabinet,drawer cabinet of automatic air switch,contactor,tighten all of the terminal,contact uneven parts with a flat file file,not spring gasket must be paid to the replacement,check whether the primary loop line ear asynchronous motor contact,end of the line insulation are in good condition,connection-peg presence of the ablation phenomenon,after the dust cleaning,back into the power distribution cabinet,close the air switch,check whether the control parts and instructions normally.(2) the maintenance of PGL ark: after the blackout,first check whether the automatic switch,isolating switch is good,tighten all wiring,contact has ablation parts with a flat file file.Spring washer should be replaced,check whether the main return route ear is well connected firmly.

Terminal insulation is reliable,check whether the zero line insulation layer is damaged,aging,loose contact,test grounding of cabinet put oneself in another's position,sending after cleaning dust,check www.facebook.com/dongfeng.motor the secondary loop.(3) maintenance procedures for capacitance ark: first will play to stop switch capacitance ark,then disconnect the total power switch capacitance ark,with 25 MMZ wires through the resistance by the capacitor to discharge to check and tighten the contactor,reactor,capacitor terminals,terminal control line are in good condition,the grounding device meets the requirements,contact of permanent magnet motor the file ablation and clean the tank components,then closing check discharge lamp and automatic compensation system is normal.All of the above maintenance as a result,should be written in maintenance records.

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.