Excitation contacts between the armature and the core working air gap is too large

Diesel use that often appear overly excited contactor LC action lags, or the master controller handle a blade and electric control contactor operation after only a few field contactor pull, sometimes even exceeding 35 or more, resulting in mistaken crew electrical fault in the process of elimination in the field contactor suddenly pull away car,   mcb circuit breaker crew working to bring some difficulties . Cause : Auxiliary interlock -delay . Excitation contacts between the armature and the core working air gap is too large. Activities are not flexible and exciter armature contactor moving contact and arc chute connected to ground caused by excitation contactor guilty cards. Field contactor auxiliary starting coil  air circuit breaker  or anti- interlock contacts being exposed . Analysis: field contactor switched on only after all the only action , if one is turned slowly interlocking coil is energized will cause lag . Auxiliary contacts connected, breaking contacts by electrically controlled solenoid valve on the air cylinder control contact air source to achieve, it is sometimes due to poor lubrication, air cylinder , electronically controlled contactor guilty card , electronic control contacts on the electrically controlled valve stem wear due to prolonged use too short , thimble or curved top side , so that the compressed air into the pneumatic air cylinder device channel becomes smaller ;

Create mechanical system simulation model of the structure

A solid modeling functions can complete the modeling of a simple structure, but for the mechanical system is relatively complex structures, it is difficult to obtain ideal model. In order to establish a more accurate three-dimensional model, must be combined with other 3D modeling software to build the structure of the mechanical system  mcb circuit breaker . Use modeling software UG, UG software can realize the concept of product design, industrial design, three-dimensional model design, analysis and calculation, dynamic modeling and simulation, engineering drawing output, etc., and has been widely used in aerospace, automotive,  electric transformer , shipbuilding , numerical control (NC) machining, medical devices and electronics and many other fields. Using ANSYS software to the AC electromagnetic contactor dimensional model, using UG software to establish a three-dimensional model bevel gear, but has yet to see software to establish communication with UG three-dimensional model of electromagnetic contactor.

Permanent magnet material properties change will inevitably affect the performance of contactor operation

Magnet contactor by conventional electromagnetic contactor evolved a new contactor, it uses the new works, to overcome the traditional electromagnetic contactor energy consumption, operating noise, by the impact of the grid voltage and large shortcomings. However, the performance of permanent magnetic materials susceptible to temperature effects and changes in material properties of permanent magnet contactor operation will inevitably affect the performance. Traditional  Circuit breaker  contactor development for a long time, the theory and dynamic characteristics of more mature. But now on permanent contact with the dynamic characteristic simulation research literature is relatively small, and did not consider at different  Voltage stabilizer  impact of changes in material properties. Therefore, this paper developed for the laboratory's permanent nominal current 63A contactors, considering different temperature changes in performance permanent magnetic materials, the establishment of the finite element model and the simulation model, at different temperatures Magnet contactor operating characteristic simulation analysis work, get action performance curve.

Contactor main contacts prone to erosion or welding Symptom

In the machine tool equipment electrical maintenance practice, often encounter such a fault , that bear cage type motor forward and reverse control relay - contactor main contacts prone to  air circuit breaker  or welding failure phenomenon . The reason is nothing more than the main circuit or motor load , line occurred phase , overcurrent , overvoltage , overload and short circuit , or main contact capacity is too small , the device intrinsic poor quality, poor performance interrupter contacts , or action too frequent , and other mechanical factors . As a general rule , the causes of such failures are mostly obvious faults are relatively easy to exclude . But for other failure reasons, many maintenance personnel tend to notice , such as the device 's own action delay caused by the failure of its  mcb circuit breaker  device characteristics are mainly caused by differences contacts competitive mistakes, resulting in a system control the disorder causes the main contacts ablation or welding . For brief , it can do a simple closed  electric meter  test . See Figure back below. As we all know , the relay - contactor operation of its contacts off characteristics , always follow such a principle ; namely when the coil is energized regardless of the release will or power of the moment, by its own structural reasons , The control break before make contacts all follow the principles .

Street iron yoke plate between prolapse and changed the working air gap

Main contactor air cylinder and electric control valve leakage that insufficient air pressure, contactors slow movement; also electrically controlled contactor air cylinder and poor  Voltage stabilizer . Li ti excitation contactor iron working air gap between the core is too large: one is the field contactor coil and yoke gasket between the core mounting bolts loose or loose; second is the street between the iron yoke plate  mcb circuit breaker  and changed the working air gap. Activities are not flexible and exciter armature contactor moving contact arc hood connected with day wear caused by excitation contactor guilty cards. Analysis from the field  power transformers  part of the circuit can be seen only switched on only after all the action, if the three of them turned slowly interlocking coil is energized will cause lag.

Normal operation as the main power switch on the AC contactor

In use there, the normal closing operation as a total power 4OA AC contactor, and then operate a motor closing any other AC contactor, the total supply of both the control Bo OA AC contactor is disconnected. Disconnect motor circuit without load at startup, this  mcb circuit breaker  still exists. Therefore array analysis in machine electric stick into the line terminals, check with voltage tester has power display, with three-phase AC voltage meter to check the line voltage, phase voltage are in line  air circuit breaker . AC contactor without 4OA as the main power control, respectively, with AC contactor control 4 motors can work, but at the same time start two or more motors, the AC  electric transformer  on the trip. And starting with the direct method, you can also start the four electric motors. Find the above analysis, the total power and time lines identified no problems, the fault should be out in the second line.

Commonly used mobile substation high voltage isolation, low feed control mode

With the development of mining automation technology for coal mine power system reliability, security and continuity of the increasingly high demand . However, the original use of coal mine mobile substation high and low side switches with many problems . First of all, high and low voltage flameproof existing domestic leakage  mcb circuit breaker  malfunction different levels prevailing situation , not only caused a lot of unnecessary face power outage , but also to find the point of failure workers bring great trouble , serious affected production . Secondly, the original use of domestic coal mine with a commonly used mobile substation high voltage isolation , low feed control mode. High pressure switch is load switch , not breaking fault current ; low pressure side of the vacuum feed switch , breaking current is large . As well as to the low voltage winding transformer  Voltage stabilizer  failure can not be breaking the dead zone . Again, most do not have an existing switch network communication function , the workers only for high-voltage switch for close viewing and operation. To solve the above problems, the design and development project based on PLC control intelligent protection  electric meter  substation with high and low side switches. High voltage distribution switchgear with vacuum circuit breakers, low-voltage side of the feeder switch is not installed electrical protection box . High voltage distribution switch with overload, short circuit, phase , overvoltage , undervoltage, overtemperature protection function

High-voltage electrical equipment electrical porcelain importance and performance in the earthquake

Porcelain columnar sulfur hexafluoride circuit breaker for the study, carried out shaking table test and finite element analysis , the establishment of an effective system of electrical porcelain electrical equipment ( including shock absorbers, wire ) finite element model and the corresponding computational analysis method to study the seismic performance of high voltage electrical equipment and conductors for electrical equipment shock absorbers and seismic performance.  air circuit breaker  and obtained findings : porcelain -type high voltage electrical equipment and its importance in the earthquake performance. Damage data indicate that the high-voltage electrical equipment electrical porcelain damage is caused by high voltage grid system to destroy the key point, and the destruction of such  mcb circuit breaker  due to equipment damage caused by brittle ceramic column section . Accordingly, the seismic performance of such equipment in the past  Voltage stabilizer  on research ceramic column . According porcelain high-voltage electrical equipment as well as the structural features of the device at run-time state shows that the factors that affect the seismic performance of the device include: ceramic column , the connection between the ceramic column flange, equipment support , shock absorption and isolation device equipment , the wires between devices . This departure from these factors , summarizes the current research on these factors and problems , and identifies research content .

Maintenance of high voltage electrical switch gradually find methods and means stability

High-voltage electrical switch in the power system as a whole, an important part of our country safe and stable operation of power systems play an important and decisive role, but also directly affect the electrical safety of users. In order to maintain the stability of  mcb circuit breaker , people also began to attach importance to the stability of high-voltage electrical switch problem. Therefore, the power system workers also began by analyzing the stability of high-voltage electrical switchgear factors to gradually find maintaining the stability of high-voltage electrical  power transformers  and methods. Stability of high-voltage electrical switch basic status of high-voltage electrical switch of the power system as an important part, with the use of a wide range and number of features, its electric meter can give the entire power system operation caused by the security and stability the most direct impact of the development of high-voltage electrical switch China's electric power system operation and quality are closely related.

Electrical properties, oxidation resistance is poor, but good antioxidant susceptibility

Transformer oil to replace the electrical switch oil , which can not meet the required electrical switch oil insulating properties and low temperature properties .  electri cenergy meter  equipment is running , the occurrence of short-circuit current , oil often produce large amounts of free carbon , oil blackened , dielectric strength would drop dramatically ; short-circuit breaking generally occurs twice , it is necessary to stop oil treatment equipment , and thus had to frequently change oil , increasing fuel consumption . Dushanzi oil refinery production breaker  mcb circuit breaker , in particular the rare , far from meeting market demand. French import breaker better quality oil , but the variation in viscosity , slow settling of free carbon , colloid state easily , difficult to remove . Cycloalkane has good electrical properties, poor oxidation resistance , but the susceptibility of good antioxidants , and generally low pour point is an ideal  Voltage stabilizer  the insulating oil . So are the first choice of the world production of crude oil naphthenic insulating oil . Because less naphthenic crude oil reserves , so it developed from the middle of the base , even from the paraffin-based oil producing electrical switches . To meet the high-voltage electrical switch oil oil needs , we hydrogenated oils, benzene as raw material, developed in line with specifications SH/T0205-92 electrical switch oil, which are high-grade lubricants .

High voltage switching device is a transmission and distribution systems from the control and protection of the most important electrical equipment

National Grid to increase investment by the market economy, many factories have launched production of switching equipment. Where high pressure, high-voltage switchgear is transmission and distribution systems from the control and protection of the most important electrical equipment, is supported by the state major machinery and  mcb circuit breaker , revitalize national industry shoulder the historic mission. West Electric Group, Xi'an Switch Factory million volt level product assembly project for the steel construction. The project has outstanding characteristics, concentrated light steel, heavy steel lattice, grid, color plate roofing,  electric transformer , etc., due to process causes more building partitions, design and construction of complex, changing shape. Project Overview West Electric Group Western Cape million volt level product assembly project, with a total construction area of ​​20000m2, due to the production process is divided into eight  power transformers  segmentation, the main plant with a steel form. Buildings highest elevation 41m, maximum span of 60m. The main structure in the form of steel plants, including H light steel, lattice steel columns, grid and so on.

Flameproof enclosure by a lever on the brass sleeve requires co-ordinated with copper sleeve

Button ring groove on the rod-proof products, many manufacturers now shell and front cover has a variety of button, the button bar is often used form of ring, ring effect is that once the explosion occurred inside the enclosure, the pressure acting on the button bar ends, the ring can be introduced to prevent the button rod outer shell, thus avoiding the formation of the button bar missing booster channels. It  electric meter , taken from a mechanical manual investigation groove depth is small, if roots unclear bottom pressure in the circular ring will follow the axial sliding movement relative to the button bar, the loss of a ring effect.  power transformers , the design of the groove depth should be appropriate bigger, processing bottom should pay attention to clean the root, or simply use the pin structure is more reliable. About flameproof enclosure by a lever on the brass  Voltage stabilizer  co-ordinated with copper sleeve, copper sleeve is an interference fit with the housing, and the joystick is clearance fit. Copper sets the amount of interference should not be too large, should be controlled not more than 0.05mm, copper sleeve wall thickness should not be less than 2.5mm.

Electrical Design violate or deviate from the design specification With the popularity of various household appliances

Electrical construction electrical design basis is the most important documents, the main factors affecting the quality of the project are : the design file is executed in strict accordance with state regulations, the depth of the design and construction documents relevant professional close coordination between the degree . Therefore, the electrical design of the whole project a top priority. Decline in quality design is particularly serious in recent years . There may be multiple reasons , such as the design of the vicious competition, lower prices between companies , making the design units to reduce inputs in order to reduce costs and so on. However,  air circuit breaker  , as long as the design unit attached importance recurrent organizational design personnel to learn the relevant design standards and strengthening the design process of supervision , emphasis on document review , you can basically solve such problems , but such small changes it can make project supervision and  Circuit breaker  will benefit. Electrical Design violate or deviate from the design specification With the popularity of  electri cenergy meter  appliances , low-voltage power high harmonic pollution is increasing , three times its odd harmonic multiples constitute neutral current , neutral overcurrent and thus lead to electrical fire phenomenon is also increasing . Another example is in the process of supervisory review found that the current figure is still part of the distribution area residents building design is still used in the 1980s has been introduced methods, equipment is very backward , technical means to keep up with the times, and prone to danger.