He who knows others is wise, and he who knows himself is wise. Most of us think we know enough about ourselves, but many wrong life choices happen when we don't know ourselves clearly. The purpose of self-evaluation is to examine one's own value through introspection of past growth experiences. How do you write your self-evaluation? I present two articles on how to write a good self-evaluation of technicians for your reference!
How to write technician self-evaluation: maintenance electrician self-evaluation
Time flies, the three-month probation period in xx company is coming to an end. Looking back on this short but rich internship life, I was nervous and novel, and gained a lot. The following is a brief summary of my internship life. First of all, in terms of ideological and organizational discipline, I will abide by the regulations of the internship unit, not be late, not leave early, not absent from work, not taking sick leave, actively participate in cleaning, saving water and electricity, caring for public property, being polite, modest and prudent, respecting leaders and colleagues, being United and friendly, and getting along well with colleagues. Secondly, in terms of working attitude, I am hard-working, conscientious, hard-working, obeying and cooperating with the arrangement of the monitor in charge, accepting the criticism and suggestions of the conductor and other colleagues with an open mind, trying to do my job well, being rigorous, diligent and eager to learn, and completing the tasks assigned by the monitor. In terms of practical ability, I have gained the most, and the greatest satisfaction is that I have learned the equipment that the company has never touched before, which makes me know more about the knowledge and the truth of doing things outside the driving equipment and textbooks. In practice, I can combine theory with practice, and by solving the problems encountered in practice, I have increased my ability to look at and solve things, and also learned a lot of things that I have not learned before.
In my life, I know many colleagues who work together and get along well with them. You can learn from each other and help each other in your studies, and you can also gain a lot in your life. I am very grateful to Haichang Company for giving me this rare internship opportunity and work, and I am also very grateful to the leaders and the captain Zhou for their trust and concern. I also cherish this opportunity. During the three-month trial, I learned a lot. This trial in xx has brought me some knowledge that the company has not been exposed to before, which is of great help to our future work and life, as well as the following electrical maintenance work. More importantly, I learned a serious and scientific attitude in this electrician internship. Through this electrician practice, I have a deeper rational understanding of Siemens electrical control system, frequency converter, ship loader, bucket wheel machine and electrician technology, and have a further understanding of electrician technology and other professional knowledge. At the same time, through practice, we can acquire practical knowledge of electrical technology such as production and installation skills, cultivate the ability to integrate theory with practice, improve the ability to analyze and solve problems, enhance the ability to work independently, and cultivate the spirit of unity and cooperation, * * common discussion and * * common progress among colleagues. After more than three months of trial, I have a deeper understanding of the importance of practice. Through practice, I realized the truth of this sentence. If there are problems, there will be gains and improvements. There is a great difference between theory and practice. Many things need us to think for ourselves. Only when you give will you get it. If you think, you will gain, that is to say, if you improve, you will enhance your practical ability and thinking ability.
I think electricians should deal with equipment problems at the first time to meet the production requirements. Collect problems in order to improve in time and better maintain and meet the requirements of future production and use. Skilled in professional skills, diligent in on-site observation, independent thinking, more communication with colleagues, and strive to continuously improve their level. Every maintenance of the vehicle means a better understanding of the company's driving equipment, which can promote the improvement of working technology. During the three-month trial, I learned a lot, not only to study, but also to be a man, which benefited me a lot. This is very beneficial to my future work.
Besides, I also learned how to better communicate with others, how to better state my views, and how to convince others to agree with me. I believe these valuable experiences will be the most important cornerstone of my future success. Trial is a necessary experience for everyone to enter the factory. It let me know the company's equipment operation, work content, rules and regulations and society in practice, and let us learn a lot of knowledge that we can't learn at school and in the company. It also broadened our horizons and increased our knowledge, laying a solid foundation for me to better serve Haichang in the future. In the information age, basic hands-on ability is the foundation and necessary condition of all work and creation. Only by constantly increasing one's ability and having rich knowledge can one not be eliminated in the future competition. Good skills and judgment are needed to make the work go smoothly. I was deeply touched by this internship. In the future study and work process, we should try our best to integrate theory with practice, pay attention to training our hands-on ability, and let ourselves have certain confidence and confidence in our future work.
Chapter 2: Self-evaluation of maintenance electrician.
In my years of equipment maintenance, I noticed that many faults were caused by the aging of various low-voltage electrical appliances during menstruation and the lack of regular maintenance. The following illustrates the troubleshooting and essentials of low-voltage electrical appliances through some examples in my maintenance work.
A few examples of troubleshooting common voltage appliances
1, voltage circuit breaker failure
Contact overheating, can smell the smell of power distribution control cabinet. After inspection, the moving contact is not completely inserted into the static contact, and the contact pressure is not enough, which leads to the decrease of switch capacity and overheating of the contact. At this time, the operating mechanism should be adjusted so that the moving contact is completely inserted into the static contact. When electrified, flashover and explosion occur due to long-term overload and poor contact. When repairing this fault, we must pay attention to safety to prevent electric arc from harming people and equipment. After the load and contacts are overhauled and the no-load power supply is normal, the operation can be checked with load until it is normal. This kind of fault must pay attention to the daily maintenance of the equipment to avoid unnecessary harm.
2, contactor failure
Out-of-phase contact, poor contact of a certain phase or loose terminal screws lead to out-of-phase operation of the motor. At this time, the motor can rotate but hum. Stop the car immediately for maintenance. Contact welding, connect the "stop" button, the motor will not stop rotating, and it may hum. This kind of fault is that the two-phase or three-phase contact can be removed due to overload, and the coil is rewound according to the original data, and then dipped in paint to dry.
3, thermal relay failure
The mechanical equivalent of the heating element is burnt out. If the motor can't start or there is buzzing when it starts, it may be that the fuse in the thermal element of the thermal relay is blown. The reason for this failure is that the operating frequency of thermal relay is too high or the negative side is overloaded. After troubleshooting, replace the appropriate thermal relay, and readjust the set value after attention. Thermal relay "misoperation". There are several reasons for this failure: the setting value is too small, so that there is no overload when acting; The starting time of the motor is too long, which makes the thermal relay act during the starting process; The operating frequency is too high, so that the thermal elements are often impacted. Re-adjust the set value or replace the appropriate thermal relay to solve the problem. The thermal relay does not operate. This kind of fault is usually that the current setting value is so large that it does not act for a long time after overload. The set current should be adjusted according to the working current of the load. Thermal relay has been used for a long time, so its operation reliability should be checked regularly. When the thermal relay trips, it should be reset after bimetal cooling. Do not press the reset button too hard, otherwise it will damage the operating mechanism.
Second, the troubleshooting of common voltage appliances and its essentials Each voltage appliance with contact action is mainly composed of three parts: contact system, electromagnetic system and orphan extinguishing device. It is also the focus of maintenance.
1, contact for troubleshooting.
Contact failure generally includes contact overheating, fusion welding, etc. The main causes of contact overheating are insufficient contact pressure, oxidized or unclean surface and insufficient capacity. The main reason of contact fusion welding is that when the contact is closed, a large arc is generated, and the contact jumps seriously. Check the contact surface for oxidation and dirt. There is dirt on the contact, which has been cleaned with gasoline. The oxide layer of silver contact not only has good conductivity, but also will be reduced to metallic silver in use, so it cannot be repaired.
If there is an oxide layer on the copper contact, you can file it with a smooth file or scrape off the oxide layer on its surface with a knife. Observe whether there is burn or singeing on the contact surface. The singeing of copper contacts can be trimmed with a smooth file or knife. The repaired contact surface does not need to be too smooth, and it is not allowed to be repaired with abrasive cloth, so as to avoid the residual sand grains embedded in the contact when the contact is closed, causing poor contact. But the silver contact singeing does not need to be repaired. If the contact is welded, the contact should be replaced. If it is caused by insufficient contact capacity, an electrical appliance with larger capacity should be selected for replacement.
Check whether the contact is loose. If it is loose, tighten it to prevent the contact from jumping off. Check whether there is any mechanical damage on the contact to deform the spring, resulting in insufficient contact pressure. If so, the pressure should be adjusted to make the contacts contact well. The empirical measurement method of contact pressure is as follows: to measure the initial pressure, put a piece of paper between the bracket and the moving contact, which is about 0. 1mm wider than the contact, and the paper is pressed by the spring. At this time, pull the paper with one hand. When the paper can be pulled out and feels strong, it can be considered that the initial pressure is more appropriate. When measuring the final pressure, the paper is sandwiched between the moving and static contacts. When the contacts are electrified and attracted, the same square ruler is used. When the paper can be pulled out, the final pressure can be considered as appropriate. For large-capacity electrical appliances, such as 100a, when the same square farad paper strip is used, it can be considered that the initial and final pressure when the paper strip is pulled out is more suitable. The above-mentioned contact pressure measurement method has achieved good results in many repair tests. Can be carried out normally. If the measured pressure value cannot be recovered by adjusting the spring, the spring or contact must be replaced.
2. Troubleshooting of electromagnetic system Due to poor contact between the end faces of the moving and static iron cores, the iron core is skewed, the short-circuit ring is damaged, the voltage is low, the armature will make noise, and even the coil will be overheated or burned.
(1) The armature is noisy. When repairing, remove the coil and check whether the contact surface between stator core and stator core is smooth and free of oil pollution. If it is uneven, it should be filed or smoothed; If there is oil stain, clean it with gasoline. If the moving iron core is skewed or loose, it should be corrected or tightened. Check whether the short-circuit ring is broken. If the short-circuit ring is broken, the copper plate should be replaced according to the original size, or the thick copper wire should be made into a square section and installed according to the original size.
(2) After the electromagnetic coil is cut off, the armature is not released immediately. The main reasons for this failure are: the moving part is stuck; The air gap of iron core is large and the remanence is too large; Spring fatigue deformation, lack of elasticity, oil pollution on the contact surface of iron core. After disassembly and renovation, an air gap of 0.02-0.03 mm can be left between the end face and the bottom end face of the iron core, and the spring can also be replaced.
(3) Troubleshooting of the coil. The main fault of the coil is that the current passing through it is too large and the coil is overheated and burned. This kind of fault is usually due to the damaged insulation of the coil, low power supply voltage and poor contact between the moving and static cores, which will also make the coil current too large and the coil overheat and burn out. If the coil is burned due to short circuit, it should be rewound. The diameter and number of turns of the wire can be measured from the burnt coil. You can also find out from the nameplate or manual that if the coil is short-circuited at 3℃, the number of turns of the coil in the oven is not much. The short circuit point is close to the coil head, and the rest are in good condition. Cut off the power supply immediately to avoid burning the coil. If there is no vibration and mechanical noise after the coil is electrified, check whether the lead connection of the coil falls off, and check whether the coil is broken or burned with a multimeter; If there is vibration and noise after power-on, check whether the moving parts are stuck, whether there is a conductor between the static and moving cores, and whether the power supply voltage is too low. We should treat them differently and deal with them in time.
3. Maintenance of fire extinguishing device
Remove the arc extinguishing cover, check the integrity of the arc extinguishing blade, and remove the smoke marks and metal chips on the surface. The shell should be intact. If there is a crack in the arc extinguishing cover, it should be replaced in time. In particular, it is pointed out that the original electrical appliances with arc extinguishing cover should not be used to prevent short circuit without arc extinguishing cover. There are many kinds of commonly used low-voltage appliances. The above are some typical and commonly used methods and essentials for handling electrical faults, which are similar, and have certain characteristics for the maintenance of other electrical appliances, but they are very practical. This is a summary of maintenance technology I have worked for many years for your reference. Since my work, under the careful training and guidance of the unit leaders and through my own continuous efforts, I have made great progress and gained a lot, both ideologically, academically and at work. Self-evaluation of the present work is as follows: ideologically, actively participate in political study, adhere to the four cardinal principles, support the party's principles and policies, and consciously abide by various laws and regulations.
I have always believed the saying, "No matter how bright a match is, it is only as bright as a bean." . But if you light a pile of matches with a match, it will burn very brightly. "I hope to use my brilliant youth to ignite the passion of everyone around me and inspire my colleagues to contribute, forge ahead, make contributions and create a career together. I have been engaged in first-line electrician work since I started working. Over the years, I have been strict with myself and conscientious. Mainly summarized from the following aspects:
In ideological and political study and democratic management, we should conscientiously study Marxism-Leninism, Mao Zedong Thought and Deng Xiaoping Theory, and use Theory of Three Represents to guide production practice. Actively participate in various democratic activities, participate in democratic management, take the factory as the home, work hard, and do a good job in producing first-line electricians.
Second, safety in production
1, carry out the spirit of the superior documents, improve employees' awareness of safe electricity use and enhance their sense of responsibility.
2. Implement and improve the organization system of safe electricity consumption, and improve the safety management rules and regulations.
3. Strengthen the safety management of power consumption of teams and groups, and lay a solid foundation for safety.
4, a guarantee, users should ensure their own safety and the safety of others.
Three. Training and learning For many years, I have actively participated in various kinds of learning and training, and strived to learn basic knowledge and training of electricians, knowledge of power supply system, operation and maintenance of line devices, lighting devices, grounding devices, transformers, motor repair and maintenance, electrical control circuit of machine tools, plc control and other related knowledge systems. Every time I study, I learn some new theories, and apply them to guiding work practice and work, and improve the power supply system and control system of the factory, which has won unanimous praise.
Fourthly, in the aspect of energy saving and consumption reduction, we actively use what we have learned and make a lot of contributions to the energy saving and consumption reduction of the factory. For example, in the aspect of line transformation, it saves more than 10 million kwh of electricity for the factory every year. At the same time, the old equipment in the factory was reformed electrically, which made some old equipment rejuvenated.
Verb (abbreviation of verb) actually produces in production practice, such as the example of finding and eliminating electrical faults of motors. Electrical aspects:
1, check whether the insulation of outgoing wires is intact, whether the motor is overheated, whether the wiring meets the requirements of nameplate, and whether the winding and head and tail are correct;
2. Measure the insulation resistance and DC resistance to see if the insulation is damaged. Whether the winding is open, short-circuited and grounded;
3. Power-on inspection When problems are found after the above inspection, you can directly power-on the test, start to apply a lower voltage with the three-phase voltage regulator, and then gradually rise to the rated voltage. Using the above inspection methods, we can find faults and repair many motors in the factory. Summarize all kinds of fault phenomena and solutions in time, and record them, guide practice and improve your professional level.
In short, in production practice, we should adhere to and strictly follow the rules and regulations. Over the years, there has not been a life safety accident caused by electricity in the factory. After many technical transformations, the equipment operation is more scientific and reasonable.
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