What are the pre-job training steps for new employees? A: Before new employees can work independently, they must go through three training stages: ready-made basic system learning, follow-up learning and trial induction learning, and each stage needs to make a training plan and carry out training as planned. 202, what is the basic content of newly hired production personnel training? Answer: New production personnel employed according to relevant regulations must be educated in the factory (bureau) after entering the factory (bureau). The content is: 1) political thought and fine tradition, factory (bureau) history and discipline education. 2) Professional ethics education in electric power industry. 3) Law-abiding and civilized etiquette education. 4) Education of relevant laws and regulations and knowledge of production safety. 203. What training work is the team trainer responsible for? Answer: The team trainer is specifically responsible for the training work: 1) Formulate the team training plan, implement it at the address under the leadership of the squad leader, and strive to complete various training tasks assigned by the branch (workshop) and the work area (county bureau). 2) Organize team members to learn the technical specifications of the equipment under their jurisdiction and be familiar with the equipment situation and rules and regulations. 3) Carry out team training activities based on team members and combined with team characteristics. 4) Assist the monitor in daily shift training, such as on-site examination, safety knowledge quiz, technical explanation, technical quiz, accident prediction, etc. 5) Assist the monitor to arrange on-the-job training for new employees, supervise and inspect the implementation of the mentoring agreement, and do a good job in the assessment and sampling of new employees. 6) Do a good job in the registration management of various trainings in time and summarize them on schedule, and report the implementation to the training engineers (members) in the breakout (workshop) and work area (county bureau). 204, anti-accident exercises should focus on what content? A: 1) The accident lessons and abnormal situations of this enterprise and other enterprises; 2) Main defects and weak links in the equipment; 3) Possible accidents before and after the new equipment is put into use, and seasonal accidents that affect the safe operation of the equipment; 4) Weak links of special operation mode and operation technology; 5) Major and complicated operation of equipment system. 205, power safety production management system mainly includes what content? A: According to Article 19 of the Electricity Law, electric power enterprises should strengthen the management of production safety and establish and improve the responsibility system for production safety, including the following systems: 1) the responsibility system for production safety; 2) production duty system; 3) Operation ticket system; 4) Work permit system; 5) operating the monitoring system; 6) Work interruption, transfer and termination system; 7) Safety education system; 8) Regular inspection and maintenance system of power facilities. 206, what is the main content of the electricity law? A: There are 70 articles in chapter 10 in the Electricity Law. The main contents are as follows: The Ministry of Posts and Telecommunications has determined the legislative purpose, scope of application, basic principles for developing the electric power industry and the electric power management system. Sub-provisions include power construction, power production and power grid management, power supply and use, electricity price and cable, rural power construction and rural power consumption, power facilities protection and supervision and inspection, legal responsibility, etc. Comprehensively standardized the construction and development of the electric power industry. The supplementary provisions stipulate the implementation time of the electricity law, namely 1 April 19961day. 207, what is the basic principle of power grid operation management? Answer: 1) Power grid operation is unified dispatching and hierarchical management. 2) No unit or individual may illegally interfere with power grid supervision. 208. What are the basic principles of electricity law? A: 1) The principle that the electric power industry should develop ahead of time according to the needs of national economic and social development; (2) The State encourages domestic and foreign economic organizations and individuals to invest in the development of power sources and set up power production enterprises according to law, and the principle that whoever invests will benefit will be implemented. (3) The principle that power facilities and electric energy are protected by the state. 4) The principle that electric power construction and production should protect the environment and prevent public hazards according to law. 5) The State encourages and supports the principle of using renewable energy and clean energy to generate electricity. (six) electric power enterprises operate independently according to law, be responsible for their own profits and losses, and accept supervision. (7) The principle that the state helps and supports the development of electric power in minority areas, remote areas and poverty-stricken areas. (8) The principle that the State encourages the use of advanced technology and management methods to develop the electric power industry. 209, what is the over-current protection delay characteristics? Answer: The relation curve between the short-circuit current flowing through the protection device and the action time is called the delay characteristic of the protection device, and the delay characteristic can be divided into fixed time delay characteristic and inverse time delay characteristic. The action time of fixed delay is fixed, which has nothing to do with the short-circuit current. Inverse time delay action time is related to the size of short-circuit current, which is large, short, small and long. There is a certain curve relationship between short-circuit current and action time limit. 2 10, what is the function of relay protection device? Answer: The relay protection device can reflect the fault and abnormal working state of electrical equipment, and automatically, quickly and selectively act on the circuit breaker to cut off the faulty equipment from the system, so as to ensure that the fault-free equipment continues to operate normally, limit accidents to a minimum, improve the reliability of system operation, and ensure safe and continuous power supply to users to the maximum extent. 2 1 1. What are the "5-8", "6-7" and "2-4" contacts on the operating handle of general circuit breakers? When will they have an operation to turn over? When do you disconnect? Answer: "5-8" is the closing contact, which is turned on at the "closing" position and turned off at the "closing" position; "6-7" is a trip contact, which is connected in the "trip" position and disconnected in the "after trip" position; "2-4" is the reclosing discharge contact, which is opened in the position of "ready to trip" and "after tripping" and closed in the position of "ready to close". 2 12, what are the characteristics of battery plate bending in operation? A: 1) plate bending; 2) plate crack; 3) The lead hairs on the cathode plate swell to form mossy tumors. 2 13. What are the characteristics of short circuit of battery plates in operation? Answer: 1) When charging or discharging, the voltage is relatively low (sometimes zero); 2) The specific gravity of electrolyte cannot be increased during charging; 3) There are few bubbles when charging, and the bubbles appear late. 2 14, what causes the transformer to be short of oil? Answer: 1) Long-term oil leakage or a large number of loopholes in the transformer; 2) When repairing the transformer, the oil is not replenished in time after draining; 3) The capacity of the oil storage tank is small, which cannot meet the operation requirements. 4) The temperature is too low, and the oil storage tank is insufficient. 2 15. What are the characteristics of plate vulcanization in battery operation? Answer: 1) bubbles appear prematurely when charging or at the initial stage of charging; 2) When charging, the voltage is too high, and when discharging, the voltage drops below the normal value; 3) The positive plate is brown with white spots. 2 16, what are the characteristics of grounding distance protection? Answer: 1) can protect all kinds of grounding faults, and only one distance relay is needed, so the wiring is simple; 2) Larger grounding transition resistance can be allowed; 3) The protection has fast action speed and good action characteristics; 4) It is less affected by the change of system operation mode. 2 17, what is automatic reclosing? Answer: When the circuit breaker trips, the device that can quickly make the circuit breaker automatically close first without manual operation is called automatic reclosing. 2 18, what is the acceleration after reclosing? Answer: When the protected line fails, the protection device selectively cuts off the failed line and recloses it once. If it overlaps with a permanent fault, the protection device immediately opens the circuit breaker again, with no time limit and no choice. This protection device is called acceleration after reclosing, which can generally be realized by adding an intermediate relay. 2 19, why do you need the relay protection device to act quickly? Answer: The rapid action of the protection device can quickly eliminate the fault, prevent the accident from expanding, prevent the equipment from being more seriously damaged, and also reduce the working time and power outage time of trouble-free users under low voltage, thus speeding up the process of restoring normal operation. 220, what are the basic requirements for relay protection? Answer: According to the task of power system relay protection device, relay protection device must meet the following four basic requirements: selectivity, rapidity, sensitivity and reliability. 22 1. Can the transformer in operation be judged by its sound? Answer: The transformer can judge the operation according to the operation sound. Put one end of the stick on the oil tank of the transformer, and the carbonyl group at the other end will listen to the sound carefully in the ear. If the continuous buzzing is heavier than usual, check the voltage and oil temperature. If there is no abnormality, the iron core is mostly loose. When you hear the squeak, check whether the surface of the casing is flashover. Hearing the crackling sound is the phenomenon of internal insulation breakdown. 222. What should I pay attention to when replacing the hygroscopic agent in the transformer respirator? Answer: 1) heavy gas protection should be switched to signal; 2) When the respirator is removed, the connecting pipe should be blocked to prevent air from being sucked back; 3) After changing into a dry hygroscopic agent, ensure that the oil in the oil seal will not pass through the exhalation nozzle to seal the respirator. 223, transformer on-load voltage regulating device action failure is what reason? Answer: 1) The working power supply voltage disappears or is too low; 2) The motor winding is broken and the starting motor loses voltage; 3) Poor contact of interlocking contacts; 4) The rotating mechanism trips and the pin falls off. 224, on-load tap-changer tap-changer fault is caused by what reason? Answer: 1) The transition resistance in the auxiliary contact breaks down and burns out during switching; 2) The tap-changer is not tightly sealed, resulting in interphase short circuit due to water inflow; 3) Because the contact roller is stuck, the tap-changer stops at the transition position, resulting in short circuit burning between turns; 4) The tap-changer oil tank is short of oil; 5) Cross fault current is encountered during voltage regulation. 225, the change of transformer oil level is related to what factors? Answer: In general, the oil level of transformer changes with the change of oil temperature, because the change of oil temperature directly affects the volume of transformer oil, which makes the oil level in the oil standard rise or fall. The factors that affect the change of oil temperature include the change of load, the change of ambient temperature, internal fault and the operation of cooling device. 226, frequency division resonance overvoltage what's the danger? A: Frequency division resonance is very harmful to the system. Under the action of frequency-divided resonant voltage and power frequency voltage, the magnetic density of PT core is rapidly saturated, and the excitation current is rapidly increased, which will seriously overheat and damage the PT winding (all PTs in the same system are threatened), and even cause bus failure and large-scale power outage. 227, what is a compound rectifier? How many kinds of compound rectifiers are commonly used? Answer: The compound rectifier is composed of a regulated power supply (voltage source) connected to the voltage system and a rectified power supply (current source) connected to the current system in series and parallel, which can ensure the reliable and reasonable control of the power supply when the primary system runs in various modes and fails. There are two kinds of commonly used compound rectification: single-phase and three-phase Single-phase compound rectifier is divided into parallel connection and series connection. 228, substation all kinds of watt-hour meter should be equipped with what level of current transformer? Answer: The active watt-hour meter should be equipped with a current transformer, and the configuration level is 1.0 or 2.0; The reactive power meter should be equipped with a 2.0 or 0.0 current transformer; Transformers, station transformers, line watt-hour meters and other watt-hour meters used to calculate electricity charges shall be equipped with current transformers with the accuracy grade of 0.5 or 1.0. 229, what are the measures to improve the static stability of power system? Answer: 1) Reduce the inductive reactance of each component of the system; 2) Adopt automatic adjusting excitation device; 3) adopt frequency load shedding device; 4) Increase the reserve capacity of active power and reactive power in power system.

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