Answer: The long-distance transmission of electric energy is generally three-phase sinusoidal alternating current, and the transmission power can be calculated by P=√3UI. It can be seen from the formula that if the transmitted power is constant, the higher the voltage, the smaller the current, so that the conductor with smaller cross section can be selected to save non-ferrous metals. In the process of power transmission, the current passing through the conductor will produce certain power loss and voltage drop. If the current decreases, the power loss and voltage drop will also decrease with the decrease of the current. Therefore, after increasing the transmission voltage, selecting the appropriate conductor can not only improve the transmission power, but also reduce the power loss in the line and improve the voltage quality.
2. What caused the fault of transformer on-load voltage regulating device?
Answer: The reasons for the failure of the on-load voltage regulator are as follows: a. The working power supply voltage disappears or is too low; B, motor winding broken wire burned, starting motor voltage loss; C, interlock contact poor contact; D, transmission mechanism tripping, pin fall off.
3. What is the reason for the magnetic resonance overvoltage of pig iron in power system?
Answer: The reason of ferroresonance overdischarge is nonlinear excitation caused by saturation of magnetic circuit of ferromagnetic components. When the voltage transformer installed in the system has poor volt-ampere characteristics, the system voltage rises, and the excitation current passing through the core of the voltage transformer exceeds the rated excitation current, which makes the core saturated and the inductance nonlinear, and can be excited into ferromagnetic resonance overvoltage after forming an oscillation circuit with the capacitor in the system.
4, please describe the advantages of metal oxide arrester protection performance?
Answer: Compared with the magnetic blow arresters of general valves FZ and FCZ, metal oxide arresters have the following advantages:
A, oxide arrester has no series gap, fast action, flat volt-ampere characteristics, low residual voltage and no clipping.
B, metal oxide valve plate allows large flow, small volume, small mass and simple structure.
Minimum afterflow.
D, the volt-ampere characteristics are symmetrical, and the overvoltage protection levels of positive polarity and negative polarity are the same.
5. What is the dielectric loss of insulation? What is the significance of measuring dielectric loss?
Answer: The insulation of electrical equipment is mostly capacitive impedance under the action of AC voltage, but it is not purely capacitive. Its active power loss is collectively called dielectric loss of insulation. Active power loss increases obviously after insulation is wetted, so most electrical equipment can check whether insulation is wetted by detecting dielectric loss.
6. What is the function of measuring insulation resistance?
Answer: Measuring the insulation resistance of electrical equipment is the simplest auxiliary method to check its insulation status. From the measured insulation resistance, it can be found that the conductive part of electrical equipment affects the insulation, the insulation part or all is wet and dirty, the insulation oil is seriously deteriorated, the insulation is broken down and seriously thermally aged.
7. What is surface discharge? What are the factors that affect the surface discharge voltage?
Answer: In the actual insulation structure, there is often gas or liquid dielectric around the solid dielectric, such as air around the line insulator and transformer oil around the solid insulation of the oil-immersed transformer. In this case, the release usually occurs at the interface between two dielectrics. This kind of discharge is called surface discharge.
The main factors affecting the surface discharge voltage are: a, the uniformity of electric field. B, the difference degree of dielectric coefficient on the surface of the medium. C. is it raining? D. degree of pollution.
8. What are the theoretical line losses in the power loss of power grid?
Answer: 1) Variable loss, the magnitude of which varies with the change of load, and is proportional to the secondary power or current passing through each element of the power grid. Including copper loss of overhead transmission and distribution lines and cable conductors of various voltage levels, copper loss of transformers, copper loss of cameras, voltage regulators, reactors, lightning arresters and arc suppression coils. 2) Fixed loss, which has nothing to do with the current of the load power passing through the elements, is related to the voltage applied to the power grid elements, including the iron loss of transmission and distribution transformers, cameras, voltage regulators, reactors, arc suppression coils and other equipment, and the corona loss of overhead transmission lines with voltages of 1 10kV or above; Insulation loss of cable capacitor, leakage loss of insulator and iron loss of current-voltage transformer; Loss of voltage winding and other accessories of user watt-hour meter.
9. What does the unified dispatching referred to in the Regulations on Power Grid Dispatching Management generally mean? How to show it in form?
A: The unified dispatching mentioned in the regulations means: 1) The power grid dispatching institution shall organize the compilation and implementation of the whole network dispatching plan in a unified way. 2) Unified command of the whole network operation and accident handling. 3) Unified arrangement and command of peak shaving, frequency modulation and voltage regulation of the whole network. 4) Coordinate and stipulate the operation of relay protection, safety automatic device, dispatching automation system and dispatching communication system in the whole network. 5) Unified, coordinated and rational utilization of hydropower stations and reservoirs. 6) Coordinate various relationships related to power grid operation according to rules and regulations. Formally, the unified scheduling table is used to schedule business, and the lower-level scheduling must obey the command of the higher-level scheduling.
10, what are the measures to improve the dynamic stability of power system?
Answer: The measures to improve the dynamic stability are: 1) quickly remove the short circuit fault; 2) Adopt automatic reclosing device; 3) The generator adopts electric braking and mechanical braking; 4) The neutral point of the transformer is grounded by a small resistor; 5) Set up a switching station and adopt series capacitor compensation; 6) Interlocking automaton and column disconnection are adopted; 7) Change the operation mode; 8) When the separation system fails; 9) Quickly control the speed regulating valve.
1 1. Why do the personnel on duty exchange signals for high frequency protection every day?
Answer: Because the high-frequency protection transceiver is composed of various radio components, the two ends of the protection are connected through high-frequency channels, and the protection device is complex. Any component damage may affect the correct action of the protection. If the transceivers on both sides are started for high-frequency signal exchange every day, you can check whether the transceivers and high-frequency channels are intact, and you can also find common faults when checking the channels. As long as it is handled in time, the normal operation of the equipment can be guaranteed.
12, how to determine the way of DC circuit disconnector? What should I pay attention to when running an operation?
Answer: The operation mode of DC circuit disconnector should be determined according to the network length, current and voltage drop. Generally, it is an open-loop operation mechanism. Precautions are as follows: 1) Before open-loop operation, it is necessary to find out that there is no possibility of power interruption; 2) When 2)DC system is grounded at two points with the same pole, it is forbidden to close the circuit isolating switch before finding out the reason and eliminating the fault.
13. What items should be tested after the circuit breaker is overhauled?
Answer: 1) Travel and synchronization test; 2) Low voltage closing test; 3) Opening and closing time; 4) opening and closing speed; 5) measure insulation resistance; 6) measuring contact resistance; 7) Measuring the dielectric loss of casing with multi-oil circuit breaker and leakage test with less oil circuit breaker; 8) AC withstand voltage; 9) Insulating oil test; 10) operation test.
14, what is the function of arc suppression coil? Why do you always turn on and off the tap?
Answer: Due to the large capacitance between overhead transmission lines and cable lines in power system, when a single-phase grounding occurs, the capacitance current IC flowing through the grounding point is √ 3U Ω C. The larger the power grid, the larger the IC. For example, the current of 6KV power grid can reach more than 100A, and it is difficult to extinguish the arc, which will cause a big accident. If an inductive arc suppression coil is added to the neutral point of the transformer, the inductance current and capacitance current formed by it will cancel each other, which is called current compensation. In order to get timely and reasonable compensation, in the operation of power grid, the tap of arc suppression coil is switched with the change of line increase and decrease, thus changing the magnitude of inductance current and achieving the purpose of timely and reasonable compensation.
15. How to calibrate the transformer?
Answer: First, use the running transformer to calibrate the phase of the voltage transformers on the two buses, then charge the primary bus with the newly put transformer, and then carry out the phase calibration. A phase meter or voltmeter is usually used. If the measurement results show that the two in-phase voltages are equal to zero and the out-of-phase voltages are line voltages, the phase sequences of the two transformers are consistent.
16, what are the rules for the acceptance of electrical equipment?
Answer: 1) All newly built, expanded, overhauled and pre-tested primary and secondary substation equipment must pass the acceptance and go through the formalities according to the relevant regulations and technical standards issued by the Ministry before it can be put into operation. 2) When intermediate acceptance is required for equipment installation or maintenance during construction, the person in charge of the substation shall designate a special person to cooperate, and the construction unit shall make a hidden record. The intermediate acceptance project shall be agreed by the person in charge of the substation and the construction and maintenance unit. 3) After overhaul, pre-test, relay protection and instrument inspection, the relevant maintenance personnel will record the relevant information in the record book and indicate whether it can be put into operation. There is no doubt to go through the completion formalities. 4) When the accepted single equipment fails to meet the acceptance standard and the system is in urgent need of operation, it can be put into operation only after being approved by the chief engineer of the competent bureau.
17. before the newly installed or overhauled on-load voltage regulating transformer is put into operation, what inspections should the operators carry out on the on-load voltage regulating device?
Answer: 1) The oil level of the oil storage tank of the on-load voltage regulator should be normal, there should be no leakage at the external seal, and the control box should be well dustproof. 2) Check the mechanical transmission device of on-load voltage regulation, and manually operate it for one cycle. The position indicator and action counter should act correctly, the mechanical locking of the limit position should act reliably, and the manual and electric interlocking should also be normal. 3) The terminals of the electric control circuit of the on-load voltage regulator should be in good contact, the rated current of the fuse used to protect the motor should match the motor capacity (generally twice the rated current of the motor), the motor should run in the main control room for one week, the travel indicator, position indicator and action counter should be correctly indicated, and the electric locking at the limit position should be reliable; The emergency stop button should be easy to use. 4) Gas protection of on-load voltage regulating device shall be connected to trip.
18. What items should be checked and accepted before the transformer is put into operation after new installation or overhaul?
Answer: 1) The transformer body is free from defects, neat in appearance, and free from serious oil leakage and paint peeling; 2) Transformer insulation test shall be qualified, without missing items. 3) The oil level of each part is normal, the opening and closing positions of each valve are correct, and the oil performance test, chromatographic analysis and insulation strength test are qualified. 4) transformer shell should have a good grounding device, and the grounding resistance should be qualified. 5) The positions of tap switches on each side should meet the requirements of power grid operation, the on-load voltage regulating device and electric manual operation are normal, and the pointer indication is consistent with the actual position. 6) The foundation is firm and stable, and the wheels should have reliable braking devices. 7) The measuring signal of protection and the connection of control loop are correct, all kinds of protection have been tested by actual transmission, and the actions are correct. The fixed values meet the requirements of power grid operation, and the protection connectors are put into operation. 8) The cooling fan is electrified and has a good trial operation. The fixed value of the fan self-starting device should be correct, and actual power transmission should be carried out. 9) The respirator should have qualified desiccant, and check that there is no blockage. 10) The distance between the lead wire of the main transformer and the line is qualified, and the contact of each part of the lead wire should be firm and good, and the temperature indicating wax sheet should be affixed. 1 1) The lightning protection of the transformer shall meet the requirements of the regulations. 12) There is no oil in the explosion-proof tube, the glass should be intact, and the breathing hole screw is in the right position. 14) Check the phase and wiring group of the transformer to meet the requirements of power grid operation. When the secondary and tertiary sides of the transformer may run in parallel with other power sources, the phase should be checked and the phase paint should be marked correctly and clearly. 15) thermometer and temperature measuring circuit are complete and good. 16) The small oil drain valve and gas release valve of the oil seal of the housing shall be free from blockage. 17) Nothing should be left on the transformer, and the adjacent temporary facilities should be dismantled, and the site should be cleaned after the permanent facilities are arranged.
19. What items should be checked before the newly installed capacitor is put into operation?
Answer: 1) The external inspection of the capacitor is intact and the installation is qualified. 2) The capacitor bank is connected and installed correctly. 3) All parts are connected firmly and reliably, and all capacitor shells and structures that are not insulated from the ground have been reliably grounded. 4) The capacity of discharge transformer meets the requirements, the test is qualified, and all parts are in good condition. 5) The capacitor protection and monitoring circuit is complete, and the transmission test is good. 6) Reactor and lightning arrester are in good condition and pass the test. 7) The capacitor meets the requirements, has passed the switching test, and should be in the off position before being put into operation. 8) The grounding isolating switch is in the off position. 9) Indoor ventilation is good, and cable trench has measures to prevent small animals. 10) capacitor is equipped with oil storage tank and fire extinguishing device. 1 1) The five-prevention interlocking installation is complete and reliable.
20. What are the requirements for the installation of indoor capacitors?
Answer: It should be installed in a well-ventilated, corrosive gas-free, violent vibration, impact, flammable and explosive room. 2) The installation capacitor should be arranged reasonably according to the capacity, and the safety patrol channel should be considered. 3) The capacitor room should be made of refractory materials, the door should be opened outwards, and fire control measures should be taken.
2 1. What basic requirements should the electrical measuring instrument installed on the control panel or switchboard meet?
Answer: 1) Instrument accuracy: AC instruments for generators and important equipment shall not be lower than1.5; The AC instruments used by other equipment and lines shall not be lower than Grade 2.5 and the DC instruments shall not be lower than Grade 1.5. The frequency should be digital or recorded, and the basic error is not greater than 0.02HZ when the measuring range is 45~55HZ. 2) Accuracy of instrument accessories: The accuracy of shunt, additional resistor and instrument transformer connected with the instrument should not be lower than 0.5, but when only measuring current and voltage, 1.5 and 2.5 instruments can use 1.0 transformer; Class 3.0 current transformer can be used for 2.5 ammeters in non-main circuit.
22. What will happen when the power system oscillates?
Answer: When the stability of the power system is destroyed, the generator lines in the system will lose synchronization and turn to asynchronous operation, and the system will oscillate. At this time, the power, current and voltage of some nodes on the generator power supply connection line will change to varying degrees. The voltage of the line or some nodes connecting the lost power plant will change to varying degrees. The place where the pointer of ammeter power meter swings the most and the voltage oscillates is the oscillation center of the system, which drops to zero about once every cycle. With the increase of the distance from the oscillation center, the voltage fluctuation gradually decreases. The pointer of stator ammeter of asynchronous generator swings the most violently (it may swing back and forth within the full scale range); Active and reactive precious hands also swing badly; Stator voltmeter pointer also swings, but it will not reach zero; Rotor current and voltmeter pointer swing around the normal value. The generator will produce abnormal and rhythmic roar; General action of forced excitation device; Transformer caused by voltage fluctuation. The iron core will also make an abnormal rhythmic roar.
23, comprehensive reclosing and relay protection device is how to connect?
Answer: The relay protection of 220KV line does not trip directly, but passes through the reclosing device, and the phase selector in the reclosing device can tell which phase the fault is. If it is a single-phase fault, only the fault phase will be tripped; if it is an interphase fault, three phases will be tripped. Because of the single-phase fault process
In order to appear in the non-full-phase operation state, all relay protections are generally divided into three categories and connected to the reclosing circuit. 1) can avoid the protection of non-full-phase operation, such as: high-frequency protection, zero-sequence section 1 (when the fixed value is large) and zero-sequence section 3 (when the time is long), connected to the N terminal of reclosing. These protections are worried that the protection will not quit when an open-phase operation occurs after tripping. At this time, if there is a fault, the protection can still trip. 2) you can't avoid the protection of non-full-phase operation, such as impedance protection and zero-sequence two stages, all of which are connected to the M end of reclosing. When these protections are not in full-phase operation, they will automatically quit operation. 3) Start the reclosing protection, connect the reclosing, and there is no need to reclose after the R terminal trips.
24, how to set the arc suppression coil in the power system?
Answer: 1) For multiple arc suppression coils, the arc suppression coils should not be installed in the same substation, and each independent part of the power grid should have compensation capacity. 2) The arc suppression coil should be installed at the transmission end of the power grid as far as possible to reduce the possibility that the arc suppression coil will be cut off when the power grid fails. 3) Try to avoid installing arc suppression coils in independent systems. Two or more arc suppression coils should be installed and different capacities should be selected to expand the adjustable range of inductor current.
25, in the compound rectifier DC system, what are the characteristics of series or parallel voltage source and current source?
Answer: Parallel compound rectifier: Both voltage source and current source are magnetic saturation regulators, so the output voltage is stable and the AC component is less. It is suitable for systems with strict requirements on DC power supply, such as transistor protection. However, compared with the series compound rectifier, the manufacture and debugging are more complicated, and the regulator is prone to heat, noise and low efficiency in operation. Series compound rectifier: the voltage source adopts ordinary transformer and the current source adopts fast saturation converter, which is simple to manufacture and debug, and it is not easy to generate heat and has no noise during operation. Because the DC output is in series, the residual voltage can be fully utilized, but the output voltage changes with the change of primary current, and the AC component is large. It is suitable for substations with no special requirements for DC power supply, and the battery can be charged and discharged for more than 750 times.
26. Whether the personnel on duty can change the operation mode of checking simultaneous reclosing and pressureless reclosing at will? Why?
Answer: Check the operation modes of synchronous reclosing and pressureless reclosing, and the personnel on duty shall not change them at will. Generally, synchronous reclosing is checked at one end of the line, and pressureless reclosing must be checked at the other end. Because the line operation is related to the system operation mode, the dispatcher should inform the substation to change the reclosing mode according to the system operation mode, and in addition, it is not allowed to change the operation mode of the line with two focuses on closing at will. If one end is checked for coincidence at the same time instead of pressureless coincidence, when the line fails, the pressheads at both ends are checked for pressureless coincidence after the circuit breaker trips, which causes the print heads at both ends to wait for synchronization, so that the line cannot be put into operation quickly after the instantaneous fault is eliminated, resulting in unnecessary power failure.
27, driving test circuit breaker, how can you drive at the same time check no voltage and reclosing twice?
Answer: 1) When there is no voltage on the bus and line, the common reclosing method can be used for transmission test. 2) When the line has no voltage (subject to the installation of the extraction device) and the bus has voltage, the voltage-free reclosing can be checked by the common reclosing method, and the lower contact of the synchronous relay should be shorted at the same time when the reclosing is checked by the power transmission test. 3) When there is voltage on the line, whether there is voltage on the bus side or not, the lower contact of the synchronous relay should be shorted separately during the power transmission test and voltage-free reclosing.
28. What are the minor repair projects of SW6-220 circuit breaker?
Answer: The minor repair items of the circuit breaker body are: 1) Cleaning and checking the porcelain sleeve, oil standard, oil drain valve and handling oil leakage; 2) Check the flange foundation screws and grounding screws; 3) Inject oil and check the closed retaining spring.
Minor repairs of hydraulic press include: 1) measuring the insulation of motor and secondary circuit. 2) Check the nitrogen pre-pressure. 3) Replenish hydraulic oil. 4) Check the auxiliary switch and microswitch. 5) Check the sealing box of heater and mechanism. 6) Opening and closing operation test.
29. What should the attendant do to replace the submersible pump of the forced oil circulation transformer?
Answer: 1) A second working ticket is required to replace the submersible pump; 2) Disconnect the relevant power supply of submersible pump; 3) Apply for dispatching and agree to change the heavy gas protection from trip to signal; 4) After the submersible pump is put into operation, pay attention to check the sound and oil flow direction of the submersible pump, and then check it according to the normal patrol time after the situation is normal. Continuous operation of heavy gas protection 1h, and switch to the tripping position when the pressure plate is still.
30. Before the main transformer is put into operation after new operation or overhaul, why do you want to do impact test and impact several times?
Answer: 1) When pulling open the no-load transformer, there may be operating overvoltage. When the neutral point of the power system is not grounded or grounded through the arc suppression coil, the overvoltage amplitude can reach 4~4. 5 times of phase voltage; When the neutral point is directly grounded, the phase voltage can reach 3 times. In order to check whether the insulation strength of the transformer can withstand full voltage or operating overvoltage, an impact test is needed. 2) When no-load transformer is charged, inrush current will appear, and its value can reach 6~8 times of rated current. The inrush current begins to decay rapidly, generally at 0. 0 after 5 ~ 1 25~0。 5 times the rated current, but the total attenuation time is long, and the large-capacity transformer can reach tens of seconds. Because the inrush current produces a great electromotive force, in order to check the mechanical strength of the transformer and whether the inrush current will cause misoperation of the relay protection at the initial stage of attenuation, an impact test is needed. 3) Impact test times: 5 new products are put into use. After the overhaul, the investment is three times that of the original.
3 1, how to operate with bus coupler circuit breaker?
Answer: 1) Change the double bus to single bus operation mode. 2) Stop bus coupling. 3) The charging power supply is connected in parallel to the bus. 4) Put the parallel selector switch into the synchronization device. 5. Check the operation of voltmeter, frequency meter and step meter to meet the requirements of juxtaposition. 6) When the synchronizer pointer rotates from the synchronous position to 30 degrees, manually close the bus coupler circuit breaker. If there is no abnormality, it is tied for success.
32, substation should have what record book?
Answer: 1) Dispatching instruction operation record book; 2) Run the work record book; 3) The equipment lacks a record book; 4) Circuit breaker fault trip record book; 5) Record book of relay protection and automatic device debugging; 6) High frequency protection exchange signal record book; 7) Equipment maintenance and test record book; 8) battery adjustment and charge-discharge record book; 9) Lightning arrester action record book; 10) accident prediction record book; 1 1) Anti-accident drill record book; 12) safety activity record book; 13) accident, obstacle and abnormal operation record book; 14) Run the analysis record book; 15) training record book.
33, substation should have any indication chart?
Answer: 1) system simulation board; 2) Main operating parameters of the equipment; 3) relay protection and automatic device setting table; 4) Annual major, minor repair and preventive test plan for substation equipment; 5) Regular maintenance plan for substation equipment; 6) Monthly maintenance work plan of substation; 7) Identification diagram of substation equipment grade; 8) List of personnel who have the right to issue dispatching operation tickets; 9) List of persons who have the right to issue working tickets; 10) List of personnel who have the right to patrol high-voltage equipment alone; 1 1) list of authorized guardians; 12) emergency switch sequence table; 13) emergency telephone list for accident handling; 14) safety record signboard. 15) routine patrol road map; 16) equipment dedicated to manual instruments; 17) health responsibility division table; 18) primary system wiring diagram; 19) station power system diagram; 20) DC system diagram; 2 1) training schedule; 22) Main operating parameters of the equipment; 23) grounding selection sequence table.
34, substation must establish what technical files?
Answer: 1) Equipment manufacturer's instruction manual; 2) Electrical equipment factory test records; 3) Information related to installation and handover; 4) Electrical equipment improvement, major repairs, construction records and completion reports; 5) Report on overhaul and unscheduled preventive test of electrical equipment over the years; 6) Special report on accidents, obstacles and operation analysis of electrical equipment; 7) Records of serious defects, equipment variation and improvement of electrical equipment.
35. What is the task of insulation supervision of substation operators?
Answer: 1) Grasp the pre-test plan and completion of high-voltage electrical equipment under its jurisdiction in time. 2) Conduct vertical and horizontal analysis on the test results of high-voltage electrical equipment under its jurisdiction, grasp the insulation situation of electrical equipment, and urge to deal with the defects found in the test. 3) Establish and improve the technical data for insulation supervision of substation equipment.
Short answer questions:
1. What are the regulations on the use and management of fire-fighting appliances in substations?
Answer: 1) Fire fighting equipment is a special tool for fire fighting. It should be stored in a special fire fighting toolbox or a designated place, and managed by firefighters in a unified way. No one can use it for other purposes. 2) Fire fighting equipment should be kept in good condition, and if it is out of date, invalid or damaged, it should be reported to the Security Department for handling; 3) The personnel on duty shall not check and turn on the fire extinguisher at ordinary times. 2. What should I do if the injured person gets well?
Answer: 1) If the heartbeat and breathing of the electrocuted person have recovered after rescue, cardiopulmonary resuscitation can be stopped; 2) Cardiac arrest may occur again in the early stage of heartbeat recovery, so it should be closely monitored, and it should not be careless, and be ready for rescue again at any time; 3) After the initial recovery, if you are delirious, delirious or restless, try to keep the wounded quiet.
3. Under what circumstances is CPR used, and what are its three basic measures?
Answer: 1) When the person who gets an electric shock stops breathing and heartbeat, he should immediately carry out on-site rescue according to the three basic measures of cardiopulmonary resuscitation to support life. 2) The three basic measures for the failure of cardiopulmonary resuscitation are: airway patency; Mouth-to-mouth (nose) artificial respiration; Chest compression, not satisfied (artificial circulation).
4. What should I pay attention to when moving long objects such as ladders in outdoor substations and high-voltage rooms?
Answer: 1) two people should put it down and carry it; 2) Keep a safe enough distance from the live part.
5. What should I pay attention to when using a blowtorch near live equipment?
Answer: 1) When using a portable open flame or blowtorch, the distance between the flame and the live part. A, the voltage in 10KV and below, shall not be less than 1. 5 million. B, when the voltage is above 10KV, it shall not be less than 3m ... 2) Don't light the stove or sand blasting lamp near the following equipment. A, the fire line; B, live equipment; C. oil switch.
6. What should be paid attention to when measuring insulation with a shaking table near live equipment?
Answer: 1) The surveyors and the shaking table must be placed in proper positions, and a safe distance must be kept to prevent the lead bracket of the shaking table from touching the live part; 2) When moving wires, care must be taken to prevent the staff from getting an electric shock.
7. What is the safety responsibility of the working ticket issuer?
A: 1) necessity of work; 2) Whether the work is safe; 3) Whether the safety measures filled in the working ticket are correct and complete; 4) Whether the assigned staff and shift staff are appropriate and sufficient, and whether they are in good mental state.
8. What are the safety responsibilities of the shift supervisor in the working ticket?
A: 1) necessity of work; 2) Whether the maintenance cycle is consistent with the approval cycle; 3) Whether the safety measures listed in the working ticket are correct and complete.
9. What should I pay attention to when using power tools?
Answer: 1) It is not allowed to carry wires or rotating parts of power tools; 2) When using tools on ladders, safety measures should be taken to prevent loss; 3) When using power tools, if you leave the workplace or temporarily stop working for some reason, you must immediately cut off the power supply in case of temporary power failure.
10. How to give first aid to electric burn, flame burn or high temperature gas or water burn?
Answer: 1) Keep the wound clean to prevent electric burn, flame burn or high temperature gas or water burn; 2) Cut the clothes, shoes and socks of the wounded with scissors and take them off; 3) All wounds are covered with clean cloth to prevent pollution; 4) When the limbs are burned, rinse them with clean cold water first, and then wrap them with clean cloth or sterile gauze.
1 1. What are the principles and judgments of trauma first aid?
A: 1) In principle, creative first aid is to rescue first, then fix it, and then carry it; 2) Pay attention to take measures to prevent injury from aggravating or pollution. Need to be sent to hospital for treatment, should immediately take measures to protect the wounded before being sent to hospital for treatment; 3) Before the rescue, lie down quietly and judge the general situation and degree of injury, such as bleeding, fracture and shock.
12, what should I pay attention to in normal mouth-to-mouth (nose) breathing?
Answer: 1) Blow twice at the beginning; 2) Normal mouth-to-mouth (nose) breathing does not need to be too big, so as not to cause bloating; 3) When blowing and relaxing, pay attention to the breathing movements of the wounded chest; 4) If the resistance is large when blowing, it may be that the head is not tilted back enough, and it should be corrected in time.
13. What is the safety responsibility of the work permit holder?
Answer; 1) is responsible for reviewing whether the safety measures listed in the working ticket are correct and complete, and whether they meet the site conditions; 2) Whether the safety measures at the job site are perfect; 3) Be responsible for checking whether there is any danger of suddenly calling power-off equipment; 4) Even if you have little doubt about the contents listed in the working ticket, you must ask the working ticket issuer clearly and make detailed supplements when necessary.
14. What are the requirements of electrical workers for safety testing?
Answer: 1) Electrical workers should take this regulation once a year; 2) If the electrical work is interrupted for more than three months for any reason, the administrative organ must review this regulation; And after passing the exam, you can return to work.
15, what must an electrician have?
Answer: 1) According to the doctor's appraisal, there is no disease that hinders work (physical examination is about once every two years); 2) Have the necessary electrical knowledge; According to his post and work nature, he is familiar with the relevant parts of the Electric Power Safety Work Regulations (electrical parts, power lines, thermal and mechanical parts of power plants and substations); Pass the examination of "Electrical Safety Regulations"; 3) Learn emergency rescue methods, especially electric shock first aid.
16. What are the duties and tasks of the personnel on duty in the switching operation?
Answer: Strictly abide by the rules and regulations, conscientiously implement the operation monitoring system, change the state of electrical equipment correctly and substantially, and ensure the safe, stable and economical continuous operation of power plants, substations and power grids. This is the responsibility and task of all levels of power system dispatching and electrical duty personnel's switching operation.
17. What should I pay attention to when using a ladder on a wooden board or concrete floor?
Answer: 1) It must be equipped with a pointed metal object at its lower end; 2) Or tie the lower end of the ladder with a rope.