51 What are the factors that affect the degree of harm to the human body caused by electric shock?
Answer: Factors such as the magnitude of the current, the duration of the current, the path of the current, the resistance of the human body and the frequency of the current.
52 Types of electric shock?
Answer: Direct electric shock, indirect contact electric shock, induced voltage electric shock, lightning electric shock, electrostatic electric shock.
53. What are the organizational measures to ensure safety when working with electrical equipment?
Answer: work ticket system, operation ticket system, inventory site and comprehensive disclosure system, work permit system, work guardianship system, work interruption and work transfer system and work termination and power transmission system.
54. What is the role of the DC system in the substation?
Answer: The DC system provides reliable DC power supply for control signals, relay protection, automatic devices and accident lighting in the substation, and also provides reliable operating power for operation. The reliability of the DC system plays a vital role in the safe operation of the substation and is the guarantee for the safe operation of the substation.
55. What are the commonly used DC power sources in substations?
A: Battery, silicon current, and capacitive energy storage.
56. What is Phase Order?
Answer: It is the order of the phases, which is the sequence in which the instantaneous value of alternating current changes from negative to positive through zero
57. What is the safe distance of the human body grounding point in the event of a grounding fault in high-voltage equipment?
A: It should be larger than 4 m indoors and 8 m larger outdoors.
58. Which electrical equipment must be grounded or zeroed protected?
Answer: (1) The base and shell of generators, transformers, motors, high and low voltage electrical appliances and lighting appliances; (2) the secondary coil of the transformer; (3) the framework of the switchboard and the control panel; (4) Transmission device of electric equipment; (5) Metal structure, concrete frame and metal fence of power distribution devices inside and outside the house; (6) Cable head and cable box shell, cable sheath and threading steel pipe; (7) The tower of the power line and the switchgear and capacitors installed on the pole of the distribution line.
59 What data is marked on the nameplate of the asynchronous motor? What does each mean?
Answer: The following data is mainly marked on the nameplate of AC asynchronous motor, and its significance is explained as follows:
(1) Rated power (P): It is the output power on the shaft of the motor.
(2) Rated voltage: refers to the voltage of the line added on the winding.
(3) Rated current: stator winding line current.
(4) Rated speed (r/min): the number of revolutions under the rated load.
(5) Temperature rise: refers to the insulation level that exceeds the ambient temperature.
(6) Working quota: that is, the allowable working operation mode of the motor.
(7) Winding connection: Δ or Y connection, corresponding to the rated voltage.
60 What to do if you notice someone being electrocuted?
Answer: First of all, make the electrocuted person quickly disconnect from the power supply. The method, for low-voltage electric shock, can be used "pull", "cut", "pick", "pull", "pad" method, pull or cut off the power supply, the operation should pay attention to avoid people rescue people electric shock, should use dry and insulated sharp tools or objects, to complete the cut off power supply or make the electric shock and the power supply isolated. For high-voltage electric shock, the power supply department should be notified to make the electric shock circuit power off, or use an insulating tie rod with a corresponding voltage level to pull the drop-out fuse to cut off the circuit. Or take the method of making the line short circuit cause tripping and disconnecting the circuit. It is also necessary to pay attention to the safety of rescuers and prevent electric shock from stepping voltage.
If the person who is electrocuted is electrocuted at a high place, he should pay attention to prevent falling and injury. After the person is disconnected from the power supply, they are quickly taken to the hospital or emergency according to the severity of the injury.
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