2022 high voltage electrician examination skills and high voltage electrician reexamination examination

Source of question bank ： Safety production simulation test, a little public official account.

Pass the safety production simulation exam at one point ： High voltage electrician examination skills must be practiced before the examination ！ The safety production simulation test is passed at one point, and the examination questions and answers of high-voltage electrician review are updated every month ！ Do it a few more times , In fact, passing the high-voltage electrician operation simulation exam is very simple .

1、【 Single topic selection 】 () Its function is to assemble suspension insulators into strings , Connect one or more strings of insulators and hang them on the cross arm .（  B  ）

A、 Support fittings

B、 Connecting fittings

C、 Connecting fittings

2、【 Single topic selection 】 The equipment with residual current protector and the equipment without residual current protector cannot share one set ().（  B  ）

A、 Power Supply

B、 Grounding device

C、 Zero line

3、【 Single topic selection 】 As shown in the figure , It is known that UAB by 10V, stay R1 Voltage drop on the U1 by 5V, electric current IAB by 5A, seek R2 Voltage drop on the U2 And resistance R2 Values that match the following options are ().

（  A  ）

A、5V,1Ω

B、5V,2Ω

C、10V,1Ω

4、【 Single topic selection 】 Insulating boots ( shoes ) Belong to ().（  A  ）

A、 Auxiliary safety appliances

B、 General protective safety equipment

C、 Insulation safety appliances

5、【 Single topic selection 】 Overhead line conductors pass through () The allowable current should not be exceeded .（  A  ）

A、 Maximum load current

B、 Short circuit current

C、 Rated current

6、【 Single topic selection 】 The single-phase electric shock risk of neutral grounded system is higher than that of ungrounded system ().（  B  ）

A、 Small

B、 Big

C、 equal

7、【 Single topic selection 】 The opening and closing indicator of the circuit breaker shall (), And the instructions are accurate .（  C  ）

A、 Close with metal

B、 It can be adjusted at will

C、 Easy to observe

8、【 Single topic selection 】10kV The substation shall be located at () Valve type lightning arrester is installed on the .（  C  ）

A、 Single group bus and overhead line of each circuit

B、 Each set of busbar and single circuit overhead line

C、 Each set of busbar and each circuit overhead line

9、【 Single topic selection 】 If during the shift change , Important operations are required , Still by () Responsible for handling , If necessary, ask the successor to assist in the work .（  B  ）

A、 dispatcher

B、 Shift handover personnel 、 Successors

10、【 Single topic selection 】 The safety sign is to remind people to recognize and be vigilant () factors , It plays an important role in preventing people from accidentally touching or getting too close to the charged body and getting an electric shock .（  A  ）

A、 dangerous

B、 Security

C、 harm

11、【 Single topic selection 】 High voltage fuses can be used for () Protection of and other equipment .（  C  ）

A、 Circuit breaker

B、 Alternator

C、 Voltage transformer

12、【 Single topic selection 】 The lightning wave intrudes into the transformer along the transmission line 、 Distribution substation or electrical equipment , Damage to electrical equipment of substation and line , This form of destruction is called ().（  C  ）

A、 Hit the thunder

B、 Induction mine

C、 Lightning wave intrusion

13、【 Single topic selection 】 The following () Indicates current relay .（  C  ）

A、KT

B、KS

C、KA

14、【 Single topic selection 】 In order to supply stable voltage, control power flow or adjust load current , The transformer shall be tested () adjustment .（  A  ）

A、 voltage

B、 electric current

C、 Meritorious

15、【 Single topic selection 】 transformer 、 motor 、 Iron core of generator, etc , And electromagnets () Magnetic material .（  A  ）

A、 iron

B、 along

C、 back

16、【 Single topic selection 】 When the transformer is in normal operation, it sends out ().（  A  ）

A、 A uniform hum

B、 Intermittent buzzing

C、 Even boiling sound

17、【 Single topic selection 】 KYN28-10 The interlocking device for preventing misoperation of trolley and grounding switch in series high-voltage switchgear includes ().（  B  ）

A、 When the rocker of grounding switch has not been removed , The trolley can change from the positioning state of the test position to the moving state

B、 The grounding switch is in the closing position , The trolley cannot change from the positioning state to the moving state

C、 The grounding switch is in the opening position , The trolley cannot change from the positioning state to the moving state

18、【 Single topic selection 】 The function of electric pole chuck ().（  B  ）

A、 Bear the downward pressure of the pole

B、 To prevent the pole from tilting

C、 In case the pole is pulled up

19、【 Single topic selection 】 When the conductor temperature of the cable is equal to the maximum long-term operating temperature of the cable , The load current when the heating and heat dissipation in the cable are balanced is called ().（  A  ）

A、 Long term allowable current carrying capacity of cable

B、 Allowable current carrying capacity for a short time

C、 Short circuit allowable current carrying capacity

20、【 Single topic selection 】 The iron core and shell of the secondary winding of the current transformer must be (), To prevent a 、 When the insulation of the secondary coil breaks down , The high pressure on the primary side flows into the secondary side , Endanger personal and equipment safety .（  C  ）

A、 Separate grounding

B、 Ungrounded

C、 Reliable grounding

21、【 Single topic selection 】 Transformer protection belongs to () classification .（  B  ）

A、 Protection principle

B、 Protected object

C、 The role of protection

22、【 Single topic selection 】 For grounding resistance measuring instrument 120r/min When shaking the handle at a speed of , The watch can send out ()Hz100V Left and right AC voltage .（  B  ）

A、50

B、110

C、120

23、【 Single topic selection 】 Handover test shall be conducted before laying new cables , After the completion of installation and before putting into operation ().（  C  ）

A、 AC withstand voltage test

B、 DC withstand voltage test

C、 Handover test

24、【 Single topic selection 】 Commonly known as reinforced concrete pole ().（  A  ）

A、 Cement pole

B、 Straight bar

C、 Metal rod

25、【 Single topic selection 】 According to the working principle of the transformer , Changing transformer is often used () The purpose of voltage regulation can be achieved by the method of .（  B  ）

A、 Insulation ratio

B、 Turns ratio

C、 Current ratio

26、【 Single topic selection 】 The electromotive force of the power supply is equal to the external force to overcome the electric field force and put the unit positive charge inside the power supply () The work done .（  A  ）

A、 Move from negative to positive

B、 Move from positive to negative

C、 Move from head to tail

27、【 Single topic selection 】 The unit of current intensity is ().（  C  ）

A、 Coulomb

B、 Volt

C、 Ampere

28、【 Single topic selection 】 The diameter of the lightning rod installed on the top of the chimney shall not be less than the following values ().（  C  ）

A、10mm

B、25mm

C、20mm

29、【 Single topic selection 】 () Is to change the high voltage of the system to the standard low voltage (100V or 100/√3V), For measuring instruments 、 Automatic relay protection device 、 For computer monitoring system .（  C  ）

A、 transformer

B、 Current transformer

C、 Voltage transformer

30、【 Single topic selection 】 High voltage capacitor banks with small and medium capacity are equipped with delay current quick break protection , The action time limit can be (), In order to avoid the closing inrush current of the capacitor .（  C  ）

A、0.1s

B、0.3s

C、0.2s

31、【 Single topic selection 】 Without damaging the transformer () And reduce the service life of the transformer , The maximum capacity that the transformer can output in a short time is the overload capacity of the transformer .（  C  ）

A、 Casing

B、 coil

C、 insulation

32、【 Single topic selection 】 Burning and () The principle of explosion is the same .（  C  ）

A、 Physics

B、 nucleus

C、 chemical

33、【 Single topic selection 】 The disconnector is operated by an operating mechanism , It is convenient to connect the disconnector and () Install anti misoperation locking mechanism .（  C  ）

A、 Between busbars

B、 And the measuring instrument

C、 Between circuit breakers

34、【 Single topic selection 】 Commonly used in power system Y,d11 Connected transformer , The current on the triangle side is higher than the same phase current on the star side , Lead in phase () degree .（  B  ）

A、60

B、30

C、120

35、【 Single topic selection 】 The picture below is commonly used ().

（  B  ）

A、 Installation wiring diagram

B、 Expanded schematic diagram

C、 Summary schematic diagram

36、【 Single topic selection 】 The incoming voltage of the power supply is 10KV Users of , Generally, the total step-down and transformation will 10KV The voltage drops to ()V after , Then, the power is supplied to each electric field through the low-voltage distribution line , Supply power to low-voltage electrical equipment .（  C  ）

A、500/400

B、380/260

C、380/220

37、【 Single topic selection 】 () It refers to the standby power supply or standby equipment or standby line with obvious disconnection under normal conditions .（  A  ）

A、 Open standby

B、 Cold standby

C、 Dark standby

38、【 Single topic selection 】 In the circuit , Connect two or more resistors in the order of head to tail connection , Called resistance ().（  A  ）

A、 Series connection

B、 Mixed combination

C、 parallel connection

39、【 Single topic selection 】 In a circuit with three resistors in parallel , It is known that the currents of the three parallel branches are 4A8A and 15A, Then the current of the circuit is equal to ()A.（  C  ）

A、9

B、15

C、27

40、【 Single topic selection 】 Metal oxide arresters shall be () safekeeping .（  B  ）

A、 Place against the wall

B、 Stand vertically

C、 Horizontal placement

41、【 Single topic selection 】 The iron core and shell of the secondary winding of the current transformer must be (), To prevent insulation breakdown of primary and secondary coils , The high pressure on the primary side flows into the secondary side , Endanger personal and equipment safety .（  C  ）

A、 Separate grounding

B、 Ungrounded

C、 Reliable grounding

42、【 Single topic selection 】 Relative numbers are often used for () in .（  C  ）

A、 Summary schematic diagram

B、 Screen layout

C、 Installation wiring diagram

43、【 Single topic selection 】 When working in the substation , The work permit holder shall work with () Go to the site to check whether the safety measures are complete and reliable , And the inspection proves that there is no voltage in the maintenance equipment ;（  C  ）

A、 Work ticket issuer

B、 Operator on duty

C、 Person in charge of the work

44、【 Single topic selection 】 When measuring the insulation of electrical equipment with a megger ,“ line ”(L) The terminal post shall be connected to ().（  C  ）

A、 The insulation of the cable

B、 On the shell or ground wire of electrical equipment

C、 Motor winding or conductor

45、【 Single topic selection 】 In order to improve the reliability and economy of power supply , Rational use of power resources , Give full play to the role of hydropower plants , And reduce the total installed capacity and standby capacity , Now all kinds of power plants and substations pass through () Connect into a system .（  A  ）

A、 Transmission and distribution lines

B、 Power lines

C、 Power lines

46、【 Single topic selection 】 The relative permeability of antimagnetic material ().（  C  ）

A、 be equal to 1

B、 Greater than 1

C、 Less than 1

47、【 Judgment questions 】 The neutral point of the power supply is grounded through the arc suppression coil , The purpose is to reduce the grounding current .（  √  ）

48、【 Judgment questions 】 Cross sectional area of high voltage bus of ring main cabinet , It shall be selected according to the sum of load current and through current of the substation .（  √  ）

49、【 Judgment questions 】 Overvoltage in power system can be divided into two categories : External overvoltage and internal overvoltage .(？)（  √  ）

50、【 Judgment questions 】 In step-down substation , In order to limit the short-circuit current in medium voltage and low-voltage distribution devices , The low voltage side of the transformer can be operated separately .（  √  ）

51、【 Judgment questions 】 The rated capacity of double winding transformer is the rated capacity of winding .（  √  ）

52、【 Judgment questions 】 The temporary barrier shall be set around the patrol channel and maintenance equipment where the human body may approach the electrified body .（  ×  ）

53、【 Judgment questions 】 When checking electricity , Electroscope with qualified voltage level shall be used , Install the grounding wire or close the grounding knife switch ( device ) Check the electricity of each phase at the .()（  √  ）

54、【 Judgment questions 】 10kV And below three-phase power supply , The allowable voltage deviation is... Of the rated voltage ±10%.（  ×  ）

55、【 Judgment questions 】 A three-phase AC circuit has three alternating electromotive forces , They have the same frequency and the same phase .()（  ×  ）

56、【 Judgment questions 】 In a circuit with parallel resistors , The terminal voltage of the circuit U Equal to the terminal voltage of each parallel resistor .（  √  ）

57、【 Judgment questions 】 The function of automatic operation device is to improve the power supply reliability of power system and ensure safe operation .（  √  ）

58、【 Judgment questions 】 Power cable armor and sheath are used to protect the cable from external force damage .（  √  ）

59、【 Judgment questions 】 One of the reasons for the expansion of the shell of high voltage capacitor is the internal partial discharge .（  √  ）

60、【 Judgment questions 】 Sulfur hexafluoride (SF6) Sulfur hexafluoride for circuit breaker (SF6) Gas is used as insulating medium and arc extinguishing medium .（  √  ）

61、【 Judgment questions 】35~110kV Overhead lines , If the lightning conductor is not erected along the whole line , It should be in the substation 1~2km Install lightning protection wire in the incoming section of .(？)（  √  ）

62、【 Judgment questions 】 The current in the circuit can be measured with an ammeter , When measuring, the ammeter is connected in parallel in the circuit .（  ×  ）

63、【 Judgment questions 】 In abnormal operation and handling of circuit breaker , The personnel on duty found that when the opening release of the circuit breaker refused to operate , Apply for immediate processing .（  √  ）

64、【 Judgment questions 】 Based on electrical circuit , The coil contacts of the relay and each element shall be protected in the order of action , Wiring diagram drawn from left to right and from top to bottom , It is called installation drawing .()（  ×  ）

65、【 Judgment questions 】 Work on indoor high-voltage equipment , The barrier of equipment interval shall be operated on both sides and opposite to the working place ( enclosure ) And no passage barriers ( enclosure ) Hang on “ Stop , High pressure danger !” The signboard .（  √  ）

66、【 Judgment questions 】 Current transformers are divided into current transformers for measurement and current transformers for protection .（  √  ）

67、【 Judgment questions 】 The longer the current lasts , The more serious the harm of electric current to human body .（  √  ）

68、【 Judgment questions 】 For outdoor switching operation in rainy days, the insulating rod with rain cover shall be used as required .（  √  ）

69、【 Judgment questions 】 The residual magnetism in the iron core of the clamp meter only affects the high current measurement , It has no effect on small current measurement .（  ×  ）

70、【 Judgment questions 】 Use coal, oil, natural gas, etc. as fuel , The chemical energy of fuel combustion is converted into heat energy , Then, with the help of thermal machinery such as steam turbine, the heat energy is changed into mechanical energy , The steam turbine drives the generator to change mechanical energy into electrical energy , This kind of power plant is called thermal power plant .()（  √  ）

71、【 Judgment questions 】 Switching operation after the end of each operation , The operator shall carefully check the status of the operated equipment , The state of the operated equipment shall meet the requirements of the operation items , And in good condition .（  ×  ）

72、【 Judgment questions 】 A three-phase AC circuit has three alternating electromotive forces , They have the same frequency 、 Phase difference 120°.（  √  ）

73、【 Judgment questions 】 For differential protection , Differential protection on both sides of the transformer CT All shall be connected into a star .（  ×  ）

74、【 Judgment questions 】 The voltage of high-voltage distribution lines is generally 10kV20kV.()（  ×  ）

75、【 Judgment questions 】 When the circuit is short circuited , The current in the circuit will be many times greater than that in the circuit .（  √  ）

76、【 Judgment questions 】 35kV And below power lines are generally not equipped with lightning wires along the whole line .（  √  ）

77、【 Judgment questions 】 In order to ensure the safety of electrical operation , The new staff can only accept the factory 、 Two level safety education of workshop and other departments , To engage in electrical work .（  ×  ）

78、【 Judgment questions 】 The tower foundation is to fix the tower underground , To ensure that the tower does not tilt or collapse .（  √  ）

79、【 Judgment questions 】 The tubular lightning arrester is composed of internal clearance and external clearance of the gas production pipe .(？)（  √  ）

80、【 Judgment questions 】 The power failure and switching operation must be in accordance with the circuit breaker ( switch )→ Power side disconnector ( Knife switch )→ Load side disconnector ( Knife switch ) Operate in sequence .（  ×  ）

81、【 Judgment questions 】 The insulation strength of auxiliary safety appliances is low , Unable to withstand the working voltage of high-voltage live equipment or lines , It can only strengthen the insulation of basic safety appliances .（  √  ）

82、【 Judgment questions 】 To ensure safety , Generally, the height of enclosure of outdoor substation shall not be less than 3 rice .（  ×  ）

83、【 Judgment questions 】 When the load in the circuit is resistive load , The recovery voltage is equal to the supply voltage , Not conducive to arc extinction .（  ×  ）

84、【 Judgment questions 】 Capacitor overload is a common fault and abnormal operation state of high voltage power capacitor .（  √  ）

85、【 Judgment questions 】 In our country 110kV And 110kV The above power system , The neutral point non direct grounding operation mode is adopted , To reduce the insulation level of the line .（  ×  ）

86、【 Judgment questions 】 In circuit , The resistance of a conductor to the appearance of an electric current is called resistance , With the parameters R Express .（  √  ）

87、【 Judgment questions 】 Fittings must have sufficient mechanical strength , And can meet the requirements of corrosion resistance .（  √  ）

88、【 Judgment questions 】 In electrical construction , We must abide by the relevant national safety rules and regulations , When installing the electrical circuit, it shall be installed according to the actual situation in the principle of convenience for users .（  ×  ）

89、【 Judgment questions 】 In switching appliances , According to the direction of gas blowing arc , The method of blowing arc can be divided into longitudinal blowing ( Longitudinal blowing ) And lateral blowing ( Horizontal blow ) Two kinds of .（  √  ）

90、【 Judgment questions 】 Most overhead conductors are made of steel cored aluminum strand , The main function of its steel core is to improve the conductivity .（  ×  ）

91、【 Judgment questions 】 Dry type transformer refers to the transformer whose core and winding are immersed in insulating liquid .（  ×  ）

92、【 Judgment questions 】 Lightning strikes buildings or other objects directly , Discharge it , Powerful lightning currents enter the ground through these objects , Produce destructive thermal and mechanical effects , This damage form of lightning is called direct lightning overvoltage .(？)（  √  ）

93、【 Judgment questions 】 The impulse current generated by short circuit will produce great electric power , Its size can be used to verify the dynamic stability of electrical equipment in case of short circuit .（  √  ）

94、【 Judgment questions 】 High voltage switchgear shall be protected from load pulling 、 The locking function of closing the disconnector does not belong to “ Five precautions ” Interlock function .（  ×  ）

95、【 Judgment questions 】 The cross arm is positioned on the upper part of the pole , Used to support insulators, conductors, etc , And make the distance between conductors meet the specified distance .（  √  ）

96、【 Judgment questions 】 The wiring groups are the same and in parallel , There will be a voltage difference between the low-voltage sides connected to the transformer , Form circulation , In serious cases, the transformer will be burnt out .（  ×  ）

97、【 Judgment questions 】 The unit of voltage and potential difference is Ohm , Use letters V Express .（  ×  ）

98、【 Judgment questions 】 When the heat emitted is equal to the heat generated , The temperature of all parts of the transformer reaches a stable level , No longer rise .（  √  ）

99、【 Judgment questions 】 Most overhead conductors are made of steel cored aluminum strand , The main function of its steel core is to improve the mechanical strength .（  √  ）

100、【 Judgment questions 】 The conductor resistance is proportional to the length and cross-sectional area of the conductor , And related to the properties of the material .()（  ×  ）

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