strong electrical knowledge
1 should be based on the location of electrical equipment to determine the line direction, elevation and the switch, outlet location.
2 power cable wiring, the wire cross-sectional area with electrical equipment should meet the maximum output power.
3 dark line pipe must be laid. When the pipe length exceeds 15m, or there are two right-angle bend, should be an additional cable box.
4 wires should penetrate the same circuit with a tube, but the total number of roots inside the pipe should not be more than four, the total wire cross-sectional area (including the insulating sheath) should not exceed the pipe cross-sectional area of 40%.
5 Power lines and communication lines with a tube can not penetrate.
6 power cord and plug sockets and TV lines and horizontal spacing of not less than 500mm.
7 wires and the heating, hot water, gas pipes not less than the distance between the parallel 300mm, cross-distance of not less than 100mm.
8 wire connector pipe penetration shall be located in the terminal box, lap joints should be solid, insulating tape wrapping should be uniform closely.
9 to install an electrical outlet, the outlet for the left side should be connected to the zero line (N), the right side should be connected to phase line (L), the middle at the top should be connected to protective earth (PE).
10 when the chandelier in the 3kg weight and above, should be installed in the rear roof embedded parts, and then fixed to the rear lamps on the embedded parts. Allowed to be installed in the wedge, wooden tiles.
11 connecting switch, screw lamp wire, the phase line should be connected switch, switch leads to the phase center should be connected to the lamp terminal, the zero line should be connected at the end of the thread.
12 between conductors and ground wires between the resistance must be greater than 0.5MΩ.
13 the same room power, telephone, television and other outlets should be at the same level panel elevation, the height should be less than 5mm.
14 kitchen and bathroom should be installed splash sockets, switches should be installed in the door opening side of the wall.
15 outlet to the bottom margin should be for the 300mm, flat switch plate to the bottom margin should be as 1400mm.
I. Glossary:
1,
nike air force, three-phase AC: the same three frequencies, the amplitude of electric potential equal to 120 ° phase angle difference between each circuit consisting of AC power system, called the three-phase alternating current.
2, a device: direct transmission and distribution and production of electricity and related equipment as a device. Including high-voltage circuit breaker, disconnecting switch, bus, power cables, voltage transformers, current transformers, reactors, arrester, arc suppression coil, shunt capacitors and high voltage fuses and so on.
3, the second device: a device for monitoring, measurement, control and manipulate the protective effect of auxiliary equipment. Such as various relays, signal devices, measuring instruments, recording wave recording devices and telemetry, remote control devices and a variety of cables, a small bus and so on.
4, high voltage circuit breaker: Also known as high-voltage switch, which can not only cut off high-voltage circuit or close-load current and load current, and when the system fails, through the role of protection devices, cutting off the load current and short-circuit current. It has a very comprehensive interrupter structure and adequate drying capacity.
5, load switch: load switch isolation switch similar to the structure of the Secretariat, but the installation of a simple interrupter device. It is also a clear break point, a certain degree of drying capacity, can take the load operation, but not directly off short-circuit current, if necessary, to rely on its high-voltage fuse in series to achieve.
6, air circuit breaker (auto switch): a manual (or electric) closing, closing position with the lock to keep from tripping mechanism acting on the trip and has a low voltage switching arc devices, now widely below for 500V AC and DC devices, occurred when the circuit overload, short circuit, voltage drop or disappear, can automatically cut off the circuit.
7, cable: the wire (conductive part), plus a layer of insulation and protection of the three parts of the wires called cables.
8, bus: Bus is the collection and distribution of electrical power in the channel device, which determines the number of distribution installations and equipment and to indicate in what way to connect the generators, transformers and lines, and how to complete the input connected to the system distribution tasks.
9, Current Transformer: also known as the Instrument converter is a high current into a small current to the instrument.
10, Transformers: a static electrical equipment, is used to a certain value of the AC voltage into a frequency of one or more of the same value of the other AC voltage of different devices.
11, high-voltage electric pen testing: high-voltage network to check power distribution equipment, overhead lines, cables are live instruments.
12, ground line: is to have power failure in the equipment and line voltage unexpectedly important tool to ensure staff. By ministerial regulations, the grounding line must be more than 25mm 2 soft bare copper wire.
13, badges: to warn people not to approach equipment and live parts, instructions to staff to prepare the work site, remind to take safety measures, and the trace of a prohibited device or pass a certain line is energized closing signs. Warning can be divided into classes, permitted, and prohibited in other tips.
14, cover the field: the staff do not intend to prevent some of the hit live equipment installed equipment, screen protection, sub-column temporary shelter and permanent cover two columns.
15, insulated rod: also known that g rod, insulated rod, operating rod and so on. Bar by working head insulated, insulated rod and handle three parts. It is for use in closed or open high-voltage isolation switch position, Assembly and Disassembly portable ground wire, and measuring and test use.
16, step voltage: If the distance is 0.8m on the ground level there is the potential difference between two points, when the body contact with the two feet, then the body will withstand voltage, this voltage is referred to as step voltage . Maximum step voltage grounding in the ground from the horizontal distance of 0.8m between the Department and the grounding.
17, phase sequence: that is the order of the phase is the instantaneous value of alternating current changes from negative to positive values through zero-order sequence.
18, power grid: electric power network is part of the system, it is by various types of substations (by) and a variety of different voltage levels of transmission and distribution lines join together to form a unified network.
19, power systems: electric power system is a dynamic part of the system, which consists of power plant generators and power distribution equipment, boost and buck substations, transmission and distribution lines and electrical equipment composed of the user.
20, power systems: power plants, substations and electrical equipment users, the white heat of electricity networks and network (or water) system is called dynamic linking of the overall system.
Second, fill in the blank
1, safe working procedures are specified in: Device-to-ground voltages above 250V for high voltage; in the following low-voltage 250V; safe voltage is 36V below; safe current of 10mA or less.
2, need to be removed because of work on duty cover field work, the required safety distance is 10k V when the 0.7 m, 35k V when the 1.0 m, 110k V when the 1.5 m, 220k V when the 3.0 m.
3, a lightning storm need to visit the outdoor high-voltage equipment, wear insulated boots, and not close to the lightning arrester, lightning rod and grounding devices.
4, in case of fire in electrical equipment should be immediately cut off power to the device, and then put out the fire.
5, a common tool on duty operating a cutting pliers, screwdriver, electric knives, live wrench, needle nose pliers, soldering iron and low-voltage Shidian Bi and so on.
6, graphical symbols in the transformer coil in the three-phase star connection Y said.
7, Substation (the) control room signals are generally divided into voltage signal; current signal; resistance signal.
8, prohibited the use of the electric tape around the unit, line ruler, metal ruler and carry out survey work.
9, live equipment should be used dry powder fire, 1211, carbon dioxide fire extinguishers, fire fighting foam may not be used.
10, Substation (the) batteries commonly used in DC power supply, rectifier, capacitor discharge.
11, Substation (the) emergency lighting must be an independent power supply, lighting circuits can not be mixed with common access.
12, high voltage circuit breaker or disconnect switch operation of the term should be pulling together opened, closed.
13, relay protection and automatic devices operating the term of investment should be put into solution, removed.
14, examine the electrical ground wire assembly and disassembly is the installation of the operating terms, removal.
15, each operation can only fill out an operation task of votes, each operating one, make a mark \
16, the operation has been executed tickets marked \Void operation should be marked \Both Operation Save at least three months.
17, the transistor's output characteristics in three areas are the intercept, amplification and saturation regions.
18, in resistance, tolerance, sense of series circuit, only resistance is the consumption of electricity, while the inductor and capacitor is the energy transformation.
19, Substation (the) two switching operation must be implemented, including those who are familiar with the equipment to do guardian.
20, the switching operation in the event of doubt, vote no unauthorized changes to operation until the dispatcher on duty or a duty to the person in charge of reporting, find out after the operation.
21, in the substation (the) operation, do not fill the work with Operation incident handling, pull together a single switch operation, opened grounding switch or remove the whole plant only a ground wire.
22, complete operation order, order of operations to include operational tasks, hair is, the operator, guardians and operating time.
23, high-voltage equipment, ground fault occurs, then place a safe distance from the body: indoor should be greater than 4 m, outdoor should be greater than 8 m.
24, current transformer primary current is determined by the primary circuit of the load current of the decision, it does not change with the secondary circuit impedance, which is the main difference between the transformer works.
25, transformer oil conservator role is to regulate oil, to extend oil life. The volume of oil pillow is generally one-tenth of the total transformer.
26, the transformer internal fault, the gas relay contacts connected signal circuit, the next trip circuit grounding switch.
27, a transformer cooling oil from the cooling, air-cooled oil, strong oil air-cooled and water cooled high.
28, I plant the device rated current, 1000k VA transformer: 57.7 A, J-752A: 52.5 A; J-201 A: 166 A.
29, I plant three rodent accident year, month, and major damage to equipment,,,.
1 should be small and medium-capacity induction motor short circuit protection and overload protection.
5. ground is generally divided into work according to the purpose of grounding, protective grounding, lightning protection earth (or ground over-voltage protection) and anti-static grounding of four.
6. three-phase induction motor drive methods have changed very speed, frequency control, variable speed control of three slip.
8. lightning rod grounding device, buried in the ground, the grounding resistance is usually not more than 10 ohms.
11. electrostatic discharge with corona discharge, brush-shaped discharge, spark discharge, spark discharge which are most at risk.
12. contact and separation is a basic form of static electricity, static electricity grounding conductor is to eliminate the most simple method, which requires grounding resistance of less than 100 ohms.
15. to cut off the power of a run loop, you must first sub-circuit (auto switch), then sub-isolation switch.
16. Frequency control of the pump system, starting after the motor does not turn, we should first check if a signal is given.
Third, non-title
1. Motor starting and full load starting, the starting current and transfer the same. (√)
3. Motor full load at start up time than the time when light-load starting. (√)
4. Rated the same motor, low speed by torque, speed the higher torque will be smaller. (√)
5. Phase induction motor operation fault occurs, often because the fuse is bad or caused by broken fuse. (√)
6. Asynchronous motor powered, soon blown fuse, it may be winding short or ground. (√)
7. With a shake table to check whether the motor phase short circuit. (√)
8. With megger to check whether the motor inter-turn short circuit. (X)
25, the building should be based on its importance, the nature of a thunderstorm, the possibility and consequences of the accident, according to lightning protection requirements into three categories. Answer: (√)
26, the manufacture, use or storage of explosives, gunpowder, primary explosive, explosive substances and other large buildings in an explosion due to sparks and cause an explosion, can cause great damage and personal injury construction materials should be classified as second mine building. Answer :(×)( Note: should be classified as a Class)
27, various types of buildings should be taken to prevent the lightning and lightning cloud-to-wave intrusion measures. Answer: (√)
28, on the third type of ball lightning structures determined by the scope of protection air terminals should be used when the ball radius should be 45 m. Answer :(×)( Note: should be 60 m)
29, the location of substations should be located in potentially explosive environment is above or below, and should not be a fire hazard in the environment is above or underneath, when there is an explosion or fire hazard and the buildings adjacent to the environment should be consistent with existing national standards \Answer: (√)
30, oil-immersed power transformers can fuel the fire resistance rating of two rooms. Answer :(×)( Note: should be one)
31, transformer room, power distribution room, the capacitor room door should open outwards. The door between the adjacent power distribution room, this door should be two-way open. Answer: (√)
32, transformer room, power distribution room, the capacitor room should be set to prevent rain, snow and snakes, mice and small animals from light windows, doors, cable trench, into the interior of the facility. Answer: (√)
33, power distribution control room and the indoor heating devices, can have flanges, threaded fittings and valves. Answer :(×)( Note: There should be flanges, threaded fittings and valves.)
34, electric tools, hand-held power tools should be retrofitted with high-sensitivity action leakage protection. Answer: (√)
35, relative to the corrosive environment, substations, power distribution throughout the year should be established by the direction of the windward side of the minimum frequency. Answer :(×)( Note: minimum frequency should be in the year under the direction of the wind side.)
36, the material is heavier than air flammable explosive gas atmospheres, in a Zone 2 near the substation, indoor substation and control room floor, should be higher than the outdoor ground 0.3m. Answer :(×)( Note: should be higher than the ground outside 0.6m.)
37,10 kV overhead line and the following non-explosive gas across the environment, overhead line and the horizontal distance for explosive gas atmospheres should not be less than the tower height. Answer :(×)( Note: not less than 1.5 times the tower height)
38, the fire hazard within the wood along the ceiling without plaster and wood walls and wood boring laying the top of the electrical lines should be clearly established through steel. Answer: (√)
39, AC 36V nominal voltage easily be touched more than the bare charged body must be set to cover the sheathing or housing, the protection should not be less than IP2X level. Answer :(×)( Note: should be more than nominal voltage AC 25V (rms) ...)
40, work in explosion hazard areas of personnel, should wear anti-static (conductive) footwear, to prevent the body electric, ground should also be equipped with conductive ground. Answer: (√)
n = 60f / p
n: synchronous speed
f: power frequency
p: Motor pole pairs
four multiple choice
1, two of the same rated voltage resistors, connected in series in the circuit, the resistance of the larger resistance (A).
A, heat large B, small heat C, no significant difference
2, switch the multimeter to achieve (A).
A, a variety of measurement type and range of switch B, the current meter connected to the switch
C, connected to the measurement of analyte switch
3, insulated rod in peacetime should be (B).
A, placed on a smooth B, so that they do not touch the ground and walls to prevent moisture deformation of C, on the corner
4, insulated gloves, the test cycle is (B).
A, once a year,
air force one 25th, B, six-monthly C, five months time
5, insulated boots test cycle is (B).
A, once a year, B, six-monthly C, three months
6, the duty need to be removed during the bar or over cover (C).
A, must have a leading presence of B, you must first power
C, must have a guardian present
7, high-pressure equipment inspection duty (A).
A, usually from two to B, attendant can do other work
C, if that problem can be ready to deal with
8, switching operation after the execution, must be (B).
A, save to shift relief B, save for three months C, prolonged preservation
9, accept the switching operation command (A).
A, guardians and the operator must be present, by the guardian to accept
B, as long as the guardian of the scene, the operator may accept
C, by the substation (the) long-accepted
10, DC bus provisions of the positive phase Paints (C).
A, Blue B, White C, sienna
11, grounded neutral provisions relative to paint coating to (A).
A, Black B, Violet C, White
12, Substation (the) device connector and clamp the maximum allowable temperature (A).
A, 85 ℃ B, 90 ℃ C, 95 ℃
13, current transformer maximum allowable temperature of the skin (B).
A, 60 ℃ B, 75 ℃ C, 80 ℃
14, shall not overload power cables running in accident cases, 10k V cable allows only the following continuous (C) operation.
A, 1 h overload 35% B, 1.5h overload 20% C, 2h overload 15%
15, power transformer oil from (A) role.
A, insulation and arc B, insulation and rust C, insulation and cooling
16, relay device is a (B) formed.
A, the secondary circuit of the component B, various relay
C, including relays and instrumentation loop
17, after the signal relay (C).
A, the relay itself or the lights out card instructions
B, should be immediately connected to lighting and sound loop
C, should be off the side of their brand, while contact closure connected to other signal
18, line protection devices in the circuit failure, partial failure can be quickly and (B).
A, automatic reclosing time B, signal
C, will continue to run some good
19, installation of grounding wire should be (B).
A, taking first in phase B, taking first ground, and then loaded on both sides of the phase
C, first install the line end
20, wearing insulated gloves to operate, should coat sleeve (A).
A, into the insulating gloves B, roll up C, set out in the glove
21, a power line switch maintenance, the line side of the bypass operation, then action should handle the switch on the fly (C) on the lanes.
A, in this work B, against closing C, prohibit climbing, high risk
1. current transformer rated current general provisions for the C
A, 1A
B, 2A
C, 5A
2. a variety of suspension should not be lighting the distance from the ground less than D m.
A, 1.4
B, 2
C, 2.2
D, 2.5
3. into the tank lights low voltage operation should not exceed D.
A, 42V
B, 36V
C, 24V
D, 12V
4. The ground equipment grounding wire is connected to ground lines should be used B.
A, in series
B, parallel
C, then mixed mode
5. of electric shock rescue personnel, external cardiac compression method number of times per minute, the action should not be less than C.
A, 12 times
B, 20 times
C, 60 times
D, 120 times
6. constant torque load at the rated three-phase asynchronous motor is running,
nike air force ones, if the supply voltage down, the motor temperature will be B.
A, lower
B, increased
C, the same
D, perhaps
7. Typically, the human body, is generally safe current value of A.
A, less than 10mA
B, is less than 50mA
C, less than 200mA
8. Clamp ammeter ammeter compared with the general C.
A, measurement error is small
B, measurement error as
C, the measurement error larger
9. measuring the insulation of electrical equipment shop is available when the state C.
A, multimeter X10K file
B, 250V megger
C, 500V megger
10. a model YB160M-4WF motor, the following statements is correct A.
A, motor heights 160mm
B, electrical power is 160KW
C, motor power 4KW
D, 4-pole motor pole number, the fan inside special
11. Motor metal shell and the grounding device for electrical connection is called C.
A,
nike air force one low, work ground
B, protect access to zero
C, protection of ground
D, the work then zero
14. Thermal protection relay is not available in C.
A, single-phase disconnection protection
B, overload protection
C, short circuit protection
15. plastic end cap ceramic knife can be used not frequently operate below capacity in the A
Motors .
A, 3KW
B, 4KW
C, 5.5KW
D, 7.5KW
1, when a current flows underground in the next place, the current in the next generation the soil around the site voltage down. Take place in around the feet is called the voltage between (A).
A: step voltage B: step potential C: threshold voltage D: fault voltage
2, (D) of the power frequency current can be deadly shock people .
A: Number of Security B: Number of mA C: hundreds of milliamperes D: tens of milliamperes
3, when the device leakage occurs when the shell hit, the body caused by exposure to metal equipment, electrical shock known as ( B).
A: direct contact with the shock B: indirect contact electric shock C: static shock D: Non-contact electric shock
4, from the point of view to prevent electric shock, insulation, screen protection and spacing is to prevent the ( D) the security measures.
A: EMF damage B: indirect contact electric shock C: static shock D: direct contact with the shock
5, the electrical equipment not normally live in the protection of metal parts and the zero-line network connection, said for (B).
A: Protection of Ground B: protect access to zero C: Working ground D: work then zero
6, protect access to zero is (C) system.
A: IT B: TT C: TN D: Three-phase three-wire
7, line lamp voltage shall not exceed (A) V, in particular good wet places or conductive ground, if the narrow place of work (such as boilers, metal containers), the disabled, the line lamp voltage shall not exceed (A) V.
A: 36; 12 B: 50; 42 C: 110; 36 D: 50; 36
8, then to zero in the implementation of protection systems, the zero line of work that the center line, usually ( ;) said; protect the zero line of the protective conductor, usually () said. If a line is zero line of work is protecting the zero line, then use () said.
A: N; PEN; PE B: PE; N; PEN C: N; PE; PEN D: PEN; N; PE Answer: C
9, leakage protection device is mainly used in (A, D).
A: Prevention of personal electric shock B: interrupt the power supply to prevent the C: to reduce line losses D: to prevent the leakage fire
10, the installation of lightning rod, lightning conductor, lightning network, lightning protection zone are ( ; B) of the major initiatives.
A: lightning invasion wave B: cloud-to-C: back D: secondary discharge
11, (A) a variety of power distribution equipment lightning invasion wave of the main measures .
A: using (valve type) arrester B: use a lightning rod C: use of lightning with D: by lightning network
12, under normal circumstances, the body resistance can be (B ) for consideration.
A: 50 ~ 100Ω B: 800 ~ 1000Ω C: 100 ~ 500 kΩ D: 1 ~ 5 MΩ
13, (C) electrical device is able to withstand internal explosion of an explosive mixture will not be damaged, and through the shell or structure of any combination of surface holes, internal explosion without causing an explosion outside an explosive mixture of electrical equipment.
A: Increased safety type B: intrinsically safe C: explosion-proof D: filled type
14, leakage protection at its rated residual operating current (B) were a high sensitivity type.
A: 30mA ~ 1A B: 30mA, and the following C: 1A above D: 1A the following
15, when the electrical insulation or insulation is not easy enough to ensure safety should be taken to screen protection measures. Transformation and distribution equipment to maintain a good screen protection device, the height of the bar with the cover not less than (B).
A: 1.4m B: 1.7m C: 2.0m D: 2.4m
16, in order to ensure the formation of fault conditions in the loop fault current, thus providing automatic cutting conditions, the use of protective conductors is (B),.
A: Allow Interrupt B: not allowed to interrupt C: allows access to switching equipment D: automatically cut
17, the following can be used as security in the power supply is (C, D).
A: auto-transformer B: divider C: Battery D: Safety isolating transformers
18, symbol \
A: basic insulation B: double insulation C: Functional insulation D: Shielding
19, overhead lines should not cross (A).
A: combustion material for the roof of the building B: Roads C: navigable rivers D: cable
20, in the following insulated safety tools, security tools are supporting is (C ;).
A: insulated rod B: Insulation baffle C: insulated boots D: insulation clamp
21, with safety extra low voltage (D) measures.
A: the only direct contact with electric shock protection B: only indirect contact shock protection C: to prevent an explosion of fire danger D: both direct contact and indirect contact electric shock protection
22, in the building the power line into the line of the PE lines, ground lines, water mains, the total gas pipes, heating and air conditioning, etc. standpipe connected, preferably also be able to buildings and other metal pipes, metal components are connected. This measure is called (B).
A: Overload B: the main equipotential bonding C: non-conductive environment D: supplementary equipotential bonding
23, when the level of the gas explosion danger area or an area belonging to 0, and the minimum ignition energy for fuel In (A) below, the staff should wear uniforms without risk of electrostatic ignition. When the relative humidity maintained at 50% or more, you can wear cotton clothes.
A: 0.25mJ B: 0.025mJ C: 0.0025mJ D: 0.00025mJ
24, an explosive mixture of explosive gas atmospheres appear under the frequency and duration, is divided into (A .)
A: 0, Zone 1 and Zone 2 Zone B: 10 Area, 11 Area C: 21 Zone 22 and 23 District D: T1 ~ T6 group
five, quiz questions
how to use wind to generate electricity do?
our lookout mechanical energy into kinetic energy, then the mechanical energy into electrical energy, which is wind power. Need wind power installations, called the wind turbine. The wind turbine rotor can be divided into general (including the rudder), generator and tower of three parts.
how much power the wind can do?
general, the three have used the value of the wind. But from the perspective of economic rationality, the wind speed is greater than 4 meters per second, only suitable for power generation. According to the determination of a 55 kW wind turbine, when the wind speed is 9.5 meters per second, the unit's output power is 55 kW; when the wind speed of 8 meters per second, the power of 38 kW; wind speed of 6 meters per second, only 16 kW; and 5 meters per second wind speed, only 9.5 kilowatts. Wind can be seen the greater economic benefits are greater.
1. motor starters should pay attention to?
A: ①, starter motor should be checked whether the debris near the impact of its safe operation, etc.;
②, electrical power, if that is not starting or starting the motor speed and abnormal phenomena such as sound, should be immediately shut down, check the reason;
③, starting more than one electric motor, they should be a platform capacity of descending a start, can not start, so that starting current Ambassador tripping over electrical switches;
④, such as technology, equipment, special requirements, must be according to their order, to start. If we must wait for step-down starting running and then switch to the load;
⑤, starter motor should avoid or minimize frequent start times, leaving the motor starting to prevent frequent fever, affect the use of life;
⑥,
air force 1, the best motor starting interval of 15 minutes.
2. motor failure should immediately stop what happened?
A: ①, happened to stop the motor of the personal accident; ②, motor or starter fire, smoke; ③, strongly threatening the motor complete shock; ④, motor carried by mechanical damage; ⑤, bearing heating temperature rise over high; ⑥, motor abnormal noise while the rapid rise in the temperature dropped significantly and so the motor speed.
3. new motor put into normal operation after starting to pay attention to what before?
A: The new motor starting, it should be idle for some time, during this period should be noted that bearing temperature rise can not exceed the maximum allowable value, there is no unusual attention should be paid to listen to the noise, vibration, to see whether the local heat, such as the load current is over rated, and only in the absence of any unusual circumstances, the motor can be put into normal operation.
4. how to maintain three-phase motor?
A ①, should be kept clean, does not allow water droplets,
air force 1 shoes, oil or dust falling into the motor interior;
②, always check the bearing heating, oil spills, etc.;
③, to observe and check the motor load current, its value should not exceed the motor rating;
④, the motor's insulation levels and types, check the motor temperature rise of ministries;
⑤, when found in the motor running in screaming, grinding sound or other noises, should be immediately shut down for maintenance, troubleshooting before it can continue to be run;
⑥, should be well ventilated to ensure that the motor air inlet and outlet obstruction;
⑦, run the motor if the voltage is lower than the rated voltage for 5% or less, should be appropriately reduced load.
31001, I plant model is the # 1 generator, # 2 Generator # 3 Generator model is a model .
A: TQC5466/2-6000; QF-K6-2; OF-7-2
31002, for the same power system side by side the same conditions the same as the same.
A: The phase sequence; phase; voltage; cycle
31003, voltage transformer secondary circuit may not be current transformer secondary circuit.
A: The short circuit; open
31004, I plant the # 3 rated capacity of main transformer model for the rated voltage.
A: SF9-10000/35; 10000KVA; 38.5/10.5KV
31005, the generator rated power factor equal to the rated power and rated power ratio.
A: Active; apparent
31006, the internal operation of the transformer filled with oil, oil's role is the role and function.
A: insulated; cooling
31007, voltage transformer rated voltage is generally the secondary V, two current transformer is generally constant current capital contributions A.
A: 100; 5
31008, is the use of circuit breakers: when normal or circuit, failure, fault current automatically when needed to automatically play a role in both the control and protection.
A: ON; break; cut; coincidence
31009, over-voltage can be divided according to the cause over-voltage and over voltage.
A: Internal; external
31010, fuse in the circuit protection to protect the two main effects.
A: The overload; short
31011, in the high-pressure equipment should comply with regulations?
A: ① filled with the work sheet or oral, phone order
② at least two people work together.
③ complete assurance cents organizational measures and technological security measures.
31012, work permits human security responsibilities?
A: ① responsible for the review of the votes listed in the security measures are correct, complete, compliance with site conditions.
② layout of the work site safety measures are improved.
③ responsible for checking the power equipment with or without the risk of sudden call.
④ vote as listed in the work place is very small even if the question must also be asked to clear the work ticket issuer, if necessary, additional detail should be required.
31013, what power system?
A: power supply, power grid and the user is called the composition of the overall power system.
31014, wrong co-isolation switch, should I do?
A: The wrong isolating switch, even if combined together wrong, even when in the closing arc, but also not be allowed to pull, isolating switch should take immediate measures, the operating circuit breakers cut off the load.
31015, what is the switch free trip?
A: If the switch is in the process of closing the loop is connected to a short circuit fault protection action turned out gate circuit can reliably disconnect switch, called a free trip.
31016, why the current transformer secondary grounded?
A: The current transformer secondary grounded within a protected ground, to prevent a dielectric breakdown, the second string into the high pressure, threats to personal safety, damage to equipment.
31017, why not use the isolating switch on and off the circuit's load current and short circuit current?
A: Because there is no isolation switch interrupter device, it can not use the isolating switch is turned off the load current and short circuit current.
31018, the motor stops running in the order?
'
Why?
What is the reason?
少年盗窃成瘾作案后留条索要q币(图)
Linear Mode
