Indicates the current path composed of various components, devices, and devices.
2. What is the low voltage line?
It is responsible for the distribution of electric power overhead lines or cable lines, and the voltage is less than 1KV. Typical is a 220V/380V power line.
3. What is a low voltage electrical appliance?
It is used for rated voltage AC 1000V or DC 1500V and below, in the circuit consisting of power supply system and electrical equipment, etc. to protect, control, regulate, convert and turn on and off.
4. What is a low-voltage complete set?
It is a complete set of low-voltage switchgear and control appliances.
5. Which two types of low-voltage complete sets are included?
Electronic control equipment; two types of power distribution equipment (or power distribution equipment)
6. What is a power distribution device?
Refers to a variety of equipment for power, distribution and lighting in low-voltage distribution systems in power plants, substations and factories and mines.
7. What are the working steps when the power distribution and power failure work?
Disconnect the power supply, check the power, install the temporary grounding wire, hang the signboard, and install the barrier.
8. What are the main components of low voltage primary equipment?
There are mainly low-voltage fuses; low-voltage knife switches ; low-pressure knife fuse switches and load switches ; low-voltage circuit breakers .
9. What are the main functions of the low voltage fuse?
Mainly to achieve short-circuit protection of low-voltage distribution systems, and some can also achieve overload protection.
10. What are the main functions of the low pressure knife switch?
No load operation, used as a disconnector .
11. What are the main functions of the low-pressure knife fuse switch and load switch?
The low-pressure knife fuse switch has the dual function of a knife switch and a fuse. The main function of the load switch can effectively cut off the load current and provide short-circuit protection.
12. What are the main functions of the low voltage circuit breaker?
It can not only load and unload the circuit, but also automatically trip in short circuit, overload and voltage loss.
13. What is a clearance?
The shortest distance between the two adjacent conductors with a potential difference in the appliance.
14. What is the role of the circuit breaker arc shield?
(1) The arc is guided longitudinally to prevent the occurrence of phase-to-phase short circuit; (2) the arc is brought into contact with the insulating wall of the arc extinguishing chamber, thereby rapidly cooling, increasing the de-free action, increasing the arc-column pressure drop, and forcing the arc to extinguish.
15. Why do shunt compensation capacitors be used in industrial and mining enterprises?
Parallel compensation capacitors are used to compensate the reactive power required by the inductive load of the power system to achieve: (1) Improve the grid voltage quality. (2) Improve the power factor. (3) Reduce line loss. (4) Improve the output of transformers and lines.
16. What is electrical safety? What aspects does it include?
Electrical safety refers to the quality of electrical products, as well as no accidents during installation, use, and maintenance, such as personal death, equipment damage, electrical fires, electrical explosions, etc. Electrical safety includes both personal safety and equipment safety. Personal safety refers to the personal safety of electricians and other participating workers; equipment safety refers to the safety of electrical equipment and its ancillary equipment and facilities.
17. What are the commonly used arc extinguishing methods?
Commonly used arc extinguishing methods are: speed pull arc extinguishing method, cooling arc extinguishing method, arc arc extinguishing method, long arc cutting short arc extinguishing method, narrow groove or slit arc extinguishing method, vacuum arc extinguishing method and sulfur hexafluoride Arc extinguishing method.
18. What is the meaning of low-voltage switchgear and control equipment (referred to as complete sets of equipment)?
One or more low-voltage switchgear and related control, measurement, signal, protection, regulation and other equipment, the manufacturer is responsible for all internal electrical and mechanical connections, a complete assembly with structural components Combination.
19. What is the meaning of the main circuit and auxiliary circuit in the complete set of equipment?
The main circuit is all the conductive loops that carry electrical energy; all the control, measurement, signal and regulation loops outside the main loop of the auxiliary circuit
20. What standards should the low voltage distribution cabinet design meet?
IEC4391 (Low-voltage switchgear and control equipment), GB7251 (Low-voltage switchgear), ZBK36001 (Low-voltage withdrawable switchgear)
21. What is the main circuit?
A conductive component on a circuit used to transfer electrical energy in a complete set of equipment.
22. What is an auxiliary circuit?
In the complete set of equipment (except the main circuit) for all conductive parts on the circuit such as control, measurement, signal and regulation, data processing.
23. What is the level of protection?
Prevents the human body from accessing the live parts or the outer casing, the partition that touches the moving parts, and the degree of protection that should be provided to prevent solid objects from entering the equipment.
24. What is the meaning of working grounding?
Working ground refers to the connection of some equipment in the power system to the earth metal directly or through arc suppression coils, reactors, resistors, etc.
25. What is the meaning of protection grounding?
Protective grounding is to connect the metal casing of the electrical equipment to the grounding body.
26. What is the rated insulation voltage?
The standard voltage value used to measure the dielectric strength, clearance and creepage distance of different potential parts of appliances and their components under specified conditions.
27. What are the safety of the power distribution cabinet?
Voltage pass rate, power supply reliability.
28. What are the main functions of the circuit breaker?
It can turn on, carry and disconnect the current under normal circuit conditions, and can also be connected to and carry a certain time and breaking current under the specified abnormal circuit.
29. How is the phase sequence of the busbar specified?
When arranged from left to right, the left side is phase A, the middle is phase B, and the right side is phase C.
When arranged from top to bottom, the upper side is the A phase, the middle is the B phase, and the lower side is the C phase.
When it is arranged from far to near, it is far from phase A, with phase B in the middle, and nearly phase C.
30. How is the phase color coloring of the busbar specified?
A phase yellow, B phase green, C phase red, PE black, PEN yellow green alternate color, positive - ochre, negative - blue.
The device has a high voltage above ground (250V) and a low voltage below (250V).
31. What is overcurrent protection?
When a short circuit occurs, one of the important features is that the current in the line increases sharply. When the current flows through a predetermined value, the protection device that acts in response to the increase in current is called overcurrent protection.
32. What is the safety distance?
The minimum distance that must be maintained between a person and a charged body to prevent electric shock and short-circuit accidents, between the charged body and the ground and other objects.
33. What is protection and zero?
The protection system of the metal casing of the electrical equipment connected to the working neutral line is called zero-connection protection.
34. What is feedback?
A part or all of the input power (voltage or current) is sent back to its input and the input signal is used to participate in the control output. This effect is called feedback.
35. What is a switchgear?
Mainly used for power generation, transmission, distribution, and electrical energy conversion related switchgear and the combination of control, detection, protection and regulation equipment associated with these switchgear.
36. What is a control device?
Mainly used to control the switching devices of powered devices and the combination of control, detection, protection and regulating devices associated with these switching devices.
37. What is a disconnector?
Isolating switch is a kind of switching device mainly used for "isolated power supply, switching operation, to connect and cut off small current circuits" without arc extinguishing function. When the isolating switch is in the position, there is an insulation distance and an obvious disconnection mark between the contacts in accordance with the specified requirements; in the combined position, it can carry the current under the normal loop condition and under abnormal conditions (such as short circuit) within a specified time. Current switching device. Generally used as a high-voltage isolating switch, that is, an isolating switch with a rated voltage of 1kV or more. Its working principle and structure are relatively simple, but due to the large amount of use and high reliability requirements, the design, establishment and operation of substations and power plants are The impact of safe operation is large. The main feature of the isolating switch is that it has no arc extinguishing capability, and can only divide and close the circuit without load current. The terms introduce the functions, features, types, applications, anti-error improvement, maintenance, and common problems of the isolating switch.
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