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1. what is high voltage switchgear?
high voltage switchgear is a certain wiring scheme will involve one or two a high voltage power distribution assembly of complete sets of equipment assembled in the plant and substation as control and protect the hair electromechanical, power transformers and high-voltage line use. which is equipped with high-voltage switchgear, protective devices, test and measurement instrumentation bus, insulators and the like. high voltage switchgear fixed and withdrawable two categories, usually in small and medium industries in the substation, the vast majority of the use of more economical fixed voltage switchgear. unique handcart switchgear are: high-voltage circuit breakers and other equipment is mounted on the top can be pulled out to promote the handcart. equipment repair inspection, any time between pull and push what kind handcart, will return to power, with checks to facilitate repair and safety, and can greatly reduce outage time off advantage, but the price is high.
2. what is the low-voltage switchgear?
low-voltage switchgear according to certain wiring scheme will be directed to a low-voltage distribution electrical low-voltage switchgear assembly complete assembly of. as power and lighting distribution purposes in the following 1000v power supply system. it also has the same fixed and withdrawable installation install two categories.
3. what is the meter? how does it access to the circuit?
measurement circuit current strength instrument called ammeter, ammeter in series with the circuit under test access to the circuit under test or current transformer secondary circuit connection.
4. what is the voltmeter? it is how the access circuit?
measuring the potential difference between two points in an electric field instrument called voltmeter. nominal voltage of the circuit under test predicate parallel access circuit.
5. what is the meter?
measuring instrument called power meter. it consists of a group or several groups of current loop and voltage loop.
6. what is the clearance?
between phase and phase components, the linear distance between the circuit and the voltage difference between conductor devices and bare live conductors and devices between said clearances.
7. what is the creepage distance?
along the potential difference between the two semiconductor device insulation material appearance shortest distance creepage distance.
8, the short-circuit current?
in a circuit, because impede or bing adjoining causing a short circuit caused by overcurrent.
9. what bus?
one kind can be used with several low-impedance path adjacent conductors.
10, what is the main bus?
adjacent to one or several distribution busbars and (or) incoming and outgoing units bus.
11, what is the line unit?
through which the electrical energy fed into the equipment to other units in a unit of efficacy.
12. what is the outlet unit?
through which the power transmission unit 1 to the proposition efficacy or more outgoing circuits.
13, what is the effectiveness of the unit?
it is the equipment in a department. unified by its complete efficacy of all electrical equipment and mechanical devices form.
14. what is the dielectric strength?
it refers to the device in the main circuit to add a certain waveform and polarity voltage against the highest peak value without causing breakdown of tolerance. the dielectric strength test is to test equipment or a plurality of circuit applying rated combat withstand voltage test, also known as pressure experiments done.
15. what is the insulation resistance?
it is wrapped in complex conductor insulation or its insulating frame must withstand voltage of maximum resistance. check the device circuit can withstand the rated voltage does not leak test the degree of insulation such experiment called the insulation resistance test.
16, what is the grounding assembly? it conceiving which department?
① grounding of electrical equipment and the ground wire to ground all called assembly.
② metal conductor in direct contact with the earth called grounding or grounding.
③ metallic conductors and electrical equipment grounding connection is called grounding wire.
17, the electrical grounding on what is the meaning?
electrical equipment grounding occurs during operation which impede, the current rover will be held to the ground by the grounding. experiments show that through the grounding, the potential is zero, so to say, where are zero by whatever potential grounding. so, upon application of power, human action, control all contact body took place, no matter under what circumstances the potential of zero, applying electricity to reach safety. be grounded main role is to protect the safety of persons and equipment.
18, metal housing and infrastructure which of electrical equipment to hold ground?
1) electrical and mechanical services, transformers, switches, according to the offerings with tools and electrical equipment and base housing.
drive assembly 2) of the electrical equipment, the operating mechanism of the switch knife.
3) distribution panel and the control box, the frame of the cabinet.
4) the secondary coil current, voltage transformer.
