1; Which part of the power system is composed?
Answer: It consists of a power plant, a transmission and distribution line, a power distribution station and a user unit.
2; What is the power grid?
Answer: The three parts of power transmission, power transformation and power distribution in the power system are called power grids.
3; Advantages of large power systems?
answer:
1) Improved power supply reliability
2) Reduce the spare capacity of the system
3) By distributing the load reasonably
4) Improve the quality of power supply
5) Form a large power system to facilitate the use of large-scale power resources, especially to fully utilize the role of hydropower plants.
4; characteristics of electricity production?
(1) Simultaneity (2) Concentration (3) Applicability (4) Preemptiveness "The above is the addition part"
Exam sample one, single-choice multiple-choice questions (only one is best suited to the question)
1; power network consists of (A)
A. Power transmission, substation, power distribution B. Power generation, power transmission, substation
2; the use of electricity tends to be reasonable (B)
A. Peak and valley load difference is larger B. Peak and valley load difference is smaller
3; The voltage is too low, which will cause the asynchronous motor (C).
A. Vibration B. Insulation damage C. Burned down
4; When short circuited, the short circuit is characterized by (C).
A. High voltage B. Small current C. Large current
5; The closing current of the circuit breaker refers to (C) passing through the circuit breaker contacts.
A. Normal current B. Load current C. Maximum short-circuit current allowed to be turned on.
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Super five line identification is "CAT5E", bandwidth 100M, is the mainstream product;The identification of the six lines is "CAT6", with a bandwidth of 250M, used to set up gigabit network, which is the trend of future development.
The "UTP" method refers to the UTP -- Unshielded Twisted Pair cable, which consists of several pairs of Twisted Pair and one plastic sheath.CAT5E of twisted pair also use 4 winding pairs and 1 anti-tension wire, the color of the pair is exactly the same as the CAT6 of twisted pair, namely white orange, orange, white green, green, white blue, blue, white brown and brown respectively.
Although the CAT5E of unshielded twisted pairs can provide up to 1000Mb/s of transmission bandwidth, they often need to be supported by expensive special equipment.Therefore, it is usually only used for 100Mb/s fast Ethernet to connect desktop switches to computers.If you are not prepared to upgrade your network to gigabit Ethernet in the future, then you might as well use CAT5E of unshielded twisted pair in horizontal wiring.
CAT6 of unshielded twisted pair: all parameters of the six classes of unshielded twisted pair have been greatly improved and the bandwidth has been extended to 250MHz.The CAT6 of twisted pair are different from the CAT5 or CAT5E types of twisted pair in shape and structure, which not only increases the insulated cross skeleton, but also places the four pairs of twisted pair wires in the four grooves of the cross skeleton, and the diameter of the cable is also thicker.
In addition to the traditional voice system still use three types of twisted pair, network cabling is basically using CAT5E or CAT6 of unshielded twisted pair Ethernet cable.
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