-
Service Item
- I'm Online Chat Now
-
High-voltage variable power distribution system
Release time:2019-09-02 | Source:HUA LI JI DIAN.Variable distribution
The distribution system consists of a power distribution substation (usually a power transmission voltage of the power grid to a power distribution voltage), a high-voltage distribution line (i.e., a voltage of more than 1 kV), a distribution transformer, a low voltage distribution line (below 1 kV) and the corresponding control protection equipment. The distribution voltage usually has 35 to 60 kV and 3 to 10 kV.
Ac power supplyCommon ac power supply methods in power distribution systems are:
Three-phase, three-wire system. It is divided into triangular wiring (for high-voltage distribution, three-phase 220-volt motor and lighting) and star-shaped wiring (for high-voltage distribution, three-phase 380-volt motor).
Three-phase, four-wire system. For 380\/220 volts of low voltage power and lighting hybrid distribution.
Three-phase, two-line, one-ground system. Mostly used in rural distribution.
Three-phase single-line system. Often used for electrical railway traction power supply.
Single-phase two-wire system. The main supply of electricity to residents.
Power system voltage level
The power system has voltage levels of 220\/380V (0.4 kV), 3kV, 6kV, 10kV, 20kV, 35kV, 66kV, 110kV, 220kV, 330kV, 500kV. With the improvement of the motor manufacturing process, 10 kV motors have been mass produced, so 3 kV, 6 kV has been used less, 20 kV, 66 kV is also rarely used. The power supply system is based on 10kV and 35kV. The transmission and distribution system is dominated by more than 110kV. The power plant has a 6kV and 10kV generators, now mainly 10kV, the user is 220\/380V (0.4kV) low-voltage system.
Types of substations
Various voltage levels of the power system are converted by power transformers, and the voltage is increased to a voltage-up transformer (substation is a boost station) and the voltage is reduced to a buck transformer (substation is a buck station). One voltage becomes a two-coil transformer with two coils (windings) and one voltage becomes a three-turn transformer with three coils (windings) for two voltages.
In addition to the point of boost and buck, substations are divided into hub stations, regional stations and terminal stations in size. The hub voltage class is typically three (three-turn transformer), 550kV \/220kV \/110kV. Regional stations also typically have three voltage levels (three-turn transformer), 220kV \/110kV\/35kV or 110kV\/35kV\/10kV. Terminalstations are generally directly received to the user, most of which are 110kV\/10kV or 35 kV\/10kV in two voltage levels (two-turn transformers). The user's own substation sits generally only two voltage levels (two-turn transformer) 110kV \/10kV, 35kV \/0.4kV, 10kV \/0.4kV, of which 10kV \/0.4kV is the most.
Next:NothingRelevant information