Power stations all use three-phase generators, which emit three-phase alternating current. The electricity emitted by each three-phase generator has three phases A, B and C, and one phase N (neutral wire). ), the neutral wire is generally not exported. There are five wires visible on the high voltage tower. The first two are lightning protection wires and the last three are the three-phase live wires A, B and C.
There is a time difference in the current flowing in each wire, it It is therefore not necessary to have six wires to provide energy. Instead, only three windings are connected in some way inside the generator to use three or. four wires for power. The alternating current emitted by each winding of the generator is called one phase of the three-phase alternating current, which is the single-phase alternating current used.
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Issues that need to be paid attention to in transmission lines
1, Path selection
< p>Path selection and study are the key to the entire line design. The rationality of the plan plays an important role in economic and technical indicators as well as in the conditions of construction and operation of the line. .2. Selection of poles and towers
Different types of poles and towers are different in terms of cost, land use, construction, transportation and operational safety. for about 10% of the entire project, 30% to 40%. Reasonable selection of tower type is the key.
3. Foundation design
As an important part of the transmission line structure, the tower foundation accounts for a large part of the entire line project in terms of cost, construction period construction and handof work. consumption. The construction period accounts for about half of the total construction period, the transportation volume accounts for about 60% of the entire project, and the cost accounts for about 20% to 35% of the entire project. The quality of foundation selection, design, and construction directly affects the construction of the line project.
Baidu Encyclopedia-Transmission lines
Baidu Encyclopedia-Three-phase electricity