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Basics of Overhead Line Design
Release time:
2022-03-02
Basic Points of 1. Overhead Line Design
Basic Points of 1. Overhead Line Design
1. Power system configuration
The production, transportation, distribution and use of electricity constitute a system called the power system, which includes power stations, power grids, and users.
(1) Power station
(2) Substation
(3) Power grid
2. Overhead line power system power voltage level
At present, China's commonly used AC pressure level: 220v, 380v, 6.3kv, 10kv, 20kv, 35kV, 66kV, 110kV, 220kV, 330kV, 500kV, 750kV
Power voltage grade classification 1: safe power voltage (usually not exceeding 36V2: low voltage (divided into 220V and 380V);3: high voltage (1kV-220kV);4: ultra-high voltage 330kV-750kV;5: high voltage 1000 kV alternating current, above 800KV DC.
3. Classification of overhead lines
Classified by power pressure level
Power transmission lines, high-voltage overhead power lines that transmit power from the power grid to power plants are called power transmission lines, and the power voltage level is generally above 35kV. Under the management system of the State Grid Corporation, lines below 35kV are generally called power distribution lines, which are the key to undertake power distribution tasks. 110-220kV lines are called high-voltage power transmission lines, and there are 66kV high-voltage 330-750 in northeast China.
Classification by structure
(1) Overhead transmission line.
(2) cable lines, cable lines can be divided into overhead cable lines and underground cable lines.
Classification according to power characteristics
(1) AC power transmission line
(2) DC power transmission line
Quickly identify lines for each power voltage level
For composite insulation, a distinction is made according to the length of the insulation.
Structural composition and component classification of overhead lines
The key components of the overhead line are the main line, lightning wire (or overhead ground wire, abbreviated ground wire), gold tools, insulation, tower, foundation, grounding device, etc.
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Yincun Economic Development Zone, Renqiu City, Cangzhou City, Hebei Province