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Overhead line sag observation and inspection operation
Release time:
2022-02-14
The role of arc: in the circuit design, the vertical value of the arc can be strictly calculated to ensure a sufficient safe distance to the ground and the cross, and to ensure the circuit stress within the allowable range. During construction, the observation arc vertical can be calculated according to the designed arc vertical value, and strict observation and inspection can be carried out to ensure the construction quality and the safe operation of the circuit.
The role of arc: in the circuit design, the vertical value of the arc can be strictly calculated to ensure a sufficient safe distance to the ground and the cross, and to ensure the circuit stress within the allowable range. During construction, the observation arc vertical can be calculated according to the designed arc vertical value, and strict observation and inspection can be carried out to ensure the construction quality and the safe operation of the circuit.
Concept of Overhead Line Deflection
The concept of arc vertical
In short, slack is the degree of slack in the overhead line behind the rack line. Taking into account the thermal expansion and cold contraction, the overhead line cannot be a straight line, representing arcs of different sizes. This circular arc is an indication of the degree of slack, so the degree of slack is also referred to as circular arc (F).
TYPICAL ARC VERTICAL TYPE
Contour condition
At the same height as the overhead line suspension points A, B, the arc vertical F is located exactly at the midpoint.
The overhead line is not high.
If the overhead line is not high, there are two arcs.
In general, arc perpendicular refers to the perpendicular distance F perpendicular to the midpoint of the tangent line A1B1 and AB of the over-the-top line arc created by two parallel suspension points A, B (also called midpoint arc perpendicular).
Operating Regulations for Arc Vertical Observation
1. The vertical temperature of the observation arc is based on the average air temperature of each observation file and the tight-line operating tower.
2. Measure the temperature with a lead thermometer, and hang the lead thermometer at the same position as the tower selection and the average height of the lead. The rod-shaped thermometer is placed inside the wire segment of the extracted steel core longer than it is, suspended in the sun.
3. After dropping the line, make the observation document number perpendicular to the second interview, make records and fill in the arc vertical observation record form.
Technical principle
Basic Principles of Selection of Observation Archives
The basic principle is that in the tight line engineering, the stress and arc vertical changes within the visceral segment of the sensitive response are representative. At the same time, the key line files should be observed. The selection of observation documents is related to the number of documents, distance and height difference of suspension points in the construction section.
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Yincun Economic Development Zone, Renqiu City, Cangzhou City, Hebei Province