ADSS optical cable distribution is an important issue in optical cable ordering and construction. After the route used in the project has been determined and the path conditions are clear, the next step is to consider the distribution of optical cables and the factors that affect the distribution.
1. Continuation problem
Due to the particularity of the ADSS optical cable, it cannot be connected arbitrarily like ordinary optical cables. The connection must be carried out on the tension tower of the transmission line, and it must not be connected in the air in the middle of the line. Due to its difficult construction conditions and poor outdoor connection location conditions, the number of optical cable connections should be reduced as much as possible. Therefore, the length of each ADSS optical cable should be controlled within the range of 3-5 kilometers. If the plate length is too long, the problem is inconvenient construction. If the plate length is too short, the number of connections will be greater, making the construction more difficult. In addition, a large number of connections increases the circuit loss and affects the transmission quality of the optical cable.
2. The relationship between ADSS optical cable length and lines
ADSS optical cables are suspended on high-voltage transmission lines. The design length of high-voltage transmission lines is one of the main basis for determining the length of ADSS optical cables. In addition, the length of ADSS optical cables should also consider the natural conditions between towers in the transmission lines.
In addition, it is necessary to consider the over-lead and sag on the tower, the length required for optical cable splicing, the length used for traction during construction, etc. Another consideration is the allowable design error of the transmission line; since a 1% error is allowed when designing the transmission line, the 1% error should be considered when selecting the ADSS optical cable. The reference formula is as follows:
Optical cable reel length, transmission line length x coefficient + length considered for construction + length for splicing + line error. Among them, the reasons include sag, overhead lead on the tower, etc.
The sag of the ADSS optical cable should be similar to the conductor sag of the transmission line. The manufacturer should provide all technical parameters. The design should calculate the distance between the maximum sag of the conductor and the maximum sag of the optical cable based on the parameters provided by the manufacturer. Prevent collision, causing damage to the optical cable and affecting normal operation of the line.
3. The design department should propose a preliminary optical cable distribution list based on the line conditions it has mastered, and provide a reference for bidding selection. After the manufacturer is selected, the design unit and the manufacturer will jointly determine the final optical cable distribution. The distribution list should be as detailed as possible.
4. When ordering ADSS optical fiber cables, optical cables of various pitches should be taken into consideration, and the pitch differences should be simplified as much as possible to reduce the types of optical cables. This not only reduces the number of spare parts but also reduces the complexity of construction.