The Furukawa Electric Co., Ltd.
- Maintenance
- Patrolling
Patrolling is being conducted to prevent the OPGW equipment from secondary damage and also to maintain a smooth operation of the equipment by detecting an abnormality in the equipment in its early stage, which is general survey based on the visual inspection of external appearance.
Contents of practice, a method and cycle are correspondingly being executed to the existing overhead ground wire as a basic line, and some new items have been supplemented along with the addition of the function as a fiber optic transmission line.
Table-1 shows the added details being conducted currently as a standard procedure.
Sr. No. |
Patrolling Place |
Cycle |
Method |
Note |
|
Clamp region |
Same as existing ground wires (Approx. 1 year 1 time) |
Visual inspection of external appearance with the naked eye or binocular |
- See if there is any remarkable bent in OPGW
- See if OPGW vibrating
|
|
Jumper region |
|
Wiring region |
Same as above |
Same as above |
- See if all cleats are in positing
|
|
Inserting region of fiber optic joint box |
|
Span region |
Same as above |
Same as above |
- See if there is any core broken in OPGW
- See if a sag of OPGW is normal
- See if a OPGW is vibrating
- See if all dampers and twist prevention weights are in position
|
Table-1 : Details of the patrol as to OPGW and its belongings
Table-3 shows details of the inspection being conducted as a standard procedure.
Sr. No. |
Place to be Inspected |
Cycle |
Method |
Note |
1. |
- Fiber optic transmission line (check the unused cores out of the fiber enclosed)
|
Once in a three years period for instant |
- Measurement of transmission loss between light receiving level and terminal station with a power meter
- Measurement of a loss in connection with a part due to OTDR, and local loss increase in the line
|
- How is the situation of light receiving level against the planned values
- How is the situation of transmission loss against the planned values.
Also if there is a change due to again
|
Table-3 : Details of inspection on the fiber optic transmission system