Fibra Optica

Class I
Item no.: 951471.R4
2009-10-01


VestasOnline®

Fibre Cable Handling and Installation





































Vestas Wind Systems A/S · Alsvej 21 · 8940 Randers SV · Denmark · www.vestas.com

Table of Contents

1 Installation practices........................................................................................................... 3
2 Labelling ............................................................................................................................... 4
3 Optical fibre cabletypes...................................................................................................... 4
4 Optical loss in fibre components........................................................................................ 5
5 Connectors........................................................................................................................... 5
6 Inspection and testing......................................................................................................... 6
7 Calculating power budget and fibre distances .................................................................. 7
8 Definitions ............................................................................................................................ 8Vestas Wind Systems A/S · Alsvej 21 · 8940 Randers SV · Denmark · www.vestas.com


1 Installation practices

Instructions in the data sheet from the producer of the cable should always be followed. The data sheet informs you about minimum bending radius, tensile strength and temperatureconditions, etc.

Buried cables must be put in cable conduits. To ease repair or replacement in case of a breakdown it is recommended to pull the cables into tubes appropriate for the fibre cable type used (buried cable-type, as delivered from Vestas, needs large tubes – not blow-tubes).

It is a requirement that fibre cables must always be at least 20 meterslonger than the actual distance between cable termination points. The reason for this excessive length is that in case of a break, you will be able to pull some of the surplus fibre out to the place where the fault occurred. In the wind turbines, the excessive length is also required to ensure that the fibre cable can be routed in a safe and correct manner from the bottom of the turbines to theturbine controller cabinet, and to ensure that there is enough cable for splicing and mounting of connectors.

The following is to be considered when working with the cable:

1. Observe the minimum bending radius specified for your cable at all times

2. Avoid cable twists at all times. Observe this when taking the cable off thecable drum

3. When pulling, only pull by the central strength member

4. Avoid equipment and work surfaces with sharp edges or snag points which may damage the cable

5. Make sure the pulley is designed and adjusted so that stress does not exceed the specified maximum tension when pulling

6. Trenchdepth should be no less than 60 cm (2‟) except under roads,
where a minimum depth of 90 cm (3‟) applies

7. In rocky soil, a fine sand bed must be provided in the cable trench and the cable must be covered with a layer of fine sand

8. The cable is tolerant of neighbouring high-voltage cables

9. A...