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Siemens 3AD8 Operating Instructions Manual page 43

Remote control unit
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The RCU must be mounted on the power pole within 20m of the switchgear it is to connect with. Best
radio connection between RCU and switchgear is when the RCU is under the power lines with a line
of sight to the switchgear. The worst orientation is when the RCU is on the power pole at right angles
to the line. If there are communications problems between the RCU and the switchgear then try
moving the RCU through 90
Also, the RCU should be mounted on the shady side of the power pole to minimise solar heating
which strongly affects battery life. In the Northern hemisphere this means on the North side of the
pole. In the Southern Hemisphere this means on the South side of the pole. If this is impracticable
then the RCU should be mounted towards the Eastern side of the pole to minimise afternoon sun
heating.
5.6.2 Solar Panel Orientation
The solar panel should be mounted as follows:
On the same pole as the RCU within 2 m vertically of the RCU.
Facing South in the Northern Hemisphere and North in the Southern Hemisphere.
With no shading of the panel except within 1 hour of sunrise and sunset. This is vital to ensure
correct operation of the solar panel. Any shadow that falls over any part of the panel significantly
degrades the panel output. If this condition cannot be met then the site is probably not suitable
for solar operation.
Where possible avoid mounting the panel in the line of sight between the RCU and the switchgear
to reduce interference with the RCU radio communications.
5.6.3 Hierarchy of Constraints
When the above orientation recommendations are not possible or incompatible the following is the
recommended hierarchy of constraints:
1
Achieve appropriate location of solar panel to generate acceptable charging. Suggested
tolerance +/-30
2
Position the RCU to achieve reliable communications to switchgear. Ideally the RCU
should be mounted the same side of the pole as the switchgear being careful to avoid
interference from the solar panel above.
3
Position RCU on shaded side of pole as much as possible maintaining point 2 to a
tolerance of +/- 45
Figures 20-23 demonstrate the preferred location of RCU and solar panel for various line orientations
(Southern Hemisphere example).
KMS-0021
2022-02-10
O
(degrees) on the pole.
from north facing (for Southern hemisphere installations)
O
O
of co-linear with the overhead line.
43

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