Proposed features/Power transmission refinement
| Power transmission refinement | |
|---|---|
| Status: | Draft (under way) |
| Proposed by: | FK270673 |
| Tagging: | power=> power=line, power=minor_line, minor_underground_cable=*, power=underground_cable, voltage=* |
| Applies to: |    transmissiongeneration context and unify tags for power lines.
|
| Definition: | <definition> |
| Rendered as: | Identical to power=generator and power=sub_station |
| Draft start: | 2011-06-16 |
| RFC start: | |
| Vote start: | |
| Vote end: | |
Contents |
Proposal
This proposal aims to clarify the current usage of the power=* key in energy transmission context and deprecates power=minor_line.
Power routes
Bahnpirat suggested to introduce power routes relations.
Unknown voltage
If the voltage of a power line is unknown, Schusch suggested to add low, medium, and high as possible values for Key:voltage.
Deprecating tags
FK270673 suggested to deprecate power=minor_line. If we do so, we would have to deprecate also power=minor_underground_cable. But because power=underground_cable is itself redundant with power=cable, the deprecation strategy would look like :
| Deprecated tag | Used for ? | New tag(s) to use |
|---|---|---|
| power=minor_line | Low voltage line | power=line + voltage=20000 or voltage=medium if exact voltage is unknown (voltage=low if voltage is presumably lower than 1000 V) |
| power=underground_cable | Underground cable | power=cable + location=underground |
| power=underground_cable | Sea cable | power=cable + location=sea |
| power=minor_underground_cable | Low voltage underground cable | power=cable + location=underground + voltage=20000 or voltage=low if exact voltage is unknown |
Classification
All lines with voltages greater than 50 kV should be always marked as "high voltage lines", line with voltages of less than 50 kV as "low voltage lines". This makes Openstreetmap in appearance more similiar to commercial topographic maps, which show in most cases no powerlines with voltages below 50 kV.
Exceptions of this rule
Lines with voltages below 50 kV should be classified as "high voltage lines", if they are installed on towers designed for carrying lines of more than 50 kV. Electrode lines of HVDC schemes should be if the scheme is operated with more than 50 kV, which is true for nearly all HVDC schemes always as "high voltage lines", as these lines belong to a scheme with more than 50 kV operation voltage. For people who do not know what an electrode line of an HVDC scheme is: an electrode line is a line used at a HVDC scheme where ground return is used or provided for the connection of the ground electrode with the inverter. Such lines can be implemented as overhead lines or underground cables and use sometimes a right of way different from that of the main HVDC line. If they are implemented as overhead lines, they look like medium voltage lines, however use 1 or 2 conductors in most cases. As electrode lines run directly to a grounding system, they are in some schemes used as lightning protection wire of the main HVDC line. In this case the electrode line is either fixed with an insulator equipped with a lightning arrestor on the top of the pylon or on a separate crossbar above the HVDC line. The insulation toward the pylon is required in order to prevent its electrochemical corrosion.
Tower not with low voltage line
Do not use the symbol "tower" in combination with "low voltage lines"! Otherwise at certain Zoom-Levels you see towers on the map without conductors, which does not look very nice!
