Retrofitting a sewage plant with lightning and surge protection
Lightning Protection Guide: DEHN
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The structural conditions of the widespread outdoor wastewater treatment systems, with measuring equipment and control units extending over large areas, additionally increase the risk of interference caused by lightning discharges or surges. Thus, it is most likely that the complete process control system, or parts thereof, will fail if no protection measures are taken. The consequences of such a failure can be serious, ranging from costs for re-establishing the availability of the sewage plant to the unknown costs for eliminating ground water contamination. Consequently, external and internal lightning protection measures must be taken to efficiently eliminate this threat and to increase the availability of the systems.
The example described in the scenario was calculated based on the IEC 62305-2 (EN 62305-2) standard. It should be noted that the procedure described (comprising eight steps) is an example.
- It is likely that the complete process control system on a widespread sewage plant will fail without adequate lightning and surge protection.
- The consequences of such a failure can be serious.
- External and internal lightning protection measures must be taken to eliminate this threat.