Praktisk guide vid skydd av industrianläggning och dess apparater mot överström

Sammanfattning: A safe and stable power supply in an industrial plant is of utmost importance today. However, errors in an industrial power grid will always occur, and when they do, a fault current will be generated. If these are not detected and isolated quickly, there is a risk of large costs and damage to both material and personnel. A well-functioning protection system against overcurrent is therefore of utmost importance to industrial customers. To protect against over currents, a protection system with correctly implemented protection functions is required. One of Siemens AB's many business areas is protection systems where they provide products and services to their customers. Based on the complexity of a protection system, Siemens AB sees an advantage in having a guide available for both their customers and sellers, that explains in a simple and comprehensive way how to protect an industrial plant against the overcurrents. After extensive literature studies regarding protection systems, overcurrent and relay protection, relevant information and theory have been processed and compiled. Documents for how a guide should be written have been studied and provided inspiration for the work. The result of this was a practical guide for protecting industrial plants and its components against overcurrent. The guide goes through the underlying protection philosophy for how the power system in an industrial plant should be protected, theoretical review of overcurrent and relevant relay protection functions, as well as practical examples of how typical industrial components can be protected against overcurrent. The guide was accepted by the company and will thus be available to Siemens personnel and costumers for deeper understanding in the field.