The TN-S System: Elinination of Disturbances, Monitoring and Localization of Fault Currents

The technically advanced radio and telecommunication equipment of today, with sensitive electronic devices, leads to very high demands on environment free from electric disturbance. A well-functioning TN-S system is an important component is to bee free from disturbance. In a TN-C system, with many loads in single-phase connection, unbalanced loads will result in a zero phase-sequence current causes disturbance due to the fact that it will flow back to the neutral point of the transformer via the different N and PE conductors in a way that is impossible to control. In a TN-S system the zero phase-sequence current must flow in the N conductor. This means that the total current in each cable is always zero. For safe and faultless operation, a TN-S system must be provided with monitoring equipment.