High demands on cellular networks-High demands on Surge Protective Devices

摘要

The continuous utilisability of transmitting/receiving systems and switching centres is for mobile communications a particular importance. These influence the domain of private telecommunication directly by customer satisfaction, in the domain of professional mobile radio (PMR; e.g. public safety organisations), the continuous availability is in the foreground. Good radio prerequisites are necessary for the construction on exposed sites, like for example on elevations, tower buildings and on towers or poles. With increased expansion and due to the high danger potential lightning protection and thus over voltage protection is becoming more relevant for cost-intensive engineering and the demand for permanent availability of the network operation are making Surge Protective Devices (SPD) indispensable. The performance of such SPD has to fulfil the highest requirements. For use in cellular networks a lot of different mechanical and physical requirements are in demand. A combination of class I arresters, based on spark gap technology and class II arresters, based on MOV technology realise a protective device which combine a high absorption of energy and a fast response. This paper describes the requirements, which has to be fulfilled to realise an effective internal lightning protection system.