Small-sized Insulating Transformers for a New Grounding System in Telecommunications Center Buildings

Abstract

Insulating transformers in a light, compact unit were developed for providing the best connection to a newly configured grounding system in a telecommunications center building. In the conventional grounding system, telecommunications equipment was tripped by stray DC current and lightning. To solve this problem, a new grounding system was designed with use of insulating transformers. As the specifications of conventional insulating transformers are not sufficient, small-sized insulating transformers were developed. The insulating transformers offer high dielectric strength (more than 50 kV) with low insertion loss (less than 0. 5 dB) in the transmission frequency of 64 kHz to 8 MHz. A dedicated distribution frame was also developed to install the insulating transformers with necessary functions for both jumpering and terminating cables.