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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.

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