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Transformer Monitoring Bushing Monitoring IEEE C57 Dissolved Gas Analysis The only specialist company in bushing monitoring with 40 years in business and over 5000 installations Underground distribution transformer monitor Turnkey installation is our specialty American Company All hardware is made in USA with lifetime warranty ZTZ Services, International was formed by Zalya Berler in 1993 with a focus on on-line monitoring for substation and generating station equipment.We Partial Discharge Testing, Bushings, Insulating Oil, Reliability, Transformer monitoring, Transformer monitoring