Global Combined Instrument Transformers Market By Type (By Dielectric Medium , Liquid Dielectric , SF6 Gas Dielectric , Specialty Transformers , By Voltage , Distribution Voltage , Sub-Transmission Voltage , High Voltage Transmission , Extra High Voltage transmission , and Ultra-High Voltage Transmission), By Application (Power Utilities , Power Generation , Railways and Metros , and Others), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029