Popular Transformer Testing Services are those that provide comprehensive, reliable, and professional diagnostic procedures to ensure the safety and efficiency of transformers. These services are popular because they help clients prevent costly breakdowns, extend the life of their equipment, and maintain compliance with industry standards. Key tests include winding resistance, insulation resistance, and dielectric strength analysis, which check for loose connections, insulation degradation, and oil contamination. Companies that offer a wide range of on-site and laboratory tests, like Faultcode and RTRC Limited in the Gurugram area, are highly sought after. Their popularity is further boosted by their use of modern testing equipment, issuance of detailed reports, and ability to provide a complete picture of a transformer's overall health, allowing for proactive maintenance and informed decisions.