1 Why must the transformer core be grounded?During normal operation of power transformers, the core must have one reliable ground connection. Without grounding, a floating voltage between the core and ground would cause intermittent breakdown discharge. Single-point grounding eliminates the possibility of floating potential in the core. However, when two or more grounding points exist, uneven potentials between core sections create circulating currents between grounding points, causing multi-poi

Transformer Fault Diagnosis Methods1. Ratio Method for Dissolved Gas AnalysisFor most oil-immersed power transformers, certain combustible gases are produced in the transformer tank under thermal and electrical stress. The combustible gases dissolved in oil can be used to determine the thermal decomposition characteristics of the transformer oil-paper insulation system based on their specific gas content and ratios. This technology was first used for fault diagnosis in oil-immersed transformers.

1. Mechanical Direct Towing of Large Power TransformersWhen large power transformers are transported using mechanical direct towing, the following work shall be properly completed:Investigate the structure, width, gradient, slope, inclination, turning angles, and load-bearing capacity of roads, bridges, culverts, ditches, etc. along the route; reinforce them when necessary.Survey overhead obstacles along the route such as power lines and communication lines.During loading, unloading, and transpo