HV is a high voltage power system and ideally performs in commercial and industrial power systems. High voltage systems supply large electrical supplies like transformers, substations, testing and commissioning. Nowadays there are a lot of commissioning companies and electrical contractors available on the internet.
A few types of Power Transformers
Turns Ratio (TTR)
Excitation Current
Insulating Oil Tests (Dissolved Gas Analysis (DGA) & Standard Oil Test)
DC Winding Resistance
Vector Group
DC Insulation Resistance
Insulation Power Factor/ Dissipation Factor/ Tan Delta (Tanδ)
Zero Sequence Impedance
Sweep Frequency Response (SFRA)
Primary Through Injection
Transformer Differential Stability
Tap Changer Continuity & Ratio
Calibration of thermal sensors
Standard Oil Test and Dissolved Gas Analysis (DGA)
Ancillary Protection Testing