Learn the causes, types, and hazards of partial discharge in high-voltage electrical equipment. Discover how air gaps, moisture, insulation defects, and corona discharge damage insulation systems and reduce equipment reliability.

Learn the recommended buried depth of a ground rod, grounding rod spacing requirements, and how grounding depth affects grounding resistance. Discover practical grounding installation tips, soil considerations, and grounding resistance testing methods for safe electrical systems.

Learn the difference between transformer capacity and transformer power, including kVA vs kW, transformer capacity calculation formulas, power factor, and transformer sizing methods. Discover how transformer ratings affect electrical system performance and safety.

Learn the calculation formula of transformer short-circuit impedance and impedance voltage in simple English. Discover how transformer impedance affects voltage drop, short-circuit current, voltage regulation, and power system protection.

Learn about common hydraulic oil testing items including viscosity, moisture, acid value, contamination level, flash point, foaming, wear analysis, and water separability. Understand the importance of hydraulic oil analysis for equipment reliability and preventive maintenance.