1.Common Faults and Diagnostic Measures1.1 Transformer Oil Leakage1.1.1 Oil Leakage from Tank Weld SeamsFor oil leakage at flat joints, direct welding is applicable. For leakage at corners or joints reinforced with stiffeners, the exact leakage point is often difficult to locate, and re-leakage may occur after welding due to internal stress. For such cases, repair welding with an added iron plate is recommended: for two-surface joints, the iron plate can be cut into a spindle shape for welding;

During transformer operation, the core and the metallic structures and components that secure the core and windings are exposed to a strong electric field, inducing a high potential relative to ground. If the core is left ungrounded, a potential difference can develop between the core and grounded parts such as clamps and the tank, leading to intermittent discharges. Additionally, the magnetic field surrounding the windings induces varying electromotive forces (EMF) in different metallic compone

Many beginners in circuit design may find standard resistor values puzzling. Why are common values like 4.7 kΩ or 5.1 kΩ instead of round numbers such as 5 kΩ?The reason lies in the use of an exponential distribution system for resistor values, standardized by the International Electrotechnical Commission (IEC). This system defines a series of preferred values, including the E3, E6, E12, E24, E48, E96, and E192 series.For example:The E6 series uses a ratio of approximately 10^(

Currently, the company operates two electric arc furnace (EAF) transformers. The secondary voltage ranges from 121 V to 260 V, with a rated current of 504 A / 12,213 A. The high-voltage side has a total of eight tap positions, utilizing motor-driven off-circuit voltage regulation. The equipment is equipped with a reactor of corresponding capacity, connected in series to designated taps on the high-voltage side. These transformers have been in operation for over 20 years. Throughout this period,

Amorphous alloy transformers, developed in the 1970s, represent a new generation of power transformers that utilize amorphous alloys as the core material instead of conventional silicon steel sheets. Compared to silicon steel-core transformers, they reduce no-load losses by approximately 70%–80% and no-load current by about 85%. These transformers are currently among the most energy-efficient distribution transformers available, making them ideal for applications in areas with low load uti

Prior to the 1960s, dry-type transformers primarily employed Class B insulation in open-ventilated designs, with the product model designated as SG. At that time, foil windings were not yet available, so low-voltage coils were typically constructed using multi-strand conductors in layered or spiral configurations, while high-voltage coils adopted a disc-type design. The conductors used were either double glass-fiber-wrapped wires or single glass-fiber-wrapped wires with alkyd enamel coating.Most