Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Routine Maintenance and Care of Dry-Type Power TransformersDue to their flame-resistant and self-extinguishing properties, high mechanical strength, and ability to withstand large short-circuit currents, dry-type transformers are easy to operate and maintain. However, under poor ventilation conditions, their heat dissipation performance is inferior to that of oil-immersed transformers. Therefore, the key focus in the operation and maintenance of dry-type transformers is controlling the temperatu

Normal operating sound of a transformer. Although a transformer is static equipment, a slight, continuous "humming" sound can be heard during operation. This sound is an inherent characteristic of operating electrical equipment, commonly known as "noise." A uniform and continuous sound is considered normal; an uneven or intermittent noise is abnormal. Tools such as a stethoscope rod can assist in determining whether the transformer's sound is normal. The causes of this noise are as follows: Vibr

I. Overview of Solid-State Transformers (SST)A Solid-State Transformer (SST) is an advanced power conversion device that integrates power semiconductors, high-frequency transformers, and control circuits.Compared with traditional transformers, SST supports AC/AC, AC/DC, and DC/DC conversions, and features advantages such as bidirectional power flow, intelligent control, and a compact design.Its main topologies include single-stage, two-stage (with LVDC or HVDC links), and three-stage structures,

DG Matrix and Resilient Power say their solid - state transformers can reduce the cost, time, and complexity of supplying power to data centers, electric vehicle (EV) charging hubs, and the like. For decades, electrical engineers have dreamed of a device that can seamlessly connect solar panels, battery systems, and on - site generators to high - power equipment such as EV chargers or data center servers without the need for a large amount of expensive hardware to make them work together.Now, th

1. What is a Solid-State Transformer (SST)?1.1 Fundamentals and Limitations of Conventional TransformersThe article first reviews the history (e.g., Stanley's 1886 patent) and basic principles of conventional transformers. Based on electromagnetic induction, traditional transformers consist of silicon steel cores, copper or aluminum windings, and insulation/cooling systems (mineral oil or dry-type). They operate at fixed frequencies (50/60 Hz or 16⅔ Hz), with fixed voltage transformation ratios,

Operating Conditions for Transformers The installation site must be free from flooding, located at an altitude not exceeding 1,000 meters, and maintained in an ambient temperature not exceeding 40°C. Relative humidity may reach 100% within an operating temperature range of 40°C to -25°C (on-load tap changers and temperature controllers must be rated for -25°C). The installation area should be clean, free from conductive dust and corrosive gases, and equipped with sufficient natural or mechanical

Heidrich Pouring Tank Features a fully integrated online film degassing system for enhanced resin quality. Employs static mixing technology—ensuring contamination-free processing with zero waste. Offers programmable mixing ratios and adjustable pouring speed for precise process control. Achieves an internal vacuum level of 0.8 to 2.5 bar, optimizing resin penetration and impregnation.Horizontal and Vertical Cutting Lines Delivers high-precision machining with a tolerance of ±0.01 mm and burr con

Compared to traditional oil-filled transformers, dry-type transformers offer several advantages. Key benefits of dry-type transformers include:Safety: Dry-type transformers are considered safer as they lack flammable liquid insulation (such as oil). They eliminate risks associated with oil leaks, spills, and related fire hazards. This makes them suitable for indoor installations, especially in areas where fire safety is a priority, such as commercial buildings, hospitals, and schools.Environment

I. Allowable TemperatureWhen a transformer is in operation, its windings and iron core generate copper loss and iron loss. These losses are converted into heat energy, causing the temperature of the transformer's iron core and windings to rise. If the temperature exceeds the allowable value for a long time, the insulation will gradually lose its mechanical elasticity and age.The temperature of each part of the transformer during operation is different: the winding temperature is the highest, fol

Traction Rectifier TransformersRated capacity: 800 to 4400 kVA; Voltage class: 10 kV and 35 kV; Rectifier pulse number: 12-pulse and 24-pulse. Compared with 12-pulse rectifier circuits, 24-pulse rectifier circuits can reduce the harmonic pollution of the power grid by 50%, and no filtering equipment is needed at this location. It is suitable for power supply systems of urban subways and rail transit.Excitation Rectifier TransformersRated capacity: 315 to 3000 × 3 kVA; Voltage class: 10 kV, 13.8