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

Power transformers are core primary equipment in power systems that realize electrical energy transmission and voltage conversion. Through the principle of electromagnetic induction, they convert AC power of one voltage level to another or multiple voltage levels. In the transmission and distribution process, they play a critical role in "step-up transmission and step-down distribution," while in energy storage systems, they perform voltage step-up and step-down functions, ensuring efficient pow

Overview of Grounding TransformersA grounding transformer, commonly referred to as a "grounding transformer" or simply "grounding unit," can be classified into oil-immersed and dry-type based on the insulating medium, and into three-phase and single-phase based on the number of phases. The primary function of a grounding transformer is to provide an artificial neutral point for power systems whose transformers or generators lack a natural neutral (e.g., delta-connected systems). This artificial

I. Overall SituationOverall, State Grid Corporation of China (SGCC) and China Southern Power Grid (CSG) currently maintain a pragmatic stance toward solid-state transformers (SSTs)—actively supporting R&D while prioritizing pilot demonstrations. Both grid companies are advancing SST feasibility through technology research and demonstration projects, laying the groundwork for potential large-scale deployment in the future. Project State Grid (and Affiliated Units) China Southern Powe

Solid-State Transformers (SST): The Future of Intelligent Power ConversionA solid-state transformer (SST), also known as a power electronic transformer (PET), is a static power conversion device that integrates power electronics, high-frequency transformation, and advanced control systems based on electromagnetic induction. It enables the conversion of electrical energy from one set of voltage, current, and frequency characteristics to another—while offering active control, bidirectional power f

Solid-State Transformers (SST): Enabling Intelligent, Efficient, and Flexible Power SystemsThe solid-state transformer (SST), also known as an Electronic Power Transformer (EPT), is a static power conversion device that integrates power electronic circuitry with high-frequency energy transfer based on electromagnetic induction. It enables the transformation of electrical energy from one set of voltage, current, and frequency characteristics to another—while offering far greater control and funct

Solid State Transformer (SST)A Solid State Transformer (SST) is a power conversion device that uses modern power electronics technology and semiconductor devices to achieve voltage transformation and energy transfer.Key Differences from Conventional Transformers Different Operating Principles Conventional Transformer: Based on electromagnetic induction. It changes voltage through electromagnetic coupling between primary and secondary windings via an iron core. This is essentially a direct "mag

1.Rectifier Transformer: Principle and OverviewA rectifier transformer is a specialized transformer designed to supply rectifier systems. Its working principle is the same as that of a conventional transformer — it operates based on electromagnetic induction and is used to transform alternating voltage. A typical transformer has two electrically isolated windings — primary and secondary — wound around a common iron core.When the primary winding is connected to an AC power source, alternating cur

Medium-voltage DC (MVDC) transformers have a wide range of applications in modern industry and power systems. The following are some key application areas for MVDC transformers: Power Systems: MVDC transformers are commonly used in high-voltage direct current (HVDC) transmission systems to convert high-voltage AC into medium-voltage DC, enabling efficient long-distance power transmission. They also contribute to grid stability control and power quality improvement. Industrial Applications: In in

Technical Requirements and Development Trends for Distribution Transformers Low losses, especially low no-load losses; highlighting energy-saving performance. Low noise, particularly during no-load operation, to meet environmental protection standards. Fully sealed designto prevent transformer oil from contacting external air, enabling maintenance-free operation. Integrated protection devices within the tank, achieving miniaturization; reducing transformer size for easier on-site installation. C

Vegetable Oil in High-Voltage Power Transformers: Current Status, Technical Challenges, and Market OutlookNatural ester (vegetable) oil is gaining traction as a sustainable alternative to mineral oil in power transformers. Thanks to its biodegradability, high fire point (>300°C), and extended insulation life, vegetable oil transformers are increasingly deployed worldwide—especially in environmentally sensitive or fire-risk areas.As of 2025, over 2 million vegetable oil-filled transformers are