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

The solid-state transformer (SST), also known as a power electronic transformer (PET), uses voltage level as a key indicator of its technological maturity and application scenarios. Currently, SSTs have reached voltage levels of 10 kV and 35 kV on the medium-voltage distribution side, while on the high-voltage transmission side, they remain in the stage of laboratory research and prototype validation. The table below clearly illustrates the current status of voltage levels across different appli

1 IntroductionAccording to the provisions of the national standard GB/T 1094.3-2017, the primary purpose of the line terminal AC withstand voltage test (LTAC) for power transformers is to evaluate the AC dielectric strength from the high-voltage winding terminals to ground. It does not serve to assess inter-turn insulation or phase-to-phase insulation.Compared with other insulation tests (such as full lightning impulse LI or switching impulse SI), the LTAC test imposes a relatively more stringen

What Are the Handling Procedures After Transformer Gas (Buchholz) Protection Activation?When the transformer gas (Buchholz) protection device operates, a thorough inspection, careful analysis, and accurate judgment must be carried out immediately, followed by appropriate corrective actions.1. When the Gas Protection Alarm Signal is ActivatedUpon activation of the gas protection alarm, the transformer should be inspected immediately to determine the cause of operation. Check whether it was caused

What is SST?SST stands for Solid-State Transformer, also known as Power Electronic Transformer (PET). From the perspective of power transmission, a typical SST connects to a 10 kV AC grid on the primary side and outputs approximately 800 V DC on the secondary side. The power conversion process generally involves two stages: AC-to-DC and DC-to-DC (step-down). When the output is used for individual equipment or integrated into servers, an additional stage to step down from 800 V to 48 V is require

One of the core challenges of Solid-State Transformers (SST) is that the voltage rating of a single power semiconductor device is far insufficient to directly handle medium-voltage distribution networks (e.g., 10 kV). Addressing this voltage limitation does not rely on a single technology, but rather a "combination approach." The main strategies can be categorized into two types: "internal" (through device-level technological and material innovation) and "external collaboration" (through circuit

Optimized SEO-Friendly Abstract: NVIDIA’s 800V DC Architecture and the Rise of Solid-State Transformers in Next-Gen AI Data CentersOn October 16, 2025, NVIDIA published its landmark white paper, “800 VDC Architecture for Next-Generation AI Infrastructure,” signaling a pivotal shift in power delivery for AI-driven data centers. As large-scale AI models and next-gen CPUs/GPUs push computational demands to unprecedented levels, rack-level power consumption has surged from 10 kW in 2020 to 150 kW in

Current Price Level of SST SystemsCurrently, SST products are in the early stages of development. There is significant variation in solutions and technical routes among both overseas and domestic suppliers. The widely accepted average value per watt is between 4 to 5 RMB. Taking a typical 2.4 MW SST configuration as an example, at 5 RMB per watt, the total system value could reach 8 million to 10 million RMB. This estimate is based on pilot projects in data centers in the U.S. and Europe (such a

Load Banks in Power System Testing: Applications and AdvantagesThe power system is a core infrastructure of modern society, and its stability and reliability directly affect the normal operation of industry, commerce, and daily life. To ensure efficient operation under various operating conditions, load banks—critical testing equipment—are widely used in power system testing and validation. This article explores the application scenarios and unique advantages of load banks in power system testin

The table below covers key decision criteria from requirements to implementation in the core dimensions of solid-state transformer selection, which you can compare item by item. Evaluation Dimension Key Considerations & Selection Criteria Explanation & Recommendations Core Requirements and Scenario Matching Primary Application Objective: Is the goal to achieve extreme efficiency (e.g., AIDC), require high power density (e.g., microgrid), or improve power quality (e.g., s

1. Maintaining and Restoring the Factory Insulation ConditionWhen a transformer undergoes factory acceptance tests, its insulation condition is at its optimal state. Thereafter, the insulation condition tends to deteriorate, and the installation phase may be a critical period for sudden degradation. In extreme cases, the dielectric strength may drop to the point of failure, leading to coil burnout immediately upon energization. Under normal circumstances, poor installation quality leaves behind