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

The tap changer operating handle shall be equipped with a protective cover. The flange at the handle shall be well sealed with no oil leakage. Locking screws shall securely fasten both the handle and the drive mechanism, and the handle rotation shall be smooth without binding. The position indicator on the handle shall be clear, accurate, and consistent with the tap voltage regulation range of the winding. Limit stops shall be provided at both extreme positions. The insulating cylinder of the t

Overhaul Items for Transformer Conservator:1. Ordinary-Type Conservator Remove the end covers on both sides of the conservator, clean rust and oil deposits from inner and outer surfaces, then apply insulating varnish to the inner wall and paint to the outer wall; Clean components such as the dirt collector, oil level gauge, and oil plug; Check that the connecting pipe between the explosion-proof device and the conservator is unobstructed; Replace all sealing gaskets to ensure good sealing with n

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

0 Introduction Dissolved gas analysis (DGA) in insulating oil is a crucial test for large oil-immersed power transformers. By employing gas chromatography, it is possible to timely detect the aging or changes in internal insulation oil of oil-filled electrical equipment, identify potential faults such as overheating or electrical discharges at an early stage, and accurately assess the severity, type, and development trend of the fault. Gas chromatography has become an essential method for monito