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

H61 Distribution Transformer Selection includes the selection of transformer capacity, model type, and installation location.1.Selection of H61 Distribution Transformer CapacityThe capacity of H61 distribution transformers should be selected based on the current conditions and development trends of the area. If the capacity is too large, it results in the “large horse pulling a small cart” phenomenon—low transformer utilization and increased no-load losses. If the capacity is too small, the tran

Problems with Zero-Sequence Protection of 110 kV TransformersIn an effectively grounded system, the neutral-to-ground displacement voltage of a transformer is limited to a certain level, and the neutral-point gap protection does not operate. The purpose of installing gap protection is to prevent damage to transformer insulation caused by elevated zero-sequence voltage in non-effectively grounded systems. The discharge gap only operates when a single-phase ground fault occurs, all directly ground

Substation grounding transformers require high accuracy, excellent anti-interference performance, high safety performance, reasonable structure, and good long-term stability to meet the requirements of substations for ground resistance measurement. At the same time, demands for communication and information processing capabilities of grounding transformers are also increasing, requiring continuous technological innovation and improvement. There can be many reasons for tripping of substation grou

1. IntroductionA transformer operates based on the principle of electromagnetic induction. The main components of a transformer are the windings and the core. During operation, the windings serve as the path for electric current, while the core serves as the path for magnetic flux. When electrical energy is input to the primary winding, the alternating current creates an alternating magnetic field in the core (i.e., electrical energy is converted into magnetic field energy). Due to magnetic link

Cooling and Insulation of Dry-Type TransformersA dry-type transformer is a special type of power transformer characterized by the fact that its core and windings are not immersed in insulating oil.This raises a question: oil-immersed transformers rely on insulating oil for both cooling and insulation, so how do dry-type transformers achieve cooling and insulation without oil?First, let’s discuss cooling .Dry-type transformerstypically use two cooling methods: Natural air cooling (AN): When opera

Dry-type transformers refer to power transformers in which the core and windings are not immersed in oil. Instead, the coils and core are cast together (typically with epoxy resin) and cooled by either natural air convection or forced-air cooling. As a relatively newer type of power distribution equipment, dry-type transformers have been widely used in power transmission and distribution systems in factory workshops, high-rise buildings, commercial centers, airports, ports, subways, and offshore

The world's first transformer was developed in 1876. It featured a very simple design and used air as its insulation medium. In 1885, engineers in Hungary successfully built the first modern transformer with a closed magnetic circuit and air insulation, marking the beginning of rapid development and widespread application of transformers. Since then, the transformer industry has continuously advanced toward higher voltages and greater capacities.In 1912, the oil-immersed transformer was invented

What Is a Toroidal Transformer?A toroidal transformer is a major type of electronic transformer that has been widely used in household appliances and other electronic equipment with higher technical requirements. Its primary applications are as a power transformer and an isolation transformer. Abroad, toroidal transformers are already available in complete series and are extensively used in computers, medical equipment, telecommunications, instruments, and lighting applications.In China, toroida

Differences Between Rectifier Transformers and Power TransformersRectifier transformers and power transformers both belong to the transformer family, but they differ fundamentally in application and functional characteristics. The transformers commonly seen on utility poles are typically power transformers, while those supplying electrolytic cells or electroplating equipment in factories are usually rectifier transformers. Understanding their differences requires examining three aspects: working

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