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

Rural power grids are characterized by numerous nodes, wide coverage, and long transmission lines. Meanwhile, the electrical load in rural areas shows strong seasonality. These features lead to high line losses on 10 kV rural feeders, and during peak load periods, the voltage at the end of the line drops too low, causing user equipment to malfunction.Currently, there are three common voltage regulation methods for rural power grids: Upgrading the power grid ：Requires substantial investment. Adju

1.1 Voltage Qualification Rate ImprovementHigh - voltage single - phase distribution transformers overcome traditional low - voltage distribution drawbacks like line losses, boosting power supply reliability.Low - voltage distribution causes up to 35% voltage drop, disrupting supply. Switching to high - voltage single - phase transformers limits drops to ≤7%, preventing low - voltage issues at user ends. Stable voltage ensures proper appliance operation.1.2 Power Supply Reliability Enhanc

Introduce the 10 kV line to the load center. Following “small capacity, dense points, short radius”, adopt the new single - phase distribution mode, featuring notable low - voltage line loss reduction, high power quality, and reliability. By comparing the economy and reliability of single - phase vs three - phase transformers in different scenarios, this paper analyzes their applicable scope and application suggestions.Single - phase transformers are classified by distributio

1 Technical Features of Single - phase TransformersFrom the operation practice of foreign distribution networks, it is known that single - phase transformers are quite widely applied. Compared with three - phase transformers, they have unique advantages, which are specifically reflected as follows:1.1 Simple StructureThis characteristic makes that, when using the same materials, for single - phase transformers with the same capacity, their no - load losses are lower than those of three - phase t

1. Safety Hazards in Substation Operation1.1Transformer FailuresTransformers are critical substation equipment and maintenance focal points. Loose/defective components often cause malfunctions, while internal damage (e.g., oil tank impurities/water/bubbles) triggers partial discharge, risking major losses during outages.1.2 Overvoltage RisksOutdoor overvoltage threatens equipment. Lightning-induced impulse currents alter transformer electromagnetic energy, and circuit breaker misoperations cause

In the reconstruction and expansion of modern urban power grids, to optimize the power supply layout, it is required that high - voltage directly enters urban areas, medium - voltage penetrates deep into load centers to shorten the low - voltage power supply radius, and underground cable laying is mostly adopted for urban main roads. Electrical equipment needs to meet the requirements of intelligence, miniaturization, high reliability and aesthetics. The compact substation is widely used in urba

I. Design Principles of Pad-mounted TransformersWith the upgrading of power infrastructure, pad-mounted transformers are widely used in various scenarios due to their light weight, small size, low loss, low noise and high reliability. Studies show that when the power supply voltage is increased from 380V to 10kV, line loss is reduced by 60%, and copper consumption and investment are each reduced by 52%, with remarkable economic and social benefits. As a product of modern economic and social deve

In recent years, driven by policies and the enabling environment, the domestic new energy industry has achieved rapid development. A large number of photovoltaic (PV) projects have been introduced into the power market, and high-altitude PV projects are among them. If prefabricated cabin substations can be utilized scientifically and rationally, high-altitude PV projects can feature short construction cycles, quick commissioning, and relatively low investment levels. This is of great significanc

The economic development demands higher efficiency in substation construction, giving rise to prefabricated cabin substation technology. With modular design, equipment wiring, commissioning, and prefabrication are completed in factories, requiring only "building-block" assembly on-site. Take the 10kV prefabricated high-voltage room as an example: equipment and cabin are installed in the factory, with on-site work limited to busbar and cabin assembly. The main transformer incoming line connects v

With the development of the national economy and society, the requirements for the quality and craftsmanship of power grid projects have become increasingly stringent. The need to improve the construction progress and quality of substations has created opportunities for the promotion of prefabricated cabin - type intelligent substations. The traditional on - site wiring and commissioning of secondary substation equipment involve a large amount of work. Moreover, on - site construction has to wai