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Oil-Immersed Transformers: Mature Technology for Large-Capacity Power Transmission

2026-02-06

Oil-immersed transformers are a widely applied and technically mature type of transformer in power systems. Their core characteristic is that windings and cores are fully immersed in specialized insulating oil and sealed within a robust oil tank. Boasting excellent insulation and heat dissipation performance, they serve as the core equipment for large-capacity, high-voltage power transmission....

Box-type Substation: A Compact "Mobile Substation"

2026-02-05

Box-type substation, also known as prefabricated substation, is a compact integrated power distribution assembly. It integrates core power distribution equipment—including high-voltage switchgear, distribution transformers, low-voltage switchgear, electric energy metering devices, and reactive power compensation units—into one or more enclosed enclosures following a predetermined wiring scheme....

Dry-Type Transformer: Oil-Free Safety for Diverse Applications

2026-02-04

Dry-type transformers are transformers in which the core and windings are not immersed in insulating liquid. With the core advantages of being oil-free, fire-resistant and eco-friendly, they have become indispensable and important equipment in modern power distribution systems. Their main insulation media are solid materials such as air and epoxy resin, eliminating the risks of fire and leakage associated with oil-immersed transformers....

High and Low Voltage Switchgear: Control and Protection for Power Distribution Systems

2026-02-03

High and low voltage switchgear are integrated power distribution assemblies that house electrical components—including high and low voltage circuit breakers, disconnectors, fuses, instrument transformers, busbars, and other elements—within metal enclosures based on specified wiring schemes. Classified by voltage level, they are divided into high voltage switchgear (3 kV and above) and low voltage switchgear (380 V/220 V), serving as critical equipment for connecting, disconnecting, controlling, and protecting electric power in distribution systems....

Coordination and Selection Principles of Power Distribution Equipment

2026-02-02

Dry-type transformers, oil-immersed transformers, high and low voltage switchgear, box-type substations, and power distribution boxes do not operate independently. Instead, they form a well-hierarchized and coordinated integrated system within the power distribution network. High-voltage power from the grid passes through high-voltage switchgear into transformers (or the built-in transformers in box-type substations) for voltage reduction. It is then distributed via low-voltage switchgear and finally delivered to various end-use electrical equipment through power distribution boxes, realizing the full-process power transmission from the grid to end users....

Distribution Box: The "Last Mile" of Terminal Power Consumption

2026-01-30

The distribution box serves as the terminal distribution equipment in power distribution systems, primarily used for the final distribution, control and protection of low-voltage electric power. It is directly connected to various types of end-use electrical equipment, making it a common power distribution facility in residential buildings, commercial structures and factory workshops. By application scenario, it can be classified into lighting distribution boxes, power distribution boxes, metering distribution boxes and other types....

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