Transformers are essential devices that utilize electromagnetic mutual induction to change voltage, current, and impedance. Their primary functions include voltage transformation, current conversion, impedance adjustment, electrical isolation, and voltage regulation (as seen in magnetic saturation transformers).
Commonly used transformers can be categorized as follows:
**1. By Cooling Method:**
**(a) Dry-type Transformers:** These transformers rely on air convection for cooling, either naturally or with added fans. They are typically used in smaller applications like high-rise buildings, highway toll booths, localized lighting systems, and electronic circuits.
**(b) Oil-immersed Transformers:** These transformers use oil as a cooling medium and come in various types such as oil-immersed self-cooling, oil-immersed air-cooling, oil-immersed water-cooling, and forced oil circulation.
**2. By Winding Configuration:**
**(a) Two-winding Transformers:** These are designed to connect two different voltage levels within a power system.
**(b) Three-winding Transformers:** These are commonly used in regional substations of power systems to connect three distinct voltage levels.
**(c) Auto-transformers:** These are used to link different voltage levels in power systems. Additionally, they can function as step-up or step-down transformers under normal conditions.
**3. By Core Structure:**
**(a) Core-type Transformers:** These are typically used for high-voltage applications in power transformers.
**(b) Amorphous Alloy Transformers:** Utilizing an amorphous alloy core, these transformers represent a newer type of magnetic material. They reduce no-load currents by approximately 80%, making them highly energy-efficient. They are particularly well-suited for rural power grids and developing areas where load rates are low.
**(c) Shell-type Transformers:** Designed for high-current applications like electric furnaces or welding transformers, these are also found in power transformers for electronics equipment, including TVs, radios, and more. For instance, the Hongzhi-box transformer from Shanghai falls into this category.
In recent years, new transformer terminal blocks have gained significant attention in global electrical and electronic engineering industries. These terminal blocks are specifically designed for large transformers, featuring a structural design that allows for easy wiring. The screw connections are robust and can be quickly and conveniently mounted onto a 2X10mm rail. The product adheres to international standards such as IEC 60947-7-1, ensuring compatibility and reliability across diverse applications. This innovation not only enhances efficiency but also improves safety and ease of installation, making it a preferred choice for modern electrical systems worldwide.
Spherical lens can make parallel rays of light form one focal point.
A spherical lens has two surfaces, both of which are spherical surfaces, or one surface is spherical and the other surface is flat.
Spherical lens is widely used on microscopy to laser processing, such as in the life sciences, imaging, industrial, defense, and telecom industries.
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