There are various ways to classify transformers, depending on different perspectives. The main criteria for classification include usage, structure, cooling method, etc. The following are common classifications and specific descriptions:
1. Classification by purpose
1. Power transformer: used for voltage transformation and power transmission in the power system, including step-up transformers, step-down transformers, and distribution transformers.
2. Special transformers: Designed for specific scenarios, such as electric furnace transformers, rectifier transformers, test transformers, mining transformers, etc.
3. Instrument transformers: used for measurement and protection, such as current transformers and voltage transformers.
4. Voltage regulating transformer: It achieves voltage adjustment by adjusting the winding turn ratio and is divided into two categories: no-load voltage regulation and on-load voltage regulation.
II. Classification by number of phases
1. Single-phase transformer: It is suitable for single-phase AC circuits and is commonly found in homes and small devices.
2. Three-phase transformer: used in three-phase power systems, it features high efficiency and low loss, and is widely applied in industry and power transmission.
III. Classification by winding form
1. Dual-winding transformer: It connects two voltage levels and is the most common type.
2. Three-winding transformer: connects three voltage levels and is used in regional substations.
3. Autotransformer: It achieves voltage regulation through a common winding and features small size and low cost.
IV. Classification by cooling method
1. Dry-type transformer: It relies on natural air cooling or forced air cooling and is suitable for use in places with high fire and explosion prevention requirements.
2. Oil-immersed transformer: It utilizes transformer oil for heat dissipation and insulation, and is widely used but requires attention to fire prevention.
3. Fluoride-cooled transformer: Utilizing fluoride as the cooling medium, it boasts high heat dissipation efficiency and is suitable for high-capacity scenarios.
V. Classification by core structure
1. Core-type transformer: With a closed-core design, it features a short magnetic circuit and low loss, making it suitable for high-capacity and high-voltage scenarios.
2. Shell-type transformer: The iron core surrounds the winding, forming a compact structure, which is commonly used in high-current equipment (such as electric welding machines).
3. Amorphous alloy transformer: Utilizing novel magnetic conductive materials, it features low no-load loss and is suitable for low-load scenarios such as rural power grids.
VI. Classification by pressure regulating method
1. Off-circuit tap changer transformer: It requires power outage to adjust the voltage and is suitable for infrequent voltage adjustment scenarios.
2. On-load tap changer transformer: capable of regulating voltage while live, suitable for applications requiring dynamic voltage adjustment.
VII. Other classification methods
According to the insulating medium: oil-immersed, dry-type, sulfur hexafluoride insulation, etc.
According to the neutral point insulation level: fully insulated transformers and semi-insulated transformers.
According to conductive materials: copper wire, aluminum wire, and superconducting material transformers.
The above classification integrates the diverse application requirements of transformers in fields such as power systems and industrial equipment. Specific choices need to be made based on actual scenarios and technical parameters.
Shenzhen Shentebian Electrical Equipment Co., Ltd., a wholly-owned subsidiary of Jishengchang Group, was established in 2004 and boasts its own industrial park. It is a professional transformer manufacturing enterprise with advanced technology and robust capabilities.
