1) Standard type. The standard power transformer series has a capacity of 8~1500va, a small voltage regulation rate, and a temperature rise of only 40°C under full load operation. It allows short-term overload operation and is suitable for high-demand applications. If the primary windings are insulated with Class B (130°C) polyester film, covered with at least three layers of insulating tape, it is capable of withstanding 4000V AC withstand voltage for 1min;

　　2) Economy type. The capacity of the series of economical power transformers is 50~1500va, which reduces the cost on the basis of guaranteed performance. Suitable for continuous operation without overload. The working temperature rise is 60°C, the insulating material grade is Class A (105°C), and the output voltage error is less than 3% at full load.

　　3) Isolated type. The capacity of the isolation transformer series is 50~1000VA, which can be divided into two series: industrial equipment and medical equipment. The isolation transformer focuses on its insulation performance. The primary and secondary are wrapped with at least 4 layers of polyester film in Class B insulation, and the breakdown voltage should be greater than 4000V. All primary leads must be double insulated wire. The maximum temperature rise of the transformer is less than 45°C.

　　Applications of toroidal transformers:

　　1. Audio equipment

　　Toroidal transformers can be used as high-performance products for power transformers in Class 3 high-power hi-fi amplifiers and power transformers for small and medium-power audio equipment. High-quality toroidal transformers can be used in the power range from 6VA to 1000VA.

　　2. Electrical control

　　Such as for current and voltage transformers. High-precision, high-stability transformers made with toroidal transformer technology. New high-performance magnetic materials such as permalloy soft magnetic materials, amorphous materials, or nanocrystalline alloys can be used as magnetic cores, equipped with precise intelligent instruments and special testing methods. It can ensure that the transformer parameters are accurate and the performance is completely consistent.

　　3. Medical equipment

　　Toroidal transformers are specially designed and manufactured for medical equipment. In addition to high efficiency, high reliability, and high safety requirements, it also especially strengthens the electric strength and improves the resistance to heat and humidity. A thermal fuse is also required inside the transformer to ensure reliability.

　　4. Applications in other fields

　　Toroidal transformers can also be used in various power inverters, such as solar and wind power generation systems. This high-efficiency toroidal transformer with a low-loss iron core can greatly improve the overall efficiency of the inverter power supply.