Transformers, also known as instrument transformers, are the collective term for current transformers and voltage transformers. In the field of electric energy meters, we often use current transformers, which can turn large currents into small currents for measurement or system protection. The main function is to convert the large current into a standard small current (5A or 1A, both refer to the rated value) in proportion to realize the standardization and miniaturization of measuring instruments, protection instruments and automatic control instruments.
The principle of current transformer is based on the principle of electromagnetic induction. The current transformer is composed of a closed core and windings. Its primary winding has a few turns, which is stringed in the line of the current that needs to be measured, so it often has all the current of the line flowing, and the secondary winding has more turns, which is connected in series with the measuring instrument and the protection circuit. When the current transformer (CT) is working, its secondary circuit is always closed, so the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to short circuit.
Yongtailong Electronics (YTL) is not only committed to the research and development of electric meters, but also has a certain degree of research on the transformers used therein, and has obtained a variety of invention patents and utility model patents. There are many different types of transformers released, the main products are as follows:
1. Miniature transformer
This type of current transformer is made of advanced super-crystalline materials., whose maximum current can reach 60A, current transformation ratio is 1 (10A)/0.5mA, load resistance is 10 Ohm, it can withstand 4000V AC withstand voltage, and its accuracy level can reach 0.1 level. With the advantage of high accuracy, small size, stable performance, it is widely used in various complex installation environments for electric energy measurement or monitoring.
2. Anti DC component transformer
This type of transformer is molded with epoxy resin, rated current 5A, secondary current 5mA, maximum current up to 120A, load resistance 10Ω, can withstand 3000V AC withstand voltage, accuracy level is 0.1, and has good resistance to DC components. , Anti-DC component error≤±2.8%.
3. Outdoor open-close transformer
This type of transformer uses high-permeability ferrite as the magnetic material, the maximum current can reach 100A, the detectable current is less than 200mA, the current accuracy is class 1.0, the temperature accuracy is ±2°C (temperature range -20~85°C), and with Mod-bus communication function, current and temperature values can be read. With the characteristics of high accuracy, stable performance, small size, convenient installation and no rust at the opening, It is suitable for measuring and monitoring current and temperature. Its opening and closing design structure can be quickly loaded and unloaded under uninterrupted power conditions, which greatly improves construction efficiency.
Zhejiang Yongtailong Electronic Co., Ltd
LinkedIn:Shawn Shen(Smart meter Manufacturer)