How to measure temperature for dry-type rectifier transformers-INNO

The rail transit system, including subways, large railways, vân vân., requires specialized transformers, including traction transformers, máy biến áp chỉnh lưu, vân vân. The dry-type phase-shifting rectifier transformer is used in conjunction with a high-voltage frequency converter. Hiện nay, large capacity products in China mostly adopt a secondary multiple electromagnetic wire parallel winding method. As the capacity of the transformer increases, the number of parallel wires also increases to meet the temperature rise and loss requirements of the transformer. As the capacity of the transformer increases, the number of wires that need to be connected in parallel will also continue to increase. Due to differences in inductance and heat conduction between parallel wires, dòng điện của pha dây song song sẽ có độ chênh lệch lớn hơn khi số lượng dây song song tăng lên, dẫn đến mất cân bằng độ tăng nhiệt của máy biến áp. Có vùng quá nhiệt trong máy biến áp, ảnh hưởng đến tuổi thọ sử dụng và công suất đầu ra của nó.

Tại sao máy biến áp chỉnh lưu cần phải được làm mát và làm mát

Trong quá trình vận hành, tình hình nóng bức đang nghiêm trọng, và tổn thất của máy biến áp chỉnh lưu dùng để điện phân có thể lên tới 120kw. Các tổn thất đều được chuyển hóa từ điện năng thành nhiệt năng và tiêu tán ra môi trường xung quanh dưới dạng nhiệt năng. Nhiệt độ mùa hè đặc biệt cao, và một lượng nhiệt lớn được thải trực tiếp, sẽ ảnh hưởng đến môi trường xung quanh. Ngoài ra, the high temperature of the rectifier transformer affects its service life, so cooling treatment is needed. During the operation of high-voltage rectifier transformers, một lượng nhiệt lớn được tạo ra. If the heat is not discharged in time, it will cause the internal components of the transformer to burn out, which is prone to faults and seriously affects the service life of the transformer; Thường xuyên, transformers use cooling methods such as fans and ventilation holes. If the ventilation channels are not set properly, resulting in low heat exchange efficiency, it cannot meet the cooling needs of high-voltage rectifier transformers. Especially under long-term operating conditions, high-voltage rectifier transformers are prone to faults, seriously affecting the service life of transformers.

Temperature monitoring of rectifier transformers

With the development of the power system towards ultra-high voltage and large capacity, in order to ensure the safe and stable operation of high-voltage electrical equipment, equipment condition monitoring is particularly important. Equipment temperature is one of the important parameters that reflect the operation status of equipment, so online monitoring of equipment temperature is of great significance. The dry-type phase-shifting rectifier transformer is used in conjunction with a high-voltage frequency converter, and the temperature rise control and cooling system control of the dry-type phase-shifting rectifier transformer coil are key controls to ensure the safe, reliable and continuous operation of the transformer. How to timely, accurately, and truly collect transformer temperature data, and then control the cooling system, is the key to the safe and reliable operation of the entire high-voltage frequency converter system. Hiện tại, the temperature control tube structure of dry-type phase-shifting rectifier transformers has basically not taken into account the impact of high-voltage electromagnetic fields on the sensitivity, tính xác thực, and timeliness of temperature control probe temperature measurement element data acquisition. There is an urgent need to design a new dry-type phase-shifting rectifier transformer to overcome the aforementioned shortcomings of existing dry-type phase-shifting rectifier transformers. Due to the high voltage of the phase-shifting rectifier transformer, the 6KV power frequency withstand voltage is 20KV, and the 10KV power frequency withstand voltage is 28KV. The traditional platinum resistance for temperature measurement cannot meet the withstand voltage requirements. The platinum resistance used for temperature measurement cannot be embedded in the coil and must be protected to prevent voltage breakdown. Thermal imaging or infrared thermometers cannot meet the accuracy requirements for temperature measurement. Vì thế, in response to the existing temperature measurement problems mentioned above, FJINNO provides a phase-shifting rectifier transformer winding fluorescent fiber optic temperature measurement device, which can effectively solve the technical problem of temperature measurement not meeting voltage resistance.

Fiber optic online monitoring device for rectifier transformers

các hệ thống đo nhiệt độ sợi quang huỳnh quang for rectifier transformer winding can directly, thời gian thực, and accurately measure the hot spot temperature of the winding, achieving comprehensive monitoring of the internal of the rectifier transformer and a wide temperature measurement range. Ngoài hiệu suất đo nhiệt độ chính xác và đáng tin cậy, Ngoài ra còn có khả năng chống EMI/RFI tuyệt vời (nhiễu điện từ/nhiễu tần số vô tuyến) đặc trưng, cách điện cao áp, và hiệu suất chống nhiễu. Sự huỳnh quang hệ thống đo nhiệt độ sợi quang consists of a temperature sensing fiber optic probe, a transmission fiber optic, and a fiber optic demodulator. The system has the characteristics of direct, trực tuyến, thời gian thực, and accurate measurement of winding hot spot temperature, and can achieve real-time and accurate monitoring of hot spot temperature during dynamic load operation.