How to measure temperature of transformer winding-INNO

변압기 권선에 온도 측정이 필요한 이유

변압기 권선의 가장 높은 온도는 안전 여부를 결정하는 주요 요인입니다., 경제적인 운영, 변압기의 수명. 권선의 가장 뜨거운 부분의 절연 구조물의 과열로 인한 노화는 변압기 전체의 손상으로 이어질 수 있습니다.. 따라서 변압기 제조업체와 운영 부서는 변압기 핫스팟의 온도를 긴급하게 모니터링해야 합니다.. 그러므로, IEEE 표준 C57.12.00-2000에는 핫스팟의 온도와 위치를 결정하는 기능이 필요합니다..

전력 변압기는 전력 전송 네트워크에서 가장 중요한 장비 중 하나입니다., 그 성능은 전체 전력망의 안정적인 작동에 매우 중요합니다.. 전력 변압기에서, a portion of the electrical energy is converted into heat generated by the transformer. Although this heat is relatively small compared to the total energy converted by the entire transformer, it can cause a significant temperature rise in the transformer. This thermal effect not only leads to a decrease in the insulation capacity and lifespan of the transformer, but also is a limiting factor for the actual operation of the transformer. 그러므로, studying the temperature field of transformers, especially the hot spot temperature, is of great significance. 잘 알려져 있듯이, the capacity of a transformer is directly proportional to its economic and technical indicators. 그러므로, with the continuous progress of new processes and technologies, the voltage level and individual capacity of power transformers will continue to increase. As the single-phase capacity of transformers gradually increases, the thermal problems in transformers become increasingly urgent to be solved. The overheating of transformer windings not only causes accelerated aging of insulation and affects its service life, but also causes malignant accidents due to local overheating of windings both domestically and internationally. These accidents have caused huge economic losses to industrial production and have had a huge adverse impact on society. So the heating problem of transformers is increasingly attracting the close attention of transformer design and usage departments.

Fiber optic temperature measurement of transformer winding

The thermal design of large transformer windings has always been mainly to calculate the average temperature rise of the transformer winding to the oil. To obtain the hot spot temperature rise of the winding, empirical formulas can only be used to estimate it. With the increasing demand for safe operation of transformers from users, thermal design based on average coil temperature rise can no longer guarantee the reliability of transformers. Due to the aging caused by overheating of the local insulation structure in the hottest part of the winding, it is possible to develop into damage to the entire transformer. 그러므로, 안전, economic operation, and service life of the transformer mainly depend on the hottest temperature of the transformer winding. 그러므로, accurate monitoring of the hot spot temperature of transformer windings has become a guarantee for the safe and economical operation of transformers. The traditional temperature measurement methods for power transformer windings include thermal resistance temperature measurement, 열전대 온도 측정, 적외선 온도 측정. 하지만, the winding is exposed to harsh environments such as high voltage, 고온, and extremely strong electromagnetic interference. Thermistors and thermocouples transmit signals through metal wires and are susceptible to electromagnetic interference. 게다가, metal wires are exposed to insulation oil for a long time and are prone to short circuits after aging. Infrared thermometers cannot be installed inside transformers. 현재, they can only be used to measure the surface of oil tanks and the outer surface of transformers such as bushings, and the measurement results are affected by environmental temperature. 그러므로, there is an urgent need for a new measurement method. 요즘에는, countries around the world are generally shifting their focus to using fiber optic probes to directly measure the temperature of hotspots. Installing a fiber optic thermometer on a transformer does not significantly increase the overall production cost of the transformer, so foreign transformer manufacturers and operating departments widely adopt this technology.