Technology Trends On August 4, Nanjing Nanrui Jibao Electric Co., Ltd. independently developed a flexible optical current transformer in Yunnan Datang Guanyinyan Hydropower Station and Jiangsu Guoxin Jianbi Power Station stable operation. The successful operation of these two projects marks the first time that this type of current transformer has been implemented in large hydropower and thermal power unit projects.
Transformer is an essential component of the power system, its core role is to measure current or voltage, to provide accurate primary current and voltage measurement values ​​for secondary protection and control equipment. Measurement accuracy, transient characteristics, stability and anti-jamming performance are important indicators to measure the merits of transformers. With the increase of the voltage level of the power system and the continuous increase of the transmission capacity, the disadvantages of the traditional current transformers gradually become prominent, such as the difficulty of insulation, easy saturation, poor transient performance, and large volume.
According to Shen Quanrong, vice president of NARI Electric Research Institute, in order to overcome the various drawbacks of traditional transformers and ensure the safe and stable operation of the power grid, NARI succeeded in developing a flexible optical current transformer after years of technical research. The core equipment of this type of transformer adopts an all-optical structure, which can accurately transmit the DC component, the fundamental component and the higher harmonics. One coil can measure hundreds of thousands of Ampere currents, and the instantaneous error of the transient current is reduced to less than 10%, effectively improving the Harmonic control accuracy and anti-electromagnetic interference capability are suitable for popularization and application in large-scale thermal power, nuclear power, gas, hydropower and other industries. It is also suitable for rapid troubleshooting and positioning of underground cables in large cities.
In order to overcome the problems of small unit space, large volume and heavy weight of transformers, NARI is making full use of the soft and flexible characteristics of the sensing fiber, making the sensing ring into the form of fiber optic cable, and can be installed in any shape conductor. Around the weight reduction of more than 90%, with the advantages of flexible installation, easy maintenance, and strong adaptability. At the same time, the sensing fiber ring can be installed without removing the original primary circuit in the station, which facilitates the temporary or permanent increase of measurement points in the system. It can even be installed while the substation is in operation, without power interruption of the measured line, especially suitable for substation transformation. , power plants and other applications.
It is understood that the optical current transformer has been recognized by the industry as the most promising new type of current transformer. After many years of hard work, Nanrui Insurer has formed a complete series of PCS-9250 optical current transformers, covering voltages ranging from 66 kV to 800 kV, covering pillar type, GIS type, sleeve type, flexible type, etc. This kind of installation method has more than 500 sets of stable operation in smart substations.
Transformer is an essential component of the power system, its core role is to measure current or voltage, to provide accurate primary current and voltage measurement values ​​for secondary protection and control equipment. Measurement accuracy, transient characteristics, stability and anti-jamming performance are important indicators to measure the merits of transformers. With the increase of the voltage level of the power system and the continuous increase of the transmission capacity, the disadvantages of the traditional current transformers gradually become prominent, such as the difficulty of insulation, easy saturation, poor transient performance, and large volume.
According to Shen Quanrong, vice president of NARI Electric Research Institute, in order to overcome the various drawbacks of traditional transformers and ensure the safe and stable operation of the power grid, NARI succeeded in developing a flexible optical current transformer after years of technical research. The core equipment of this type of transformer adopts an all-optical structure, which can accurately transmit the DC component, the fundamental component and the higher harmonics. One coil can measure hundreds of thousands of Ampere currents, and the instantaneous error of the transient current is reduced to less than 10%, effectively improving the Harmonic control accuracy and anti-electromagnetic interference capability are suitable for popularization and application in large-scale thermal power, nuclear power, gas, hydropower and other industries. It is also suitable for rapid troubleshooting and positioning of underground cables in large cities.
In order to overcome the problems of small unit space, large volume and heavy weight of transformers, NARI is making full use of the soft and flexible characteristics of the sensing fiber, making the sensing ring into the form of fiber optic cable, and can be installed in any shape conductor. Around the weight reduction of more than 90%, with the advantages of flexible installation, easy maintenance, and strong adaptability. At the same time, the sensing fiber ring can be installed without removing the original primary circuit in the station, which facilitates the temporary or permanent increase of measurement points in the system. It can even be installed while the substation is in operation, without power interruption of the measured line, especially suitable for substation transformation. , power plants and other applications.
It is understood that the optical current transformer has been recognized by the industry as the most promising new type of current transformer. After many years of hard work, Nanrui Insurer has formed a complete series of PCS-9250 optical current transformers, covering voltages ranging from 66 kV to 800 kV, covering pillar type, GIS type, sleeve type, flexible type, etc. This kind of installation method has more than 500 sets of stable operation in smart substations.
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