Design and Performance Study of a Temperature Compensated ±1100-kV UHVdc All Fiber Current Transformer

Zhao, Jun; Shi, Linjun; Sun, Xiaohan

doi:10.1109/tim.2020.3029364

Cited by 20 publications

(9 citation statements)

References 18 publications

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“…We define the ratio of modulation frequency to eigenfrequency as the frequency ratio m, m = f/f s . ( 9) will be the same as (5) when m equals 1/2.…”

Section: Relationship Between the Length Of Pmf And Sensing Fibermentioning

confidence: 99%

“…However, the cost and the accuracy are the major obstacles. Compared with these temperature compensation schemes, the real-time temperature compensation method by data processing [5] is more attractive. This method does not alter the optical devices and serves the purpose of temperature compensation.…”

mentioning

confidence: 99%

“…However, there also are some drawbacks. Firstly, the temperature sensing and electric current sensing units share the same superluminescent diode (SLD) light source and signal processing module [5]. However, the other optical devices are independent, which is harmful for integration.…”

mentioning

confidence: 99%

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Research on All-Fiber Dual-Modulation Optic Current Sensor Based on Real-Time Temperature Compensation

Zhang

Chen

et al. 2022

IEEE Photonics J.

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We present a method to simultaneously measure the temperature and electric current, which can be applied for the all-fiber optic current sensor (AFOCS) temperature compensation. The Faraday rotation mirror is introduced as the temperature sensing unit based on the all-fiber dual-modulation optic current sensor. The temperature and electric current could be distinguished by the sequence of pulse light received by the photodetector. The working principle of temperature and electric current sensing are analyzed by modeling and simulation. The experiments are designed to confirm the temperature compensation scheme. The relative error of AFOCS decreases from 14% to 2% by temperature compensation, which meets the requirements of micro-current fiber sensing.

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“…We define the ratio of modulation frequency to eigenfrequency as the frequency ratio m, m = f/f s . ( 9) will be the same as (5) when m equals 1/2.…”

Section: Relationship Between the Length Of Pmf And Sensing Fibermentioning

confidence: 99%

mentioning

confidence: 99%

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Research on All-Fiber Dual-Modulation Optic Current Sensor Based on Real-Time Temperature Compensation

Zhang

Chen

et al. 2022

IEEE Photonics J.

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“…AFOCS has many advantages, such as excellent insulation characteristics, simultaneous measurement of AC and DC, flexible sensor diameter, and digital output [2]. It has gradually replaced electromagnetic current transformers in the fields of pulsed current measurement [3], ultra-high voltage electrical network [4], and plasma current measurement [5]. The AFOCS is essential and will play a critical role in the smart grid [6].…”

Section: Introductionmentioning

confidence: 99%

Research on the Dual Modulation of All-Fiber Optic Current Sensor

Zhang

Chen

2022

Sensors

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Acousto-optic modulator (AOM) and electro-optical modulator (EOM) are applied to realize the all-fiber current sensor with a pulsed light source. The pulsed light is realized by amplitude modulation with AOM. The reflected interferometer current sensor is constructed by the mirror and phase modulation with EOM to improve the anti-interference ability. A correlation demodulation algorithm is applied for data processing. The influence of the modulation frequency and duty cycle of AOM on the optical system is determined by modeling and experiment. The duty cycle is the main factor affecting the normalized scale factor of the system. The modulation frequency mainly affects the output amplitude of the correlation demodulation and the system signal-to-noise ratio. The frequency multiplication factor links AOM and EOM, primarily affecting the ratio error. When the frequency multiplication factor is equal to the duty cycle of AOM and it is an integer multiple of 0.1, the ratio error of the system is less than 1.8% and the sensitivity and the resolution of AFOCS are 0.01063 mV/mA and 3 mA, respectively. The measurement range of AFOCS is from 11 mA to 196.62 A, which is excellent enough to meet the practical requirements for microcurrent measurement.

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“…In Hu et al (2019) , the long-term temperature error due to Verdet’s constant was compensated by selecting a suitable initial phase delay of the waveplate in order to optimize the FOCT accuracy, but the waveplate accuracy was difficult to control due to the different absorption coefficients of unusual and unusual light in the waveplate. In Zhao, Shi & Sun (2020) , an optical fibre temperature sensing scheme based on the temperature birefringence effect of the polarisation-preserving fibre (PMF-TS) was proposed, but the structural defects generated inside the fibre during the drawing process of the polarisation-preserving fibre can cause degradation of the polarisation-preserving performance. The existing research on optical current transformers mainly focuses on the abnormal manifestations of optical DC electronic current transformers, and there is a lack of research on the causes of faults and alarm mechanisms because the FOCTs are all foreign imported equipment.…”

Section: Introductionmentioning

confidence: 99%

Abnormal handling mechanism and improvement measures of optical DC current transformer in smart grid environment

Zhou¹,

Tang²,

Pan³

et al. 2022

PeerJ Computer Science

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An optical DC current transformer anomaly handling mechanism is proposed to address the problem that the conventional DC current transformer anomaly handling mechanism cannot compensate for the defect of capacitor anomaly blocking. First, the implementation principle, modulation loop, demodulation method and its anomaly warning mechanism of the sine-wave modulated all-fibre-optic current transformer (FOCT) are investigated, and the effects of light source intensity and modulation voltage on current decoding are explained. The modulation loop is then simulated and modelled and a FOCT anomaly handling mechanism is proposed based on the Bessel function with real-time dynamic current compensation for small changes in modulation depth. Finally, an integrated dynamic test system for DC current transformers and DC protection is designed, and the actual system operation and fault model is established using the RTDS simulation system. The experiments demonstrate that the proposed FOCT anomaly handling and improvement measures can effectively improve the transient performance of FOCT, and at the same time provide a complete set of testing means for the engineering application and later upgrade and replacement of FOCT.

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Design and Performance Study of a Temperature Compensated ±1100-kV UHVdc All Fiber Current Transformer

Cited by 20 publications

References 18 publications

Research on All-Fiber Dual-Modulation Optic Current Sensor Based on Real-Time Temperature Compensation

Research on All-Fiber Dual-Modulation Optic Current Sensor Based on Real-Time Temperature Compensation

Research on the Dual Modulation of All-Fiber Optic Current Sensor

Abnormal handling mechanism and improvement measures of optical DC current transformer in smart grid environment

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