Comparative Study on Residual Current Signal Processing Method of AC/DC Sensitive Residual Current Transformer

2012 ◽  
Author(s):  
Can Liu ◽  
Kui Li ◽  
Yao Wang ◽  
Xu Zou ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Signal Processing ◽  
Comparative Study ◽  
Current Transformer ◽  
Processing Method ◽  
Residual Current ◽  
Current Signal ◽  
Signal Processing Method

Investigation of optical current transformer signal processing method based on an improved Kalman algorithm

2018 ◽  
Vol 57 (01) ◽  
pp. 1
Author(s):  
Yan Shen ◽  
Jin-ming Ge ◽  
Guo-qing Zhang ◽  
Wen-bin Yu ◽  
Rui-tong Liu ◽  
...  
Keyword(s):  
Signal Processing ◽  
Current Transformer ◽  
Processing Method ◽  
Signal Processing Method

scholarly journals One signal processing method of OCT based on colored noise extended Kalman filter

2018 ◽  
Vol 232 ◽  
pp. 01009
Author(s):  
Jingru Zeng ◽  
Yansong Li ◽  
Jun Liu
Keyword(s):  
Signal Processing ◽  
Kalman Filter ◽  
Extended Kalman Filter ◽  
Colored Noise ◽  
Current Transformer ◽  
Processing Method ◽  
Extended Kalman Filtering ◽  
Signal Processing Method ◽  
Steady State Operation ◽  
Observation Noise

When an optical current transformer is used to measure current, its output signal is mostly non-linear and contains colored noise; on the other hand, when the power system is in steady state operation, the frequency is not stable. This paper proposes an optical current transformer signal processing method based on colored noise extended Kalman filter which can reduce the measurement error caused by colored noise and realize frequency tracking. The following two cases are considered: 1) the dynamic noise is colored noise; 2) the observation noise is colored noise. In these two cases, the corresponding formulas of the proposed method are analyzed and derived. Simulation results showed that the extended Kalman filtering method based on colored noise can effectively filter the colored noise, and the output waveform and output error obtained by this method are improved effectively.

scholarly journals Fault Mechanism of Fiber Optical Current Transformer Based on Signal Processing Method

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Fubin Pang ◽  
Qiang Huang ◽  
Yu Liu ◽  
Peng Li ◽  
Xiangping Kong ◽  
...  
Keyword(s):  
Signal Processing ◽  
Second Harmonic ◽  
Harmonic Component ◽  
Current Transformer ◽  
Processing Method ◽  
Fault Analysis ◽  
Measured Current ◽  
Signal Processing Method ◽  
Fiber Optical ◽  
Fault Mechanism

The fiber optical current transformer (FOCT) with sine wave modulation has been widely used in the DC transmission project, while its fault rate is much higher than that of an electromagnetic current transformer, which seriously threatens the safe operation of power grid. In order to investigate the fault mechanism of FOCT, the output signal model of the FOCT photodetector is established, and its basic methods of modulation and demodulation are analyzed to explore the influencing factors of the signal processing method used in the calculation of measured current. It is found that the reduction of the second harmonic component in the photodetector output is the root cause of FOCT fault, and the optical path, modulation signal amplitude, and measured current are important factors affecting the second harmonic component. The influencing law of three factors on the second harmonic component is calculated by simulation and the characteristic differences between them are given. Finally, the fault simulation test of FOCT light intensity and a modulation circuit were carried out in the laboratory, and the results verify the correctness of theoretical analysis. The research in this paper provides reference for fault analysis and reliability improvement of FOCT.

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