A Random Error Characteristic Analysis Method of Optical Fiber Current Transformer Based on Total Variance

Abstract

A random error characteristic analysis method of optical fiber current transformer based on total variance, the method first collects the current signal of optical fiber current transformer through serial output, and obtains the observation data; Carry out zero-mean, trend item and standardization processing; test the stationarity, periodicity and normality of the processed data to obtain a stable, normal, and zero-mean data sequence; use the total variance method to perform variance processing on the data sequence; finally The logarithmic curve fitting of the total variance and the correlation time (τ) is carried out by using the square sum of the variance of the random error source, and five random error coefficients in the current information of the optical fiber current transformer are extracted. The invention can analyze the random error characteristics of the optical fiber current transformer more accurately, effectively solve the shortcoming of the traditional Allan variance method that the estimated value fluctuates violently, and provide guidance for the performance design of the optical fiber current transformer and compensation of random errors.

Description

technical field [0001] The invention relates to the field of error analysis of current transformers, in particular to a method for analyzing random error characteristics of optical fiber current transformers based on total variance. Background technique [0002] Optical fiber current transformer is an important process layer equipment in smart substation, which provides current and voltage information for smart substation bay layer equipment, and realizes functions such as power system relay protection, electric energy metering, fault recording, and status monitoring. Optical fiber current transformers realize real-time measurement and monitoring of current signals, and provide input signals for power system relay protection, electric energy metering and other equipment. The random error of the fiber optic current transformer has an important impact on its performance accuracy, so higher requirements are put forward for the analysis of its random error characteristics. The ...

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Problems solved by technology

In view of the fact that there is a basic leakage phenomenon in the transfer function of Allan’s variance, the estimated value of the variance is insufficient to oscillate violently when the correlation time is close to half of the total measurement duration, and the confidence level is low, so it can only effectively analyze ideal time-varying and stationary signals, and cannot Accurately characterize the variance fluctuation of non-stationary signals in different frequency ranges

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