The topic is self-correcting function, and the text is autocorrelation function. I don't know if it's the original or the typo, but I translated it according to the original.
A new principle for distinguishing inrush current and internal fault current of transformer based on self-tuning function.
Foreword: Abstract-
abstract:
When differential protection relay is applied to transformer protection, how to identify inrush current and short circuit current caused by internal fault is a key problem. When differential protection relay is used for transformer protection, how to distinguish between inrush current and short-circuit current caused by internal fault is a key problem. Here, the surge current and short-circuit current are regarded as random signals, the sampling data are analyzed by the correlation function principle in digital signal processing (DSP), and the autocorrelation function of the sampling data is calculated. In this paper, the inrush current and short-circuit current are regarded as random signals, and the correlation function principle in data signal processing (DSP) is used to analyze the sampled data and calculate the autocorrelation function of the sampled data. The short-circuit current and the induced current can be distinguished according to the magnitude of the similarity coefficient through the similar comparison operation of the standard autocorrelation function (SSCF) formed by sinusoidal current. Through the similar comparison operation of standard autocorrelation function (SSCF) formed by chord current, the short-circuit current and inrush current are distinguished by the amplitude of similarity coefficient. The experimental results of Power Dynamic Laboratory (EPDL) verify the feasibility of this method. The results obtained in the Electric Power Dynamic Laboratory (EPDL) confirm the feasibility of the proposed method. Index terms-transformer, differential protection relay, SSCF, correlation function, inrush current, short circuit current, random signal, EPDL.
Index words: transformer; Differential protection relay; SSCF； Correlation function; Surging; Short circuit current; Random signal; EPDL
Abstract: Large power transformer is a very expensive and important component in power system. High-power transformer is very expensive and is an essential component in power system. Therefore, the research on its protection technology puts forward higher requirements; Therefore, it is very necessary to study their protection technology; This includes reliability requirements related to error-free operation, safety requirements related to error-free tripping and operating speed requirements related to short fault clearing time. This includes requiring reliability related to error-free operation, safety related to error-free tripping, and operating speed related to short fault clearing time. In the relay protection of power system, the protection of large power transformer is a very challenging problem. The protection of large power transformer is a very challenging problem in power system relay protection.