Development of Fault Detector for Series Arc Fault in Low Voltage DC Distribution System using Wavelet Singular Value Decomposition and State Diagram

Abstract

-It is well known that series arc faults in Low Voltage DC (LVDC) distribution system occur at unintended points of discontinuity within an electrical circuit. These faults can make circuit breakers not respond timely due to low fault current. It, therefore, is needed to detect the series fault for protecting circuits from electrical fires. This paper proposes a novel scheme to detect the series arc fault using Wavelet Singular Value Decomposition (WSVD) and state diagram. In this paper, the fault detector developed is designed by using three criterion factors based on the RMS value of Singular value of Approximation (SA), Sum of the absolute value of Detail (SD), and state diagram. LVDC distribution system including AC/DC and DC/DC converter is modeled to verify the proposed scheme using ElectroMagnetic Transient Program (EMTP) software. EMTP/MODELS is also utilized to implement the series arc model and WSVD. Simulation results according to various conditions clearly show the effectiveness of the proposed scheme.

Development of fault section identification technique for low voltage DC distribution systems by using capacitive discharge current

“…However, there is a paucity of studies related to the construction of a reliable LVDC distribution system due to differences when compared to conventional systems and especially in relation to its structural characteristics [1,2]. According to the Computer Business Equipment Manufacturers Association (CBEMA) curve, sensitive components are damaged by voltage that corresponds to 70% of its rated value even if it only lasts for 100 ms [3,4].…”

“…This current displays a distinct feature of the fault, and thus it is necessary to perform an analysis of the capacitive discharge current during the transient state immediately after the fault. Thus, Prony's method can be Yun-Sik OH fivebal2@skku.edu 1 utilized for fault analysis as shown in previous studies [9,10]. However, the anti-parallel diodes can be damaged after the DC-link capacitor is fully discharged due to the discharge of line inductor and voltage source [11][12][13].…”

Modeling and Analysis of a Low-Voltage DC Distribution System

“…Figure 22 shows the load current for all case studies. Each result shows a different characteristic according to the fault condition [31]. The series arc has a random characteristic, which is represented as a very "spiky" profile in the current waveform.…”

“…The model is implemented using EMTP/MODELS [31], and the series arc fault is assumed to occur at the load end where a very low voltage is applied, because this kind of fault is uncommon at higher voltage levels. We divide the simulation cases according to the various fault types and event sequences as shown in Table 9.…”

Investigation of Degradative Signals on Outdoor Solid Insulators Using Continuous Wavelet Transform

“…Wavelet has numerous applications including transient signal analysis, mechanics, communications, radar, pattern recognition etc. [15][16][17][18]. The wavelet transform converts a signal by using small wavelets (wave-like oscillation) from time domain to the time-scale domain within limited time duration [12].…”