Fault indicator

About: Fault indicator is a research topic. Over the lifetime, 10057 publications have been published within this topic receiving 143482 citations. The topic is also known as: FCI & power line fault indicator.

A Simulator of Small-Delay Faults Caused by Resistive-Open Defects

Abstract: We present a simulator which determines the coverage of small-delay faults, i.e., delay faults with a size below one clock cycle, caused by resistive-open defects. These defects are likely to escape detection by stuck-at or transition fault patterns. For the first time, we couple the calculation of the critical size of a small-delay fault with the computation of the resistance range of the corresponding resistive-open defect for which this size is exceeded. By doing so, we are able to extend probabilistic fault coverage metrics initially developed for static resistive bridging faults to small-delay defects.

Method of Generating Fault Indication in Feeder Remote Terminal Unit for Power Distribution Automation System

Abstract: The present invention relates to a method of generating fault indication in a feeder remote terminal unit for a power distribution automation system. The method is performed in a distribution system that includes a plurality of feeder remote terminal units, which are installed in respective sections of a line and are configured to measure voltage, current and a phase difference of the line, and a central control unit for determining whether a fault occurs and controlling operation of the feeder remote terminal units. In the method, phases are measured by each of the feeder remote terminal units. The phase of a zero-sequence current is compared with that of a zero-sequence voltage. A direction of a fault current is calculated, and fault indication information is generated in the calculated direction of the fault current.

Fault diagnosis in transmission lines using wavelet transform analysis

Abstract: This paper presents a new method to diagnose faults in a transmission system This is based on detecting high frequency components contained in a fault signal spectrum The discrete wavelet transform (DWT) is used in the analysis in order to classify fault types and to locate fault positions Simulations are performed using ATP/EMTP It is found that the proposed method gives satisfactory results, and will be very useful in the development of a power system protection scheme

Fault experiments in a commercial-scale PV laboratory and fault detection using local outlier factor

Abstract: The experiments of line-line faults in solar photovoltaic (PV) arrays are implemented in a 35kW commercial-scale PV laboratory. The paper discusses both the transient response and post-fault behavior of the PV system (DC side), including PV array, overcurrent protection devices (OCPD, i.e. fuses) and grid-connected PV inverter. The experimental results demonstrate that fault locations and the maximum power point tracking (MPPT) may significantly reduce the fault current magnitude so that the fault is not detectable by OCPD. To eliminate the protection “blind spot,” statistic outlier detection rules are applied on the PV-string monitoring system, but sometimes they may cause false alarms. To address this issue, the local outlier factor (LOF) is developed in PV installations that shows improved fault detection. In experimental results, the proposed method demonstrates several advantages over traditional PV monitoring systems, such as simplicity, quick response, easy implementation and no requirement of weather information. The limitations of the proposed method are also discussed.