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Multi-cycle scan-based tests allow more faults to be detected by keeping the circuit in functional mode for more than one clock cycle. Optimizing a multi-cycle test set can improve test quality and/or test application time. It is also possible to capture the primary outputs of a circuit multiple times between the scan operations. This ensures that if a fault is detected at the primary outputs, increasing...
This paper is devoted to the development of objects and methods in on-line testing. Requirements imposed to computer systems and on-line testing of their digital components are analyzed in efficiency of use of resources and in restriction of the hidden processes. The low level of execution of these requirements in the modern computer systems and in circuits of on-line testing because of domination...
Triggered vacuum switch (TVS) has tiny turn-on time, huge power capacity and breaking ability in zero-crossing, and can be used to implement controlled reclosing technology. However, TVS has to break circuit reliably in zero-crossing. The reclosing peak current and transient voltage in 10 kV lines was estimated to determine the electrical transient parameters that the TVS worked with, and then an...
The approach proposed in this paper engages FFT to the linear analog circuit specifications determination. The method allows to calculate the observed circuit under test parameter based on the step response analysis. The approximating equation that models the relationship between the selected frequency components and the observed specification is determined by means of multiple linear regression....
This paper presents a converter topology for the realisation of high power grid simulators. This can be used for highly flexible simulation and testing of the grid compliance of renewable energy conversion systems, even for the certification procedure of the electrical characteristics.
Over the past decades, many synchrophasor applications have been developed but the performance under various PMU errors has not been explored and is unknown for most applications. This paper discusses the impact of PMU measurement errors and limitations originated from hardware implementation of various phasor estimation algorithms on the accuracy of the synchrophasor-based fault location application,...
The need to maintain and replace ageing equipment in South African national energy utility (ESKOM) and local municipalities has increased over the years. The country is currently experiencing power cuts from time to time inconveniencing factories and customers at large, as a result. This paper focuses only on the maintenance planning and execution of protection system of the utility distribution substations...
Over the past few decades, the use of reconfigurable computing for aerospace applications has become increasingly common despite its sensitivity to ionizing radiation. Tools are needed to test and implement fault-mitigation mechanisms to increase the reliability of FPGAs in space. This paper introduces a tool called the JTAG Configuration Manager (JCM) that provides high-speed programmable access...
The memristor was originally defined as one of the fundamental electrical elements which provided the vacant connection between charge and flux. So far, most of the research has concentrated on the unique features of the individual devices. And the overall behavior of the multiple memristive systems has not been fully studied. Especially, the lack of corresponding fault diagnosis method for complex...
Aiming at evaluating the SEE performance of complex electronic system, the multi-signal flow graph (MSFG) method is adopted. Based on the theory of the MSFG, the SEE soft error propagation model is proposed, and an analysis methodology is stated. For complex electronic system which consists of VLSIs devices, such as SRAM-based FPGA, the MSFG model has been established and simulated in TEAMS software...
The IEEE 1687 standard describes reconfigurable structures allowing to flexibly access the instruments existing within devices (e.g., to support test, debug, calibration, etc.), by the use of configurable modules acting as controllable switches. The increasing adoption of this standard requires the availability of algorithms and tools to automate its usage. Since the resulting networks could inevitably...
High reliability of HV SF6 switchgear makes an internal arc fault an extremely rare event. However, its occurrence cannot be completely avoided, and therefore must be considered in the design process. Internal arc testing in SF6 is not recommended due to its harmful environmental impact, but if necessary, tests should be performed only inside special containers, that will prevent the release of SF6...
Functional test guarantees that the circuit is tested under normal conditions, thus avoiding any over-as well as under-test issues. This work is based on the use of Software-Based-Self-Test that allows a special application of functional test to the processor-based systems. This strategy applies the so-called functional test programs that are executed by the processor to guarantee a given fault coverage...
In this paper, we present a methodology to diagnose and localize the defects of pipelined analog-to-digital converters. A DFT is proposed to generate the required test stimulus and to provide the required controllability to collect the fault signature. A model is proposed to relate the fault signature to the fault type and to identify its location. Without losing the generality, the main focus of...
Voltage source inverters are essential systems in many applications. Thus, the diagnosis of the faults that could appear in these systems allows detecting, isolating, and identifying the faults. In this context the teaching of this subject is becoming very important. However, laboratory experience is fundamental in order to provide a real understanding of this subject. This paper presents a computer...
This paper is mainly focused on the task of design-for-testability (DFT) automation with emphasis on OBIST strategy for analog integrated circuits. The design procedures according to DFT flow are proposed. Three possible structural solutions for reconfiguration of original circuit into oscillator are considered. The set of rules for each solution is prepared as the formal procedures, which can support...
Power distribution equipment is the backbone of any Industrial process infrastructure. Safety and reliability are the two most important criteria in the proper functioning of the power distribution system. Low voltage switchgear is an important part of power distribution. Minimizing arcing faults in the switchgear is of utmost importance to enable a safe environment. Arcing faults increase the temperatures...
In this paper, development of the special converter transformer model (with 5 windings) and testing results of its differential protection is presented. The special converter transformer is mainly used for supply of rectifiers or converters, FACTS devices etc. This type of transformer can introduce non-standard fixed phase angle shifts such as 20o, 15o, 12o, 10o, etc. this is obtained by unique connections...
In this paper, the new testability analysis method of analogue circuits is presented. The observability of parametric faults is evaluated by determining a proper test signal that maximizes the error between the good and the faulty circuit at a target fault. The efficient method to optimize the multi-frequency test set by determining the basis of the decision matrix is presented. The decision matrix...
Testing for small delay defects (SDDs) is important due to their dominance in recent technology nodes. Unfortunately, all the SDD test quality metrics in the literature limit their assessment to the size of the delay defect tested under at-speed or slower clocks, which makes their results misleading under special cases such as faster-than-at-speed testing. Moreover, those metrics are inadequate for...
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