scispace - formally typeset
Search or ask a question
Topic

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.


Papers
More filters
Patent
21 Jul 1995
TL;DR: Fault detection control logic analyzes the input control signals and also applies them to change the state of the transistors in the H-bridge as discussed by the authors, which prevents the detection of fault conditions during operating modes or conditions that can produce false fault conditions.
Abstract: An automatic fault monitoring system prevents the detection of fault conditions during operating modes or conditions that can produce false fault conditions. A motor control system that utilizes an H-bridge circuit having active devices, preferably field effect transistors, in each arm of the bridge. The motor is connected in the leg of the bridge. Currents and voltages are sensed in each arm as different operating conditions represented by input control signals, which may be computer generated, drive the bridge and place the transistors in different states (on or off). Such operating conditions include rotation of the motor in opposite directions and reversal of direction. Fault detection logic is responsive to currents and voltages in the arms and leg of the bridge and provides outputs indicative of over-current fault conditions in the arm and open circuit fault conditions in the leg. Fault detection control logic analyzes the input control signals and also applies them to change the state of the transistors in the H-bridge. When the control signal inputs and the sequence in which they occur represents a command to the H-bridge to reverse the direction of rotation of the motor, the fault detection logic is inhibited thereby preventing false detection of over-current conditions that can occur in response to the back EMF generated by the motor as it stalls and stops briefly while reversing direction of rotation. The fault detection control logic also enables the detection of open load fault condition during states where the motor is being driven in either direction of rotation, but not when a reversal of rotation is occurring or the motor is started from a stopped position and the current in the motor must build exponentially.

40 citations

Journal ArticleDOI
TL;DR: In this article, a fault-tolerant controller is proposed to guarantee that all signals in the closed-loop system are semi-globally uniformly ultimately bounded, where the controller singularity is avoided without projection algorithm.
Abstract: This paper discusses the problem of fault-tolerant control against actuator fault, derives the time spent at each steps in fault diagnosis which is called as the time delay due to fault diagnosis and quantitatively analyzes its effect on the faulty system’s performance. A fault diagnosis algorithm is first proposed. The proposed fault tolerant controller is designed to guarantees that all signals in the closed-loop system are semi-globally uniformly ultimately bounded, where the controller singularity is avoided without projection algorithm. What’s more, the analytical expression of the time delay is derived strictly. Further, the quantitative analysis of system performance which is degraded by the time delay is developed, and the conditions that the magnitudes of the faults should be satisfied such that the faulty system controlled by the normal controller remains bounded even stable during the time delay are derived. In addition, the corresponding solution to the adverse effect of the time delay is proposed. Finally, an experimental test shows that the proposed control algorithm has a very reliable efficiency.

40 citations

Journal ArticleDOI
TL;DR: In this paper, a fault detection method based on a time-frequency matrix (TFM) and polarity distribution matrix (PDM) singular values clustering algorithm is presented, which is decomposed by singular-value decomposition (SVD) and merged together to form the amplitude-polarity feature matrix (APFM).

40 citations

Patent
07 Aug 1980
TL;DR: A ground fault circuit breaker including ground fault interruption means and overload interruption means that are independently responsive to open a common set of breaker contacts upon respective ground fault and overload conditions with a trip indicator visible external to the breaker that operates on actuation of the ground fault interruptions but not upon operation of the overload interruptions is described in this article.
Abstract: A ground fault circuit breaker including ground fault interruption means and overload interruption means that are independently responsive to open a common set of breaker contacts upon respective ground fault and overload conditions with a trip indicator visible external to the breaker that operates on actuation of the ground fault interruption means but not upon operation of the overload interruption means with means for electrically actuating the trip indicator upon occurrence of a ground fault condition that actuates the ground fault interruption means.

40 citations


Network Information
Related Topics (5)
Electric power system
133K papers, 1.7M citations
91% related
Voltage
296.3K papers, 1.7M citations
85% related
Control theory
299.6K papers, 3.1M citations
84% related
Control system
129K papers, 1.5M citations
84% related
Wind power
99K papers, 1.5M citations
82% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202381
2022215
202127
202061
2019116
2018160