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.

Synchronous generator internal fault computation and experimental verification

Abstract: Along with the development of electric power industry, accurate analysis of faulted generators becomes more and more important. The paper presents a method for simulating internal faults in synchronous generators, consisting of a single path per phase, using direct phase quantities. Simulation results showing the fault currents, during single phase to ground faults and two phase to ground faults, are compared with actual fault currents to verify the proposed method.

Fault indicator having trip inhibit circuit

Abstract: A fault indicator includes a status indicator for indicating normal and fault conditions on a monitored conductor. Trip circuitry within the fault indicator conditions the status indicator from a normal-indicating to a fault-indicating state upon the occurrence of a fault current in the conductor. Trip inhibit circuitry, including a loss of voltage sensor, inhibits the trip circuitry following a power failure whereby the fault indicator is rendered insensitive to inrush current during a period immediately following restoration of power to the system.

Fault Tolerant Strategies for BLDC Motor Drives under Switch Faults

Abstract: In this paper, the fault tolerant system for BLDC motors has been proposed to maintain the control performance under switching device faults of inverter. The proposed fault tolerant system provides compensation for open?circuit faults and short-circuit faults in power converter. The fault identification is quickly achieved by simple algorithm using the characteristic of BLDC motor drives. The drive system after fault identification is reconfigured by the four-switch topology connecting a faulty leg to the middle point of DC-link using bidirectional switches. The feasibility of the proposed fault tolerant system is proved by simulation.

A wavelet based approach for classification and location of faults in distribution systems

Abstract: Electrical distribution system, which is the largest portion of networks, acts as a final power delivery path to the end users. Hence, ensuring its efficient and reliable operation is an extremely important and challenging task. Utilities, all over the world are competing for improvement in service to consumers, and the area of fault detection and diagnosis in distribution systems have attracted the significant attention of researchers in last few decades. With availability of inadequate system information and presence of high impedance faults, locating faults in a distribution system pose a major challenge to the utility operators. Most of the previous work on fault identification and location concentrated on estimating the status of circuit breakers and relays with aid of some algorithmic approaches. In this paper, a fault identification and location technique using wavelet multi-resolution approach for radial distribution systems are proposed. The current measurements at the substation, available in the distribution network have been utilized and the effectiveness of the proposed approach is demonstrated on 7-node and 19-node three-phase test systems.

Method and apparatus for ground fault protection

Abstract: A method and apparatus for monitoring a centrally controlled power distribution system is provided. The method includes sampling an electrical current flow in the centrally controlled power distribution system (10), transmitting the sampled current signals to a central control processing unit (24), determining a ground fault presence and location based on the current signals received from all of the node electronics units (20), and isolating the determined ground fault by opening circuit breakers (16) supplying power to the fault. The apparatus is configured to sample an electrical current flow in the centrally controlled power distribution system (10), transmit the sampled current signals associated with each circuit breaker (16) to a central control processing unit (24), determine a ground fault presence and location based on the current signals received from all of the node electronics units (20) in the power distribution system (10), and isolate the determined ground fault by opening.