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.

The Z-source breaker for fault protection in ship power systems

Abstract: The z-source breaker is a new kind of breaker which is designed specifically for dc power systems. Without a zero crossing, interrupted dc currents produce arcing and hence ac breakers would not be applicable. The z-source breaker resolves this problem because it is designed to turn off as soon as it experiences a sharp transient in current. In this paper a new design for the z-source breaker is considered so that load transients are not identified as faults. The design is also modified to accommodate bi-directionality which is required in mediumvoltage dc ship power systems. A higher-level coordinated control scheme is discussed which enables multiple breakers to coordinate and isolate the fault in a simple medium-voltage dc ship power system architecture with a central control unit.

Fault Section Identification Protection Algorithm for Modular Multilevel Converter-Based High Voltage DC With a Hybrid Transmission Corridor

Abstract: This paper addresses the protection of a high voltage direct current (HVDC) transmission system, utilizing the modular multilevel converter (MMC) topology in addition to incorporating a hybrid transmission corridor (transmission line including overhead line and cable sections). A solution is proposed for identifying the section within which a dc fault is located for the purpose of maintaining power delivery. A detailed model of the MMC-HVDC system is simulated using PSCAD and an in depth fault analysis is performed. A characteristic signal is discovered and then implemented into a novel solution. The end result is a fault section identification protection algorithm, implementing protective relay coordination to protect the system from false circuit breaker reclose as well as enabling fast system restart for nonpermanent faults. This restart protection algorithm is implemented without the use of a communications channel between converter stations, introducing novelty and quick restart response.

Experimental studies on impedance based fault location for long transmission lines

Abstract: In long transmission lines, the charging current caused by the shunt capacitance decreases the accuracy in impedance based fault location. To improve the accuracy of fault location, this paper presents a novel scheme, where two Digital Fault Recorders (DFRs) are installed in a line. They can send the transient data of the faults to the both ends of a line. To estimate the distance of a fault, impedance based fault location methods are applied with transient fault data of both ends protection relays and both DFRs installed in a line. To evaluate the proposed scheme, a laboratory setup has been developed. In the lab, several faults have been simulated and associated voltages and currents are injected to a relay IED to compare experimental results.

Optimization of fault indicators placement with dispersed generation insertion

Abstract: This paper presents an optimization method of fault indicator placement by genetic algorithms. Requirements such as the network structure with switchgear system, reliability factor, economic parameters and fault localization by switchgear can be taken into account in an objective function to minimize. The influence of dispersed generation, inserted in the distribution network, on the fault indicator placement is also carried out. The tool created provides help to select the optimal fault indicator placement in the network following different objectives.