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.
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TL;DR: In this article, an online fault detection scheme for a sample power system is introduced based on the use of a variable structure system called "sliding mode observer" where information contained in the output measurements is utilized to detect the onset of faults in the transmission network of the sample power systems in real time and online.
53 citations
TL;DR: In this paper, a fault location scheme for transmission systems consisting of an overhead line combined with an underground power cable is presented, which can be used on-line or off-line using the data stored in the digital fault recording apparatuses.
53 citations
Patent•
04 Aug 1981
TL;DR: In this paper, a fault indicator for indicating the occurrence of a fault current in a power distribution system includes a test-point-mounted circuit module and a remotely-mounted indicator module.
Abstract: A fault indicator for indicating the occurrence of a fault current in a power distribution system includes a test-point-mounted circuit module and a remotely-mounted indicator module. The indicator module incorporates a bidirectional magnetic winding and a magnetic indicating element having a magnetic state conditioned by energization of the winding. Upon the occurrence of a fault in the power system trip circuitry within the circuit module energizes the winding with current in one direction to condition the indicator element to a fault-indicating magnetic state. Upon restoration of current in the system, reset circuitry within the circuit module energizes the winding with current in the opposite direction to condition the indicator to a reset-indicating magnetic state. The use of currents of opposite direction in a single magnetic winding provides greater flux density at the indicating element, and enables the indicator module to be connected to the circuit module by means of a two conductor cable. Alternate embodiments of the invention, utilizing visual-type indicator modules and current-reset modules, are also shown.
53 citations
TL;DR: In this paper, an optimal meter placement scheme is proposed for determining the optimal locations to place meters so as to make the system observable while minimizing the required number of meters to reduce costs.
53 citations
TL;DR: In this paper, the authors studied a simple, radial electric network configuration with a machine and an infinite network and the consequences of the recovery time of the fault current limiter in the case of a short circuit.
Abstract: Transient stability investigations consist of studying the rotor oscillations of generators (electro-mechanic oscillations, 0.1-2 Hz) after the occurrence of a fault of large amplitude, e.g. a short circuit. The goal is to indicate if the generators are capable to stay synchronous after a fault has occurred. The fault duration is one of the most important factors to be determined. In fact, the shorter the fault, the more the maintaining of synchronisation can be guaranteed. Now in case of a fault, a fault current limiter has an extremely fast current transition in comparison to electromechanical time constants. This implies a quasi-instantaneous elimination of the fault through a limitation of the current and consequently a better ability to maintain the synchronisation of the system. The authors recall that in a classic system, the elimination of a fault, by opening a circuit breaker, is carried out in two or three cycles in the best case. They have studied a simple, radial electric network configuration with a machine and an infinite network. The study covers simulations of a fault that can occur in a network and the consequences of the recovery time of the fault current limiter.
53 citations