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This paper presents a new impedance based fault location method in the case of single phase to earth faults. This method utilized the measured impedance by distance relay and super imposed current factor, which is the ratio of post-fault current to super imposed current, to discriminate the fault position on the line. This method is robust against the fault resistance. The presented method only uses...
This paper presents an accurate algorithm for locating faults on a series-compensated line. It applies two-end currents and one-end voltage and thus can be applied with current differential protective relays. The algorithm applies two subroutines and the procedure for selecting the valid subroutine. The algorithm has been evaluated using the fault data of ATP-EMTP versatile simulations of faults on...
In this paper a novel numerical algorithm for locating faults on transmission lines will be presented. The algorithm does not need the line parameters to locate the fault and can locate all fault types, which makes it very different to existing fault location methods. Line parameters are known only approximately and they differ with varying loading and weather conditions, so an algorithm that does...
This paper presents a new multi-ended fault locator algorithm which uses line current differential relay synchronized measurements of currents and voltages, applicable to both 2-and 3-terminal lines. The described algorithm is executed separately at each terminal and the result is available at each terminal immediately after fault.
A new fault location method for distribution automation of active network is presented. It compares the phase angle of fault currents at both ends of a feeder section when the fault current contribution of downstream distributed generation also exceeds overcurrent setting. The measurement of phase angle is synchronized by the fault itself, and the fault is detected by comparing the current deviation...
Underground distribution cables are usually characterized with different technical difficulties regarding detecting and locating their faults. Different factors participate into these difficulties including their remarkable charging currents, cable construction and variations of their equivalency resulted from the variety of bonding and grounding methodologies. In this paper, a new fault location...
Power grid intellectualization is an important method to promote the development of renewable energy source and implement energy conservation and emission reduction. Along with the increasing development of power electronics, IT and communication technologies, the construction of smart grid is becoming an important development direction of electric power industry. Smart distribution grid is a critical...
Multiterminal lines can be protected by distance protection and/or unit protection schemes. A well known fact of multiterminal lines, equipped with distance protection, is the inherent complexity for current in-feed and backup zone coverage. Prior to this millennium most relays (for this particular application) were unable to achieve the desired backup coverage due to limitations in zoned technologies...
An improved differential equation method for earth fault location in non-effectively earthed system is proposed. Karrenbauer transformation is used to construct the compound mode network of single phase earth fault. Based on the mode network, the fault equation including mode voltage, mode current, line parameters and earthed resistance is derived .The fault distance can be gotten by solving the equation...
The electrical infrastructure will face great challenges with the coming energy transition to a sustainable and differentiated energy supply system. Although the existing grid is of reasonable age we believe that introduction of advanced secondary system technology will prolong the utilization of the current grid and shape it to become a flexible Smart Grid at acceptable cost. A visionary design will...
A new approach using transient signals for earth fault location in non-solidly earthed overhead lines is presented. The characteristics of zero module network are analyzed in detail. Also, the product of zero-module voltage after Hilbert transform and zero-module current in selected frequency band is determined the direction of the fault. The earth fault can be located in accordance with the difference...
In view of the special structural characteristics of traction power supply system, the paper proposed a new method based on the principle of double-ended voltage travelling waves to make fault location. Double-ended travelling waves fault location avoids the drawbacks of impedance method, and it makes huge significance to the high-speed electrified railway of China. Application system of this method...
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