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In electrical power systems, such as data centers and hospitals, where service continuity is essential, the electrical operation management must be organized and it is necessary to have an emergency response team available at all times (24/7). In hospitals, for instance, doctors, surgeons, administrators, medical devices are rightly at the forefront, but electrical and technological systems and team...
A new fault location method for untransposed transmission lines with multiple derivations is presented in this article. It is based on pre-fault and post-fault voltage and current phasors, measured on steady-state at local and remote terminals, to determine the fault information, such as: the section of occurrence, the distance, i.e. the point of occurrence, and the resistance.
With the increase of wind plants integrated to the power system, the effect of the wind power generation on the system has become more and more severe. The connection of wind power plant changes the short-circuit current in distribution network. Protections now used must be adjusted and changed to ensure correct fault clearing with right method, and maintain the safe and stable operation of the distribution...
Wind Farms (WFs) that are nowadays connected to the German distribution or transmission system have to fulfill the technical requirements stated in the 2009 revision of the German Renewable Energy Sources Act. On the one hand these requirements specify more precisely the already existing connection conditions they are based on. On the other hand they give additional criteria especially regarding the...
The fault current limiter (FCL) is considered as the ideal solution to limit the fault current in integrated electrical power systems with distributed energy resources because of its speed of response. However, there are some practical application issues for FCL in commercial industrial deployments. In this paper, the coordination issue of FCL with the other protective devices is discussed making...
Improved reliability and safety of the Medium Voltage DC (MVDC) power distribution systems on board of a ship are the objectives of this work. The authors propose the integration of the self-healing capability of the protection against power system faults, and the protection against measurement faults. Most of previous work in literature focuses on only one of these aspects at a time. Here, the authors...
By analyzing features of the power black-start system of northern Jiangsu district, the line current differential protection was set as the main protection for black-start path. Based on analysis of failure of black-start system, the fault current and voltage were verified to meet the distance and zero-sequence protection requirements. Furthermore, problems and solutions of back-up distance protection...
This paper presents a general method for pinpointing location of faults on a double-circuit transmission line by employing only voltage measurements at one or two buses based on the bus impedance matrix technique. The bus impedance matrix of the network with the addition of a fictitious bus at the fault point for each sequence network is constructed as a function of fault location. Fault location...
This paper deals with halogen luminaries, ones of the main used lighting sources in residential area. The use of these artificial light sources leads towards different operational constraints in the low voltage power systems, such as inrush currents, harmonics or high frequency perturbations. Hence, the aim of the work is the characterization and modeling of halogen luminaries in ATP-EMTP, in order...
Due to continued penetration of DG into existing distribution network, the tripping of DG during network fault condition may affect the network stability and reliability. Operation of DG should be remain during network temporary fault as far as possible in order to maximise the benefits of interconnection of DG and increase reliability of power supply service to consumers. Conventional three pole...
On marine distribution systems traditional protection schemes often fail to provide the necessary reliability and discrimination. In this paper, a novel protection scheme for a zonal system, as proposed for marine applications, is presented based on active impedance estimation. The power system impedance is measured by injecting a very short current transient onto the network via a coupling inductance...
Downed conductors, tree branches touching conductors, and failing insulators often cause high-impedance faults in overhead distribution systems. The fault currents of these faults are much smaller than detection thresholds of traditional ground fault detection devices, so reliable detection of these high-impedance faults is challenging. Although fault currents can be much smaller in ungrounded systems...
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