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Posted by divine das - 08-16-2017, 08:48 PM |
Dear representatives. Hi. I'm hoyun who has been studying SFCL application in DC power system from hanyang university in KOREA. I'm wondering if i know method to design inductive sfcl (saturated iron core type and shielded type sfcl). Would you mind teach me about design method inductive type sfcl in matlab. I wanna apply in HVDC power system.its specification is 154kv rated voltage. Please contact to me as soon as possible. Thank you. Kinds regards. My mail adress : [email protected] |
Posted by be.divya - 08-16-2017, 08:48 PM |
Increases in the installed capacity and the interconnection of the transmission networks lead to possibility of fault currents. Fault currents results from various kinds of high voltage stresses caused by lighting and short circuits or other system disturbances, which send a surge power through the grid. One of the usages of superconductors is protecting electronic devices and systems from short circuit [1]. There are three types of superconductors fault current limiters (SFCL): resistive, inductive and hybrid. Protection of scheme from current overload by resistive SFCL is based on nonlinear current-voltage characteristic of the superconductor. When current density exceeds some critical value, superconductor come to normal state and its electrical resistance rapidly increases. In order to design SFCL for practical applications, knowledge of SFCL parameters such as maximum load, response time and thermal recovery time is essential [2]. On the other hand, the electromagnetic and thermal response of a SFCL to a fault involves very high voltages and currents at very short times, and therefore there is a formidable challenge for experiments. Computer simulations are obviously helpful, since they allow to research on arbitrary time scales and power levels. Modelling and analysis of superconducting fault current limiter include simulation of thermo- and electrical behaviour. Thermal properties deal with resistive heating caused by current losses, increasing resistance etc. Electrical conductivity nonlinearly depends on temperature and current density. Thus, simulation of SFCL is complicated due to interdependence of thermal and electrical properties, and nonlinear dependence of electrical characteristics from temperature and current density. Many models of superconductor fault current limiter were implemented and evaluated [ 3, 4, 5]. But there are still unsolved problem of integration these models to existing CAD systems. In this paper we present a simulation of the resistive SFCL behaviour with Matlab/Femlab/Simulink environment. Mathematical model built in Femlab can be easily integrated with existing designing systems built with Matlab/Simulink. |