Open conductor ult is in series with the line. These re unsymmetricl ults or unblnced ults except three phse open ult. 184Ģ Open circuit ults re representing s series ults. Types o open circuit Fult Thus, single nd two phse open conditions cn produce the unblnce o the power system voltges nd currents tht cuses gret dmge to the equipment. The most common cuses o these ults include: joint ilures o cbles, overhed lines, ilure o one or more phse o circuit breker nd lso due to melting o use or conductor in one or more phses. The igure (1) below obtin types o open circuit ults or single, two nd three phses (conductors). Open Circuit Fults These ults occur due to the ilure o one or more conductors. Further, these ults cn be symmetricl ults or unsymmetricl ults. TYPES OF FAULTS Electricl ults in three-phse power system cn be clssiied into 2 types, nmely open circuit ults nd short circuit ults. Then using the NEPLAN sotwre the procurtion, discussion nd conclusion the results. Then we tlk bout trnsient nd permnent ults. And devoted to bnorml system behvior under conditions o symmetricl nd unsymmetricl ult in power system networks. n this pper, is devoted to types o ult in trnsmission line nd mthemticl nlyses bout it. This results in the interruption o the norml opertion o the network, ilure o equipment, electricl ires, etc. The ults in power system cuses over current, under voltge, unblnce o the phses, reversed power nd high voltge surges. Once the ult tkes plce in circuit or device, voltge nd current vlues devites rom their nominl rnges.
Under norml operting conditions, the electric equipment into power system network operting t norml voltge nd current rtings. The ult lso involves in insultion ilures nd conducting pth ilures which results short circuit nd open circuit o conductors.
n ct, there re deerent types o ult occur in power system network eective t prts o the network (trnsormers, genertors, trnsmission lines, bus brs, motors nd the lods) i not tret it this ults cn be cused dmge in prts o network nd due to economic losses. A ult in n electric power system cn be deined s ny bnorml condition o the system tht involves the electricl ilure o the equipment. NTRODUCTON n power system network, it is necessry to design the equipment s (circuit breker, c.t, v.t, rely etc.), to detect nd control the network ginst ny deerent ult occur, this clled protection systems. Keywords- Power System Fult Anlysis, unsymmetricl Fults, Symmetricl ults, open circuit ult, short circuit ult nd trnsient ults. The clcultion or ult current is done in NEPLAN progrm creted by input the sme dt t severl s nd compred with the clcultions. n this pper n exmple o 3 bus system is tken with ult t 50% rom trnsmission line. The ulted network cn be solved conveniently by grphicl user interce NEPLAN. 6, issue 60, Jnury 2017 SSN: Using Grphicl User nterce NEPLAN to Clculte the Trnsmission s Fults in Power System Must Mhmood Abd Eng., Al-Mustnsiriy University, College o Engineering, Bghdd Abstrct- A ult represents the structurl network chnge equivlent cused by the ddition o impednce t the plce o Fult.
1 nterntionl Journl o Science nd Engineering nvestigtions vol.