modelling simulation of transmission line auto

8/16/2019 Modelling Simulation of Transmission Line Auto

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Modelling & Simulation of Transmission LineAuto-reclose Scheme Using Matlab/Simulink

1MUHD HA!"! !D#!S1SU#$A HA#D!

%MHD "AM#! HASA'1S$A#UDD!' HASA'

1!'D#A '!S(A

1'# HA'!SAH )AHA#UD!'

1School of Electrical System Engineering& %Faculty of Engineering Technology

Universiti Malaysia Perlis


2/17

!ntroduction Auto-reclose *A/#+ rela, is one of imortant rotection rela,s

installed at the transmission line. !t is used to re-energie the line back to oeration after been

tried b, main rotection rela,. Most of fault occurrences at transmission line are transient in

nature and onl, small ercentage 0as due to ermanent fault. Some of transient fault causes are lightning strike on hase

line momentar, contact bet0een foreign ob2ect and haseline momentar, clashing of hase conductors etc.

Auto-reclose rela, can be classi3ed into t0o categories 0hich

are single-shot and multi-shot schemes. !n single-shot auto-reclose onl, one reclose attemt 0ill be

made for an, fault occurrence. !n this categor, the breaker 0illbe tried and locked out for the case of ermanent fault ore4ol4ing fault during reclaim time.


3/17

!ntroduction The alication of auto-reclose rela, along 0ith main

rotection rela, is di5erent for di5erent le4el of 4oltage attransmission line.

All three hases of the line might be tried and reclosed

together at the same time e4en though fault occurred atonl, one hase of the line. !n this research Sim6o0erS,stems toolbo7 inside

Matlab/Simulink ackage 0as used to model and simulatetransmission line e8ui4alent sources load o4er-currentrela, and auto-reclose rela,.

The model can be used to increase the understanding onauto-reclose scheme eseciall, in transmission line net0orks,stem.

MATLA) is a soft0are 0hich is suitable for technicalcomutation. !t can comute 4isualies and rogram the

mathematical e8uations in an eas, 0a, and eas, to beunderstood. !t also has man read built block-sets for


4/17

6ro2ect Scoes Auto-reclose scheme is one of rotection scheme 0hich is

comle7 and di9cult to be understood because it re8uiresman, arameters and conditions to be ful3lled before an,decision can be made.

!n this research se4eral limitations 0ere alied to ease therocess of modelling and simulation. The scoes are asfollo0s:

Single Line-to-ground ault

De3nite Time 4er-current #ela,

aults in the Line Length Single-shot Auto-reclose

Three-ole Auto-reclose

S,nchronism ;hecking < all conditions of s,nchronism areassumed ful3lled.

)reaker status and breaker read, conditions are assumedful3lled.


5/17

Modeling & SimulationModeling 6arameters & #ela,

Settings


6/17

Modeling & SimulationModeling 6arameters & #ela,

Settings


7/17

Modeling & Simulation

Substations transmission line load and measurementssubs,stem

#emote

)reaker


8/17


De3nite time o4er-currentrela,


9/17


Auto-reclose rela, subs,stem


10/17

Modeling & Simulation4erall model of auto-reclose

scheme


11/17

Simulation #esults A fault 0as initiated from =.=> s until =.1% s at 1= km from

local substation.

Local redhase current

*A+

Local rms redhase current

*A+


12/17

Simulation #esults

Local redhase-to-

ground 4oltage

*?+

Local rms redhase-to-

ground 4oltage*?+


13/17

Simulation #esults rom all igures after normal condition fault 0as detected at around

=.=@1 s 0hen fault current higher than icku current *!icku BC.>A+ but breaker 0as not tri ,et.

!t can be seen that current became 4er, high from nominal current 0hile4oltage droed from nominal 4oltage during fault condition.

After fault 0as detected timer of =. s of local de3nite time o4er-currentrela, 0as started and tri signal 0as sent to local circuit breaker ataround =.E% s and line current became ero due to oen circuit.

?oltage became ero as circuit breakers at both substations 0eretried at the same time.

At the same time of tri signal sent a signal 0as sent to auto-recloserela, to initiate/start auto-reclose rela,.

The dead time of 1.= s for local auto-reclose rela, 0as started andrunning until around 1.E s and local circuit breaker 0as reclosed.

The current still ero because remote circuit breaker didnFt reclosed ,et.


14/17

Simulation #esults After local breaker reclosed 4oltage at local substation

back to normal but slightl, higher than nominal 4oltage*e8ual to busbar 4oltage+.

At around %.=@> s remote breaker 0as reclosed after

remote auto-reclose rela, dead time of 1. s had beenelased. #emote breaker successfull, reclosed after all conditions

for remote auto-reclose rela, such as breaker in oencondition closing coil read, initiate/start signal from o4er-current rela, recei4ed and s,nchronism bet0een line andbusbar 4oltage 0ere achie4ed.

!t can be seen that after both breakers from local andremote substations successfull, reclosed current and4oltage back to nominal 4alue.


15/17

;onclusions Auto-reclose scheme 0as successfull, modelled and simulated

using Matlab/Simulink soft0are. rom the result the 0a4eforms roduced sho0 the caabilit, of

Matlab/Simulink soft0are in modelling and simulating o0ers,stem rotection scheme e4en for comle7 rotection scheme

such as auto-reclose scheme. !n the designed Simulink model some limitations and

assumtions 0ere alied to ease the modelling because theaim of this research is for educational urose and theimortant thing is the 0a4eforms roduced are as e7ected

and similar to results roduced b, dedicated rotection s,stemsoft0are.

Ho0e4er the limitations and ro2ect scoes can be furthermodelled in the future to simulate actual scheme alied intransmission substations.


16/17

#eferences

G1 6aul M. Anderson. 1IIE. 6o0er S,stem 6rotection. Jile,.

G% )ha4esh )hal2a #. 6. Mahesh0ari 'ilesh K. ;hothani. %=11 6rotection and S0ithgear 7ford

Uni4ersit, 6ress.

GB Abdul Halim Abu )akar & Shinichi !mai. %==%. Auto-reclose 6erformance on %@ k? and 1B% k? Transmission Line in Mala,sia. Transmission and Distribution ;onference and 7hibition. 6age*s+: >=B -

>=E 4ol.1

GC M. (annati ). ?ahidi S.H. Hosseinian S.M. Ahadi. %=11. A no4el aroach to adati4e single hase

auto-reclosing scheme for H? transmission lines. lectrical 6o0er and nerg, S,stems. ?ol. BB. 6.>BIC>.

G $esh0ant K. 6aithankar. 1II@. Transmission 'et0ork 6rotection: Theor, and 6ractice. 6o0erngineering *Jillis+ ;#; 6ress.

G> 'et0ork 6rotection and Automation Kuide. 6rotecti4e #ela,s Measurement and ;ontrol. Alstom Krid.%=11.

G@ ?iktor 6erelmuter. %=1%. lectrotechnical S,stems: Simulation 0ith Simulink and Sim6o0erS,stems.

;#; 6ress.

GE Matlab Ketting Started Kuide. #%=11b. MathJorks. %=11.


17/17

Thank You

modelling simulation of transmission line auto

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