Exp4 Transmision Line

8/10/2019 Exp4 Transmision Line

1/10


2/10

Section ( consist of impedance relay, o'ercurrent relay, selector s$itch for 56C load

unit 1 2.

Section 7 consists of t$o 'ariacs, selector s$itches for inductance of the transmission

line.

Section 8 consists of +CB and selector s$itch for capacitance of the transmission

line and tap changer for tap changing transformer.

2. Po$er analy0er 1 is internally connected at the sending end of the transmission line.!. Po$er analy0er 2, ! and ( can %e used independently.

(. Po$er analy0er should %e used together $ith CTs and PTs. It should %e ensure that phase

and neutral of meter should %e connected to the secondary of the PTs. S1 S2 of Po$er

analy0er should %e connected $ith the S1 S2 of the CTs.7. Po$er Analy0er 2 3PA2" should %e connected to PT2, PA! to PT! and PA( to PT(

respecti'ely. 3As the po$er analy0ers ha'e %een cali%rated $ith their respecti'e PTs."8. Sending end 'ariac 3'ariac 1" is internally connected. &ariac 2 should %e gi'en %y the

e/citation at primary side $hen used in the circuit.

Specifications

Sending End Transformer:

Primary9 ) :11) :22)&, Secondary9 22)&, !9 127)

"eceiving End Transformer:

Primary9 ):22)&, Secondary9 1;),1),1 sections9 7 #AC? S#CTI=9 )*+S.

#ach section 9 6 @ !7.)m?1;.) m?!.7m? 37A ma/"

5esistance 9 5 @ 2.8

Capacitance 9 1.().).8f

L#NE $!"!%ETE"S:

5 @ ).)!27*+, 6@).(!;7mh-m, C@).)17fd-m, ).)2fd and ))!7ufd 3selecta%le"

or ())-ms9

5 @ 1!, 6@1;7.)m?, C@).8fd, ).fd 1.(fd.3selecta%le"

&Note: Do not ma'e s(ort circuit )(en inductance selection is belo) *+m,-

2


3/10

Capacitor selector s$itch E 7 nos.1 for each section.

PS19 C @ ).8D,

PS29 C @ ).D,

PS!9 C @ 1.(D

LO!D#N. /N#TS:

"L0 /N#T12

!"#!3LE $OTENT#O%ETE"9 1*, 1))F

"ES#ST!N0E 3!N: 5 667

SF19 7*1)F 1)* 7F, SF29 2*(2)F, SF!9 1*2()F, SF(9 8)7)F,

SF79 !)2 18)F

#ND/0TO" 3!N: 5 6678 9+! TO 226+!

SF19 ;.7&A, SF29 17&A, SF!9 17&A, SF(9 !)&A, SF79 (7&A

0!$!0#TO" 3!N:

SF19 ).D, SF29 1.2D, SF!9 !.17D, SF(9 8D, SF79 D

"L0 /N#T16

!"#!3LE $OTENT#O%ETE":1*, 1))F

"ES#ST!N0E 3!N:

SF192*2)F, SF29


4/10

E:

P5I9 7A S#C9 1A, 7&A, C6 ).7

=O" SEND#N. END $O@E" !N!>AE": SE2

PT9 =I6 3=T#9 +AG 5+S IS !))&ac"

CT9 P5I 1)A, S#C9 7A, &A9 7, C69 ).7

%03BS

+AI=S +CB 9 2)A, 2P6#,

C=T56 +CB 9 2A.

&A5IAC E S#=DI=H #=D 9 8A

&A5IAC E 5#C#I&I=H #=D9 8A

O/T$/T OT!.E SELE0TO" S@#T0,:1 P6# 12FA, 8A

!LL TO..LE S@#T0,9 17A

!LL 0ONNE0TO"S9 BTI:17, #6C+ +A*#

#%$ED!N0E "E!L>: ?IH? &6TAH# +A*#, AJG9 2!)&AC 3:17K,L1)K"

OE" 0/""ENT "EL!>: 6T, CT S#C. 1A, AJG.


5/10

!%%ETE" 1 2

):2)A, +#C: S+P!7S E 1.

T#%E #NTE"!L %ETE" ? 2

).)))1 S#C T


6/10

b!ective ": To determine t(e !8 38 08 D parameters for long transmission line

To determine the ABCD parameter of the transmission line $e need to perform the open

circuit test and short circuit test on the transmission line for $hich the procedures are

gi'en %elo$.

Procedures#1. #nsure that the main +CB is s$itched %efore doing any connections. Also

ensure that relay s$itches are in Jnhealthy position.

2. Connect all the fi'e 4 sections for ()) *m of line using connectors.

!. Select the 'alue of !7m? for inductance and 1.(d of capacitance for each 4

sections.

(. Connect the output of the sending end 'ariac using connector at 22) 'olt le'el of the

transformer.

7. Open 0ircuit Test:

a. *eep the recei'ing end open circuited and then s$itch on the main +CB.%. S$itch on the CB1 3circuit %rea-er 1" and then &ary the -no% of the 'ariac 1 and

ma-e the sending end 'oltage 22) 'olt.

c. =o$ from the po$er analy0er meter o%ser'e the sending end 'oltage, Sending

#nd current and sending end po$er 3*F". Also o%ser'e the recei'ing end 'oltage

using a 'oltmeter.d. =o$ s$itch off the main +CB and ma-e the 'ariac 1 in 0ero position.

8. S(ort 0ircuit Test:a. =o$ short circuit the recei'ing end using the digital ammeter gi'en.

%. Then s$itch = the main +CB and CB1 and 'ary the sending end 'oltage

gradually till the sending end 'oltage is a%out 22) &olts and the recei'ing end

current is around !.7 A.

c. =o$ from the po$er analy0er meter o%ser'e the sending end 'oltage, Sending#nd current and sending end po$er 3*F". Also o%ser'e the recei'ing end

current from the ammeter used for short circuit the recei'ing end.

;. Ta%ulate the readings properly.

$ab %eport#

1. Calculate the ABCD parameters from the reading and comment.

2. &erify the results $ith the follo$ing euation AD:BC@1.

b!ective &: Study of =erranti effect for long transmission line and compensation for it

Procedures#

8


7/10

1. ollo$ the same procedures from 1stto 7 thstep as e/plained in the o%Oecti'e 1 to perform

the open circuit test. Along $ith po$er, 'alue of cos should also %e o%ser'ed.

2. Perform the open circuit test for follo$ing inductance and capacitance 'alue of the 4

sections 3say 6@!7m? and C@1.(d". =ote the 'oltage along the length of the line i.e. at

the end of each 4 section 3)*m".

!. Do the appropriate compensation for the transmission line so that recei'ing end 'oltage isnear to 22)&olts. =ote the 'oltage along the length of the line i.e. at the end of each 4

section 3)*m".

(. Ta%ulate the readings properly.

$ab %eport#

1. #/plain the erranti effect and causes for it.2. Plot 'oltage profile across the length of line $ith and $ithout compensation.

b!ective'#To determine t(e performance of t(e transmission line

a. #fficiency for different loading conditions $ithout compensation and $ith

compensation.

%. &oltage profile across the length of line on loading condition $ith and $ithout

compensation.

Procedures#

1. #nsure the necessary precautions stated earlier.

2. Connect all the fi'e 4 sections for ()) *m of line using connectors.

!. Select the 'alue of 1;m? for inductance and 1.(d of capacitance for each 4 sections.(. Connect the output of the sending end 'ariac using connector at 22) 'olt le'el of the

transformer.

7. Then connect the transmission line part $ith the 6C compensation part using $ire leads.

=o$ at the 6C compensation part connect the 'aria%le inductor from 56C unit 1 in shunt

$ith the line, through the po$er analy0er, to compensate the erranti effect and ma-e the

recei'ing end 'oltage to a%out 22)&. =ote the shunt compensation current, and *&A5

from the po$er analy0er.8. nce the line is compensated, s$itch off the CB1 and CB2 and connect the transmission

line to the recei'ing end Transformer and connect the load to the output of the recei'ing

end transformer through the po$er analy0er.;. =o$ s$itch on the CB1, CB2 and CB! and 'ary the loads in steps till the load is a%out

8)) $att. 3#nsure $hile 'arying the load the sending end 'oltage should %e -ept constant

at 22) &."

. %ser'e the sending end and recei'ing end 'oltage, current, po$er and po$er factor for

each loading condition.


8/10

1). =o$ s$itch off the CB1, CB2 and CB! and connect the 'aria%le capacitor from 56C unit

2 across the load at the recei'ing end through another po$er analy0er.

11. =o$ 'ary the capacitor and try to maintain the recei'ing end 'oltage at its rated 'oltage

for earlier loading conditions.

12. =o$ after compensation at each loading steps again ta-e the sending end and recei'ing

end 'oltage, current, po$er and po$er factor for each loading condition.1!. Also note the 'oltage along the length of line for ma/imum loading condition o%tained

after compensation.

1(. Ta%ulate the readings properly.

$ab %eport#

1. Calculate the efficiency for each loading condition $ithout and $ith compensation and

plot the efficiency 's load current for %oth the cases.

2. Calculate the 'oltage regulation for each loading condition $ithout and $ith

compensation and plot the 'oltage regulation 's. load current for %oth the cases.

!. Plot the 'oltage profile along the length of line $ithout compensation, $ith compensation

$hen done at the load end and $hen compensation $as done in %et$een the line together

$ith $hen done at recei'ing end condition for ma/imum loading condition.(. Dra$ the phasor diagram for ma/imum loading condition $ithout and $ith

compensation.

7.

$o)er !nalyCers

0T 0onnector

Transmission line

euivalent circuit

ariable "L0 Load

units


9/10

(onnection to use the power analy)er together with current transformer and potential

transformer

Documents

Exp4 Transmision Line