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jenis arester pada Gardu Induk

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					Pada gardu induk PT INALUM jenis arrester yang dipakai adalah : Type Rated voltage Nominal Discharge Current Capacitance of Special Operating Duty Test Weigth Merk = 50 F = 1080 kg. = THOSIBA CORPORATION. = Tekanan Relief (Pressure Relief) = 266 kV. = 10 kA.

Gambar 4.7. Arrester Type Pressure Relief

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IV.8.5. APLIKASI DARI GANGGUAN PADA TRANSMISI TEGANGAN TINGGI 275 kV PADA GARDU INDUK SIGURA-GURA.

Analisa gangguan A. Analisa sistem proteksi a. Indikasi dan relay yang bekerja : Pada TNP 1L / 2L : 44GI2 27GO2 CDG2 H1O Indikasi 44G & yang diulang.

Pada KTS 1L / 2L

: 44G2 – O1 (kembali Seperti yang diatas 44GI2 27GO2 H1O

Indikasi 44G, diulang dan mati terakhir.

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B. Analisa tabel waktu a. Waktu gangguan pada KTS 2024’56’’ b. Waktu gangguan pada TNP 2027’56’’ Pada TNP # 1L 1. Kesalahan arus pada kawat phasa (phasa –S) 960 A (rekam kesalahan) 1303.24 (Kalkulasi) Kesalahan arus pada kawat tanah (Io) 720 A (rekam kesalahan) 1936,44 A (Kalkulasi) # 2L 1. Kesalahan arus pada kawat phasa (phasa – S). 1560 A (rekam kesalahan) 1303,24 A (Kalkulasi) Kesalahan arus pada kawat tanah. 528 A (rekam kesalahan) 1936,44 (Kalkulasi)

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Pada KTS # 1L 1. Kesalahan pada kawat phasa (phasa – S). 1200 A (rekam kesalahan). 633,2 A (Kalkulasi). # 2L 1. Kesalahan arus pada kawat phasa (phasa – S) 720 A (rekam kesalahan). 633,2 A (Kalkulasi). Kesalahan arus pada kawat tanah. 2160 A (rekam kesalahan). 1936,44 A (Kalkulasi).

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IMPEDANCE MAP : 50 Hz, 275 Kv, 1000,0 MVA BASE (p.u)
SIGURAGURA POWER STATION J3,0227 0,00057 j0,00076 0,005 j0,0257 PUBLIC SECTOR (PLN) Z = 4,2248 Zo = 2,3905 AT PRESENT SYSTEM No. 4 MTr 386,1 M J1,7506 J0,00192 J0,00079 PLN LOAD J0,00079 PEAK : 646,0 MW OFF PEAK : 359,0 MW T : 2 x 40,0 MVA AVERAGE : 437,0 MW 154 / 275 Kv TOTAL GEN. CAP = % Z = 14,0 1300 MW J1,75 T : 182.0 MVA 262,5 + 25 / 33 kV % Z = 15,0 J0,8242 MAX. LOAD = 118 MW P.F = 87 %

G : 79,4 MVA 11 kV p.f = 0,9 Xd = 0,92 Xd’ = 0,24 Xd’’ = 0,17

T : 79,4 MVA 10,5 kV/287,5 kV 281,25 275,00 % Z = 13,9

2 TACSR 330 MM x 2 6,0 kM A = 1,0000 B = 0,02618 C = -0,00158 D = 1,0000

0,0954 J0,4878 J0,8242 J0,0150 J0,0150

No. 3 MTr

MAX. LOAD = 136 MW P.F = 87 % T : 182,0 MVA 262,5 + 25 / 33 Kv % Z = 15,0

2 TACSR 330 MM x 2 114,0 kM

2 TACSR 330 MM x 2 Line constant r = 0,063 Ohm/kM x = 1,03 mH/kM c = 0,01106 F- kM (at 110 0 C) 2

J2,9545

TANGGA POWER STATION 0,0005 J0,00067 338,9 M J0,00180 A = 0,9930 B = 0,4970 C = 0,0300 D = 0,9930 J0,6522 T : 182,0 MVA 262,5 + 25 / 33 Kv % Z = 15,0

No. 2 MTr STAND - BY

CABLE 200 MM Line constant r = 0,1113 Ohm/kM x = 0,1488 mH/kM c = 0,2000 F-kM (at 60 0 C)

G : 88,0 MVA T : 88,0 MVA J1,5454 11 kV 10,5 kV/287,5 p.f = 0,9 281,25 Xd = 0,97 275,00 Xd’ = 0,26 % Z = 13,6 Xd’’ = 0,17

J0,6522 T : 182,0 MVA 262,5 + 25 / 33 Kv % Z = 15,0

MAX. LOAD = 140 MW P.F = 87 %

KUALA TANJUNG SUB STATION

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PERHITUNGAN GANGGUAN TRANSMISI

S J0,0257

T J0,4878

K Z = J4,2248 Z = J2,3405

J0,0257

J0,4878 114 Km 14 Km

J1,7506

J1,545

SGP J3,0227 S J2,9545 T

TNP

KTS

A J0,4279 J0,0599

K

J0,01285 J1,1933 J1,545

J0,4279

J0,0599 J4,2248

SGP

TNP

KTS

AK =

14 x0,4878 114

j 0,0599

TA = 0,4878 – 0,0599 = j0,4279

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Urutan positif atau Urutan negatif
1,1933 0,01285 0,21345 0,02995

1,5

4,2248

GT = 1,1933 + 0,01285 = 1,206175 TT = 1,206175 x1,5 1,206175 1,5 1,8092625 2,70675
0,21395 A 4,2248

0,668426

0,668426

0,02995

B

C

0,882376 4,25478

AB = 0,882376 AC = 4,25475 Z12 = 0,882376 x 4,25475 0,882376 4,25475 3,754289 5,137126 0,730815

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Urutan Nol

S 0,01285

T 0,21395 A 0,02995

K

0,4375

0,51513

0,2525

2,3905

GT = 0,4375 + 0,01285 = 0,45035 TT = 0,240283.
0,240283 0,21395 A 0,2284 0,02995

B

C

0,454233 0,25835

AB = 0,454233 AC = 0,25835 Z0 = 0,164684

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Ia1 = Ia2 = Ia0 =

1 2 x0,730815 0,164684

0,6148874 pu.

If =1,844662 pu.
1000 x1000 2099,4 Ampere.

I bus =

3 x 275

If = 3872,87 Ampere. Ia1AB = Ia2AB = 4,25475 x0,6148874 (4,25475 0,882376) 0,50927 pu

Ia1AC = Ia2AC = 0,105616 pu. Ia0AB = 0,25835 x0,6148874 (0,454233 0,25835) 0,22293 pu

Ia0AC = 0,391957 pu. KTS Bus Va1 = 1 – Ia1 x Z1 Va1 = 1 – ( 0,6148874 x 0,730815) = 0,550631. Va2 = 1 – Ia2 x Z2 Va2 = - ( 0,6148874 x 0,730815) = - 0,449369. Va0 = 1 – Ia0 x Z0 Va0 = - (0,6148874 x 0,164684) = - 0,101621. Va1KTS = 0,550631 + (0,105616 x 0,02995) = 0,553794. Va2 = - 0,449369 + (0,105616 x 0,02995) = - 0,446206. Va0KTS = - 0,1012621 + (0,391957 x 0,02995) = - 0,089523.

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Va = 0,018065 pu = 2,87 kV. Ia = 0,603189 = 1266,40 Ampere. TNP Bus. Va1TNP = 0,550631 + (0,50927 x 0,21395) = 0,6595893 Volt. Va2TNP = - 0,449369 + (0,50927 x 0,21395) = - 0,34041068 Volt. Va0TNP = - 0,1012621 + (0,22293 x 0,21395) = - 0,05356623 Volt. Va = 0,2656124 pu = 42,17 kV. Ia = 1,24147 = 2606,47 Ampere. ITNPa12 = 0,50927 – 0,2822822 = 0,2269878 Ampere. ITNPa0 = 0,22293 – 0,11894387 = 0,10398613 Ampere. ITNP = 0,55796173 = 1171,44 Ampere. SGP Bus ISTa12 = 1,5 x0,50927 1,5 1,206175 0,2822822 Ampere.

ISTa0 =

0,51513 x0,22293 0,11894387 Ampere. 0,51513 0,45035

Va1SGP = 0,6595893 + (0,2822822 x 0,01285) = 0,6632166 Volt. Va2SGP = - 0,34041068 + (0,2822822 x 0,01285) = - 0,3367833 Volt. Va0SGP = - 0,05356623 + (0,11894387 x 0,01285) = - 0,0520378 Volt.

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Va0 = 0,274395526 pu = 43,57 kV. Ia = 0,68351 = 1435,03 Ampere.

Diagramarus dan tegangan 43,57 kV 42,17 kV 717,51 A 717,51 A 1435,03 A 1171,44 A 1303,24 A 1303,24 A 2,87 kV 633,2 A 633,2 A 3872,87 A KTS 1266,40 A

SGP

TNP

PLN

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