Voltage drop for common wire sizes for common currents encountered in instrumentation.
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PT. PLN (PERSERO) INDUK PEMBANGKIT DAN JARINGAN JAWA, BALI DAN NUSA TENGGARA
PEKERJAAN PAKET 7 PERALATAN PEMBANGKIT LISTRIK PLTA AMPELGADING
NOMOR KONTRAK :
219.PJ / 120 / PIKITRING JBN / 2007
JUDUL : VOLTAGE DROP AND CABLE SIZING STUDY
DISETUJUI
DIPERIKSA : KONSULTAN
TANGGAL :
PROKITRING
TANGGAL :
PIKITRING
TANGGAL :
PEKERJAAN PAKET 7 PERALATAN PEMBANGKIT LISTRIK PLTA AMPELGADING PT. PLN (PERSERO)
DATE:
30/05/08
REVISION:
A
PAGE:
2 of 9
VOLTAGE DROP AND CABLE SIZING PT.INDOKOMAS BUANA PERKASA
PPTL-AG-EL-CN-2001
TABULASI DARI HALAMAN YANG DIREVISI REVISI
HALAMAN A
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
X X X X X X X X X
B
C
0
CATATAN 1
2
3
PEKERJAAN PAKET 7 PERALATAN PEMBANGKIT LISTRIK PLTA AMPELGADING PT. PLN (PERSERO)
DATE:
30/05/08
REVISION:
A
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PPTL-AG-EL-CN-2001
DAFTAR ISI HALAMAN
1 2 3 4 5 6 7 8 9
COVER HALAMAN TABULASI DAFTAR ISI INTRODUCTION DESIGN CONDITION SAFETY CURRENT CAPACITY VOLTAGE DROP MINIMUM CONDUCTOR SIZE TABLE OF CABLE ELECTRICAL DATA EXAMINATION AND SAMPLE CALCULATION EXPLANATION OF CABLE SIZING TABLE CALCULATION OF CABLE SIZING
1 2 3 4 4 5 5 6 6 7 8 9
PEKERJAAN PAKET 7 PERALATAN PEMBANGKIT LISTRIK PLTA AMPELGADING PT. PLN (PERSERO)
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A
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PPTL-AG-EL-CN-2001
INTRODUCTION This document covers the selection of each power circuit corresponding to the rated current under consideration of short circuit current (minimum conductor size) and voltage drop depend on cable length, complying with the requirements of IEC-502 where applicable and related IEC standards corresponding to the insulation used and voltage level
2
DESIGN CONDITION In general condition, power cable conductor size will be determined in accordance with the following consideration. 2.1 Current rating Basic terms to be used for calculation as follows. (1) Ambient temperature in air……………………………………………. 40oC o (2) Ambient temperature in underground..………………………………. 30 C (3) Maximum continuous temperature for XLPE insulated power cable………………………………………. 90oC for PVC insulated power cable……………………………………….. 70oC (4) Maximum permissible temperature at short circuit for XLPE insulated power cable………………………………………. 250oC for PVC insulated power cable……………………………………….. 160oC (5) Derating factor (installation method)………...……………………... 0.7 (6) Total derating factor…………………………………………………... 0.64 Derating factor (installation method) x derating f actor (ambient tempeture)
PEKERJAAN PAKET 7 PERALATAN PEMBANGKIT LISTRIK PLTA AMPELGADING PT. PLN (PERSERO)
DATE:
30/05/08
REVISION:
A
PAGE:
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VOLTAGE DROP AND CABLE SIZING PT.INDOKOMAS BUANA PERKASA
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PPTL-AG-EL-CN-2001
CALCULATION FOR SAFETY CURRENT CAPACITY Formula of safety current capacity is as follow J = I x T x F …………………………………………………………….…….
Where : J I T F 4
(1)
: Safety current capacity : Current carrying capacity : Derating factor (ambient temperature) : Derating factor (installation method)
VOLTAGE DROP 4.1 Calculation formula of voltage drop is as follow (1) Three phase A.C circuit
ΔV = √3 x I x L x ( R cos φ + X sin φ ) …………………………………… ( 2 ) Where ; ΔV : Voltage drop (V) I : Circuit rated current (A) : A.C resistance of conductor at actual temperature (Ω /km) R : Reactance of conductor (Ω /km) X L : Cable length (km) CosØ : Power facto
PEKERJAAN PAKET 7 PERALATAN PEMBANGKIT LISTRIK PLTA AMPELGADING PT. PLN (PERSERO)
DATE:
30/05/08
REVISION:
A
PAGE:
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VOLTAGE DROP AND CABLE SIZING PT.INDOKOMAS BUANA PERKASA
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PPTL-AG-EL-CN-2001
MINIMUM CONDUCTOR SIZE The results which refer to the technical specification are summarized as follows.
6
Application
Minimum conductor size
20 kV system
35 sq-mm 95 sq-mm 150 sq-mm
6.6 kV system
500 sq-mm
400 V system
95 sq-mm
TABLE OF CABLE ELECTRICAL DATA The tables that containt of the electrical data for 12/20 kV XLPE insulated PVC sheathed power cables, 3.6/6 kV XLPE insulated PVC sheathed power cable, and 0.6/1 kV XLPE insulated PVC sheathed power cables which are conformed to IEC pub 502 are attached hereinafter
PEKERJAAN PAKET 7 PERALATAN PEMBANGKIT LISTRIK PLTA AMPELGADING PT. PLN (PERSERO)
DATE:
30/05/08
REVISION:
A
PAGE:
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VOLTAGE DROP AND CABLE SIZING PT.INDOKOMAS BUANA PERKASA
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PPTL-AG-EL-CN-2001
EXAMINATION AND SAMPLE CALCULATION The sample calculation shall be shown below. 7.1 From Generator to 6.6 kV Switchgear ( 1 ) Calculation data Capacity of load Voltage Rated current Derating factor (installation method) Derating factor (ambient temperature) Total derating factor Power factor ( 2 ) Cable data Length Resistance Reactance Cable cross section Current carrying capacity ( 3 ) Study of safety current capacity J ═ I x T x F ═ 877 x 0.91 x 0.7 ═ 558.6 ( A ) > 529.9 ( A )
6050 kVA 6600 V 529.9 A 0.7 0.91 0.64 0.8
40 0.05 0 500 877
m
Ω /km Ω /km sqmm A
OK
8
EXPLANATION OF CABLE SIZING TABLE CALCULATION OF CABLE SIZING
POWER : Load kVA VOLTAGE RATED CURRENT : Required load current SAFETY CURRENT : J = I x T x F POWER FACTOR TOTAL DERATING FACTOR = DERATING FACTOR (INSTALLATION METHOD) x DERATING FACTOR (AMBIENT TEMPERATURE) KIND OF CABLE NUMBER OF CONDUCTOR FOR EACH PHASE NUMBER OF PHASE IN THIS CIRCUIT NUMBER OF CABLE CORE CABLE SIZE : If (4) > (3) and (20) > (18), this cable size is satisfied CABLE CURRENT CARRYING CAPACITY CABLE RESISTANCE CABLE REACTANCE DESIGN LENGTH OF THE CABLE ALLOWABLE CABLE LENGTH VOLTAGE DROP OF THIS CABLE ( V ) VOLTAGE DROP OF THIS CABLE ( % ) ALLOWABLE VOLTAGE DROP ( V ) ALLOWABLE VOLTAGE DROP ( % )
CORE
1 (10)
LENGTH ALLOWA
SIZE
CCC
R
X
DESIGN
(SQMM)
(A)
Ω/km
Ω/km
(M)
500 (11)
877 (12)
0.05 (13)
40 (14)
(15)
(M)
7200 (16)
VOLTAGE DROP ALLOWABLE
CABLE (V)
1.5 (17)
(%)
0.02 (18)
(V)
(%)
264 (19)
4 (20)
9 CALCULATION OF CABLE SIZING CALCULATION OF CABLE SIZING SAFETY NO.
