Station Asset Name Transformer Make Type Serial Number Phase Vector Group
Khaburah Earthing Transformer - 1 CGL ONAN 315 EV9140/1 1999 33 415 5.51 420 3 50 5 4.08 46.2 Z N y n 11 40 50 50
Khaburah Earthing Transformer - 2 CGL ONAN 315 EV9140/2 1999 33 415 5.51 420 3 50 5 3.98 46.2 Z N y n 11 40 50 50
Liwa Earthing Transformer - 1 Voltamp ONAN 315 9915797 2008 33 415 5.51 438.2 3 50 5 3.78 37.39" Z N y n 11
Liwa Earthing Transformer - 2 Voltamp ONAN 315 9915829 2008 33 415 5.51 438.2 3 50 5 3.79 38.6' Z N y n 11
Saham Earthing Transformer - 1 Voltamp ONAN 315 9916685 2008 IEC 60076 / IEC 289 33 415 5.51 438.2 3 50 5 42.32 40 50 50
Saham Earthing Transformer - 2 Voltamp ONAN 315 9916725 2008 IEC 60076 / IEC 289 33 415 5.51 438.2 3 50 5 38.91 40 50 50
Shinas Earthing Transformer - 1 France Transfo ONAN 200 3412 - 02 1987 33 415 3.51 500 3 50 18.4 ZNyn11
Shinas Earthing Transformer - 2 France Transfo ONAN 200 3412 - 01 1987 33 415 3.51 500 3 50 18.4 ZNyn11
SIA Earthing Transformer - 1 Voltamp ONAN 750 9912764 2006 33 415 13.12 1043.4 4.69 18.31 ZNyn11 40 50 50
SIA Earthing Transformer - 2 Voltamp ONAN 750 9912763 2006 33 415 13.12 1043.4 4.68 18.44 ZNyn11 40 50 50
SIS Earthing Transformer - 1 ET & SL ONAN 750 11000011 01 2005 IEC 60076 - 1…5 13.12 1043.4 3 50 5 1950 3541 24.06 ZNyn11 40 50 50
SIS Earthing Transformer - 2 ET & SL ONAN 750 11000011 02 2005 IEC 60076 - 1…5 3 50 5 1970 3590 24.24 ZNyn11 40 50 50
Sohar Main Earthing Transformer - 1 Pauwels 0SS - 28.58 / AC 70 ONAN 315 9415777 1995 BS 4944 / 171 33 415 5.51 420 3 50 5 3.94 45
Sohar Main Earthing Transformer - 2 Pauwels 0SS - 28.58 / AC 70 ONAN 315 9415778 1995 BS 4944 / 171 33 415 5.51 420 3 50 5 3.94 43.98
Mahada Earthing Transformer - 1 ET & SL ONAN 500 1110201 2005 IEC 60076 - 1…5 3 50 5 2025 1720 3.28 24.96 Z N y n 11 40 50
Mahada Earthing Transformer - 2 ET & SL ONAN 500 1110202 2005 IEC 60076 - 1…5 3 50 5 2051 1736 3.29 25.29 Z N y n 11 40 50
Buraimi Earthing Transformer - 1 ET & SL ONAN 315 11103 - 01 2005 IEC 60076 33 415 5.51 438.2 3 50 5 2700 2800 3.34 14.21 Z N y n 11 40 50 50
Buraimi Earthing Transformer - 2 ET & SL ONAN 315 11103 - 02 2005 IEC 60076 33 415 5.51 438.2 3 50 5 2760 2780 3.26 13.92 Z N y n 11 40 50 50
Al Hail Earthing Transformer 1 Stomberg KTMP36NC1610 ONAN 200 5172062 1986 IEC 76 IEC 289 3 50 Z N y n 11 40 50
Al Hail Earthing Transformer 2 CGL ONAN 200 2003 33 435 265.4 3 50 5 44.5 Z N y n 11 40 50
Dank Earthing Transformer - 1 ABB TRANSMIT KTRM 36 NC 1475 ONAN 200 5208064 1997 IEC 289 33 433 3.449 266.7 3 50 39.8 2 Z N y n 11 40 50
Dank Earthing Transformer - 2 ABB TRANSMIT KTRM 36 NC 1475 ONAN 200 5208063 1997 IEC 289 33 3.51 500 3 50 40 2 Z N y n 11 40 50
Ibri Earthing Transformer - 1 Stomberg KTMP 36X 7101. ONAN 200 5170377 1986 IEC 289 33 435 3.5 265.4 3 50 29.6 Z N y n 11
Ibri Earthing Transformer - 2 Stomberg KTMP36NC1610. ONAN 200 5172063 1986 IEC 76 IEC 289 33 435 3.5 265.4 3 50 40.2 Z N y n 11
Adam Earthing Transformer - 1 EMCO Limited ONAN 315 2954 2008 33 415 5.5 438.2 3 50 5 4.0344 83.218 Z N y n 11 40 50 55
Adam Earthing Transformer - 2 EMCO Limited ONAN 315 2955 2008 33 415 5.5 438.2 3 50 5 4.0123 81.227 Z N y n 11 40 50 55
Bahala Earthing Transformer - 1 Pauwels OSS 28.58/70 ONAN 315 9417180 1995 BS4944/171 33 433 5.51 420 3 50 3.96 44.94 Z N y n 11 55
Bahala Earthing Transformer - 2 Voltamp ONAN 750 9917778 2009 IEC : 60076 / IEC 289 33 433 13.12 1043.4 3 50 4.77 19.05 Z N y n 11 50
Iski Earthing Transformer - 1 Pauwels OSS 28.58/70 ONAN 315 9417182 1995 BS4944/171 33 433 5.51 420 3.99 Z N y n 11 40 50 55
Iski Earthing Transformer - 2 Pauwels OSS 28.58/70 ONAN 315 9417183 1995 BS4944/171 33 433 5.51 420 3.99 Z N y n 11 40 50 55
Iski Earthing Transformer 3 Stomberg KTMM 39 X 5200 ONAN 160 3161289 1984 IEC 289 33 433 2.8 213.4 57.6 Z N y n 11 40 50 55
Nizwa Earthing Transformer - 1 Pauwels OSS 28.58/70 ONAN 315 9417184 1995 BS4944/171 33 433 5.51 420 3 50 3.94 44.05 Z N y n 11 40 50 55
Nizwa Earthing Transformer - 2 Pauwels OSS 28.58/70 ONAN 315 9417185 1995 BS4944/171 33 433 5.51 420 3 50 3.94 45 Z N y n 11 40 50 55
Samail Earthing Transformer - 1 CGL ONAN 315 EV9539/1 2002 33 415 5.51 438.2 3 50 5 4.59 42.3 Z N y n 11 40
Samail Earthing Transformer - 2 CGL ONAN 315 EV9539/2 2002 33 415 5.51 438.2 3 50 5 4.58 42.06 Z N y n 11 40
JBB Ali Earthing Transformer 1 ET & SL ONAN 315 1156502 2001 IEC 76-1....5 33 415 5.51 438.23 5 2570 2849 3.37 Z N y n 11 40 50
JBB Ali Earthing Transformer 2 ET & SL ONAN 315 1156504 2001 IEC 76-1....5 33 415 5.51 438.23 5 2570 2789 3.36 Z N y n 11 40 50
Mudhaibi Earthing Transformer 1 ET & SL ONAN 315 1156601 2001 IEC - 76 - 1…5 33 415 5.51 438.23 5 1840 2586 3.99 Z N y n 11
Mudhaibi Earthing Transformer 2 ET & SL ONAN 315 1156602 2001 IEC - 76 - 1…5 33 415 5.51 438.23 5 1840 2586 4.01 Z N y n 11
Mudairib Earthing Transformer 1 ET & SL ONAN 315 1156506 33 415 5.51 438.23 5 2530 2796 3.36 Z N y n 11 40 50
Mudairib Earthing Transformer 2 ET & SL ONAN 315 1156505 33 415 5.51 438.23 5 2560 2806 3.35 Z N y n 11 40 50
Sur Earthing Transformer 1 ET & SL ONAN 315 1156503 IEC 76 - 1.5 33 415 5.51 438.23 5 2580 2835 3.35 Z N y n 11 40 50
Asset ID
Type of Cooling
Capacity (KVA)
Year of Manuf
Earthing TX Ref Standard
Voltage HV (KV)
LV
(V)
Current HV
(A)
LV
(A)
Freq. (Hz)
No of Tap
No Load Loss (W)
Load Loss ( W)
Impedance voltage at 75 º C &
rated Tap. (%)
Zero Sequence Impedance
Temp Rise in Oil (c")
Temp. Rise in Wind
(c")
Ambient Temp. (c")
IEC : 289 -1988 , IEC : 76
Sur Earthing Transformer 2 ET & SL ONAN 315 1156501 IEC 76 - 1.5 33 415 5.51 438.23 5 2520 2835 3.35 Z N y n 11 40 50
Airport height Earthing Transformer 1 ET & SL ONAN 500 19010793 / 01 2009 IEC 60076 33 415 8.75 695.6 3 50 5 2856 1309 1.99 14.1 Z N Y n 11 40 50 50
Airport height Earthing Transformer 2 ET & SL ONAN 500 19010793 / 02 2009 IEC 60076 33 415 8.75 695.6 3 50 5 2842 1318 1.98 13.98 Z N Y n 11 40 50 50
Al Falaj Earthing Transformer 1 Voltamp ONAN 315 9918649 2010 IEC 60076 / IEC 289 33 415 5.51 438.2 3 50 5 3.94 41.09 Z N Y n 11 40 50 50
Al Falaj Earthing Transformer 2 Fuji Electric ONAN 250 AC95384T701 1980 IEC 76 33 415 4.37 500 3 50 5 0.98 32.3 Z N Y n 11 50 55 50
Azaiba Coast Earthing Transformer - 1 ET & SL ONAN 500 19010792 / 01 2009 IEC 60076 11 415 26.23 695.6 3 50 5 1020 4031 6.53 7.03 Z N Y n 11 40 50 50
Azaiba Coast Earthing Transformer - 2 ET & SL ONAN 500 19010792 / 02 2009 IEC 60076 11 415 26.23 695.6 3 50 5 1015 4062 6.5 7.03 Z N Y n 11 40 50 50
Azaiba Coast Earthing Transformer - 3 ET & SL ONAN 500 19010792 / 03 2009 IEC 60076 11 415 26.23 695.6 3 50 5 1017 4023 6.45 7.01 Z N Y n 11 40 50 50
Boushar Earthing Transformer 1 CGL ONAN 315 EV 9540 / 1 2002 IEC 60076 / IEC 289 33 415 5.51 438.2 3 50 5 4.41 42.288 Z N y n 11 40 50 50
Boushar Earthing Transformer 2 CGL ONAN 315 EV 9540 / 2 2002 IEC 60076 / IEC 289 33 415 5.51 438.2 3 50 5 4.39 42.09 Z N y n 11 40 50 50
Boushar Earthing Transformer 3 Voltamp ONAN 315 9919890 2011 IEC 60076 / IEC 289 33 415 5.51 438.2 3 50 5 3.85 41.92 Z N y n 11 40 50 50
Ghubrah PS Earthing Transformer Voltamp Earthing Transformer ONAN 315 9918623 2010 IEC 76 33 433 5.51 438.2 3.93 42.43 Z N y n 11 40 50
Jahloot Earthing Transformer 1 CGL ONAN 315 EV 9208 / 1 1999 IEC 289 - 1988 33 415 5.51 438.2 3 50 5 4.01 43.95 Z N y n 11 40 50 50
Jahloot Earthing Transformer 2 CGL ONAN 315 EV 9208 / 2 1999 IEC 289 - 1988 33 415 5.51 438.2 3 50 5 3.84 44.52 Z N y n 11 40 50 50
MSQ Earthing Transformer 1 N.I ONAN 200 212871360 1988 33 415 3.5 278.24 2.48 43.73 Z N y n 11
MSQ Earthing Transformer 2 N.I ONAN 200 212871361 1988 33 415 3.5 278.24 2.49 43.02 Z N y n 11
MSQ Earthing Transformer 3 Voltamp ONAN 315 9919280 2010 IEC 60076 / IEC 289 33 415 5.51 420 3 50 5 3.87 41.28 Z N y n 11 45 50 50
Mawaleh Earthing Transformer 1 CGL ONAN 315 EV 9224 / 1 1999 IEC 289 - 1988 33 415 5.51 438.2 3 50 5 4.03 Z N y n 11 50 55
Mawaleh Earthing Transformer 2 CGL ONAN 315 EV 9224 / 2 1999 IEC 289 - 1988 33 415 5.51 438.2 3 50 5 4.06 Z N y n 11 50 55
Mawaleh Earthing Transformer 3 Voltamp ONAN 315 9919366 2010 IEC 60076 / IEC 289 33 415 5.51 438.2 3 50 5 3.8 41.67 Z N y n 11 40 50 50
Rusail PS Earthing Transformer 1 BONAR LONG Ltd 07 / 82 / 1912 1983 BS 171 - 1978 33 415 50 61.79 Z N y n 11
Rusail PS Earthing Transformer 2 BONAR LONG Ltd 07 / 82 / 1913 1983 BS 171 - 1978 33 415 50 61.82 Z N y n 11
Rusail PS Earthing Transformer 3 STEM 6590/1 1987 33 415 50
Rusail PS Earthing Transformer 4 STEM 6590/2 1987 33 415 50
Seeb Main Earthing Transformer-3 Stromeberg KTMM 36 X 5200 ONAN 160 5161290 1984 IEC 289 33 433 2.8 213.4 3 50 5 901 807 2.5 57.6 Z N yn 11 50 55 55
Wadi Adai Earthing Transformer 1 Fuji Electric ONAN 315 AJ69080 T3-1 1984 IEC 76 / BS 4944 33 415 5.51 438 3 50 5 1.8 15.39 50 55
Wadi Adai Earthing Transformer 2 Fuji Electric 315 AJ69080 T3-2 1984 IEC 76 / BS 4944 33 415 5.51 438 3 50 5 1.8 15.29 50 55
Wadi Kabir Earthing Transformer 1 Brown Boveri GBAS1-2000 ONAN 200 WBB42473 1987 IEC 76 33 433 3.5 267 Z N yn 11 50 55
Wadi Kabir Earthing Transformer 2 Brown Boveri GBAS1-2000 ONAN 200 WBB42474 1987 IEC 76 33 433 3.5 267 3 50 5 Z N yn 11 50 55
Wadi Kabir Earthing Transformer 3 Voltamp ONAN 315 9919363 2010 IEC 60076 / IEC 289 33 415 5.51 438.2 3 50 5 3.76 40.82 Z N yn 11 40 50 50
Barka Main Earthing Transformer - 1 Stromberg KTCM 36X 7100 ONAN 200 5168079 1986 IEC 289 33 433 3.5 266.7 3 50 1904 723 1.4 21.1 ZNyn11 50 55
Barka Main Earthing Transformer - 2 Stromberg KTCM 36X 7100 ONAN 200 5168077 1986 IEC 289 33 433 3.5 266.7 3 50 1917 723 1.4 21.1 ZNyn11 50 55
Filayj Earthing Transformer - 1 ET & SL ONAN 750 1164101 2002 IEC 60076 - 1....5 33 433 13.12 1000.03 3 50 5 1868 3711 ZNyn11 40 50 50
Filayj Earthing Transformer - 2 ET & SL ONAN 750 1164102 2002 IEC 60076 - 1....5 33 433 13.12 1000.03 3 50 5 1863 3646 ZNyn11 40 50 50
MIS Earthing Transformer - 1 ET & SL ONAN 750 1100001103 2005 IEC 60076 - 1…5 433 1000.03 3 50 5 1970 3511 4.98 ZNyn11 40 50
MIS Earthing Transformer - 2 ET & SL ONAN 750 1100001104 2005 IEC 60076 - 1…5 433 1000.03 3 50 5 1940 3545 4.98 ZNyn11 40 50
Mulladah Earthing Transformer - 1 N.I. ONAN 200 202903023 1991 BS 171 :1978 33 415 3.5 278.2 3 50 5 1.72 31.5 ZNyn11
Mulladah Earthing Transformer - 2 N.I. ONAN 200 202903024 1991 BS 171 :1978 33 415 3.5 278.2 3 50 5 1.72 31.5 ZNyn11
Rustaq Earthing Transformer - 1 CGL ONAN 315 MT5470 / 2 2005 33 415 5.51 438.2 3 50 5 4.27 42.59 ZNyn11 40 50 50
Rustaq Earthing Transformer - 2 CGL ONAN MT5470 / 1 2005 33 415 5.51 438.2 3 50 5 4.26 43.64 ZNyn11 40 50 50
Insulation Level HV LV OTI Make Model SI No
LI 170 AC 70 LI - AC 3 2985 2610 4640 10160 Perfect Control PC414 M4433/5
LI 170 AC 70 LI - AC 3 2985 2610 4640 10160 Perfect Control PC414 M4362/5
HV 170 AC 75 LV LI - AC 3 1860 1580 3310 6200 Precimeasure Control 1002 08 - 881 / 22 1500 /30
HV LI 170 AC 75 LV LI - AC 3 1860 1580 3310 6200 Precimeasure Control 1002 08 - 881 / 9 1500 /30
L1 170 AC 75 L1 AC 3 1860 1580 3310 6200 Precimeasure Control 1002 08-1633/9 1500 /30
L1 170 AC 75 L1 AC 3 1860 1580 3310 6200 Precimeasure Control 1002 08-1633/19 1500 /30
170 / 70 KV 2.5 KV 1150 6135
170 / 70 KV 2.5 KV 1150 6135
HV LI 170 AC 75 LV LI - AC 3 2430 2065 5300 9650 3000
HV LI 170 AC 75 LV LI - AC 3 2430 2065 5300 9650 3000
2570 2210 7750 3200 7750 34650 33825 33000 32175 31350 12.5 12.8 13.12 13.46 13.81
2570 2210 7750 3200 7750 34650 33825 33000 32175 31350 12.5 12.8 13.12 13.46 13.81
LI 170 / AC 70 1975 2770 6390 1500 /30
LI 170 / AC 70 1975 2770 6390 1500 /30
LI 170 AC 75 LI - AC 3 2570 2150 720 3100 7200 333.3 / 30 34650 33825 33000 32175 31350 415 12.5 12.8 13.12 13.46 13.81
LI 170 AC 75 LI - AC 3 2570 2150 720 3100 7200 333.3 / 30 34650 33825 33000 32175 31350 415 12.5 12.8 13.12 13.46 13.81
LI.170.AC75 A/C3 2120 1820 8000 4150 8000 500 / 30
LI.170.AC75 A/C3 2120 1820 8000 4150 8000 500 / 30
L1 170 AC 70 / AC8 KV 1000 4500
LI 170AC70 / LI - AC3 IEC 296 3320 2905 9500 2770 9200 Perfect Control PC 414 M6361/55
L1 170 AC 70 / AC8 KV 910 4700
L1 170 AC 70 / AC8 KV 910 4700
LI 170 AC 70/AC8 KV 1100 5000
LI 170 AC 70/AC8 KV 1100 4500
LI 170KV AC 70 KV 1750 1400 2300 5100 700 / 30
LI 170KV AC 70 KV 1750 1400 2300 5100 700 / 30
LI 170/AC 70 LI - AC 30 1975 2770 6350 1500 /30
HV LI 170 AC 75 LI - AC 30 2430 2065 6300 9650 3000 /30
LI 170/AC 70 LI-/AC 3 max-25 X Inom /max 3 sec 1975 2770 6350
LI 170/AC 70 LI-/AC 3 max-25 X Inom /max 3 sec 1975 2770 6350
LI 170 AC 70 / AC8 890 2800 AB KIHLSTROMS 8669
LI 170/AC 70 1975 2770 6350 1500 / 3
LI 170/AC 70 1975 2770 6350 1500 / 3
LI170 AC / LI – AC 3 IEC 296 3520 3080 10700 3665 10500 Perfect Control PC 414 M5885 / 45 33000 415 5.51
LI170 AC / LI – AC 3 IEC 296 3520 3080 10700 3665 10500 Perfect Control PC 414 M5885 / 28 33000 415 5.51
L1 170 AC 70 L1 AC-3 2115 1850 8100
L1 170 AC 70 L1 AC-3 2115 1850 8100
830 1600 6400 3350 6400
830 1600 6400 3350 6400
L1 170 AC 70 / L1 - AC 3 2115 1850 8100 4400 8100
L1 170 AC 70 / L1 - AC 3 2115 1850 8100 4400 8100
L1 170 AC 70 2115 8100 4400 8100
Type of Oil
Oil Volume (Ltrs)
Oil weight
(KG)
Core & Winding weight
(KG)
Transport Mass (KG)
Untanking Mass
(KG)
Total weight
(KG)
Earth fault Current (A / Sec)
Rated Voltage (HV)
@ tap position1
(V)
Rated Voltage (HV)
@ tap position 2
(V)
Rated Voltage (HV)
@ tap position 3(V)
Rated Voltage (HV)
@ tap position 4
(V)
Rated Voltage (HV)
@ tap position 5
(V)
Rated Voltage LV
Rated Current (HV)
@ tap position 1
(A)
Rated Current (HV)
@ tap position 2
(A)
Rated Current (HV)
@ tap position 3
(A)
Rated Current (HV)
@ tap position 4(A)
Rated Current (HV) @
tap position
5 (A)
L1 170 AC 70 2115 8100 4400 8100
L1 170 AC 70 L1 - AC 3 2700 2330 8800 4000 8500 500 / 30
L1 170 AC 70 L1 - AC 3 2700 2330 8800 4000 8500 500 / 30
HV LI - 170 AC 75 LV LI - AC 3 1860 1580 3310 6200 Precimeasure Control 1002 09 - 12403 / 10 1500
HV Line BIL - 170 KV 3500 5100 10200
1100 950 1750 4100
1100 950 1750 4100
1100 950 1750 4100
3520 3080 10700 3665 10500 Perfect Control PC 414 M5885/46 1500
3520 3080 10700 3665 10500 Perfect Control PC 414 M5885/15 1500
1860 1580 3310 6200 Precimeasure Control 1002 09-4427/17 1500 /30
LI 170 AC 75 LI - AC 3 1860 1580 3310 6200 Precimeasure Control 1002 09-12403/11 1500/ 3
LI 170 AC 70 / LI - AC 3 IEC 296 2985 2610 4640 10160 Perfect Controls PC 414 M4538 / 3
LI 170 AC 70 / LI - AC 3 IEC 296 2985 2610 4640 10160 Perfect Controls PC 414 M4537 / 3
170 KVp 1475 1270 2245 4600 4600 Accurate Controls A131 9341 1 1525/10
170 KVp 1475 1270 2245 4600 4600 Accurate Controls A131 9341 2 1525/10
HV LI - 170 AC 75 LV LI - AC 3 1860 1580 3680 6700 Precimeasure Control 1002 09-9871/16 1500 /30
LI 170 AC 70 / LI - AC 3 3325 2890 5420 11290 Perfect Control PC 414 M 4608 / 1 1500 /30
LI 170 AC 70 / LI - AC 3 3325 2890 5420 11290 Perfect Control PC 414 M 4567 / 1 1500 /30
LI - 170 AC 70 LI - AC 3 1860 1580 3310 6200 Precimeasure Control 1007 10-3830/1 1500
1382 1190 1970 4100
1382 1190 1970 4100
36 / 70 / 170 KV 450 1640 2650
36 / 70 / 170 KV 450 1640 2650
L1 170 AC 70 / AC 8 890 2800 1500 /30
2300 4400 9500 1500 /30
2300 4400 9500 1500 / 2
1210 5050 1500 / 2
1210 5050
LI - 170 AC 75 LI - AC 3 1860 1580 3310 6200 Precimeasure Control 1007 10-3830/6 1500
L1 170 AC 70 AC / AC3 1000 4300 AB KIHLSTROMS 53224
L1 170 AC 70 AC / AC3 1000 4300 AB KIHLSTROMS 53225
L1 170 AC 75 / L1 - AC 3 2250 7750 3300 7750
L1 170 AC 75 / L1 - AC 3 7750 3300 7750
LI 170 AC 75 LI - AC 3 2570 2210 7750 3200 7750 33650 33825 33000 32175 31350 12.5 12.8 13.12 13.46 13.81
LI 170 AC 75 LI - AC 3 2570 2210 7750 3200 7750 33650 33825 33000 32175 31350 12.5 12.8 13.12 13.46 13.81
170 KVp 2240 3300 7750 7540 Accurate Control A131 110381
170 KVp 2240 3300 7750 7540 Accurate Control A131 110382
L1 170 AC 70 / L1 - AC3 3080 10500 3665 10500 Perfect Controls PC 414 M 8605 / 5
L1 170 AC 70 / L1 - AC3 3080 10500 3665 10500 Perfect Controls PC 414 M 8605 / 2
170 KV 1.2 / 50 µS Full Wave
170 KV 1.2 / 50 µS Full Wave
CT 1 Type CT-1 Ratio (A) CT -1Class Purpose CT 2 Type
600 / 1 15 5P10 2400 / 1 X 300 < 15
601 / 1 15 5P10 2401 / 1 X 300 < 15
4
4
4 LV Neutral 1200 / 1 15 5P20 ≤ 5 HV Phase CT 500 / 1 10 5P20
4 LV Neutral 1200 / 1 15 5P20 ≤ 5 HV Phase CT 501 / 1 10 5P20
3 LV NCT 1200/1 15 5P15 HV phase CT 30/1 15 5P15
3 LV NCT 1200/1 15 5P15 HV phase CT 30/1 15 5P15
1000.03 .
1000.03
1000.03 2 NCT 30 / 1 - 1 10 5P15 30 / 1 - 1 X ≥ 250 ≤20 ≤ 1 1600 / 1 - 1 X
1000.03 2 NCT 30 / 1 - 1 10 5P15 30 / 1 - 1 X ≥ 250 ≤20 ≤ 1 1600 / 1 - 1 X
Stromberg KOK / E 36 5037228 1S1 - 1S2 800/1 0:00 10P10 2S1 - 2S2 800/1 X
5038588 K0K/E 36 300/1 10 5P10 1200/1 10 5P10 300/1 10 3
5038587 K0K/E 36 300/1 10 5P10 1200/1 10 5P10 300/1 10 3
ASEA ------ ------
Stromberg KOK / E 36 5037228 1S1 - 1S2 800/1 10 10P10 1200 / 1 10 10P10
800 - / 1 15 5P15 >41(Rct+2) 800 - / 1 10 5
800 - / 1 15 5P15 >41(Rct+2) 800 - / 1 10 5
1200/1 15 5P15 30/1 15 5P15
KOK / E36 5036968 1S1-1S2 1200/1 X 2S1-2S2 500 / 1 15 5P10
438.2 2 500 /1 15 5P10 1600 /1 CL X
438.2 2 500 /1 15 5P10 1600 /1 CL X
2 V.M. Electricals N - 2 / 01 / 3 - 94 2400 / 1 X 1500 / 1 5P15
2 V.M. Electricals N - 2 / 01 / 3 - 94 2400 / 1 X 1500 / 1 5P15
2 V.M. Electricals N - 2 / 01 / 3 - 94 2400 / 1 X 1500 / 1 5P15
2 V.M. Electricals N - 2 / 01 / 3 - 94 2400 / 1 X 1500 / 1 5P15
2 V.M. Electricals N - 2 / 01 / 3 - 94 2400 / 1 X 1500 / 1 5P15
2 V.M. Electricals N - 2 / 01 / 3 - 94 2400 / 1 X 1500 / 1 5P15
2 V.M. Electricals N - 2 / 01 / 3 - 94 2400 / 1 X 1500 / 1 5P15
Rated Current LV
No. Of CT
Rated Standard
Location of CT -1
CT 1 Makers Name
CT 1 Model No
Core 1 Connection Terminals
CT-1 Burden
(VA)
CT -1 Knee Point Voltage( V
k)
CT- 1 Exciting
Current Ie
CT -1 Secondary
Winding Resistance
Rct (Ohm)
CT-1 Core 2
Ratio (A)
CT-1 Core 2 Burden
(VA)
CT-1 Core 2 Accuracy
Class
CT -1 /Core 2 Knee Point
Voltage ( V)
CT -1 /Core 2Exciting Current Ie
CT -1 /Core 2
Secondary Winding
Resistance Rct (Ohm)
CT-1 Core
2 ALF
Location of CT No.2
CT 2 Makers Name
CT 2 Model No
CT 2 Core 1
Connection
CT 2 Core 1 Ratio
(A)
CT-2 Burden
(VA)
CT 2 Core 1 Accuracy
Class
2 V.M. Electricals N - 2 / 01 / 3 - 94 2400 / 1 X 1500 / 1 5P15
4 1200 /1 15 5P15 2400 / 1 PX
4 1200 /1 15 5P15 2400 / 1 PX
HV NEUTRAL 1200 / 1 X ≥ 350 ≤ 11 ≤ 16 1500 / 1 10 5P20 ≤ 6
3 1000 / 1 20 5P 15 3200 /1 PX
3 1000 / 1 20 5P 15 PX
3 1000 / 1 20 5P 15 PX
500 / 1 15 5P10 2400/1 X
500 / 1 15 5P10 2400/1 X
500 / 1 15 5P20 2.5 1200 / 1 15 5P20 8 2400/1 X
4 HV Neutral 1500 /1 10 5P20 6 HV Neutral 800 / 1 X
500 / 1 15 5P20 3 2400 /1 300 15 7
500 / 1 15 5P20 3 2400 /1 300 15 7
LVN 1200 / 1 15 5P20 500 / 1 15 5P15 2400 / 1 X
500 / 1 15 5P20 2400 /1 X
500 / 1 15 5P20 2400 /1 X
LVN 800 / 1 15 5P15 ≤ 6 HV phase 500 / 1 15 5P15
2 1600 / 1 600 / 1
2 1601 / 1 600 / 1
KOK / E36 5036969 1S1 - 12 1200 / 1 X 500 / 1 15 5P10
1500 / 1 10 5P20 2500 / 1 45 5P20
1500 / 1 10 5P20 2500 / 1 45 5P20
LV NEUTRAL 800 / 1 15 5P15 ≤ 6 1500 / 1 15 5P15 2500 / 1 45 5P20
3 NCT 30 / 1 - 1 15 5P15 30 / 1 - 1 X ≥ 240 ≤11 ≤ 3.1 30 / 1 - 1 10 5P20
3 NCT 30 / 1 - 1 15 5P15 30 / 1 - 1 X ≥ 240 ≤11 ≤ 3.1 30 / 1 - 1 10 5P20
2 1000 / 1 15 5P15
2 1000 / 1 15 5P15
CT 3 Type Purpose Duty
≤ 4 2400 / 1 HV Neutral CT 1 X ≥ 280 ≤ 10 ≤ 12
≤ 4 2400 / 1 HV Neutral CT 1 X ≥ 280 ≤ 10 ≤ 12
2400 / 1 HV NCT X 1500 / 1 15 ≤ 5
2400 / 1 HV NCT X 1500 / 1 15 ≤ 5
≥ 300 ≤30 ≤5 1600 / 1 - 1 X ≥250 ≤30 ≤5
≥ 300 ≤30 ≤5 1600 / 1 - 1 X ≥250 ≤30 ≤5
1200 / 1 X 3S1 - 3S2 800/1 10 3
<20 1200/1 10 3 300/1 X
<20 1200/1 10 3 300/1 X
3S1 - 3S2 800/1 10 3 1200 / 1 10 3
2400 / 1 ≥ 400 ≤ 20 ≤ 5 1500 / 1 15 5P15 ≤ 5
≥ 250 ≤ 50 ≤ 9.0
≥ 250 ≤ 50 ≤ 9.0
Stand by earth Fault
Stand by earth Fault
Stand by earth Fault
CT 2 Core 1 Knee Point
Voltage (V)
CT- 2 Exciting
Current Ie (mA)
CT -2 Secondary
Winding Resistance Rct (ohm)
Core 2 Duty
CT 2 Core 2
Connection
CT 2 Core 2 Current
Ratio
CT 2 Core 2 Rated
Burden (VA)
CT 2 Core 2 Accuracy
Class
CT 2 Core 2 Knee Point
Voltage
CT- 2 Exciting
Current Ie
CT -2 Secondary
Winding Resistance Rct (ohm)
Location of C.T. No.3
CT 3 Makers Name
CT 3 Model No
CT No.3 Connectio
n Terminals
CT-3 Ratio (A)
CT-3 Burden (VA)
CT -3 Class
CT -3 Knee Point Voltage Vk
CT- 3 Exciting
Current Ie
CT -3 Secondary
Winding Resistance
Rct
CT 3 Core 2 Current
Ratio
CT 3 Core 2 Rated
Burden (VA)
CT 3 Core 2 Accuracy
Class
CT -3 Knee Point Voltage Vk
CT- 3 Exciting
Current Ie
CT -3 Secondary
Winding Resistance
Rct
CT No.4 Connectio
n Terminals
Stand by earth Fault
Vk > 25 ( Rct + 1.2 )< 30 500 /1 1 5P 20
Vk > 25 ( Rct + 1.2 )< 30 500 /1 1 5P 20
Vk > 10 ( Rct + 1.38 )< 1 1000 / 1 10 5P 10
Vk > 10 ( Rct + 1.38 )< 1 1000 / 1 10 5P 10
Vk > 10 ( Rct + 1.38 )< 1 1000 / 1 10 5P 10
250 50 6.3
250 50 6.3
175 10 12 1500/1 15 5P20 6
350 11 16 HV Phase 50 / 1 15 5P15 5 LV Neutral
≥ 360 ≤ 10.2 1500 / 1 15 5P20
30 30
30 30
2400 / 1 8 X 20 10 1500 / 1 15 5P15
100 25 2.5 300 / 1 30 5P20
100 25 2.5 300 / 1 30 5P20
≥ 240 ≤11 ≤ 3.1 30 / 1 - 1 X :2500 / 1 - 1 X ≥ 200 ≤11 ≤ 6 :2500 / 1 - 1 X ≥ 200 ≤11 ≤ 60
≥ 240 ≤11 ≤ 3.1 30 / 1 - 1 X :2500 / 1 - 1 X ≥ 200 ≤11 ≤ 6 :2500 / 1 - 1 X ≥ 200 ≤11 ≤ 60
1600 / 1 CL X ≥ 30 ( Rct + 2 )≤ 7.75 mA ≤ 10.0
1600 / 1 CL X ≥ 30 ( Rct + 2 )≤ 7.75 mA ≤ 10.0
CT4 Purpose CT5 Class Rating Rated Zo Rated Po Rated Zk Rated Pk
HV Neutral CT2 1500 / 1 10 5P20 ≤ 6
HV Neutral CT2 1500 / 1 10 5P20 ≤ 6
"4.97
5.05
25x I nominal / 3 sec
25x I nominal / 3 sec
333 200 6 1250 W 0.06 A 3.5 A 435 V 265.4 A 2.10% 727 W
1000 A RDM4800 MT4800 / 1
1200/1 X 1297 0.08
1200/1 X 1286 0.08
333 200 6 1375 0.04 1.6 505
333 200 6 1244 0.06 2.1 723
910 0.04 2.5 811
1000 ZIG ZAG / StarT93B5357E
1000 ZIG ZAG / StarT93B5357E
CT-4 Ratio (A)
CT-4 Burden
(VA)
CT -4 Class
CT -4 Knee Point Voltage Vk
CT- 4 Exciting
Current Ie
CT -4 Secondary
Winding Resistance
Rct
CT5 Ratio (A)
CT5 Burden (VA)
Impedance voltage at 75 º C @
Rated Tap
Max. neutral current
Short Circuit Current
Earth Fault Current for
10s (A/ Phase)
Earth fault current for
30S (A/ Phase)
Continuous Earth Fault
Current (A/ Phase)
Rated Io ( A)
Rated Primary Voltage
Rated Primary Current
Rated Secondary
Voltage
Rated Secondary
Current
Fault Current in HV Neutral
(A)
Line Current
Connection HV / LV
Aux
Diagram Drawing
No
Makers Serial No
33000 +/- 2 X 2.5% / 4.35 V, 50HZ
40.2 Ohm / Phase
33000 +/- 2 X 2.5 % V
3.5 A at 200 KVA base , at
normal tap
ZIG-ZAG / STAR
1500 / 1 10 5P 20
1500 / 1 10 5P 20
600 / 1 15 5P20 6
T 11 / 2 / 3064 -
T 11 / 2 / 3064
"11
"11
BIL (KV)
2.21%
440 / 1.8 A
440 / 1.8 A
25 mm of Hg
25 mm of Hg
HV / LV Impedence at 200 KVA
Base
Rated Magnetising Current
WTI CT Ratio
Vaccum with stand capacity of
tank and conservato
r
Power Frequency
Test Voltage - HV Line / Neutral
(KV)
Power Frequency
Test Voltage - LV Line
(KV)
<20mA at Vk/2
<20mA at Vk/2
70 / 40 3 170
70 / 40 3 170
Asset ID Station Area City Type Phase Freq. (Hz) No of Tap
No. Of CT CT 1 Type
CT 3 Type Purpose Duty
Asset Name
Transformer Make
Type of Cooling
Capacity (KVA)
Serial Number
Year of Manuf
Earthing TX Ref
Standard
Voltage HV (KV)
LV (V)
Current HV
(A)
LV
(A)
No Load Loss (W)
Load Loss ( W)
Impedance voltage
at 75 º C & rated Tap.
(%)
Zero Sequence Impedanc
e
Vector Group
Temp Rise in Oil (c")
Rated Voltage
(HV) @ tap position1
(V)
Rated Voltage
(HV) @ tap position 2
(V)
Rated Voltage
(HV) @ tap position
3(V)
Rated Voltage
(HV) @ tap position 4
(V)
Rated Voltage
(HV) @ tap position 5
(V)
Rated Voltage
LV
Rated Current
(HV) @ tap position 1
(A)
Rated Current
(HV) @ tap position 2
(A)
Rated Current
(HV) @ tap position 3
(A)
Rated Current
(HV) @ tap position
4(A)
Rated Current
(HV) @ tap position 5
(A)
Rated Current
LV
Rated Standard
Location of CT -1
CT 1 Makers Name
CT 1 Model No
Core 1 Connectio
n Terminals
CT-1 Ratio (A)
CT-1 Burden
(VA)
CT -1Class
CT -1 Knee Point
Voltage( Vk)
CT- 1 Exciting
Current Ie
CT -1 Secondary
Winding Resistance Rct
(Ohm)
CT 2 Core 1
Accuracy Class
CT 2 Core 1 Knee Point
Voltage (V)
CT- 2 Exciting
Current Ie (mA)
CT -2 Secondary
Winding Resistanc
e Rct (ohm)
Core 2 Duty
CT 2 Core 2
Connection
CT 2 Core 2 Current
Ratio
CT 2 Core 2 Rated
Burden (VA)
CT 2 Core 2
Accuracy Class
CT 2 Core 2 Knee Point
Voltage
CT- 2 Exciting
Current Ie
CT -2 Secondary
Winding Resistanc
e Rct (ohm)
Location of C.T. No.3
CT 3 Makers Name
CT 3 Model No
CT No.3 Connectio
n Terminals
CT-3 Ratio (A)
CT-3 Burden
(VA)
CT -3 Class
CT -3 Knee Point
Voltage Vk
CT- 3 Exciting
Current Ie
CT -3 Secondary
Winding Resistanc
e Rct
CT5 Class Rating Rated Zo Rated Po Rated Zk Rated PkCT5
Burden (VA)
Impedance voltage at 75 º C @ Rated
Tap
Max. neutral current
Short Circuit Current
Earth Fault
Current for 10s
(A/ Phase)
Earth fault current for
30S (A/ Phase)
Continuous Earth Fault
Current (A/ Phase)
Rated Io ( A)
Rated Primary Voltage
Rated Primary Current
Rated Secondary
Voltage
Rated Secondary
Current
Fault Current in HV Neutral
(A)
Line Current
Connection HV / LV
Aux
Diagram Drawing
No
Makers Serial No
HV / LV Impedence at 200
KVA Base
OTI Make Model SI No
Purpose CT 2 Type
Temp. Rise in Wind
(c")
Ambient Temp. (c")
Insulation Level HV
LV
Type of Oil
Oil Volume (Ltrs)
Oil weight (KG)
Core & Winding weight
(KG)
Transport Mass
(KG)
Untanking Mass
(KG)
Total weight
(KG)
Earth fault Current (A / Sec)
CT-1 Core 2
Ratio (A)
CT-1 Core 2 Burden
(VA)
CT-1 Core 2 Accuracy
Class
CT -1 /Core 2 Knee Point
Voltage ( V)
CT -1 /Core
2Exciting Current Ie
CT -1 /Core 2
Secondary Winding
Resistance Rct
(Ohm)
CT-1 Core
2 ALF
Location of CT No.2
CT 2 Makers Name
CT 2 Model No
CT 2 Core 1
Connection
CT 2 Core 1 Ratio
(A)
CT-2 Burden
(VA)
CT 3 Core 2 Current Ratio
CT 3 Core 2 Rated
Burden (VA)
CT 3 Core 2
Accuracy Class
CT -3 Knee Point
Voltage Vk
CT- 3 Exciting
Current Ie
CT -3 Secondary
Winding Resistanc
e Rct
CT No.4 Connectio
n Terminals
CT4 Purpose
CT-4 Ratio (A)
CT-4 Burden
(VA)
CT -4 Class
CT -4 Knee Point
Voltage Vk
CT- 4 Exciting
Current Ie
CT -4 Secondary
Winding Resistanc
e Rct
CT5 Ratio (A)
BIL (KV)Rated
Magnetising Current
WTI CT Ratio
Vaccum with stand capacity of tank
and conservat
or
Power Frequency
Test Voltage - HV Line / Neutral
(KV)
Power Frequency
Test Voltage - LV Line
(KV)
Sl.No Station Area Transformer Make Type Serial Number
1 Khaburah North Batinah CGL 315 EV9140/1 1999
2 Khaburah North Batinah CGL 315 EV9140/2 1999
3 Liwa North Batinah Voltamp 315 9915797 2008
4 Liwa North Batinah Voltamp 315 9915829 2008
5 Saham North Batinah Voltamp 315 9916685 2008
6 Saham North Batinah Voltamp 315 9916725 2008
7 Shinas North Batinah France Transfo 200 3412 - 02 1987
8 Shinas North Batinah France Transfo 200 3412 - 01 1987
9 SIA North Batinah Voltamp 750 9912764 2006
10 SIA North Batinah Voltamp 750 9912763 2006
11 SIS North Batinah ET & SL 750 11000011 01 2005
12 SIS North Batinah ET & SL 750 11000011 02 2005
13 Sohar Main North Batinah Pauwels 0SS - 28.58 / AC 70 315 9415777 1995
14 Sohar Main North Batinah Pauwels 0SS - 28.58 / AC 70 315 9415778 1995
15 Mahada Buraimi ET & SL 500 1110201 2005
16 Mahada Buraimi ET & SL 500 1110202 2005
17 Buraimi Buraimi ET & SL 315 11103 - 01 2005
18 Buraimi Buraimi ET & SL 315 11103 - 02 2005
19 Al Hail Dahirah Stomberg KTMP36NC1610 200 5172062 1986
20 Al Hail Dakhira CGL 200 2003
21 Dank Dahirah ABB TRANSMIT KTRM 36 NC 1475 200 5208064 1997
22 Dank Dahirah ABB TRANSMIT KTRM 36 NC 1475 200 5208063 1997
23 Ibri Dahirah Stomberg KTMP 36X 7101. 200 5170377 1986
24 Ibri Dahirah Stomberg KTMP36NC1610. 200 5172063 1986
25 Adam Dakhliya EMCO Limited 315 2954 2008
26 Adam Dakhliya EMCO Limited 315 2955 2008
27 Bahala Dakhliya Pauwels OSS 28.58/70 315 9417180 1995
28 Bahala Dakhliya Voltamp 750 9917778 2009
29 Iski Dakhliya Pauwels OSS 28.58/70 315 9417182 1995
30 Iski Dakhliya Pauwels OSS 28.58/70 315 9417183 1995
31 Iski Dakhliya Stomberg KTMM 39 X 5200 160 3161289 1984
32 Nizwa Dakhliya Pauwels OSS 28.58/70 315 9417184 1995
33 Nizwa Dakhliya Pauwels OSS 28.58/70 315 9417185 1995
34 Samail Dakhliya CGL 315 EV9539/1 2002
35 Samail Dakhliya CGL 315 EV9539/2 2002
36 JBB Ali Sharqiah ET & SL 315 1156502 2001
37 JBB Ali Sharqiah ET & SL 315 1156504 2001
38 Mudhaibi Sharqiah ET & SL 315 1156601 2001
39 Mudhaibi Sharqiah ET & SL 315 1156602 2001
40 Mudairib Sharqiah ET & SL 315 1156506
41 Mudairib Sharqiah ET & SL 315 1156505
42 Sur Sharqiah ET & SL 315 1156503
43 Sur Sharqiah ET & SL 315 1156501
44 Airport height Muscat ET & SL 500 19010793 / 01 2009
45 Airport height Muscat ET & SL 500 19010793 / 02 2009
46 Al Falaj Muscat Voltamp 315 9918649 2010
47 Al Falaj Muscat Fuji Electric 250 AC95384T701 1980
48 Azaiba Coast Muscat ET & SL 500 19010792 / 01 2009
49 Azaiba Coast Muscat ET & SL 500 19010792 / 02 2009
50 Azaiba Coast Muscat ET & SL 500 19010792 / 03 2009
51 Boushar Muscat CGL 315 EV 9540 / 1 2002
52 Boushar Muscat CGL 315 EV 9540 / 2 2002
53 Boushar Muscat Voltamp 315 9919890 2011
54 Ghubrah PS Muscat Voltamp Earthing Transformer 315 9918623 2010
55 Jahloot Muscat CGL 315 EV 9208 / 1 1999
56 Jahloot Muscat CGL 315 EV 9208 / 2 1999
57 MSQ Muscat N.I 200 212871360 1988
58 MSQ Muscat N.I 200 212871361 1988
59 MSQ Muscat Voltamp 315 9919280 2010
60 Mawaleh Muscat CGL 315 EV 9224 / 1 1999
61 Mawaleh Muscat CGL 315 EV 9224 / 2 1999
62 Mawaleh Muscat Voltamp 315 9919366 2010
63 Rusail PS Muscat BONAR LONG Ltd 07 / 82 / 1912 1983
64 Rusail PS Muscat BONAR LONG Ltd 07 / 82 / 1913 1983
65 Rusail PS Muscat STEM 6590/1 1987
66 Rusail PS Muscat STEM 6590/2 1987
67 Seeb Main Muscat Stromeberg KTMM 36 X 5200 160 5161290 1984
68 Wadi Adai Muscat Fuji Electric 315 AJ69080 T3-1 1984
69 Wadi Adai Muscat Fuji Electric 315 AJ69080 T3-2 1984
70 Wadi Kabir Muscat Brown Boveri GBAS1-2000 200 WBB42473 1987
71 Wadi Kabir Muscat Brown Boveri GBAS1-2000 200 WBB42474 1987
72 Wadi Kabir Muscat Voltamp 315 9919363 2010
73 Barka Main South Batinah Stromberg KTCM 36X 7100 200 5168079 1986
74 Barka Main South Batinah Stromberg KTCM 36X 7100 200 5168077 1986
75 Filayj South Batinah ET & SL 750 1164101 2002
76 Filayj South Batinah ET & SL 750 1164102 2002
77 MIS South Batinah ET & SL 750 1100001103 2005
78 MIS South Batinah ET & SL 750 1100001104 2005
79 Mulladah South Batinah N.I. 200 202903023 1991
80 Mulladah South Batinah N.I. 200 202903024 1991
81 Rustaq South Batinah CGL 315 MT5470 / 2 2005
Capacity (KVA)
Year of Manuf
82 Rustaq South Batinah CGL MT5470 / 1 2005
83
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