OIP Transformer Bushing

Rated Voltage 25 ~ 765 kV (IEEE) 24 ~ 1,100 kV (IEC)
Rated Current 400 ~ 5,000 A (IEEE) 630 ~ 5,000 A (IEC)
Standard IEEE C57.19.01 / IEC-60137
Insulation Oil-impregnated paper
Application Power Transformer
Types Oil-Air
Housing Porcelain / Silicone
Conductor Draw lead / Draw rod / Bottom connected
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OIP Bushings

OIP Transformer Bushing

ZDVolt’s OIP Oil-Air transformer bushings represent the industry’s most proven and widely deployed bushing technology. Engineered for power transformers operating at the standard rated levels, these bushings provide exceptional dielectric performance and long-term reliability in the most demanding environments. 

Our finely graded, computer-aided condenser core design ensures optimum electric field distribution, while the use of high-quality oil-impregnated paper insulation delivers consistently low dissipation factor and partial discharge-free operation throughout the product’s service life.

By end of 2025, ZDVolt’OIP bushings has 100,000+ pieces installed worldwide.

Key Specifications

  • Voltage range: 24 kV to 1,100 kV (IEEE/IEC)
  • Current ratings: 400 A to 5,000 A (IEEE/IEC)
  • Insulator options: High-strength glazed porcelain or silicone rubber
  • Conductor types: Draw lead, draw rod, or bottom connected configurations

Catalog

OIP range from 25 to 69 kV: Ratings & Dimensions

OIP range from 25 to 69 kV: Ratings & Dimensions
Style No. Catalog No. Nominal voltage BIL Rated current Creepage distance Min. Arcing distance Min. (L3) Max. altitude Overall length (L) Length above flange (L2) Length below flange (L1) Min. oil level and CT length (W) Oil end diameter Max. (D1) Type of lead Inner tube diameter （d1） Draw lead length (air side) Bottom terminal Top terminal Head metal part diameter (D2) Flange gasket space Flange
Fig. N R A ​ Inside diameter Max. Outside diameter Min. Holes No. Hole size B.C.
kV kV A mm in mm in m ft mm in mm in mm in mm in mm in ​ mm in mm in ​ mm in ​ mm in mm in mm in mm in No. mm in mm in
ZDTOIP 150-25-400 OA0250400 25 150 400 780 30.71 300 11.81 2700 8856 1454 57.24 705 27.76 749 29.49 533.4 21.00 79 3.11 DL 22 0.88 475 18.70 - - - 1.5-12 54.102 2.13 140 5.51 152.4 6.00 209.55 8.25 4 22.352 0.88 184 7.25
ZDTOIP 150-25-1200 OA0251200 25 150 1200 780 30.71 300 11.81 2700 8856 1454 57.24 705 19.74 749 37.50 533.4 21.00 79 3.11 BC - - - - 1.1 - - 1.5-12 54.102 2.13 140 5.51 152.4 6.00 209.55 8.25 4 22.352 0.88 184 7.25
ZDTOIP 150-25-2000 OA0252000 25 150 2000 780 30.71 300 11.81 2700 8856 1495 58.86 695 19.36 800 39.50 533.4 21.00 92 3.62 BC - - - - 1.2 - - 1.5-12 63.5 2.50 140 5.51 152.4 6.00 209.55 8.25 4 22.352 0.88 184 7.25
ZDTOIP 150-25-3000 OA0253000 25 150 3000 780 30.71 300 11.81 2700 8856 1605 63.19 805 23.69 800 39.50 533.4 21.00 115 4.53 BC - - - - 1.3 - - 2.0-12 76.2 3.00 180 7.09 177.8 7.00 234.95 9.25 4 22.352 0.88 210 8.25
ZDTOIP 150-25-5000 OA0255000 25 150 5000 780 30.71 300 11.81 2700 8856 1753 69.02 915 29.52 838 39.50 533.4 21.00 160 6.30 BC - - - - 1.4 - - 4.0-12 101.6 4.00 250 9.84 254 10.00 323.85 12.75 6 22.352 0.88 260 10.25
ZDTOIP 200-34.5-400 OA0340400 34.5 200 400 1076 42.36 400 15.75 2700 8856 1655 65.16 855 33.66 800 31.50 533.4 21.00 89 3.50 DL 22 0.88 625 24.61 - - - 1.5-12 54.102 2.13 140 5.51 152.4 6.00 209.55 8.25 4 22.352 0.88 184 7.25
ZDTOIP 200-34.5-1200 OA0341200 34.5 200 1200 1076 42.36 400 15.75 2700 8856 1655 65.16 855 27.66 800 37.50 533.4 21.00 89 3.50 BC - - - - 1.1 - - 1.5-12 54.102 2.13 140 5.51 152.4 6.00 209.55 8.25 4 22.352 0.88 184 7.25
ZDTOIP 200-34.5-2000 OA0342000 34.5 200 2000 1076 42.36 400 15.75 2700 8856 1691 66.57 840 27.07 851 39.50 533.4 21.00 102 4.02 BC - - - - 1.2 - - 1.5-12 63.5 2.50 140 5.51 152.4 6.00 209.55 8.25 4 22.352 0.88 184 7.25
ZDTOIP 200-34.5-3000 OA0343000 34.5 200 3000 1076 42.36 400 15.75 2700 8856 1751 68.94 900 29.44 851 39.50 533.4 21.00 115 4.53 BC - - - - 1.3 - - 2.0-12 76.2 3.00 180 7.09 177.8 7.00 234.95 9.25 6 22.352 0.88 235 9.25
ZDTOIP 200-34.5-5000 OA0345000 34.5 200 5000 1076 42.36 400 15.75 2700 8856 1866 73.46 1015 33.96 851 39.50 533.4 21.00 160 6.30 BC - - - - 1.4 - - 4.0-12 101.6 4.00 250 9.84 254 10.00 323.85 12.75 6 22.352 0.88 260 10.25
ZDTOIP 250-46-400 OA0460400 46 250 400 1435 56.50 485 19.09 2700 8856 1791 70.51 839 33.03 952 37.48 533.4 21.00 100 3.94 DL 22 0.88 710 27.95 - - - 1.5-12 54.102 2.13 140 5.51 152.4 6.00 209.55 8.25 4 22.352 0.88 210 8.25
ZDTOIP 250-46-1200 OA0461200 46 250 1200 1435 56.50 485 19.09 2700 8856 1791 70.51 839 33.01 952 37.50 533.4 21.00 100 3.94 BC - - - - 1.1 - - 1.5-12 54.102 2.13 140 5.51 152.4 6.00 209.55 8.25 4 22.352 0.88 210 8.25
ZDTOIP 250-46-2000 OA0462000 46 250 2000 1435 56.50 485 19.09 2700 8856 1827 71.93 824 32.43 1003 39.50 533.4 21.00 115 4.53 BC - - - - 1.2 - - 1.5-12 63.5 2.50 140 5.51 152.4 6.00 209.55 8.25 4 22.352 0.88 210 8.25
ZDTOIP 250-46-3000 OA0463000 46 250 3000 1435 56.50 485 19.09 2700 8856 1887 74.29 884 34.79 1003 39.50 533.4 21.00 130 5.12 BC - - - - 1.3 - - 2.0-12 76.2 3.00 180 7.09 177.8 7.00 234.95 9.25 6 22.352 0.88 235 9.25
ZDTOIP 250-46-5000 OA0465000 46 250 5000 1435 56.50 485 19.09 2700 8856 2040 80.31 1037 40.81 1003 39.50 533.4 21.00 160 6.30 BC - - - - 1.4 - - 4.0-12 101.6 4.00 250 9.84 254 10.00 323.85 12.75 6 31.75 1.25 286 11.25
ZDTOIP 350-69-400 OA0690400 69 350 400 2155 84.84 700 27.56 2700 8856 2152 84.72 1200 47.24 952 37.48 533.4 21.00 115 4.53 DL 27.94 1.10 960 37.80 - - - 1.5-12 54.102 2.13 180 7.09 152.4 6.00 209.55 8.25 6 22.352 0.88 234.95 9.25
ZDTOIP 350-69-1200 OA0691200 69 350 1200 2155 84.84 700 27.56 2700 8856 2152 84.72 1200 47.22 952 37.50 533.4 21.00 115 4.53 BC - - - - 1.1 - - 1.5-12 54.102 2.13 180 7.09 152.4 6.00 209.55 8.25 6 22.352 0.88 234.95 9.25
ZDTOIP 350-69-2000 OA0692000 69 350 2000 2155 84.84 700 27.56 2700 8856 2193 86.34 1190 46.84 1003 39.50 533.4 21.00 138 5.43 BC - - - - 1.2 - - 1.5-12 63.5 2.50 180 7.09 152.4 6.00 209.55 8.25 6 22.352 0.88 234.95 9.25
ZDTOIP 350-69-3000 OA0693000 69 350 3000 2155 84.84 700 27.56 2700 8856 2233 87.91 1230 48.41 1003 39.50 533.4 21.00 160 6.30 BC - - - - 1.3 - - 2.0-12 76.2 3.00 200 7.87 177.8 7.00 234.95 9.25 6 22.352 0.88 260.35 10.25
ZDTOIP 350-69-5000 OA0695000 69 350 5000 2155 84.84 700 27.56 2700 8856 2353 92.64 1350 53.14 1003 39.50 533.4 21.00 180 7.09 BC - - - - 1.4 - - 4.0-12 101.6 4.00 250 9.84 254 10.00 323.85 12.75 6 31.75 1.25 361.95 14.25

OIP range from 115 to 765 kV: Ratings & Dimensions

OIP range from 115 to 765 kV: Ratings & Dimensions
Style No. Catalog No. Figure Nominal voltage BIL Rated current Creepage distance Min. Arcing distance Min. (L3) Max. altitude Approx. weight Overall length (L) Length above flange (L2) Length below flange (L1) Min. oil level and CT length (W) Oil end diameter Max. (D1) Type of lead Inner tube diameter Min.（d1） Draw lead length (air side) Bottom terminal Top terminal Head metal part diameter (D2) Flange gasket space Flange ​ ​ ​ ​
Fig. N R A Inside diameter Max. Outside diameter Min. Holes No. Hole size B.C. Outer diameter Thickness (t)
kV kV A mm in mm in m ft kg lbs mm in mm in mm in mm in mm in ​ mm in mm in ​ mm in ​ mm in mm in mm in mm in No. mm in mm in mm inches mm inches
ZDTOIP 550-115-800 OA1150800 2 115 550 800 3585 141.14 1100 43.31 2400 7874 ​ ​ 2797 110.12 1704.8 67.12 1092.2 43.00 584.2 23.00 180 7.09 DL 43.942 1.73 1455 57.28 - - - 1.5-12 50.8 2.00 250 9.84 250.952 9.88 301.752 11.88 6 31.75 1.25 336.55 13.25 400 15.75 24.892 0.98
ZDTOIP 550-115-1200 OA1151200 2 115 550 1200 3585 141.14 1100 43.31 2400 7874 ​ ​ 2797 110.12 1704.8 67.12 1092.2 43.00 584.2 23.00 180 7.09 BC - - - - 2.1 - - 1.5-12 50.8 2.00 250 9.84 250.952 9.88 301.752 11.88 6 31.75 1.25 336.55 13.25 400 15.75 24.892 0.98
ZDTOIP 550-115-2000 OA1152000 2 115 550 2000 3585 141.14 1100 43.31 2400 7874 ​ ​ 2782 109.53 1689.8 66.53 1092.2 43.00 584.2 23.00 180 7.09 BC - - - - 2.2 - - 1.5-12 63.5 2.50 250 9.84 250.952 9.88 301.752 11.88 6 31.75 1.25 336.55 13.25 400 15.75 24.892 0.98
ZDTOIP 550-115-3000 OA1153000 2 115 550 3000 3585 141.14 1100 43.31 2400 7874 ​ ​ 2812 110.71 1719.8 67.71 1092.2 43.00 584.2 23.00 180 7.09 BC - - - - 2.2 - - 2.0-12 76.2 3.00 250 9.84 250.952 9.88 301.752 11.88 6 31.75 1.25 336.55 13.25 400 15.75 24.892 0.98
ZDTOIP 550-115-5000 OA1155000 2 115 550 5000 3585 141.14 1100 43.31 2400 7874 ​ ​ 2847 112.09 1754.8 69.09 1092.2 43.00 584.2 23.00 205 8.07 BC - - - - 2.2 - - 4.0-12 101.6 4.00 250 9.84 250.952 9.88 301.752 11.88 6 31.75 1.25 336.55 13.25 400 15.75 24.892 0.98
ZDTOIP 650-138-800 OA1380800 2 138 650 800 4310 169.69 1250 49.21 2100 6888 ​ ​ 3043 119.80 1855 73.05 1188 46.75 584.2 23.00 180 7.09 DL 43.942 1.73 1605 63.19 ​ - - 1.5-12 50.8 2.00 250 9.84 276.352 10.88 327.152 12.88 6 31.75 1.25 361.95 14.25 420 16.54 24.892 0.98
ZDTOIP 650-138-1200 OA1381200 2 138 650 1200 4310 169.69 1250 49.21 2100 6888 ​ ​ 3043 119.80 1855 73.05 1188 46.75 584.2 23.00 180 7.09 BC - - - - 2.1 - - 1.5-12 50.8 2.00 250 9.84 276.352 10.88 327.152 12.88 6 31.75 1.25 361.95 14.25 420 16.54 24.892 0.98
ZDTOIP 650-138-2000 OA1382000 2 138 650 2000 4310 169.69 1250 49.21 2100 6888 ​ ​ 3028 119.21 1840 72.46 1188 46.75 584.2 23.00 180 7.09 BC - - - - 2.2 - - 1.5-12 63.5 2.50 250 9.84 276.352 10.88 327.152 12.88 6 31.75 1.25 361.95 14.25 420 16.54 24.892 0.98
ZDTOIP 650-138-3000 OA1383000 2 138 650 3000 4310 169.69 1250 49.21 2100 6888 ​ ​ 3058 120.39 1870 73.64 1188 46.75 584.2 23.00 180 7.09 BC - - - - 2.2 - - 2.0-12 76.2 3.00 250 9.84 276.352 10.88 327.152 12.88 6 31.75 1.25 361.95 14.25 420 16.54 24.892 0.98
ZDTOIP 650-138-5000 OA1385000 2 138 650 5000 4310 169.69 1250 49.21 2100 6888 ​ ​ 3093 121.77 1905 75.02 1188 46.75 584.2 23.00 204.978 8.07 BC - - - - 2.2 - - 4.0-12 101.6 4.00 250 9.84 276.352 10.88 327.152 12.88 6 31.75 1.25 361.95 14.25 420 16.54 24.892 0.98
ZDTOIP 750-161-800 OA1610800 2 161 750 800 5020 197.64 1475 58.07 2100 6888 ​ ​ 3356 132.13 2080 81.88 1276 50.25 584.2 23.00 190 7.48 DL 43.942 1.73 1830 72.05 ​ - - 1.5-12 50.8 2.00 250 9.84 314.452 12.38 365.252 14.38 8 31.75 1.25 400.05 15.75 450 17.72 24.892 0.98
ZDTOIP 750-161-1200 OA1611200 2 161 750 1200 5020 197.64 1475 58.07 2100 6888 ​ ​ 3356 132.13 2080 81.88 1276 50.25 584.2 23.00 190 7.48 BC - - - - 2.1 - - 1.5-12 50.8 2.00 250 9.84 314.452 12.38 365.252 14.38 8 31.75 1.25 400.05 15.75 450 17.72 24.892 0.98
ZDTOIP 750-161-2000 OA1612000 2 161 750 2000 5020 197.64 1475 58.07 2100 6888 ​ ​ 3341 131.54 2065 81.29 1276 50.25 584.2 23.00 190 7.48 BC - - - - 2.2 - - 1.5-12 63.5 2.50 250 9.84 314.452 12.38 365.252 14.38 8 31.75 1.25 400.05 15.75 450 17.72 24.892 0.98
ZDTOIP 750-161-3000 OA1613000 2 161 750 3000 5020 197.64 1475 58.07 2100 6888 ​ ​ 3371 132.72 2095 82.47 1276 50.25 584.2 23.00 190 7.48 BC - - - - 2.2 - - 2.0-12 76.2 3.00 250 9.84 314.452 12.38 365.252 14.38 8 31.75 1.25 400.05 15.75 450 17.72 24.892 0.98
ZDTOIP 750-161-5000 OA1615000 2 161 750 5000 5020 197.64 1475 58.07 2100 6888 ​ ​ 3471 136.65 2195 86.40 1276 50.25 584.2 23.00 265 10.43 BC - - - - 2.2 - - 4.0-12 101.6 4.00 350 13.78 314.452 12.38 365.252 14.38 8 31.75 1.25 400.05 15.75 450 17.72 24.892 0.98
ZDTOIP 900-230-800 OA2300800 2 230 900 800 7170 271.65 2050 80.71 3000 9840 ​ ​ 4066 160.08 2790 109.83 1276 50.25 584.2 23.00 264.922 10.43 DL 43.942 1.73 2515 99.02 ​ - - 1.5-12 50.8 2.00 350 13.78 435.102 17.13 495.3 19.50 12 31.75 1.25 533.4 21.00 590 23.23 24.892 0.98
ZDTOIP 900-230-1200 OA2301200 2 230 900 1200 7170 271.65 2050 80.71 3000 9840 ​ ​ 4066 160.08 2790 109.83 1276 50.25 584.2 23.00 264.922 10.43 BC - - - - 2.2 - - 1.5-12 50.8 2.00 350 13.78 435.102 17.13 495.3 19.50 12 31.75 1.25 533.4 21.00 590 23.23 24.892 0.98
ZDTOIP 900-230-2000 OA2302000 2 230 900 2000 7170 271.65 2050 80.71 3000 9840 ​ ​ 4026 158.50 2750 108.25 1276 50.25 584.2 23.00 264.922 10.43 BC - - - - 2.2 - - 1.5-12 63.5 2.50 350 13.78 435.102 17.13 495.3 19.50 12 31.75 1.25 533.4 21.00 590 23.23 24.892 0.98
ZDTOIP 900-230-3000 OA2303000 2 230 900 3000 7170 271.65 2050 80.71 3000 9840 ​ ​ 4056 159.69 2780 109.44 1276 50.25 584.2 23.00 264.922 10.43 BC - - - - 2.2 - - 2.0-12 76.2 3.00 350 13.78 435.102 17.13 495.3 19.50 12 31.75 1.25 533.4 21.00 590 23.23 24.892 0.98
ZDTOIP 900-230-5000 OA2305000 2 230 900 5000 7170 271.65 2050 80.71 3000 9840 ​ ​ 4086 160.87 2810 110.62 1276 50.25 584.2 23.00 264.922 10.43 BC - - - - 2.2 - - 4.0-12 101.6 4.00 350 13.78 435.102 17.13 495.3 19.50 12 31.75 1.25 533.4 21.00 590 23.23 24.892 0.98
ZDTOIP 1175-345-800 OA3450800 3 345 1175 800 10760 423.62 2900 114.17 2100 6888 ​ ​ 5105 200.98 3810 149.98 1295 51.00 584.2 23.00 300 11.81 DL 55 2.17 3555 139.96 ​ - - 1.5-12 50.8 2.00 450 17.72 435.102 17.13 495.3 19.50 12 31.75 1.25 533.4 21.00 590.042 23.23 30 1.18
ZDTOIP 1175-345-1200 OA3451200 3 345 1175 1200 10760 423.62 2900 114.17 2100 6888 ​ ​ 5105 200.98 3810 149.98 1295 51.00 584.2 23.00 300 11.81 BC - - - - 2.3 209.55 8.25 1.5-12 50.8 2.00 450 17.72 435.102 17.13 495.3 19.50 12 31.75 1.25 533.4 21.00 590.042 23.23 30 1.18
ZDTOIP 1175-345-2000 OA3452000 3 345 1175 2000 10760 423.62 2900 114.17 2100 6888 ​ ​ 5085 200.20 3790 149.20 1295 51.00 584.2 23.00 300 11.81 BC - - - - 2.3 209.55 8.25 1.5-12 63.5 2.50 450 17.72 435.102 17.13 495.3 19.50 12 31.75 1.25 533.4 21.00 590.042 23.23 30 1.18
ZDTOIP 1175-345-3000 OA3453000 3 345 1175 3000 10760 423.62 2900 114.17 2100 6888 ​ ​ 5095 200.59 3800 149.59 1295 51.00 584.2 23.00 300 11.81 BC - - - - 2.3 209.55 8.25 2.0-12 76.2 3.00 450 17.72 435.102 17.13 495.3 19.50 12 31.75 1.25 533.4 21.00 590.042 23.23 30 1.18
ZDTOIP 1675-500-800 OA5000800 3 500 1675 800 15600 614.17 4270 168.11 1000 3280 ​ ​ 6895 271.46 5244 206.46 1651 65.00 584.2 23.00 435 17.13 DL 60 2.36 4969 195.63 ​ - - 1.5-12 50.8 2.00 520 20.47 533.4 21.00 584.2 23.00 12 31.75 1.25 635 25.00 710 27.95 33 1.30
ZDTOIP 1675-500-1200 OA5001200 3 500 1675 1200 15600 614.17 4270 168.11 1000 3280 ​ ​ 6895 271.46 5244 206.46 1651 65.00 584.2 23.00 435 17.13 BC - - - ​ 2.3 209.55 8.25 1.5-12 50.8 2.00 520 20.47 533.4 21.00 584.2 23.00 12 31.75 1.25 635 25.00 710 27.95 33 1.30
ZDTOIP 1675-500-2000 OA5002000 3 500 1675 2000 15600 614.17 4270 168.11 1000 3280 ​ ​ 6875 270.67 5224 205.67 1651 65.00 584.2 23.00 435 17.13 BC - - - ​ 2.3 209.55 8.25 1.5-12 63.5 2.50 520 20.47 533.4 21.00 584.2 23.00 12 31.75 1.25 635 25.00 710 27.95 33 1.30
ZDTOIP 1675-500-3000 OA5003000 3 500 1675 3000 15600 614.17 4270 168.11 1000 3280 ​ ​ 6885 271.06 5234 206.06 1651 65.00 584.2 23.00 435 17.13 BC - - - ​ 2.3 209.55 8.25 2.0-12 76.2 3.00 520 20.47 533.4 21.00 584.2 23.00 12 31.75 1.25 635 25.00 710 27.95 33 1.30
ZDTOIP 2050-765-800 OA7650800 3 765 2050 800 23850 938.98 6600 168.11 2100 6888 ​ ​ 10163 400.12 8004 315.12 2159 85.00 584 23.00 435 17.13 DL 60 2.36 7749 305.08 ​ ​ ​ 1.5-12 50.8 2.00 650 25.59 749 29.50 854 33.63 16 32 1.25 889 35.00 ​ ​ ​ ​
ZDTOIP 2050-765-1200 OA7651200 3 765 2050 1200 23850 938.98 6600 168.11 2100 6888 ​ ​ 10163 400.12 8004 315.12 2159 85.00 584 23.00 435 17.13 BC ​ - ​ ​ 2.3 210 8.25 1.5-12 50.8 2.00 650 25.59 749 29.50 854 33.63 16 32 1.25 889 35.00 ​ ​ ​ ​
ZDTOIP 2050-765-2000 OA7652000 3 765 2050 2000 23850 938.98 6600 168.11 2100 6888 ​ ​ 10143 399.33 7984 314.33 2159 85.00 584 23.00 435 17.13 BC ​ - ​ ​ 2.3 210 8.25 1.5-12 63.5 2.50 650 25.59 749 29.50 854 33.63 16 32 1.25 889 35.00 ​ ​ ​ ​

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