ZDVolt’s P&OTM Type II High Current bushings are engineered for applications requiring exceptionally high current ratings. Designed for generator step-up transformers, furnace transformers, and other high-current installations, these bushings feature oversized conductor systems and enhanced thermal management.
By end of 2025, ZDVolt’s P&OTM Type II bushings has 3,000 pieces installed worldwide
Key Specifications
- Voltage range: 1 kV to 52 kV (IEEE/IEC)
- Current ratings: 6,000 A to 45,000 A (IEEE/IEC)
- Enhanced thermal design for continuous high-current operation
- Large-diameter conductor system
Catalog
ZDTHPO 15 kV range: Ratings & Dimensions
| Style No. | Catalog No. | Rating | Bottom End | Terminal details | Flange gasket space | Flange(Figure 1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Um (kV) | BIL (kV) | Ir (A) | Length below flange(L) | CT length(W) | Oil end diameter Max(D) | Length above flange Maximum | Top | Bottom | Inside diameter Maximum(P) | Outside diameter Maximum(Q) | Holes | Hole size | B.C. | ||
| terminal (Figure2) | terminal (Figure 3) | N0. | |||||||||||||
| ZDTHPO 110-15-6000 | HPO015060 | 15 | 110 | 6000 | 800 (31.50) | 533 (21.00) | 248 (9.75) | 660 (26.00) | 4/6 | 1/4 | 251 (9.88) | 302 (11.88) | 6 | 22 (0.88) | 337 (13.25) |
| ZDTHPO 110-15-7500 | HPO015075 | 15 | 110 | 7500 | 800 (31.50) | 533 (21.00) | 248 (9.75) | 660 (26.00) | 4/6 | 1/6 | 251 (9.88) | 302 (11.88) | 6 | 22 (0.88) | 337 (13.25) |
| ZDTHPO 110-15-10000 | HPO015100 | 15 | 110 | 10000 | 800 (31.50) | 533 (21.00) | 300 (11.81) | 660 (26.00) | 4/8 | 2/6 | 315 (12.38) | 372 (14.63) | 8 | 22 (0.88) | 400 (15.75) |
| ZDTHPO 110-15-12000 | HPO015120 | 15 | 110 | 12000 | 800 (31.50) | 533 (21.00) | 360 (14.17) | 660 (26.00) | 4/10 | 2/6 | 372 (14.63) | 438 (17.25) | 12 | 22 (0.88) | 470 (18.50) |
| ZDTHPO 110-15-14000 | HPO015140 | 15 | 110 | 14000 | 800 (31.50) | 533 (21.00) | 360 (14.17) | 660 (26.00) | 4/10 | 2/6 | 372 (14.63) | 438 (17.25) | 12 | 22 (0.88) | 470 (18.50) |
| ZDTHPO 110-15-16000 | HPO015160 | 15 | 110 | 16000 | 800 (31.50) | 533 (21.00) | 400 (15.75) | 660 (26.00) | 4/12 | 2/8 | 406 (16.00) | 495 (19.50) | 12 | 22 (0.88) | 533 (21.00) |
| ZDTHPO 110-15-18000 | HPO015180 | 15 | 110 | 18000 | 800 (31.50) | 533 (21.00) | 400 (15.75) | 660 (26.00) | 4/12 | 2/8 | 406 (16.00) | 495 (19.50) | 12 | 22 (0.88) | 533 (21.00) |
| ZDTHPO 110-15-20000 | HPO015200 | 15 | 110 | 20000 | 800 (31.50) | 533 (21.00) | 400 (15.75) | 660 (26.00) | 4/14 | 2/10 | 406 (16.00) | 495 (19.50) | 12 | 22 (0.88) | 533 (21.00) |
ZDHPO 25 kV range: Ratings & Dimensions
| Style No. | Catalog No. | Rating | Bottom End | Terminal details | Flange gasket space | Flange(Figure 1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Um (kV) | BIL (kV) | Ir (A) | Length below flange(L) | CT length(W) | Oil end diameter Max(D) | Length above flange Maximum | Top | Bottom | Inside diameter Maximum(P) | Outside diameter Maximum(Q) | Holes | Hole size | B.C. | ||
| terminal (Figure2) | terminal (Figure 3) | N0. | |||||||||||||
| ZDHPO 150-25-6000 | HPO025060 | 25 | 150 | 6000 | 826 (32.50) | 533 (21.00) | 248 (9.75) | 711 (28.00) | 4/6 | 1/4 | 251 (9.88) | 302 (11.88) | 6 | 22 (0.88) | 337 (13.25) |
| ZDHPO 150-25-7500 | HPO025075 | 25 | 150 | 7500 | 826 (32.50) | 533 (21.00) | 248 (9.75) | 711 (28.00) | 4/6 | 1/6 | 251 (9.88) | 302 (11.88) | 6 | 22 (0.88) | 337 (13.25) |
| ZDHPO 150-25-10000 | HPO025100 | 25 | 150 | 10000 | 826 (32.50) | 533 (21.00) | 300 (11.81) | 711 (28.00) | 4/8 | 2/6 | 315 (12.38) | 372 (14.63) | 8 | 22 (0.88) | 400 (15.75) |
| ZDHPO 150-25-12000 | HPO025120 | 25 | 150 | 12000 | 826 (32.50) | 533 (21.00) | 360 (14.17) | 711 (28.00) | 4/10 | 2/6 | 372 (14.63) | 438 (17.25) | 12 | 22 (0.88) | 470 (18.50) |
| ZDHPO 150-25-14000 | HPO025140 | 25 | 150 | 14000 | 826 (32.50) | 533 (21.00) | 360 (14.17) | 711 (28.00) | 4/10 | 2/6 | 372 (14.63) | 438 (17.25) | 12 | 22 (0.88) | 470 (18.50) |
| ZDHPO 150-25-16000 | HPO025160 | 25 | 150 | 16000 | 826 (32.50) | 533 (21.00) | 400 (15.75) | 864 (34.00) | 4/12 | 2/8 | 406 (16.00) | 495 (19.50) | 12 | 22 (0.88) | 533 (21.00) |
| ZDHPO 150-25-18000 | HPO025180 | 25 | 150 | 18000 | 826 (32.50) | 533 (21.00) | 400 (15.75) | 864 (34.00) | 4/12 | 2/8 | 406 (16.00) | 495 (19.50) | 12 | 22 (0.88) | 533 (21.00) |
| ZDHPO 150-25-20000 | HPO025200 | 25 | 150 | 20000 | 826 (32.50) | 533 (21.00) | 400 (15.75) | 864 (34.00) | 4/14 | 2/10 | 406 (16.00) | 495 (19.50) | 12 | 22 (0.88) | 533 (21.00) |
ZDTHPO 34.5 kV range: Ratings & Dimensions
| Style No. | Catalog No. | Rating | Bottom End | Terminal details | Flange gasket space | Flange(Figure 1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Um (kV) | BIL (kV) | Ir (A) | Length below flange(L) | CT length(W) | Oil end diameter Max(D) | Length above flange Maximum | Top | Bottom | Inside diameter Maximum(P) | Outside diameter Maximum(Q) | Holes | Hole size | B.C. | ||
| terminal (Figure2) | terminal (Figure 3) | N0. | |||||||||||||
| ZDTHPO 200-34.5-6000 | HPO034060 | 34.5 | 200 | 6000 | 851 (33.50) | 533 (21.00) | 248 (9.75) | 864 (34.00) | 4/6 | 1/4 | 251 (9.88) | 302 (11.88) | 6 | 22 (0.88) | 337 (13.25) |
| ZDTHPO 200-34.5-7500 | HPO034075 | 34.5 | 200 | 7500 | 851 (33.50) | 533 (21.00) | 300 (11.81) | 864 (34.00) | 4/8 | 2/6 | 315 (12.38) | 372 (14.63) | 8 | 22 (0.88) | 400 (15.75) |
| ZDTHPO 200-34.5-10000 | HPO034100 | 34.5 | 200 | 10000 | 851 (33.50) | 533 (21.00) | 300 (11.81) | 864 (34.00) | 4/8 | 2/6 | 315 (12.38) | 372 (14.63) | 8 | 22 (0.88) | 400 (15.75) |
| ZDTHPO 200-34.5-12000 | HPO034120 | 34.5 | 200 | 12000 | 851 (33.50) | 533 (21.00) | 360 (14.17) | 864 (34.00) | 4/10 | 2/6 | 372 (14.63) | 439 (17.25) | 12 | 22 (0.88) | 470 (18.5) |
| ZDTHPO 200-34.5-14000 | HPO034140 | 34.5 | 200 | 14000 | 851 (33.50) | 533 (21.00) | 360 (14.17) | 864 (34.00) | 4/10 | 2/6 | 372 (14.63) | 439 (17.25) | 12 | 22 (0.88) | 470 (18.5) |
| ZDTHPO 200-34.5-16000 | HPO034160 | 34.5 | 200 | 16000 | 851 (33.50) | 533 (21.00) | 400 (15.75) | 864 (34.00) | 4/12 | 2/8 | 406 (16.00) | 495 (19.50) | 12 | 22 (0.88) | 533 (21.00) |
| ZDTHPO 200-34.5-18000 | HPO034180 | 34.5 | 200 | 18000 | 851 (33.50) | 533 (21.00) | 400 (15.75) | 864 (34.00) | 4/12 | 2/8 | 406 (16.00) | 495 (19.50) | 12 | 22 (0.88) | 533 (21.00) |
| ZDTHPO 200-34.5-20000 | HPO034200 | 34.5 | 200 | 20000 | 851 (33.50) | 533 (21.00) | 400 (15.75) | 864 (34.00) | 4/14 | 2/10 | 406 (16.00) | 495 (19.50) | 12 | 22 (0.88) | 533 (21.00) |
Dimension Drawings
