EN 50186 12-36KV Standard Porcelain Bushings(250-3150A)
This series of products is a medium-voltage oil-filled porcelain bushing designed according to EN 50180 and EN 50243 standards. It is mainly used as the low-voltage side lead bushing for oil-immersed power transformers, enabling a safe connection between the internal windings of the transformer and the external power grid...
Product Profile
Product Overview
This series of products is a medium-voltage oil-filled porcelain bushing designed according to EN 50180 and EN 50243 standards. It is mainly used as the low-voltage side lead bushing for oil-immersed power transformers, enabling a safe connection between the internal windings of the transformer and the external power grid.
The products cover voltage levels from 12kV to 36kV, with rated currents ranging from 250A to 3150A, making them adaptable to transformers of different capacities.
Product Materials
Insulator Design: Solid rod / Split type / Cable-through type
Rod Material: Brass or Copper
Insulator Material: Ceramic
Surface Treatment: Customizable tin or silver plating
Standard Reference: EN 50180, EN 50243
Product Features
Compliance with EN Standards: Meets EN 50180 and EN 50243 standards, ensuring reliable quality, dimensions, and performance in line with international norms.
Oil-impregnated Composite Insulation: The insulator combines solid ceramic with liquid (transformer oil) in a composite structure. This design significantly enhances electrical insulation strength and effectively dissipates heat generated by high currents.
High Quality Materials
Insulator Body: Made of high-quality ceramic with excellent electrical insulation, high-temperature resistance, and weather durability.
Conductive Rod: Usually brass or copper, ensuring good conductivity.
High Customizability: Manufacturers typically offer extensive customization options, such as extended conductive rods, special connectors, and special surface treatments (tin/silver plating) to meet specific customer needs.
Strong Adaptability: Designed for both indoor and outdoor installation, and reliable even in extreme conditions like high pollution, extreme cold/heat, or strong corrosion.
Main Applications
Core Application: Oil-immersed power transformers, installed on the low-voltage side.
Other Applications: Suitable for other power equipment requiring medium-voltage cables to pass through oil tanks or enclosures.
Technical Parameters
No. | Type | Factory Code | Color | Rated Voltage (kV) | Rated Current (A) | Creepage Distance (mm) | AC Dry (kV) | BIL (kV) | Standard |
1 | 12/250/P1 P2 Type 1 | 6270 | Brown(RAL8016) | 12 | 250 | 260 | 30 | 75 | EN 50180 |
2 | 12/250/P4 24/250/P2 Type 2 | 6387 | Brown(RAL8016) | 12-24 | 250 | 490 | 55 | 125 | EN 50180 |
3 | 24/250/P3 36/250/P1 Type 3 | 6440 | Brown(RAL8016) | 24-36 | 250 | 605 | 77 | 170 | EN 50180 |
4 | 24/250/P4 36/250/P3 Type 4 | 6599 | Brown(RAL8016) | 24-36 | 250 | 935 | 77 | 170 | EN 50180 |
5 | 36/250/P4 Type 5 | 6599A | Brown(RAL8016) | 36 | 250 | 1165 | 77 | 170 | EN 50180 |
6 | 12/630/P3 Type 6 | 6318 | Brown(RAL8016) | 12 | 630 | 315 | 30 | 75 | EN 50180 |
7 | 12/630/P4 24/630/P2 Type 7 | 6408 | Brown(RAL8016) | 12-24 | 630 | 490 | 55 | 125 | EN 50180 |
8 | 24/630/P4 36/630/P2 Type 8 | 6506 | Brown(RAL8016) | 24-36 | 630 | 760 | 77 | 170 | EN 50180 |
9 | 36/630/P4 Type 9 | 6598 | Brown(RAL8016) | 36 | 630 | 1155 | 77 | 170 | EN 50180 |
10 | 12/1250/P4 Type 21 | 6363 | Brown(RAL8016) | 12 | 1250 | 385 | 30 | 75 | EN 50180 |
11 | 24/1250/P3 Type 22 | 6428 | Brown(RAL8016) | 24 | 1250 | 620 | 55 | 125 | EN 50180 |
12 | 24/1250/P4 36/1250/P3 Type 23 | 6523 | Brown(RAL8016) | 24-36 | 1250 | 920 | 77 | 170 | EN 50180 |
13 | 36/1250/P4 Type 24 | 6638 | Brown(RAL8016) | 36 | 1250 | 1145 | 77 | 170 | EN 50180 |
14 | 12/2000-3150/P4 Type 25 | 6363A | Brown(RAL8016) | 12 | 2000-3150 | 385 | 30 | 75 | EN 50180 |
15 | 24/2000-3150/P3 Type 26 | 6428A | Brown(RAL8016) | 24 | 2000-3150 | 620 | 55 | 125 | EN 50180 |
16 | 24/2000-3150/P4 36/2000-3150/P3 Type 27 | 6523A | Brown(RAL8016) | 24-36 | 2000-3150 | 920 | 55 | 125 | EN 50180 |
17 | 36/2000-3150/P4 Type 28 | 6638A | Brown(RAL8016) | 36 | 2000-3150 | 1145 | 77 | 170 | EN 50180 |
Selection and Considerations
Core Selection Basis: Primarily select the bushing specification based on the transformer's maximum voltage (12kV/24kV/36kV) and rated current (250A-3150A).
Insulation and Pollution Resistance: Choose models with adequate creepage distance according to the pollution level at the installation site (P1-P4) to prevent flashover.
Sealing and Oil Level: Since it is oil-filled, ensure good sealing between the bushing and transformer cover during installation to prevent oil leakage or moisture ingress.
Corrosion Considerations: In corrosive environments, it is recommended to use products with conductors specially treated with tin or silver plating to improve corrosion resistance.