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This section provides an overview for transformer bushing as well as their applications and principles. Also, please take a look at the list of 14 transformer bushing manufacturers and their company rankings. Here are the top-ranked transformer bushing companies as of December, 2024: 1.PREIS Group, 2.RHM International, LLC, 3.GIPRO GmbH.
Table of Contents
A transformer bushing is a component that provides electricity while supporting electric wires using transformer insulation.
Electric wires need to be supported because they are affected by gravity, but if they are supported by metal parts, they will cause ground faults and short circuits. Therefore, they must be robustly supported by insulators, resin, or other insulating materials. Transformer bushings play a crucial role in supporting and insulating the wires, as well as transmitting electrical energy.
It has high insulation performance and can insulate both the high-voltage side and the low-voltage side in a transformer. Generally, bushings with larger isolation distances are used on the high-voltage side.
With proper maintenance and inspection, transformer bushings are long-lasting and highly reliable components. They contribute to the stability and supply reliability of the power infrastructure.
Transformer bushings are used in transformers and peripheral equipment. Peripheral equipment includes bus ducts and anti-collision plates. Applications include power distribution plants and substations.
Power distribution plants are facilities that branch power lines and distribute power. They often have transformers, which convert high-voltage lines to low-voltage lines for easier handling. Transformer bushings are used at the junction points of high-voltage transmission lines and low-voltage distribution lines to provide isolation in the transmission and distribution of power.
Transformer substations are facilities that receive high-voltage power from transmission lines, convert it to low-voltage power, and supply it to general consumers. Transformer bushings ensure the insulation performance of transformers and prevent ground faults and short circuits in transformers. This improves the safety and reliability of the receiving substation.
Transformer bushings are components that efficiently and safely transmit electric power while insulating electric wires. Its structure is based on a combination of insulators and conductors.
The most important function of a transformer bushing is to completely insulate the charging section. This prevents electrical ground faults and short circuits. Insulation is provided by insulating materials, which typically include ceramic, glass, and polymers (plastics). Transformer bushings have conductors inside to transmit electrical energy from the high-voltage side to the low-voltage side.
These conductors are made of highly conductive materials such as copper or aluminum to ensure reliable current transmission. Transformer bushings are attached to the transformer itself or to equipment at the receiving substation to establish a power transmission path. The high voltage side is often connected to transmission lines or transformers, while the low voltage side is connected to the power distribution system.
When selecting a transformer bushing, several important factors should be considered. The following are transformer bushing selection factors:
The voltage level of the transformer bushing should be selected to match the voltage level of the wires to which it will be connected. It is important to comply with the voltage range designed for safe operation within the specification voltage range. Bushings for high voltage and special high voltage are sold, with special high voltage bushings available for 66kV, 154kV, 275lV, and other types.
The insulating material of the bushing is important to insulate the charging section. Common insulating materials include ceramic and polymer (plastic). Ceramic insulators are robust and less susceptible to contamination, while polymer insulators are easier to mass produce and process.
The allowable current of a bushing indicates its performance with respect to current loading. It is necessary to select a bushing that matches the design current of the transformer and has the allowable current capacity to handle the load.
The dimensions of the bushing must match the design of the transformer and peripheral equipment. It is important to select bushing dimensions for the high voltage side and the low voltage side and plan to fit into the installation space.
When used outdoors, the bushing's resistance to contaminants is important. Especially in salt-affected areas, it is necessary to minimize the adhesion of contaminants by surface treatment of the bushing. Transformer bushings for protection against salt damage are also available.
*Including some distributors, etc.
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Jiangxi Johnson Electric Co. Ltd., established in 2016 and headquartered in Pingxiang, Jiangxi, China, is a manufacturer of composite power insulators. The company's main products include glass insulation, composite insulation, and porcelain insulation. It also produces a range of power fittings using its insulator technology, which are used in transformers and other power grid components such as lighting arrestors, long rod insulators, and composite polymer strings. The company's services include private label manufacturing, and it also offers full OEM services.
Siemens Energy is a manufacturer and supplier of energy technology since 2020 and is headquartered in Munich, Germany. They design, manufacture and provide energy technology solutions that suit specific application requirements. Their offerings include power and heat generation, grid technologies, and renewable energy solutions like wind energy, and energy services aimed at optimizing performance and achieving maximum output. Siemens Energy provides services and products to a wide range of industries, including power generation, transmission and distribution, renewable energy, and industrial operations. Their products and services help these industries improve their energy efficiency with sustainability.
Dalian Hivolt Power System Co. Ltd., established in 1990 and based in Dalian, Liaoning, China, is an ISO 14001-certified manufacturer of insulators and related components for transmission or distribution lines. The company offers composite insulators for lightweight and durable insulation, porcelain electrical insulators for high-voltage transmission lines, and glass insulators for applications requiring mechanical strength. It also offers related components for power transmission or distribution lines, and additional customer services including product testing. The company’s products are primarily used by clients in power transmission, electrical engineering, and power engineering operations.
CHALLENGE INDUSTRIAL CO., LTD., established in 1974 and based in Taipei, Taiwan, is a manufacturer, supplier, and distributor of indoor and outdoor current and potential transformers. The company also produces products such as electronic energy meters, distribution transformers, electrical reactors, and resin insulators, besides offering electrical and electronic equipment to different industries and businesses. All its products are used in revenue and switchboard applications and supplied to power, engineering, and construction firms in different countries such as Japan, Canada, Russia, the United States, and other countries.
Hitachi Energy Ltd., established in 2018, based in Zurich, Switzerland, is a global technology supplier that is advancing a sustainable energy future. The company manufactures and supplies a comprehensive range of capacitors and filter solutions that improves the power quality of electrical networks. They serve customers in the utility, industry and infrastructure sectors with solutions and services across the chain. The company has a proven track record and unparalleled installed base in more than 140 countries. They employ around 38,000 people in 90 countries.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | PREIS Group |
14.1%
|
| 2 | RHM International, LLC |
11.9%
|
| 3 | GIPRO GmbH |
7.8%
|
| 4 | Hitachi Energy Ltd. |
7.8%
|
| 5 | Rajeev Industries |
7.4%
|
| 6 | SANDIAN ELECTRIC |
7.2%
|
| 7 | BUSHING BEIJING HV ELECTRIC CO.,LTD |
6.9%
|
| 8 | CHALLENGE INDUSTRIAL CO., LTD. |
6.9%
|
| 9 | Jiangxi Johnson Electric Co.,Ltd. |
6.7%
|
| 10 | PORCELANAS INDUSTRIALES S.A. |
6.3%
|
Derivation Method
The ranking is calculated based on the click share within the transformer bushing page as of December 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
China
|
2 | 33.3% |
United States of America
|
1 | 16.7% |
|
Germany
|
1 | 16.7% |
|
Taiwan
|
1 | 16.7% |
|
Switzerland
|
1 | 16.7% |
