Features of High Voltage Transformers
- ZHONGSHAO ‘s 220kV power transformers use software from well known brands and our proprietary computational verification process to achieve optimal design for core, windings, mounting structures, and oil tank extensions.
- Our 35kV three phase oil immersed distribution transformers feature premium C.R.G.0. core material with high quality oxygen free copper windings. Offering an aesthetically pleasing appearance and safe operation, they are widely used in various sectors nationwide.
- The 35kV three phase oil immersed distribution transformer complies with ANSI C57.12.00 standards. It meets IEC60076, and GB/T6451 (Technical Parameters and Requirements for Three Phase Oil immersed Power Transformers) standards.
- Our factory holds over 100 patents in transformer and electrical equipment technology, materials, design, and R&D.
- With an annual production capacity exceeding 20,000 transformers and electrical devices, ZHONGSHAO is committed to delivering efficient and professional power solutions. We welcome your inquiries and requests for quotations.
Professional High Voltage Transformer Manufacturer In China
Our high voltage transformers feature a compact design incorporating advanced domestic and international technologies. Components such as the core, windings, and oil tank (for oil immersed high voltage transformers) have been optimized for performance. They are widely applicable across various sectors including industrial, mining, and building power distribution systems.
As for the after sales support, if any quality issues arise with the sold high voltage transformers, or if you require technical assistance, maintenance, or repairs, we will promptly assist you in resolving the matter.
Has automatic energy distribution and power transformer, less overheating with manufactured heat dissipation.
An ideal application with great energy distribution, can withstand overload and equipped with heat-dissipating housing.
Withstands overload capacity and power supply, natural cooling method built with safety measures for fewer incidents.
Has durable materials, withstands high-voltage and manufactured with great temperature control.
Has eco-friendly and has less overload, Withstands high voltages and fast energy distribution. There is energy-saving and high-quality power storage.
Stabilized is energy distribution and reliable environmental-friendly support. The transformer substation is enhanced durability.
Safety measures and strong overload capacity, great high efficiency and environmental friendly that reduces pollution.
High industrial usage and oil filled transformer type, manufactured with durable materials that ensures better functionality.
What is a High Voltage Transformer?
Generally speaking, transformers with high voltage side voltages exceeding 10kV are referred to as high voltage transformers. These are employed to handle higher power levels, such as in power plants where voltage is stepped up to higher levels for long distance transmission, or to step down elevated voltages to levels suitable for electrical equipment, enabling normal power usage and operation. Due to the high voltage nature of these transformers, optimized insulation measures are typically implemented to ensure safety and operational stability.
How Do High Voltage Transformers Withstand High Voltage?
To ensure transformers can operate normally under high voltage conditions, high voltage transformers are typically designed with optimized structural configurations. This approach reduces operational losses across components, thereby achieving optimal performance.
More Coil Turns
According to the principle of electromagnetic induction, the number of coil turns is directly proportional to voltage. Therefore, you need more coil turns to handle higher input voltages or to output higher voltage currents. High voltage transformers may use copper coils to provide excellent conductivity for carrying high voltage currents, ensuring stability and current transmission efficiency during prolonged operation.
Better Cooling System
High voltage transformers typically have higher capacities, coupled with core and current losses, which actually generate more heat. Consequently, an efficient cooling system is crucial. For example , we commonly use insulating oil as a heat transfer medium to absorb heat, or incorporate fans to assist in heat dissipation, thereby cooling the transformer and maintaining its normal operating condition.
More Effective Insulating System
A more effective insulation system is equally essential, as the high voltage within transformers subjects them to stronger electromagnetic fields and even risks high voltage breakdown. Consequently, high voltage transformers typically require more robust insulation materials, such as insulating oil and epoxy resin. These materials effectively encapsulate the windings and their gaps, providing excellent isolation to achieve comprehensive insulation. This ensures the safety and reliability of high voltage transformers during operation.
Types of High Voltage Transformers
High Voltage Distribution Transformers
High voltage distribution transformers typically serve as terminal equipment in distribution systems, reducing voltage to suitable levels for electrical devices. They commonly handle voltage levels including 11kV, 22kV, and 33kV. Current that has been stepped down through the distribution transformer is ultimately distributed via switchgear to different circuit systems, providing operational power to various equipment.
Therefore, even though positioned at the terminal stage of the distribution lines, high voltage distribution transformers play a crucial role in the normal operation of equipment. High performance transformers deliver greater power capacity at equivalent ratings, reduce losses, and help minimize costs associated with electricity transmission.
High Voltage Power Transformers
High voltage power transformers are typically positioned at the front end of distribution lines, enabling long distance current transmission by adjusting voltage levels. Their most common applications include large scale industrial sectors such as power plants and substations. Capable of handling voltages above 110kV, these transformers demand higher structural and performance standards. Consequently, high voltage power transformers require optimized structural designs, including enhancements to components such as cores, casings, and windings to improve operational reliability and ensure extended service life.
High Voltage Dry Type Transformers
High voltage dry type transformers typically use epoxy resin as their insulation material. This resin effectively fills gaps between windings, ensuring tighter adhesion for superior insulation and dust proofing. It prevents high voltage breakdown even in harsh environments with dust or moisture, without compromising insulation performance. Compared to oil immersed transformers, its advantages include reduced risk of fire or explosion, making it safer and more friendly to the environment.
The Application Areas Of a High Voltage Transformers
Power Plants
Within power plants and substations, high voltage transformers can step up the voltage to levels that are suitable for long distance transmission. In such applications, the voltage level of high voltage transformers typically need to exceed 10kV.
Substations
Within substations, high voltage transformers are used to step down voltage for integration into local distribution networks, enabling the normal operation of electrical equipment. These transformers must maintain stability during continuous operation, so it is essential for you to select high voltage transformers with superior insulation and heat dissipation capabilities in this area.
Industrial Production Line
On industrial production lines, high voltage transformers serve to step down voltage to levels compatible with the operational requirements of various electrical equipment. For industrial production, the required equipment typically demands high operating power. And you may need to select the transformers with higher capacity to deliver sufficient voltage for stable operation and sustained production capacity. Additionally, surface treatments such as corrosion protection may be necessary to withstand industrial environments.
Medical Devices
While in the medical field, the role of high voltage transformers is far away from just converting the voltage to power equipment. High precision medical instruments like X-ray machines will have higher demands for the safety and stability in the power supply, thus the insulation capabilities of high voltage transformers are equally important. Additionally, you must ensure their operational noise does not disrupt the medical environment.
Moreover, as for the medical safety, epoxy resin proves a more suitable insulating material. Unlike insulating oil, it reduces the risk of leakage and potential contamination. However, if your applications require power to higher voltage equipment, you also can choose the insulating oil high voltage transformers to achieve greater capacity.
New Energy Systems
With today’s technological advancements, high voltage transformers are also being used in the new energy sector. They convert the voltage of electricity generated by wind and photovoltaic power, enabling its integration into distribution networks to serve people’s daily lives.
How To Choose The Right High Voltage Transformers?
Rated Voltage
Rated voltage is a critical parameter when selecting high voltage transformers, it refers to the maximum voltage the transformer can withstand during operation. You can reference this based on specific applications, for example, power high voltage transformers used in power plants require a carrying capacity exceeding 110kV, while high voltage transformers for distribution may only need a carrying capacity above 11kV to supply residential power.
Capacity
Capacity represents a transformer’s ability to deliver a stable power supply. For single phase current, you can directly multiply the rated voltage of your electrical equipment by its rated current. For three phase AC, due to the 120° phase angle between voltages, you must multiply the rated voltage by the rated power and then multiply that result by the square root of three. then, you can select a transformer with a rated capacity exceeding this calculated value to ensure sufficient operational capability.
Cooling Method
Cooling methods are also necessary considerations. Under high load conditions, inadequate cooling can cause equipment failure or damage due to overheating, significantly shortening its service life.
Common cooling methods for high voltage transformers include oil cooling or air cooling. If your equipment requires prolonged continuous operation under high voltage or heavy loads, the heat absorption capacity of insulating oil provides superior thermal dissipation.
Installation Environment
When making specific selections, you must also base your decision on the actual operating environment. If your high voltage transformer will operate in dusty, high temperature, or corrosive conditions, you need to confirm before purchasing whether it features dust proof or corrosion resistant structural design.
You also can describe the specific environmental conditions to the customer service before placing your order and verify the product’s relevant performance specifications. This ensures you acquire a suitable high voltage transformer capable of long term reliable operation.
Qualification Certification
Last but not least, for electrical products, the safety test certificates or relevant standard certifications for transformers can not be ignored. These certifications demonstrate that the product is free from quality issues and fully compliant with regulations, providing you with the most fundamental level of assurance.
Common product certifications and standards include IEC, IEEE, ISO 9001 Quality Management System Certification, ISO 45001 Occupational Health and Safety Management System Certification, and others. If you are purchasing a three phase high voltage transformer, you should also verify whether it holds certifications such as ANSI C57.12.00, IEC 60076.
We provide a two years warranty and lifetime technical support, you only need to be responsible for the cost of materials.
ZHONGSHAO ‘s electrical products are certified under the ISO 9001 Quality Management System and ISO 45001 Occupational Health and Safety Management System, while implementing environmental management systems and the OHSAS 18000 Occupational Health and Safety Management System. Our 35kV three phase oil immersed distribution transformers also comply with standards including ANSI C57.12.00, IEC 60076. You can trust the safety of our products.
For custom orders or products with special specifications, we ensure timely delivery as stipulated in the contract.
Moreover, before the shipment, we will strictly conduct production inspections in strict compliance with standards. Products are only released after meeting all technical requirements, accompanied by type test reports and factory inspection reports issued by nationally authorized inspection authorities.
