How to Choose a Power Transformer From China?

How to Choose Power Transformer From China

China is one of the most important power transformer producers in the world. You can find almost all styles of power transformers in China.

So, for purchasers who purchase China power transformer needs, how should they choose high-efficiency and energy-saving power transformers?

As a high-quality China power transformer manufacturer, Daelim has the following characteristics:

  • Quick response: Daelim’s predecessor is a transformer trading company. It has excellent service awareness and can quickly adjust it according to your needs.
  • R&D capabilities: Daelim has a team of power transformer designers who have been very experienced. If you need to customize power transformers, Daelim can quickly provide you with design and production services.
  • Word of mouth: Daelim’s power transformers have been supplied to dozens of countries and regions and have gained a good reputation. This also proves that Daelim can provide you with high-quality transformers.
  • Standards: Daelim’s power transformers comply with international standards: IEC.AU, CSA, ANSI. Help you complete the purchase efficiently.
  • Patent: Daelim has a number of patented technologies that can help you better complete power.

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What is a Power Transformer?

A power transformer refers to changing the AC voltage and current value of a power system to another at the same frequency in order to transmit electrical energy.

A static device with two or more windings is used to transmit electrical energy with different voltage and current values in an electric power system.

In the process of electric energy transmission and distribution, the power transformer is the core of energy conversion and transmission.

Its performance and quality are directly related to the reliability of power system operation and operational benefits.

China power transformers are widely used in various fields such as industry, agriculture, transportation, urban communities, and their losses account for about 40% of the power loss of transmission and distribution.

For transformers that are in operation every day and consume a lot of electrical energy, improving power efficiency, reducing energy consumption, and saving electrical energy are the indicators that users are most concerned about.

What Are the Mandatory Standards for Power Transformers in China?

At present, there are mainly two mandatory standards for power transformer energy efficiency indicators in China, namely GB20052-2013.

“Three-phase distribution transformer energy efficiency limit value and energy efficiency rating” and GB24790-2009 “Power transformer energy efficiency limit value and energy efficiency rating”.

Both of these two standards have been implemented for a long time, and the performance parameters specified in the standards have been inconsistent with the current technical requirements.

In order to better promote the energy-saving and consumption reduction of power transformers in China, the new mandatory standard GB20052-2020 “Power Transformer Energy Efficiency Limits and Energy Efficiency Ratings” was officially released on May 29, 2020, and will be on June 1, 2021. It was officially implemented on Japan.

If you need to purchase power transformers from China, you can ask the other party to produce them in accordance with these two standards.

What Are the Naming Methods for Power Transformers in China?

JB/T3837-2016 “Methods for Modeling Transformer Products” stipulates the naming rules for power transformers in China. Transformer Manufacturers in China can voluntarily name power transformers based on this standard.

Generally, the model specifications include information such as the structure type, core material, voltage level, and rated capacity of the power transformer. Under normal circumstances, power transformers are also marked with “-NX1” (first-level energy efficiency) or “-NX2” (secondary energy efficiency) at the end of the model to clarify the energy efficiency level of the product.

Take an oil-immersed power transformer as an example. Its specifications are: high-voltage side voltage 10k V, rated capacity 2000k VA, core material is silicon steel sheet, core structure is a three-dimensional wound core, and its energy efficiency rating is level 1. Use the following method to name the model specification:

S-M·RL-2000/10-NX1. For example, Dalin’s: S(B) H15-M Series Sealed Amorphous Alloy Transformer.

S(B) H15-M Series Sealed Amorphous Alloy Transformer.
S(B) H15-M Series Sealed Amorphous Alloy Transformer.

What are The Key Indicators for Purchasing China Power Transformers?

Choose China transformers according to the use environment. Under normal medium conditions, oil-immersed transformers or dry-type transformers can be selected.

In multi-story or high-rise main buildings, non-combustible or non-combustible power transformers should be used.

In places where dusty or corrosive gas seriously affects the safe operation of the transformer, a closed or sealed power transformer should be selected.

High and low-voltage power distribution devices without combustible oil and non-oil-immersed distribution transformers can be installed in the same room. At this time, the distribution transformer should be equipped with a protective casing to ensure safety.

Choose the transformer according to the electrical load. The selection is usually based on the capacity of the power transformer recommended in GB/T17468-2019 “Guidelines for Selection of Power Transformers”. 

Dry-type transformers should generally be selected in accordance with GB/T1094.12-2013 “Guidelines for Dry-type Power Transformer Loads” and the calculated load Determines its capacity.

Know the insulation class. Insulation grade refers to the heat resistance grade of the insulating material used in electrical equipment, and the insulating material can be

Divided into 7 levels, their temperature rise limits are also different.

The insulation class of commonly used power transformers is between A and H. The insulation class of oil-immersed transformers is generally Class A, and the insulation class of dry-type transformers is generally Class F or H.

Pay attention to the no-load loss. No-load loss refers to when the rated voltage at the rated frequency is applied to the terminals of one winding, the other

The active power is consumed by the winding line terminal when the winding is open.

Load loss refers to the active power consumed at the rated frequency and reference temperature when the rated current flows through the line terminals of one winding and the other winding is short-circuited.

Radial feed Pad-mounted transformer - Power Transformer China
Radial feed Pad-mounted transformer - Power Transformer China

What are the Main Types of Transformers in China?

Main product types and application places

According to the insulating medium, power transformers can be divided into oil-immersed transformers, dry-type transformers, and gas-filled transformers.

Oil-immersed transformers include mineral oil-immersed transformers and high-ignition-point oil (synthetic oil and natural ester) immersed transformers.

Dry-type transformers usually include epoxy resin cast-insulated dry-type transformers and impregnated-insulated dry-type transformers. The transformer should meet the combustion level requirements specified by the Chinese national standards.

The gas-filled transformer is a transformer with non-combustible gas such as sulfur hexafluoride or mixed gas as the insulation and cooling medium. Its body has

It is non-flammable and non-flammable.

Dry-Type Power Transformers - Power Transformer China
Dry-Type Power Transformers - Power Transformer China

What Are the Application Fields of China Power Transformer?

Oil-immersed transformers are widely used in various places, but the fire and safety requirements of the installation place should be fully considered.

High ignition point oil has higher safety performance because its flash point and ignition point are higher than that of mineral oil.

High ignition point oil-immersed transformers are often used in places with relatively high safety requirements, or places with insufficient fire-fighting distance from buildings.

Dry-type transformers are usually used in indoor substations built in conjunction with buildings or underground substations with good waterproof and moisture-proof performance.

Inflatable transformers are usually used in places with higher fire protection and safety requirements.

35V Class Three Phase Oil-Immersed Distribution Transformer

What Factors Affect the Purchase of Transformers?

Confirm the standards that the product meets. When selecting a transformer, it is necessary to clarify the standards that the transformer complies with.

Based on the relevant standards of GB/T1094, usually, oil-immersed power transformers should meet the requirements of GB/T6451, GB/T25438, GB/T25446, JB/T2426, JB/T10317, NB/T42067, and other standards.

Dry-type power transformers should comply with GB/T10228, GB/T22072, GB/T32825, JB/T2426, NB/T42066, and other standards.

If there are other requirements for the product, it should be indicated in the inquiry or bidding documents and clearly stated in the contract.

In principle, it is the most basic requirement for power transformer products to comply with national standards.

Pay attention to energy-saving indicators and certification marks.

GB20052-2020 “Limited Values ​​and Energy Efficiency Grades of Power Transformers” specifies the maximum allowable limits of no-load loss and load loss of power transformers under specified conditions.

According to the “Transformer Energy Efficiency Improvement Plan (2021-2023)”, by 2023, high-efficiency energy-saving transformers (electricity that meets the first and second levels of energy efficiency standards in the newly revised “Power Transformer Energy Efficiency Limits and Energy Efficiency Ratings” (GB20052-2020) The proportion of transformers operating on the grid increased by 10%, and the proportion of new high-efficiency energy-saving transformers that year reached more than 75%).

Starting from June 2021, the newly purchased transformers should be high-efficiency energy-saving transformers.

The China Quality Certification Center uses product certification methods to identify and evaluate the energy-saving indicators of power transformers, and evaluate qualified

The equipment is an energy-saving product, and the equipment manufacturer expresses it through the application of the “section” certification mark to prove that the product has excellent power-saving performance, which is one of the important references when purchasing.

Comprehensive consideration of product indicators. When selecting a China power transformer, it should be based on the overall reliability of the transformer, comprehensively consider the advancement, rationality, economy, and environmental friendliness of the technical parameters, and combine load development, safety requirements, operating environment, operating mode, operating conditions and Loss evaluation methods, etc., put forward reasonable technical and economic indicators and performance evaluation indicators.

At the same time, the possible impact on the safe operation of the system, environmental protection, transportation, installation space, and operation and maintenance must also be considered.

About Bin Dong

Hello, I am Bin, General manager of Daelim which is a leading transformer manufacturer. If you have problems when you are looking for the equipment, what you need to do is tell us.

Custom Power Transformer

If you find that the existing distribution transformer types or power cannot meet your requirements. You can choose to tell Daelim. Daelim has a team that has always had a wealth of design transformers, and can give you a specific design plan in the shortest time.

Daelim’s distribution transformers comply with IEEE, ANSI, CSA, IEC certification, and are used in North America (such as Canada, the United States, Mexico), South America (such as Ecuador, Chile), Europe (such as Spain, Lithuania) and some Asian countries. Daelim even has a professional installation team that can provide you with installation services.