GB20052-2024

Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers

电力变压器能效限定值及能效等级

GB 20052-2024 est une norme nationale chinoise obligatoire en vigueur : Minimum allowable values of energy efficiency and the energy efficiency grades for power transformers. Secteur : Construction. Thème principal : Sécurité électrique. Entrée en vigueur : 1 févr. 2025.

L’applicabilité dépend du périmètre du produit, de la voie de certification, des avis des autorités et des règles de transition. Demandez une traduction ou vérifiez la source avant d’utiliser cette fiche pour une décision de conformité.

Aperçu de conformité

Cet aperçu n’est actuellement disponible qu’en anglais.

Champ d’application

This standard applies to three-phase power transformers and distribution transformers operating at 10kV to 500kV with specific capacity ranges, including oil-immersed and dry-type variants. It also covers new energy generation side transformers used for photovoltaic, wind power, and energy storage applications at 6kV to 66kV voltage levels. This standard does not apply to gas-filled transformers, tower transformers, or nacelle transformers. It is crucial for manufacturers in the electrical equipment industry to verify if their products fall under these specific categories.

Exigences techniques

The standard categorizes power transformer energy efficiency into three grades, where Grade 1 represents the highest efficiency with the lowest losses. It establishes the minimum allowable values for both no-load losses and load losses under rated capacity conditions. Manufacturers must ensure their products meet the specified loss limits for their respective efficiency grade. A significant update in this version is the inclusion of energy efficiency requirements for new energy generation transformers (photovoltaic, wind, and energy storage). This covers both oil-immersed and dry-type transformers operating at 6kV, 10kV, 35kV, and 66kV voltage levels. Compliance with these new categories is mandatory for relevant products entering the Chinese market. The standard references several technical parameter and requirement standards, such as GB/T 6451 for oil-immersed transformers and GB/T 10228 for dry-type transformers. It also specifies requirements for different core materials, including electrical steel strip and amorphous alloy.

Méthodes d’essai

The no-load loss and load loss of power transformers must be tested according to the methods specified in GB/T 1094.1, GB/T 1094.11, and GB/T 1094.16. These tests are designed to measure the actual energy consumption under standard operating conditions to verify compliance with the established energy efficiency grades.

Questions fréquentes

What products are regulated under GB 20052-2024?

It regulates three-phase power and distribution transformers (10kV-500kV) and newly added new energy generation side transformers (6kV-66kV) for photovoltaic, wind, and energy storage applications.

Are there any updates from the previous version of GB 20052-2024?

Yes, it adds energy efficiency limits for new energy generation transformers and updates short-circuit impedance and load loss limits for several existing transformer categories.

How is the energy efficiency graded in this standard?

Transformers are classified into three grades, with Grade 1 being the most energy-efficient (lowest losses) and Grade 3 being the minimum allowable threshold.

The summary above provides a high-level overview of GB 20052-2024. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 20052-2024 today to access all detailed parameters, tables, and testing procedures.

Indications d’applicabilité

Type: Management
CCS: F01
ICS: 27.010
Autorité compétente: Standardization Administration of China
Comité technique: National Technical Committee on Energy Fundamentals and Management of Standardization Administration of China

Relations

Remplace:GB 20052-2020