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- New Energy Efficiency Standards Formulated for Transformers (for Building and Factory)
New Energy Efficiency Standards Formulated for Transformers (for Building and Factory)
October 27, 2023
On October 27, 2023, the Ministry of Economy, Trade and Industry (METI) promulgated a public notice that stipulates new standard energy consumption efficiency (energy efficiency standards) for transformers (for Building and Factory.)
1. Background
Under the Act on the Rational Use of Energy, METI has been promoting efforts toward energy efficiency regarding equipment for which it is particularly necessary to improve consumption efficiency. Its approaches include setting energy efficiency standards that relevant manufacturers, etc. are required to meet for their products by the target fiscal year.
Transformers (for Building and Factory) are estimated to consume from 2 to 3% of the total energy generated at a transmission end
as a loss.1 Concerning this fact, a working group2 discussed reviewing the energy efficiency standards for such transformers and compiled a report3 in June 2023, indicating a new target fiscal year, energy efficiency standards, and other matters. In light of this report, on October 27, 2023, METI promulgated a public notice that stipulates new energy efficiency standards and other rules with FY2026 as a target year.
2. Public notice promulgated
Public Notice to Partially Amend the Judgment Standards for Manufacturers, etc. of Energy-Consuming Equipment Concerning the Enhancement of the Energy Consumption Efficiency for Transformers
3. Outline of the new energy conservation standards
（1) Target transformers for Building and Factory
Transformers for Building and Factory whose rated primary voltage exceeds 600 V but are not more than 7,000 V and that are used in AC circuits.
（2) Target fiscal year
FY2026
（3) Categories
（4) Target standard values
The next target standard values for transformers for Building and Factory are shown in the following table.（*4)
| Category | Calculation formula of target standard values involving the energy efficiency standards | ||||
|---|---|---|---|---|---|
| Type | Number of phases | Rated frequency | Rated capacity | Specification | |
| Oil-filled | Single-phase | 50 Hz | Not more than 500 kVA | Standard specification | E = 9.34・(kVA)0.737 |
| Oil-filled | Single-phase | 60 Hz | Not more than 500 kVA | Standard specification | E = 8.60・(kVA)0.744 |
| Oil-filled | Three-phase | 50 Hz | Not more than 500 kVA | Standard specification | E = 14.5・(kVA)0.694 |
| Oil-filled | Three-phase | 50 Hz | Beyond 500 kVA | Standard specification | E = 10.6・(kVA)0.797 |
| Oil-filled | Three-phase | 60 Hz | Not more than 500 kVA | Standard specification | E = 14.4・(kVA)0.681 |
| Oil-filled | Three-phase | 60 Hz | Beyond 500 kVA | Standard specification | E = 8.00・(kVA)0.825 |
| Mold | Single-phase | 50 Hz | Not more than 500 kVA | Standard specification | E = 14.1・(kVA)0.685 |
| Mold | Single-phase | 60 Hz | Not more than 500 kVA | Standard specification | E = 13.3・(kVA)0.692 |
| Mold | Three-phase | 50 Hz | Not more than 500 kVA | Standard specification | E = 16.9・（kVA)0.699 |
| Mold | Three-phase | 50 Hz | Beyond 500 kVA | Standard specification | E = 31.2・(kVA)0.659 |
| Mold | Three-phase | 60 Hz | Not more than 500 kVA | Standard specification | E = 16.2・(kVA)0.702 |
| Mold | Three-phase | 60 Hz | Beyond 500 kVA | Standard specification | E = 17.4・(kVA)0.742 |
| Oil-filled | Single-phase | 50 Hz | Not more than 500 kVA | Semi-standard specification | E = (9.34・(kVA)0.737)・1.10 |
| Oil-filled | Single-phase | 60 Hz | Not more than 500 kVA | Semi-standard specification | E = (8.60・(kVA)0.744)・1.10 |
| Oil-filled | Three-phase | 50 Hz | Not more than 500 kVA | Semi-standard specification | E = (14.5・(kVA)0.694)・1.10 |
| Oil-filled | Three-phase | 50 Hz | Beyond 500 kVA | Semi-standard specification | E = (10.6・(kVA)0.797)・1.10 |
| Oil-filled | Three-phase | 60 Hz | Not more than 500 kVA | Semi-standard specification | E = (14.4・(kVA)0.681)・1.10 |
| Oil-filled | Three-phase | 60 Hz | Beyond 500 kVA | Semi-standard specification | E = (8.00・(kVA)0.825)・1.10 |
| Mold | Single-phase | 50 Hz | Not more than 500 kVA | Semi-standard specification | E = (14.1・(kVA)0.685)・1.05 |
| Mold | Single-phase | 60 Hz | Not more than 500 kVA | Semi-standard specification | E = (13.3・(kVA)0.692)・1.05 |
| Mold | Three-phase | 50 Hz | Not more than 500 kVA | Semi-standard specification | E = (16.9・(kVA)0.699)・1.05 |
| Mold | Three-phase | 50Hz | Beyond 500 kVA | Semi-standard specification | E = (31.2・(kVA)0.659)・1.05 |
| Mold | Three-phase | 60Hz | Not more than 500 kVA | Semi-standard specification | E = (16.2・(kVA)0.702)・1.05 |
| Mold | Three-phase | 60Hz | Beyond 500 kVA | Semi-standard specification | E = (17.4・(kVA)0.742)・1.05 |
（5) Improvement rates of energy efficiency in the target fiscal year
The new standard values in the target fiscal year (FY2026) are estimated to improve by about 11.4% from the actual values in the reference fiscal year (FY2019) on the
4. Promulgation and enforcement
Promulgation: Friday, October 27, 2023
Enforcement: Tuesday, October 31, 2023
Notes:
- These values are estimates from FY2019.
- Working Group on Classification Standards for Transformers (in Japanese)
- Report on Transformers (for Building and Factory) compiled by the Working Group on Classification Standards for Transformers of the Energy Efficiency and Conservation Subcommittee of the Committee on Energy Efficiency and Renewable Energy under the Advisory Committee for Natural Resources and Energy (in Japanese)
- E: Energy efficiency standards for transformers (unit: W)
Division in Charge
Energy Efficiency Strategy Office, Energy Efficiency Division, Energy Efficiency and Renewable Energy Department, Agency for Natural Resources and Energy