Material 3-4

THE RESEARCH COMMITTEE FOR TOTAL ENERGY
THE ENERGY CONSERVATION STANDARDSWORKING GROUPTHE SUB-COMMITTEE FORJUDGEMENT CRITERIAFOR TRANSFORMERSSUMMARY OF FINAL CRITERIA

April 3, 2002

This Sub-Committee deliberated on matters that would serve as criteria for manufacturers andimporters of transformers (hereinafter referred to as "manufacturers and the like") in making
decisions about energy consumption efficiency and the like of transformers and compiled asummary as follows.
1. Scope
Transformers for high-voltage receiving and distribution, excluding gas insulating transformers,
H class dry-type transformers, single-phase transformers with capacity not more than 5kVA orthree-phase transformers with capacity not more than 10kVA, transformers with capacity over
2000kVA, Scott-connected transformers, transformers in mold structure for shared use between
lighting and power, transformers with low voltage output voltage below 100V or above 600V,
forced-air-cooled or water cooled type transformers, and multi-winding transformers.
(See Attachment 1)
2. Judgement Criteria for Manufacturers and the Like (See Attachments 2 to 4)(1) Target year
1) Oil-filled transformers: FY 20062) Mold transformers: FY 2007

(2) Target standard value
Regarding the transformers shipped to the domestic market by each manufacturer or the likein the target years, a weighted average of energy consumption efficiency must not exceed thetarget standard value in each category in the following table. The weighted average iscalculated for each category as follows: first, the energy consumption efficiency should bemeasured by the measuring method set forth in Paragraph (3), and then it should be averaged
using the number of units shipped by each manufacturer as the weight.
[Target Standard Values of Energy Consumption Efficiency]
Product category

Formula for target standards(Note)ClassSingle phase 50 Hz - 500 kVA or less

E=15.3・(kVA)0.696

I

60 Hz - 500 kVA or lessThree phase 50 Hz - 500 kVA or less

E=14.4・(kVA)0.698
E=23.8・(kVA)0.653

II
III-1

50 Hz - over 500 kVA

E=9.84・(kVA)0.842

III-2

60 Hz - 500 kVA or less
60 Hz - over 500 kVA
Mold transformers Single phase 50 Hz - 500 kVA or less

E=22.6・(kVA)
E=18.6・(kVA)0.745
E=22.9・(kVA)0.647

0.651

IV-1
IV-2V60 Hz - 500 kVA or less

E=23.4・(kVA)0.643

VI

Three phase 50 Hz - 500 kVA or less

E=33.6・(kVA)0.626

VII-1

50 Hz - over 500 kVA

E=24.0・(kVA)0.727

VII-2

60 Hz - 500 kVA or less

E=32.0・(kVA)0.641

VIII-160 Hz - over 500 kVA

E=26.1・(kVA)0.716

VIII-2Oil-filledtransformers

No. ofphases

Rated frequency
Rated capacity

E: Total loss (W) of transformer*The reference load factor is 40% for a transformer capacity of 500kVA or less, and 50%for a transformer capacity over 500 kVA.
kVA: Capacity of transformer (kVA)
Note: Regarding target standard values for semi-standard products, the value obtained by thetarget-standards formula for each category is multiplied by the appropriate one of the followingfactors.
Oil-filled transformers
Mold transformers

1.10
1.05

(3) Measuring method (see Attachment 5)
The energy consumption efficiency of the transformer is represented by total loss (W), whichis calculated from the following formula using no-load loss (W) and load loss (W) measured
by the method stipulated by JIS C 4304 and JIS C 4306.
２Total loss (W) = No-load loss (W) + (m/100) x Load loss (W)m: Reference load factor
Transformers with capacity of 500kVA or less: 40 (%)
Transformers with capacity over 500kVA: 50 (%)(4) Labeling method1) Items to be indicated are as follows.
・Product name and model name
・Structure (oil-filled or mold)・Rated capacity (kVA)・Number of phases
・Rated frequency (Hz)・Rated voltage (V)・Energy consumption efficiency (total loss (W))
・Reference load factor (%)
・Standard (Standard (JIS or JEM) or semi-standard)・Name of manufacturer or the like2) Use three or more significant digits (two or more significant digits for 100 (W) or less)when indicating energy consumption efficiency and items to be complied with.
3) Indicate the above items indelibly in an easily viewable place on catalogs containing
performance data and on other documents presented by manufacturers and the like for
equipment selection.
3. Recommendations for Energy Saving(1) Users' Efforts
Users should try to select products with high energy consumption efficiency and appropriate
capacity when purchasing transformers and make efforts to save energy by using transformers
in an appropriate and efficient manner.
(2) Efforts by manufacturers and the like
1) Manufacturers and the like should make efforts to promote technology development forenergy saving of transformers and to develop products with high energy consumption
efficiency.
2) Manufacturers and the like should make efforts to gain users' understanding to promotewidespread use of transformers with high energy consumption efficiency.

(3) Government's efforts
In order to promote widespread use of transformers with high energy consumption efficiency,
the government should try to gain users' understanding and encourage manufacturers' efforts
by taking necessary measures such as assistance policies and encouragement of widespreaduse.
4. Circumstances of Discussion(1) Circumstances leading to organization of sub-committee (see Attachment 6)(2) Committee member list (see Attachment 7)