Energy Conservation Center, Japan / Evaluation Criteria for Machinery and Appliances / Transformers

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18. Transformers

1) Target Scope:

Limited to transformers for high voltage acceptance of electricity with the rated primary voltage of over 600 and less than 7,000 volts used for alternating current cabling. Transformers described in the ordinance of Ministry of Economy, Trade and Industry, such as those that use gas as insulation and those utility pole models are excluded.

2) Energy Consumption Efficiency:

Energy consumption efficiency is the total loss (W) acquired through the no-load loss and load loss measured using the method stipulated by JIS C4303 and C4306.

3) Category and Target Values:

Category				Standard energy consumption efficiency calculation formula
Transformer type	Number of phase	Rated frequency	Rated capacity
Oil-filled transformer	Single phase	50Hz		E = 15.3S^0.696
		60Hz		E = 14.4S^0.698
	Triple phase	50Hz	Up to 500 kVA	E = 23.8S^0.653
			Over 500 kVA	E = 9.84S^0.842
		60Hz	Up to 500 kVA	E = 22.6S^0.651
			Over 500 kVA	E = 18.6S^0.745
Molded transformer	Single phase	50Hz		E = 22.9S^0.647
		60Hz		E = 23.4S^0.643
	Triple phase	50Hz	Up to 500 kVA	E = 33.6S^0.626
			Over 500 kVA	E = 24.0S^0.727
		60Hz	Up to 500 kVA	E = 32.0S^0.641
			Over 500 kVA	E = 26.1S^0.716

*For transformers that are not used under standard conditions described by JISC4304 and C4036, as well as JEMA standards 1474 and 1475, the target standard value is obtained by multiplying 1.10 for oil-filled transformers and 1.05 for molded transformers to the respective formulas specified in above category.

Remarks:

Oil-filled transformers are transformers that use insulating oil as insulating materials.
Molded transformers are transformers that use resin insulating materials.
E and S express the following numeric values.
E: Standard energy consumption efficiency (unit: W)
S: Rated capacity (unit: kVA)

4) Target Fiscal Year:

1: 2006 for oil-filled transformers
2: 2007 for molded transformers

5) Energy Conservation Effects:

Approximately 30.3% improvement in efficiency compared to 1999 levels in the target year

6) Display Items:

Product name and type, transformer type, rated capacity, number of phases, rated frequency, rated primary and secondary voltage, energy consumption efficiency, standard load factor, name of standard, manufacturer's name

7) Place of Display:

Catalogues that show performance data.
Data provided by the manufacturers when selecting the equipment.

8) Exemption:

Manufacturers or importers who ship less than 100 units in total are excluded, but display obligations must be met regardless of the number of units shipped.

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