Source:JASE-W Japanese Smart Energy Products & Technologies

https://www.jase-w.eccj.or.jp/technologies/index.html

E-46

Keywords

Y2

deviceZ4

electricity

S1

smart grid

E29electrical machinery

Toshiba Industrial Products and Systems Corporation

High-efficiency Transformers Friendly to the Global Environment
Featuresu This is a transformer that uses rapeseed oil to minimize negative impact on
the global environment, including global warming.
u Achieved low loss exceeding the “Top Runner Approach 2014” executedsince 2014
u Excellent flame resistance performance can extend expected life

Basic Concept or Summary
u Transformers using rapeseed oil as an insulating oil lower loss, achieving energy conservation.
Rapeseed oil is a carbon-neutral natural material derived from pressed rapeseeds.
Because the oil is plant-based, it makes transformers more eco-friendly than those using
mineral-derived insulating oil. Because the flash point higher than mineral oil, rapeseed oil is safer inthe event of a disaster.
Structural drawing of a oil-immersed transformer
Secondary(low-pressure)terminal

Low-loss technology
LossSection

Major reason

Low-loss technology

No-loadlossIroncore

Magneticresistance

Improving materials & structure
Thinning iron core

Low-loadloss

CoilElectricresistance

Replacing aluminum with copper
Shortening winding length
Thinning insulators

Primary(high-pressure)terminal
Rapeseed oil(insulation oil isfiled in the tank)

Tank

Energy consumption
efficiency

Coil (winding)Iron core

WeightNo-load loss

Transformers used about thirty years ago
Top Runner Approach 2014
Ultra high-efficiency rapeseed oil transformer
Installation area

Load loss

For 50Hz 3-phase 500kVA

u Comparison of insulating oils: Mineral oil vs. rapeseed oilItem
Insulation and cooling medium

Mineral oil insulation

Rapeseed oil insulation

Mineral oil

Rapeseed oil

Substances mitigating environmental burdens

Fair

Excellent

Substances mitigating environmental burdens

Not contained

Not contained

LCA* (CO2 emission)
Biodgradation performance of insulation oilHigh

Low

Not possible

Possible

152°C

334°C

Insulation performance

Excellent

Excellent

Cooling performance

Excellent

ExcellentFlash point* LCA: Life CYcle Assessment

Rapeseed oil has better flame-retardant featuresdue to higher flash point than mineral oils
(commonly used for hydraulic transformers).

Flash point Mineral oil: 152°C < Rapeseed oil: 334°C

Effects or Remarks

E-46
F-85

u Energy-saving performance is higher than the Top Runner Transformer 2014, meaning that superior
low-loss features drastically cut CO2 emissions and power bills compared to those from thirty yearsago.

(1,000 yen)Transformers used
about 30 years ago

Reduced by 42%

Reduced by 49%

Top Runnertransformers

Ultra high-efficiency
transformers

Transformers used
about 30 years ago

Reduced by 27%

Reduced by 89%

Top Runnertransformers

Ultra high-efficiency
transformers

CO2 emission coefficient: 0.554kg – CO2/kWh (Source: 2014 coefficient indicated in the “Environmental
Action Plan for Electric Industries” issued by Federation of Electric Power Companies in September 2015)
Electric power charge: 16 yen/kWh
Number of workdays: 365/year
Operating time: 24 hours/day
Load rate: 40%
For 50Hz 3-phase 500kVA
u Eco-friendliness• Reduces CO2(zero increase in total atmosphere nitrogen)
Because the plant absorbs nitrogen from therape blossom stage, total atmospheric nitrogen
does not increase even if it emits CO2 during
production process and waste disposal.
(Carbon neutral)Atmosphere

OxygenOxygenAbsorption Generation
TopTopRapeseeds
Photosynthesis

Rapeseed oil
Refining• Prevents soil contamination(Mitigates environmental impact)
If accidentally spilled on the earth,microorganisms can degrade it to minimize
environmental impact.

Oxygen

Disposal
Water

Installation in Practice or Schedule
Domestic

Launched May 2016

Contact:

Toshiba Industrial Products and Systems Corporation
URL: http://www.toshiba-tips.co.jp/contact/Combustion

CO2

Biodegradation