SOUTH KOREA: Metro operators in Seoul, Daejon and Incheon have achieved power savings of more than 20% using ultracapacitor braking energy recuperation technology, according to ultracapacitor manufacturer Maxwell Technologies.
Up to 200 Maxwell Technologies 48 V multi-cell ultracapacitor modules are installed in 750 V and 1·5 kV energy recuperation systems which Woojin Industrial Systems has supplied for seven metro stations, as well as the Korea Train eXpress depot in Seoul. These follow an initial demonstrator installed in Seoul in 2009 under a contract awarded by Korean Railroad Research Institute. Additional installations are planned for 2014-15.
The ultracapacitorsUnconventional internal design yields a larger capacitanceThat property of a system of conductors and dielectrics which permits the storage of electricity when potential difference exists between the conductors. Its value is expressed as the ratio of a quantity of electricity to a potential difference. A capacitance value is always positive. per unit volume than other types. Valuable for high-current and low frequencyThe number of complete cycles or vibrations per unit of time. Rate of alternation in an AC current. Expressed in cycles per second or hertz (Hz). electrical circuits, power supply filters, etc. Applications are similar to those of rechargeable batteries. have been found to operate reliably in temperatures from -40°C to 65°C, and through more than 1 million chargeThe amount of electricity present upon the capacitor's plates. Also, the act of forcing of electrons onto the capacitor's plates. See CoulombA coulomb is the unit of electric charge. It is named after Charles-Augustin de Coulomb.1 coulomb is the amount of electric charge transported by a current of 1 ampere in 1 second. It can also be defined in terms of capacitance and voltage, where one coulomb is defined as one farad of capacitance times one volt of electric potential difference../discharge cycles. ‘UltracapacitorsUnconventional internal design yields a larger capacitanceThat property of a system of conductors and dielectrics which permits the storage of electricity when potential difference exists between the conductors. Its value is expressed as the ratio of a quantity of electricity to a potential difference. A capacitance value is always positive. per unit volume than other types. Valuable for high-current and low frequencyThe number of complete cycles or vibrations per unit of time. Rate of alternation in an AC current. Expressed in cycles per second or hertz (Hz). electrical circuits, power supply filters, etc. Applications are similar to those of rechargeable batteries.’ rapid chargeThe amount of electricity present upon the capacitor's plates. Also, the act of forcing of electrons onto the capacitor's plates. See CoulombA coulomb is the unit of electric charge. It is named after Charles-Augustin de Coulomb.1 coulomb is the amount of electric charge transported by a current of 1 ampere in 1 second. It can also be defined in terms of capacitance and voltage, where one coulomb is defined as one farad of capacitance times one volt of electric potential difference.. and discharge capabilities make them the most efficient option for energy storage and power delivery in braking energy recuperation systems,’ according to Dr Eun K Lee, Vice-President at Woojin Industrial Systems. ‘In addition to being highly efficient in recycling energy that otherwise would be wasted, Maxwell’s ultracapacitorsUnconventional internal design yields a larger capacitanceThat property of a system of conductors and dielectrics which permits the storage of electricity when potential difference exists between the conductors. Its value is expressed as the ratio of a quantity of electricity to a potential difference. A capacitance value is always positive. per unit volume than other types. Valuable for high-current and low frequencyThe number of complete cycles or vibrations per unit of time. Rate of alternation in an AC current. Expressed in cycles per second or hertz (Hz). electrical circuits, power supply filters, etc. Applications are similar to those of rechargeable batteries. operate reliably in low and high temperature environments and have met our expectations for long operational lifetime.’
