Takaoka Electrical Manufacturing Co.

Oyama, Japan

Takaoka Electrical Manufacturing Co.

Oyama, Japan
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Umezawa S.,Tokyo Electric Power Company | Shimada H.,Tokyo Electric Power Company | Sakurai K.,Takaoka Electrical Manufacturing Co. | Miyamoto J.,Mitsubishi Group | And 2 more authors.
International Conference on Power Engineering 2013, ICOPE 2013 | Year: 2013

We developed a centrifugal heat pump system to produce high-temperature water for an industrial process in an actual factory. The heat pump uses a state-of-the-art centrifugal compressor, which results in high efficiency and large heat output. It uses HFC-134a as the refrigerant, and is operated stably and efficiently by a new control technique corresponding to the HFC-134a supercritical cycle. The heat pump generates high-temperature water using the factory's exhaust heat as the low-temperature heat source. Exhaust gases from drying furnaces and an annealing furnace were used as low-temperature heat sources. A thermal storage tank was prepared for these sources, and for adjusting the time difference between the heat demands of the drying system and low-temperature heat source. The result showed that the heat pump system can satisfy drying systems' heat demand while retaining high efficiency. Moreover, this system exhibits CO2 emissions and primary energy consumption than the traditional boiler system.


Umezawa S.,Tokyo Electric Power Company | Amari H.,Tokyo Electric Power Company | Shimada H.,Tokyo Electric Power Company | Matsuhisa T.,Takaoka Electrical Manufacturing Co. | And 2 more authors.
American Society of Mechanical Engineers, Power Division (Publication) POWER | Year: 2011

This paper reports application study of newly developed turbo heat pump for 130 degrees Celsius (°C) water for an industrial process in an actual factory. The heat pump is characterized by high efficiency and large heat output, by using a state-of-the-art turbo compressor. The heat pump requires a low temperature heat source in order to achieve high efficiency. The heat demand is for several drying furnaces in the factory, which requires producing hot air of 120 °C. The heat exchanger was designed to produce the hot air. Experiments were conducted to confirm the performance of the heat exchanger under a reduced size of the heat exchanger. Low temperature heat sources are from both exhaust gas of the drying furnaces and that of an annealing furnace. The heat exchangers were also designed to recover heat of the exhaust gas from the two types of furnace. A thermal storage tank was prepared for the low temperature heat source, and for adjusting the time difference between the heat demand and the low temperature heat source. The size of the tank was determined by considering the schedule of furnaces operations. As a result of the present study, it was confirmed that the heat pump was able to satisfy the present heat demand while retaining high efficiency. Primary energy consumption and CO 2 emission of the heat pump were calculated on the basis of the present results in order to compare them with those of the boilers. Copyright © 2011 by ASME.


Kayaki M.,Kansai Electric Power Co. | Hirata T.,Kansai Electric Power Co. | Kurosawa K.,Chiyoda Corporation | Kondo R.,Chiyoda Corporation | And 2 more authors.
IEEJ Transactions on Power and Energy | Year: 2010

A fault detection system is applied to power lines consisting of both overhead power line and underground power cable in order to detect a fault on the underground power cable section and prevent the automatic reclosing. The fault detection system using optical fiber current sensor has two subjects. The fist subject is that we have to use wound-type current transformer together, when applying the fault detection system to single-core underground power cable. The second subject is that we are not able to detect three-phase short-circuit fault in using the fault detection system. This paper describes that we developed a new fault detection system using optical fiber current sensor by applying the multiplex transmission technology of optical fiber current sensor signal in order to solve these subjects. © 2010 The Institute of Electrical Engineers of Japan.


Nagamoto T.,Takaoka Electrical Manufacturing Co. | Takayama K.,Takaoka Electrical Manufacturing Co. | Kai T.,National Institute of Technology,Oyama College
IEEJ Transactions on Power and Energy | Year: 2010

The variable speed drives of the power electronics application are the most sensitive to the voltage dip that is caused by power system fault. Variable speed drives are composed by the converter, the voltage source inverter and induction motor. They could fall into operation failure by wrong control in the converter when degree of the voltage dip exceeds 15% and 10 ms. Therefore, important loads are equipped with the voltage dip compensation. Since the load characteristic of the converter equals nearly the impedance load, the induction motors connected directly to power supply are more sensitive to the output voltage waveform of the compensator than the converter. Thus, the induction motors are used as the important load (compensated load) on the simulation. The simulations of the compensation performance to the induction motors are carried out by using simulation tool PSCAD/EMTDC. It is confirmed that the goal of the compensation performance is able to be achieved. © 2010 The Institute of Electrical Engineers of Japan.


Kikusato H.,Waseda University | Takahashi N.,Waseda University | Yoshinaga J.,Waseda University | Fujimoto Y.,Waseda University | And 3 more authors.
2014 IEEE PES Innovative Smart Grid Technologies Conference, ISGT 2014 | Year: 2014

Highly accurate predictions of load demand and photovoltaic (PV) output have become possible in recent years because of improved measuring instruments and the increase of databases on load demand and PV output. The appropriate control parameters for actual power system operation can be determined by using these predictions. Although parameters determined by conventional methods are accurate, they may not be determined in time before the beginning of operation because extensive time is required for the calculations. In this paper, the support vector machine - a machine learning method that solves the two-class classification problem - is used to determine the line drop compensator (LDC) parameters instantly. To verify the validity of the proposed method, we carried out numerical simulations to determine the LDC parameters. From the simulated results, we found that the proposed method can instantly and accurately determine the LDC parameters. © 2014 IEEE.


Patent
TAKAOKA Electrical Manufacturing CO. | Date: 2012-09-11

According to one embodiment, a three-dimensional shape measuring apparatus includes at least an aperture plate that is provided with a plurality of confocal apertures which are two-dimensionally arranged to have a predetermined arrangement period, and an aperture plate displacement portion that displaces the aperture plate at a constant speed in a predetermined direction perpendicular to the optical axis direction. Further, the aperture plate is provided with a cover member which is moved integrally with the aperture plate and which includes a transparent body allowing the light beams from the light source to pass therethrough and to be irradiated to the plurality of confocal apertures, and protects the plurality of confocal apertures from dust. Further, an imaging optical system, by which each of reflected light beams is guided to a photo-detector, is designed in consideration of optical properties of the whole optical system including the transparent body of the cover member.


Patent
TAKAOKA Electrical Manufacturing CO. | Date: 2012-09-11

According to one embodiment, a focus position changing apparatus is provided on an optical path of a confocal optical apparatus having a light source and an objective lens and is configured to change a focus position of the objective lens in an optical axis direction of the objective lens. The focus position changing apparatus includes at least a plurality of optical path changing pieces and a rotating plate. Each of the plurality of optical path changing pieces is differ from each other in at least one of a refractive index and a thickness. On the rotating plate, the plurality of optical path changing pieces is arranged along a rotation direction of the rotating plate so as to cross an optical axis of the objective lens. And an anti-reflection layer is formed in a predetermined region on a surface of the rotating plate on a side of the light source.

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