著者

横水 康伸 松村 年郎 鬼頭 幸生

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.119, no.7, pp.834-839, 1999-07-01 (Released:2008-12-19)

参考文献数

3

---

Experimental investigation on short-circuit phenomenon through ejected hot gas between source-side terminals in molded case circuit breakers (MCCB's) was performed. The occurrence rate of short-circuit phenomenon proved to increase with the peak value of breaking current and with the order of breaking test. The conductance of the ejected hot gas was also found to rise with the peak value of the breaking current and with the order of the breaking test. These results indicate that the hot gas with high conductance causes the short-circuit phenomenon to happen. Then some effective means were taken in the MCCB to reduce the conductance of the hot gas. Decreasing in the conductance of the hot gas successfully prevented the short-circuit phenomenon from occurring.

著者

三澤 哲也

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.125, no.5, pp.457-460, 2005 (Released:2005-08-01)

参考文献数

18

---

Recently, the wholesale electric power exchange has been founded in Japan. With the progress of the electricity market, some management schemes of electricity price risk will be necessary. In financial markets or the preceding electricity markets, various “derivatives" on assets in the markets are often used as management tools to hedge the price risk. This paper gives a short commentary on some fundamental concepts of the derivatives and the pricing theory in the financial engineering, and discusses the problems on the financial engineering approach to electricity derivatives.

著者

小薗 秀明 谷水 徹

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.128, no.12, pp.1423-1426, 2008-12-01 (Released:2008-12-01)

参考文献数

10

被引用文献数

1

---

Vacuum Circuit Breakers (VCBs) have been widely used for medium voltage level, because of their performance: compact size, light weight, maintenance free operations and environment-friendly characteristics. They become most comfortable breakers for our needs from other breakers: oil, air, magnetic blast and gas. In this paper the history of vacuum, and latest trends of circuit breakers and related technologies are described, as well as merits or demerits of using vacuum technologies.

著者

仲村 宏一 山城 迪

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.119, no.2, pp.284-290, 1999-02-01 (Released:2008-12-19)

参考文献数

8

被引用文献数

5 6

---

The objective of this study is to estimate customer interruption cost by analyzing survey responses and comparative examination between it and the estimation value by the economic macro method or the example of America and Canada. The power interruption cost is considered as one of the useful index for evaluating the expansion planning or the operation of power system facilities from reliability. It is also considered to become more important index in the recent development of integrated resource planning in which both supplier's and customer's resources are equally dealt with. This paper reports the estimation results of customer interruption costs based on the three years survey from 1992 to 1994 conducted in HOKKAIDO and for various kinds of customers.

著者

竹田 正俊

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.129, no.7, pp.855-858, 2009-07-01 (Released:2009-07-01)

参考文献数

7

被引用文献数

1 2

---

The self-commutated Static Var Compensator (STATCOM) is expected as one of the most effective tools to enhance power system stability and has been applied world-widely in recent years. Since the first prototype of STATCOM was developed in Japan in 1980, continual efforts by utilities and manufactures drove the development forward to the practical application of STATCOM, resulting in the world-first application of 80MVA STATCOM using GTO thyristors in 1991, followed by the 80MVA STATCOM using GCT thyristors in 2003. Since then, the application of STATCOM has been extended to not only power utility systems but also industrial systems. This paper describes historical development events and engineer's efforts to develop the STATCOM, including some episodes.

著者

中西 要祐 安田 陽 辻 隆男 西尾 宣俊

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.139, no.10, pp.NL10_9, 2019-10-01 (Released:2019-10-01)

著者

中村 貴弘 早川 正士

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.124, no.8, pp.1012-1020, 2004 (Released:2004-11-01)

参考文献数

17

被引用文献数

2 3

---

Mesospheric optical phenomena(including sprites) are becoming an interesting subject from the standpoint of atmosphere-ionosphere coupling. This paper deals with our observation of sprites associated with winter thunderstorms in the Hokuriku area and we show the characteristics of those sprites and their parent lightning discharges. Although the scale of Japanese lightning in winter is very small as compared with the MCS (Mesoscale Convective System) for the summer continental lightning, the essential quantities (polarity, charge transfer etc.) are found to be nearly the same as those for those MCS. However, there might be required an additional factor, such as the self-organization of the lightning.

著者

辻本 富幸 中出 雅彦 八木 幸弘 石井 登

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.125, no.12, pp.1237-1244, 2005 (Released:2006-03-01)

参考文献数

14

被引用文献数

4 5

---

Water tree is one of the degradation aspects of XLPE cables used for under-ground distribution or transmission lines. We have developed the loss current method using 3rd harmonic in AC loss current for cable diagnosis. Harmonic components in loss current arise as a result of the non-linear voltage-current characteristics of water trees. We confirmed that the 3rd harmonic in AC loss current had good correlation with water tree growth and break down strength. After that, we have applied this method to the actual 66kV XLPE cable lines. Up to now, the number of the application results is more than 120 lines.In this method, it is sometimes said that the degradation signal (3rd harmonic in loss current) is affected by the 3rd harmonic in the test voltage. To indicate and solve this problem, we investigated the extent of influence by 3rd harmonic in the test voltage, and found the rule of the influence. As a result, we developed a new technique of harmonic-noise reduction in loss current method that enabled a more highly accurate diagnosis and confirmed the effectiveness of this new technique by simulations and experiments with actual cables.

著者

渡邊 誠 小丹枝 和二 中村 脩 栗岡 英明 福居 助憲 辻 克典

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.115, no.1, pp.18-23, 1994-12-20 (Released:2008-12-19)

参考文献数

4

被引用文献数

4 8

---

Considering the fact that most problems in distribution lines are ground faults, we think that the technology to distinguish the causes in the distribution lines will be very useful in preventing faults beforehand or, at least finding any problems at an early stage. We analysed the waveforms of ground faults which were collected from data concerning problems in the districution lines and ground fault experiment. We then studied the possibility of technology which could predict classified groups drawn from the scale of Io (the waveform of ground fault's current) and Vo (the waveform of ground fault's voltage), and both of them in the ground faults. The results demonstrated that Io could be classified into three groups, that is, leaking ground faults are sine curve shaped, gap discharge ground faults are triangular and intermittent discharge ground faults are needle shaped. Also we calculated simulated equivalent impedance of the causes of ground faults by EMTP. Furthermore, we investigated the influence coused by the condition of the distribution lines. With these results, we proposed a technique which could predict the cause of problems in ground faults.

著者

市川 建美 植田 清隆 沢田 辰男 武藤 栄 住田 侑

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.105, no.1, pp.47-54, 1985

著者

犬塚 博 稲田 英教

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.120, no.11, pp.1424-1430, 2000-11-01 (Released:2008-12-19)

参考文献数

5

---

We have developed a new method to measure an attenuation characteristic of a power cable in high frequency range. The method numerically obtains an attenuation characteristic by suppressing an influence of reflections caused by impedance mismatching. The correction equations are derived from the relation of forward waves and backward waves with multiple reflections in the cable.

著者

白崎 圭亮 岡田 有功 佐野 憲一朗 岩月 秀樹

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.138, no.8, pp.651-658, 2018-08-01 (Released:2018-08-01)

参考文献数

11

被引用文献数

3

---

Flicker may be caused by “frequency feedback method with step injection of reactive power” installed in PCS which is generally used as grid-connected inverter in Japan. Therefore, in this paper, characteristics of the flicker were investigated by experiments with actual PCS in single phase circuit. Furthermore, effective means for suppressing the flicker was considered by taking the cause of occurrence of flicker into account. Moreover, it was clarified the differences among PCSs on flicker using multiple actual PCSs. In conclusion, gain of frequency feedback function should be reduced as one of effective means to avoid flicker.

著者

萩田 泰晴

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.137, no.3, pp.NL3_10-NL3_13, 2017-03-01 (Released:2017-03-01)

参考文献数

5

著者

田辺 一夫

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.117, no.8, pp.1173-1180, 1997-07-20 (Released:2008-12-19)

参考文献数

9

---

The audible noise which is produced by corona discharge from transmission line conductors is composed of two major components, namely “hum noise” and “random noise”. Hum noise has a frequency of twice the power line frequency and is generated primarily in rain, fog, and highly humid environments. It is one of the major factors affecting conductor design of transmission lines for voltages above 500kV and it is very important to predict level of hum noise near transmission lines. In this paper, through comparison between measured values in the UHV Akagi test line and that using corona cage, an experimental prediction method of hum noise in rain condition is proposed.

著者

間屋口 信博 餘利野 直人 嶋村 悠太 谷岡 佳紀 佐々木 豊 造賀 芳文

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.139, no.4, pp.234-239, 2019-04-01 (Released:2019-04-01)

参考文献数

7

被引用文献数

3

---

In this paper, we show the result of building and simulating a model that can optimally operate electric power supply by a system combining Photovoltaic Power Generation (PV) and Storage Battery (BT), mainly for residential customers. Especially focusing attention on BTs, by solving the objective function that minimizes electricity charges of customers by using the internal temperature and life characteristics of the storage battery as constraint conditions, an optimal solution is obtained. Compared with the case where the constraint condition of the storage battery is not taken into consideration, although the electricity charge increases, it is evaluated that the system can be used stably for a long time. Also, in a system that combines PV and BT, DC power bus (DC Bus) is controlled to a constant value for the purpose of supplying electric power to DC load and stable power supply to AC load.

著者

矢部 邦明 林 泰弘

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.138, no.2, pp.175-182, 2018-02-01 (Released:2018-02-01)

参考文献数

12

被引用文献数

1 3

---

This paper presents an evaluation of economical capacity of storage batteries equipped with residential PV systems. In around 2019, many of power companies' ten-year contracts with PV system owners will come to expire, pushing down the selling price of PV generated energy. This, if combined with a declining battery price, would make it more economical to self-consume PV generated energy than selling the electricity to the utilities. The authors explore the optimized storage battery capacity and charge-discharge pattern by using load and PV output data of 200 houses, and by linear programming. Results show 5.8kWh battery is suitable for an average house with 4.5kW PV system when the battery system price is about ¥60,000/kWh. The authors analyze the daily storage start timing's impact on reverse power which affects power system operation, the optimum combination of PV and battery capacity, and each house's deciding factors for optimum storage capacity and so on.

著者

矢部 邦明 林 泰弘

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.139, no.5, pp.363-371, 2019-05-01 (Released:2019-05-01)

参考文献数

17

被引用文献数

6

---

This paper presents economic evaluation of storage battery systems which increase the self-use of PV output at houses and buildings. The selling price of PV generated energy is decreasing. Battery energy storage systems (BESS) can increase the self-use of PV output, and decrease the volume of buying electric power. So, the introduction of BESS to houses and buildings equipped with PV systems will be economical when the price of BESS is decreased enough. Authors investigated the optimum BESS capacity and hourly charge-discharge pattern for a year, then evaluated annual cost. Daily load pattern of each house and building, and time-of-use electric rates affect the conditions to make BESS cost-effective. Such conditions are shown in this paper.

著者

山口 雅英 伊賀 淳 石原 薫 和田 大志郎 吉井 清明 末田 統

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.123, no.3, pp.402-411, 2003 (Released:2004-03-31)

参考文献数

21

被引用文献数

11 14

---

In this paper we examine the merits that a practical photovoltaic system combining photovoltaic generation with storage batteries would provide if used in ordinary residences. Various configurations and operation methods could be envisaged for such a system. In this research we examined the optimal battery capacity, operation methods, and economic effects for a system emphasizing economical merits for the user. We first calculated the hourly amount of photovoltaic generated electricity each month, and used data on average load patterns from actual measurements to calculate battery capacity. Next, taking battery capacity and photovoltaic module capacity/price as parameters, we calculated and evaluated the economic merits for ordinary residences. The results showed that the optimal battery capacity for combination with 3 or 5 kW photovoltaic generation is around 10 kWh, and that a combined system provides merits even though it entails higher photovoltaic module costs than the use of photovoltaic generation alone.

著者

田村 淳二 世永 茂 松村 喜治 久保 宏

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.122, no.10, pp.1129-1130, 2002-10-01 (Released:2008-12-19)

参考文献数

4

被引用文献数

3 3

---

Recently the wind power generation has attracted special interest and many wind power stations are being in service in the world. In the wind power stations, induction machines are mostly used as a generator. Since induction machines can become unstable during a fault in power system, like a step-out of synchronous machines, it is important to analyze the stability of power system including wind generators. This paper presents a consideration on the stability of induction generators from a point of view of voltage stability.

著者

蔦田 広幸 平位 隆史 香山 治彦 伊藤 弘基 宇佐美 照夫

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.121, no.7, pp.822-829, 2001-07-01 (Released:2008-12-19)

参考文献数

7

被引用文献数

1 1

---

Synchronous switching controller (SSC) for gas circuit breakers (GCB) has been developed. SSC is able to close and open a GCB at the appropriate point on wave for minimizing the switching surges. This paper proposes the new synchronous switching algorithm to minimize the control delay time, and the control error for the desired point on wave. New algorithm for (1) detecting voltage and current zero crossing points and (2) predicting the next operation time of GCB is introduced. 145kV GCB with SSC built in new algorithm has been tested several condition. SSC performed well from-30 degrees C to 60 degrees C at various control voltage condition and the standard deviation from the taget phase is within 0.5msec. And the closing at two target points with voltage zero and peak works well in a capacitive load circuit at 145kV.