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126 巻, 6 号
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松本 聡2006 年 126 巻 6 号 p. 574-577
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーThis paper deals with the recent topics related to sensing, monitoring, and diagnosis for electric power equipment. Moreover the risk management for such equipments has been an object of study in many terms such as economical, technical aspects, safety and rest, CSR (Corporate Social Responsibility) etc. The relationship between the function of the economic engineering and the maintenance strategy for electric power system are reviewed.抄録全体を表示PDF形式でダウンロード (348K)
特集論文
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金子 正光, 上田 隆司, 竹之内 修, 大坪 昌久, 本田 親久, 鶴田 芳男, 岩元 秀樹, 徳満 明博2006 年 126 巻 6 号 p. 578-585
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーThe establishment of Condition Based Maintenance for hydrogenerators is very important for monitoring the conditions of stator windings insulation. On-line partial discharge (PD) testing has been used to provide useful information for monitoring the integrity and diagnosing problems in hydrogenerator stator winding insulation. The on-line insulation diagnosis technology can assess thermal, electric, ambient, and mechanical stresses received by the hydrogenerator stator windings. We have already indicated in a previous study that on-line PD measurements using acoustic emission sensor (AE) techniques can be useful for assessing the conditions of stator winding insulation. In this paper, the relationship between AE signals and maximum discharge magnitude was investigated in a non-destructive test for hydrogenerators using off-line measurements. AE signals were investigated by the use of multiple AE sensors, which are produced from an internal discharge for two hydrogenerator stator windings in 11kV and 13.2kV classes, in addition to the load and temperature, and humidity measurements taken on-line in twenty-month and three-month long studies respectively.抄録全体を表示PDF形式でダウンロード (963K) -
愛澤 忠良2006 年 126 巻 6 号 p. 586-591
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーMost general-purpose analyzers for harmonic analysis on distribution lines are designed to sample the data of one or two power supply periods. In other words, these analyzers process waveforms and display the results based on the assumption that the analyzed waveforms do not contain non-integral components, such as subharmonics and interharmonics. When waveforms containing non-integral components are analyzed with these general-purpose analyzers, the results often indicate as if hardly existing components were contained.
This paper proposes a technique of waveform judgment and explains its application method. The technique enables the judgment of non-integral components in analyzed waveforms through the use of a type of Lissajou's figure and clarifies the component types and also the time window necessary for appropriate analysis.抄録全体を表示PDF形式でダウンロード (645K) -
小林 隆幸, 湯浅 禎之, 名倉 徹, 林 朋宏2006 年 126 巻 6 号 p. 592-597
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーRecently we experienced gas leak trouble of a hollow porcelain shell, which had been working in service for more than a few decades. From our investigation, it was found that an alkali-silica reaction might occur in the porcelain body over time depending on the sealing structure, the number of times the porcelain was fired, and the amount of alkali in the cement. This paper describes the mechanism of porosity change in porcelain body, the factors of such deterioration speed, FEM stress analysis results, and an Ultrasonic Test (UT) for the integrity of porcelain. In addition, the UT inspection results are shown.抄録全体を表示PDF形式でダウンロード (1669K)
論文
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三浦 雅樹, 佐藤 卓也, 岩本 伸一, 栗原 郁夫2006 年 126 巻 6 号 p. 598-604
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーAs the deregulated environment of power systems has been spread in the world, it is essential to operate power systems efficiently and economy. Under the environments, with the advance of communication technologies and sensors, the so-called dynamic rating is now to be realized. The dynamic rating is a method which determines accurate ratings by utilizing real-time information such as conductor temperatures, ambient temperatures and wind speeds. The dynamic rating is considered to increase the thermal capacities of overhead transmission lines and therefore take on importance in the deregulated electric power industry. The importance of the dynamic rating lies mainly in the area of Available Transfer Capability (ATC) improvement. In this paper, the validity of the proposed dynamic rating application is shown from the viewpoint of ATC, especially, ATC with thermal constraints. In addition, the possibilities of ATC estimations using sensitivities are verified on the purpose of reducing calculating time, considering the importance of real time simulation of ATC.抄録全体を表示PDF形式でダウンロード (647K) -
松木 純也, 林 泰弘, 北嶌 俊介, 高橋 雅浩, 村田 憲治2006 年 126 巻 6 号 p. 605-610
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーThis paper presents the results of experimental study on the performance of a Unified Power Flow Controller (UPFC), one of the FACTS (Flexible AC Transmission Systems) controllers. A laboratory-scale UPFC was manufactured and installed on a laboratory electric power system to investigate its multifunctional capabilities as a power flow controller.
The UPFC consists of two 4.5kVA, 200V back-to-back voltage-sourced converters, labeled “Converter 1" and “Converter 2", operated from a common DC link provided by a DC storage capacitor of 380V. It can provide independent control of both the real and reactive power flow in the line. Tests were performed to examine the capabilities of UPFC, under one-machine connected to an infinite-bus system. Steady-state responses under various kinds of operating conditions were measured and analyzed.抄録全体を表示PDF形式でダウンロード (2083K) -
小嶋 尊由輝, 森 啓之2006 年 126 巻 6 号 p. 611-618
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーThis paper proposes a new continuation power flow calculation method for drawing a P-V curve in power systems. The continuation power flow calculation successively evaluates power flow solutions through changing a specified value of the power flow calculation. In recent years, power system operators are quite concerned with voltage instability due to the appearance of deregulated and competitive power markets. The continuation power flow calculation plays an important role to understand the load characteristics in a sense of static voltage instability. In this paper, a new continuation power flow with a variable-step variable-order (VSVO) nonlinear predictor is proposed. The proposed method evaluates optimal predicted points confirming with the feature of P-V curves. The proposed method is successfully applied to IEEE 118-bus and IEEE 300-bus systems.抄録全体を表示PDF形式でダウンロード (326K) -
田能村 顕一, 荒井 純一, 野呂 康宏, 高木 喜久雄, 加藤 政一2006 年 126 巻 6 号 p. 619-626
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーHVDC consisted by self-commutated inverters is able to be applied for power transmission that connecting from a remote large windfarm to weak ac system. Most self-commutated HVDC is applied for connection between two ac systems they have synchronous power sources, but it is not suitable for windfarm that consists of induction generators without synchronous power source. This paper presents new control for the self- commutated HVDC system connected to a large windfarm of induction generators. The effect of the proposed control is shown by EMTP simulation.抄録全体を表示PDF形式でダウンロード (732K) -
熊澤 孝夫, 星野 俊弘, 藤井 茂雄, 前川 洋2006 年 126 巻 6 号 p. 627-634
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーElectromagnetic interference (EMI) due to partial discharges (PDs), which occur at the rubber coatings or the strain insulators of outdoor distribution systems, might cause poor television reception in neighboring housing. It is difficult to identify the EMI with a visual check because the PDs rarely generate light and sound.
We investigate fundamental characteristics such as identifying the direction of a PD source using the time difference between two antennas, and an analog hardware system for calculating the direction from that time difference. The analog system is composed of IC devices such as a filter and a mixer, and also uses signal- processing of intermediate frequency transforming. We confirm the validity of the relationship between the direction of a PD source and the time difference between two antennas, and also confirm the application of a surface acoustic wave (SAW) filter in the analog hardware system. We measure the pulse response of multiple devices, and estimate the linearity between the direction of a PD source and the outputs of multiple devices.抄録全体を表示PDF形式でダウンロード (1837K) -
上田 智之, 駒見 慎太郎2006 年 126 巻 6 号 p. 635-641
発行日: 2006年
公開日: 2006/09/01
ジャーナル フリーIt is well known that adequate dynamic load model is essential for evaluating power system stability. For representing the behavior of actual load, this paper presents a concept of dynamic load model, that is, a variable conductance behind a constant reactance, and also presents a method for determining the reactance from observation point to internal load by using measured data. In all of measured 64 data in major disturbances, the conductance shows much higher value instantaneously after the recovery of voltage sag. The tendency is well explained by the presented concept, but cannot be represented by the traditional static load model. As to the numerical simulation, the behavior of existing loads after instantaneous voltage sag is well represented by a parallel composite of a constant admittance and an induction motor behind a series constant reactance on the CRIEPI-Y-method, which is a typical simulation tool for power system analysis.抄録全体を表示PDF形式でダウンロード (361K)
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