Meiryo Denshi

Japan

Meiryo Denshi

Japan

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Amau T.,Chubu Electric Power Co. | Kojima K.,Chubu Electric Power Co. | Saka Y.,Chubu Electric Power Co. | Saiki Y.,Meiryo Denshi | And 5 more authors.
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) | Year: 2016

SUMMARY More and more dispersed power sources will be introduced to achieve a low-carbon society. However, many problems may occur as a result of excessive introduction in the current power system. For example, delays or failures of fault detection may occur due to a decline in protective relay sensitivity. This paper proposes a new system of protective relays for distribution lines using section switches with sensors to solve the problem. In addition, experimental results on the proposed system composed of Intelligent Electronic Devices based on IEC 61850 are presented. © 2015 Wiley Periodicals, Inc.


Amau T.,Chubu Electric Power Co. | Amau T.,Nagoya Institute of Technology | Kojima K.,Chubu Electric Power Co. | Saka Y.,Chubu Electric Power Co. | And 6 more authors.
IEEJ Transactions on Power and Energy | Year: 2015

More and more dispersed power sources will be introduced to achieve a low-carbon society in recent years. However, many problems may occur when they are introduced too much in the current power system. For example, it can cause a delay or impossibility of fault detection due to the decline of the protective relay sensitivity. This paper proposes a new system of protective relays for distribution lines using section switches with sensors to solve the problem. In addition, this paper shows the experimental results of the proposed system composed of Intelligent Electronic Devices based on IEC 61850. © 2015 The Institute of Electrical Engineers of Japan.


Amau T.,Chubu Electric Power Co. | Amau T.,Nagoya Institute of Technology | Saka Y.,Nagoya Institute of Technology | Nishiwaki K.,Nagoya Institute of Technology | And 5 more authors.
IEEJ Transactions on Power and Energy | Year: 2014

A reliability evaluation method of traditional Substation Automation System (SAS) has ever been well developed based on its physical configurations. However, appearance of Intelligent Electronic Devices (IED) based on IEC 61850 requires another type of evaluation with a functional viewpoint, because they integrate control and protection functions. This paper proposes a quantitative reliability evaluation method using an event tree method and unavailability of a module constituting an IED. It also states experimental results of the method applied to two types of protection systems that have a model of double bus bar and two transmission lines, and shows its effectiveness. © 2014 The Institute of Electrical Engineers of Japan.


Amau T.,Chubu Electric Power Co. | Amau T.,Nagoya Institute of Technology | Saka Y.,Nagoya Institute of Technology | Nishiwaki K.,Nagoya Institute of Technology | And 5 more authors.
IEEJ Transactions on Power and Energy | Year: 2014

Overseas utilities have been employing Substation Automation Systems (SAS) based on IEC 61850 in which Generic Object-Oriented Substation Event (GOOSE) provides a fast mechanism of transferring event data such as transfer trip. The GOOSE messages are required to be reliable enough to maintain electric supply reliability, even though off-the-shelf devices composing SAS have their fixed configurations about GOOSE. This paper proposes a method to improve reliability of GOOSE with redundant dispatchers and message retransmissions that can use the fixed configurations as is. It also describes experimental results using a test system dispatching GOOSE messages of transfer trip, and shows the advantage of our proposal. © 2014 The Institute of Electrical Engineers of Japan.

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