系統保護リレーシステムの信頼度の現状と今後の方向性

カテゴリ：技術報告

論文No：1619

グループ名：【B】電力・エネルギー部門

発行日：2026/10/6

タイトル(英語)：Current Status and Future Direction of Reliability of Power System Protection Relay Systems

著者名：系統保護リレーシステムの信頼度の現状と今後の方向性調査専門委員会

著者名(英語)： Investigating R&D Committee on Current Status and Future Direction of Reliability of Power System Protection Relay Systems

キーワード：系統保護リレーシステム, 信頼度, ディジタルリレー, 系統構成, ディジタル変電所, Protection relay systems, Reliability, Digital relays, Power system configuration, Digital substations

要約(日本語)：系統保護リレーシステムは，系統事故時の確実な事故除去と影響局限化により，電力供給信頼度を支える重要な設備である。本報告では，保護リレーシステムの機能，保護リレー装置の更新による信頼度維持，半導体・伝送・ソフトウェア等の関連技術の変遷を整理した。また，過去の大規模停電事故や第二世代ディジタルリレーの故障実績を踏まえ，信頼度向上策，装置構成，運用・保守の実態を調査した。さらに，国内外の系統構成や保護方式・仕様の相違が信頼度に与える影響を比較し，ディジタル変電所，IEC 61850，インバータ電源の普及等を見据えた将来の保護リレーシステムの信頼度確保と技術の方向性を示す。

要約(英語)：Protection relay systems are essential to power supply reliability because they detect faults, isolate faulted sections, and prevent the spread of disturbances. This technical report reviews the present status and future direction of their reliability. It first summarizes the functions and typical schemes of protection relay systems and the practices used to maintain reliability through renewal of protection relay equipment, including bulk renewal, retrofit, and partial renewal. It then describes the transition of supporting technologies, such as semiconductor devices, transmission systems, hardware design, software development, automatic supervision, remote operation and maintenance, and analyzer functions. Based on surveys of general transmission and distribution utilities, power producers, and manufacturers, the report organizes actual operating results, failure records of second-generation digital relays, renewal cycles, maintenance issues, and countermeasures for improving reliability. It also examines major blackout events and the evolution of reliability measures, including system stabilization, redundancy, automatic monitoring, and restoration support. In addition, the report compares Japanese and overseas approaches from the viewpoints of network configuration, protection schemes, device specifications, and reliability philosophy. Finally, it discusses future protection relay systems, including digital substations, IEC 61850-based architectures, broader use of IEDs, and the impact of inverter-based resources, and presents technical directions for maintaining and improving reliability in future power systems.

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