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電動機絶縁診断技術の開発

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川崎製鉄技報

KAWASAKI STEEL GIHO Vol. 22(1990) No.2

電動機絶縁診断技術の開発

Development of Insulation Diagnosis Technique for Electric Rotating Machine

田 部 井 邦 夫(Kunio Tabei) 山本 博正(Hiromasa Yamamoto) 有光 博(Hiroshi Arimitsu) 要旨 : 直流機や特高・高圧交流機の寿命は20~30 年といわれており,現在使用中のものの中にも 寿命域に近づいているものが相当量含まれている。当社では設備の安定操業を図るために, 1980 年より電動機の診断技術の開発を進めてきた。特高・高圧交流機に関しては,(1)直流 や交流の高電圧を印可して吸湿状況やボイド劣化を診断する精密絶縁診断技術,(2)コロナ 測定による絶縁劣化診断技術,(3)絶縁診断エキスパートシステム,を開発した。また直流 機に関しては,(1)オンライン絶縁監視技術,(2)吸湿度評価技術,(3)電機子巻線断線診断技 術,(4)直流機診断監視システム,(5)寿命予測技術,を開発,確立した。これにより定量的, 効果的な電動機の保全が可能となった。 Synopsis :

More than 25 years have passed since major facilities came into operation at Chiba works. Most of the electrical equipment has gradually deteriorated with the lapse of time, and above all, insulation performance of DC and high voltage AC motors has fallen down remarkably. Under such conditions, it has become a pressing need to establish the insulation diagnosis technique for electrical rotating machines. The authors started to develop these techniques in 1980, and have obtained some good results. New diagnostic methods and instruments developed by them are as follows. For high voltage AC motors, (1)precise diagnosis technique, (2)corona discharge measuring apparatus to find out the deteriorated part of insulation, and (3)expert system for insulation diagnosis; and for DC motors, (1)live wire insulation monitor, (2)armature broken-wire detecter, (3)con-dition monitoring system, (4)evaluation method of hygroscopic performance, and (5)lifetime prediction.

(c)JFE Steel Corporation, 2003

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