The Insulation Check and Estimation of the Rest of motor's Life for Paper and Pulp Equipment

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Other Title
  • 紙パ設備における電動機の絶縁診断及び余寿命推定
  • カミパ セツビ ニ オケル デンドウキ ノ ゼツエン シンダン オヨビ ヨ ジュミョウ スイテイ

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Abstract

Electric equipment is a pillar of today's industrial operations, and maintaining its stability is one of our important roles.In the past, it was important how quickly we repair the equipment after an accident occurs.However, these days we emphasize how we can avoid accidents.<BR>To avoid a sudden accident.the equipment must be properly checked, therefore, the ability to foresee and prevent accidents is a necessity.<BR>Initially, motors are designed (made) to have a long life span and durability.As well, we can keep a motor operation safety by replacing expendable items such as bearings and luburicating oil or by cleaning it.<BR>However, the insulation capacity of a motor will decline over time because dust in the air sticks to coil, which prevents it from cooling properly and because some of the dust absorbs humidity. In addition, If something prevents the coil from cooling, it will heat up.Generally, it is believed that a coil's life span will be reduced by half for every lot increase in temperature.<BR>As stated above, the insulation capacity of electric motors declines with age, much like the human body.<BR>As for the paper and pulp equipment, checking the rest of motor's life span and resuscitating of its insulation are performed in recent years along with the increase of the demand.<BR>In this article, I will report about how to check the insulation and its known-how as a motor maker, and about an estimation of insulation's brake down voltage, which I refer to a data from repairing and replacing windding coil. I will also inform about a method of the estimation of the rest of life span.Then I will Introduce the technology (the method to prolong life span of winds by vacuum pressurized impregnation by using epoxy resin) to revive the insulation by not changing the winding coil.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 55 (2), 193-198,025, 2001

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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