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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum ( )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Posted by: Paul Stokes ( )
Date posted: Wed Apr 4 2:28:22 US/Eastern 2001
Subject: Capacitor Failure Modes
But wait there's more....! Just to add some background info to the question 4 previous to this one. Two capacitors have been stored in the same general location. One energised and one not. They have both expanded (the energised one more than the other). Testing reveals correct capacitance and insulation resistance. The main information required is 1 What is likely to be causing this expansion of the capacitor walls. 2 How can the extent of any degradation be tested for. 3 How to determine when they need to be put out of service. Thanks again, Paul Stokes


Subject: Capacitor Failure Modes
Reply Posted by: Robert Arno ( )
Organization: Reliability Analysis Center
Date Posted: Thu Apr 19 8:45:06 US/Eastern 2001
Based on the information you have provided the condition could be as a result of corrosion of the internal material independent of operation. Capacitors usually fail in a condition that will effect the quality of power, filtering capabilities, not causing a system fault. This is a guess and is based on the limited information provided. Additional information would help me provide more details, manufacture, type of capacitor bank, environmental conditions, age, etc.

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