Forum: Reliability & Maintainability Questions and Answers

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Posted by: Paul Stokes (Pstokes@skm.com.au )
Date posted: Wed Apr 4 2:28:22 US/Eastern 2001
Subject: Capacitor Failure Modes
Message:
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

Replies:
Capacitor Failure Modes
Robert Arno Thu Apr 19 8:45:06 US/Eastern 2001

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Posted by: David Vermeis (dvvermeis@lambtech.com )
Organization:Lamb Assembly & Test
Date posted: Tue Apr 3 17:08:53 US/Eastern 2001
Subject: Reliability and Failure mode cd's
Message:
I am interested in ordering the Electric reliability, nonelectric reliability and failure mode distribution cd's. However, I noticed that the publication dates are 1997 and 1998. I hate to order the cd's only to have a new release come out shortley thereafter. Can you tell me is there a new release comming out shortly? And how often are they updated? Thanks in advance.

Replies:
Data Product Updates
David Dylis Wed Apr 4 11:07:27 US/Eastern 2001

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Posted by:Lawrence Lacuesta (Lawrence.Lacuesta@tas.alcatel.ca )
Date posted: Tue Apr 3 17:00:43 US/Eastern 2001
Subject: Relay Failures
Message:
hi!
The failed relay is solder-mount on a standard 3U PCB, pluggable, ground mobile environment, operating at least 150,000 cycles/year, current rating is 10% of rated load at 1A (lamp). Relay is rated 100,000 cycles @ rated load. Failure Analysis result: The relay contact shorted to the coils was caused by broken moving contact spring. The normally closed contacts remain open when the voltage was removed from the coils (de-energized) was caused by damage/fractured of the over-travel spring and broken weld joint of the armature hinge pivot, which prevented the armature from assuming the drop out position. Per manufacturer, the weakest point on the relay is the spring that is sitting directly on top of the contact pins inside the relay enclosure. Is the above result caused by shock and vibration and not over cycling? Thanks in advance!

Replies:
Reliability Analysis Center
Patrick Hetherington Wed Apr 4 9:19:49 US/Eastern 2001

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Posted by: Johnson Wood
Date posted: Tue Apr 3 3:12:21 US/Eastern 2001
Subject: Failure rate prediction
Message:
There are a great deal of products operating in the field entironment. Recently, some failures were occured and caused some losses for our company. The main cause is some types of component failed, such as hard disks, memories, power modules. Now, the company leaders wonder:
1. How long will the remainder products that not failed to this day last? 2. and if there will be a moment that most products will fail? By these, we can make some preparatives before they fail, such as preventive replacement. Any advices will be welcome.

Replies:
Failure Rate Prediction
Patrick Hetherington Tue Apr 3 6:30:18 US/Eastern 2001

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Posted by: Paul Stokes (PStokes@skm.com.au )
Date posted: Mon Apr 2 23:56:45 US/Eastern 2001
Subject: Capacitor Failure Modes
Message:
Hello,
I was searching for information on the common failure modes of 33kV capacitor banks without much luck. Any expertise or knowledge in this field would be most helpful. Thanks, Paul Stokes

Replies:
Capacitor Failure Modes
Robert Arno Mon Jun 4 12:55:52 US/Eastern 2001

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