×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

GE electromechanical relays - prone to dropping flag from vibration
2

GE electromechanical relays - prone to dropping flag from vibration

GE electromechanical relays - prone to dropping flag from vibration

(OP)
For Westinghouse electromechanical relays, the flag drops easily due to vibration.

Can the same thing happen for GE electromechanical relays?

=====================================
(2B)+(2B)'  ?

RE: GE electromechanical relays - prone to dropping flag from vibration

Yes.

RE: GE electromechanical relays - prone to dropping flag from vibration

(OP)
Thanks.  I am curious why you say that.

I looked at one and had a hard time understanding how that could happen. Unlike the Westinghouse where flag moves down, the GE flag must move up.... and the only thing that pushes it up is the contact arm.  Contact arm I believe is balanced in such a manner as to be not susceptible to vibration (to avoid sensitivity to spurious trip).  I was unable to cause flag the contact arm to move, much less flag to drop during my attempts at mechanical agitation with relay on the bench.

=====================================
(2B)+(2B)'  ?

RE: GE electromechanical relays - prone to dropping flag from vibration

(OP)
correction:

Quote (electricpete):

I was unable to cause flag the contact arm to move, much less flag to drop during my attempts at mechanical agitation with relay on the bench.
should've been:

Quote:

I was unable to cause the contact arm to move, much less flag to drop during my attempts at mechanical agitation with relay on the bench.

=====================================
(2B)+(2B)'  ?

RE: GE electromechanical relays - prone to dropping flag from vibration

Well, maybe not the flag itself per se, but the instantaneous element of an IAC will operate on vibration, and that certainly sets the flag.

RE: GE electromechanical relays - prone to dropping flag from vibration

Some of the relays the contacts moves sideways which have been known to cause trips. This is a common known problem with em relays.

RE: GE electromechanical relays - prone to dropping flag from vibration

Switchgear or MCC panel vibration can cause protection aux trip relay flags to unlatch & initiate a false trip.
I've experienced this on a large MV Fan Motor starter where the fan
was located adjacent to the MCC room.
During startup, as the fan accelerated through its critical speed, the panel vibrated in sympathy causing the relay to unlatch.
Problem was solved by mounting the relay housing on rubber pads.
It was a vintage GEC electromechanical motor protection relay.
   

RE: GE electromechanical relays - prone to dropping flag from vibration

Sort of brings a new meaning to "shake things up", and "in the dark".

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources