×
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

SIEMENS relay has 3 "ANSI 50" functions...(?)

SIEMENS relay has 3 "ANSI 50" functions...(?)

SIEMENS relay has 3 "ANSI 50" functions...(?)

(OP)
Hi friends,

I need to understand the SIEMENS relay 7SJ640, it has 3 "ANSI 50" functions called 50-1, 50-2 and 50-3.

Please, how do these functions work together ? Let's say for example that I want the relay to trip the breaker instantaneously if the current reach 1200 A, how should these 3 functions be set ?

Thanks a lot,

Mongao

RE: SIEMENS relay has 3 "ANSI 50" functions...(?)

I know nothing about Siemens relays, but the relays I use have multiple 50 settings. Each can be assigned a different time setting for definite time tripping; any can be used in other functions; SOTF may have on 50 element that isn't used for anything else, forward and reverse elements can be set a different pickup levels. The uses of three levels are limited only by your imagination.

RE: SIEMENS relay has 3 "ANSI 50" functions...(?)

User configurable. You might use 50-1 at a lower setting that allows reclosing, 50-2 at a higher setting that doesn't, and 50-3 enabled by a relay input connected to a toggle that puts it into a "maintenance mode" lowering arc incident energy exposure.

For your simple example, I would pick one and disable the other two to keep things simple. You could set all three the same for redundancy, but it would be a rare failure that would affect only one element in the same relay.

RE: SIEMENS relay has 3 "ANSI 50" functions...(?)

(OP)
Thanks for replying, it's much appreciated !

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