×
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

Controller for Power Substation

Controller for Power Substation

Controller for Power Substation

(OP)
Hello everyone,

I am looking for a controller (PLC-like) for a power substation. It must have:
1.- analog input for three phase current (5A) and voltaje (120V), coming from substation current and voltaje transformers, as most protective relaying equipment has.
2.- 4-20 mA analog input (PT100 temperature reading).
3.- discrete inputs and outputs.
4.- Very important: It should perform mathematical operations such as +,*,/ and other like sin, cos, square root, etc, in order to implement a control algorithm.
I have found the C90+ controller (GE), but it seeems it does not have a 4-20 mA input yet.

Could you please recommend another -equivalent- device with the base characteristics mentioned above?

Thanks in advance!

 

RE: Controller for Power Substation

http://www.selinc.com/SEL-2411/

If a device can accept analog inputs, the specific signal level should not be an issue.  There are inexpensive signal converters that can convert 4-20 mA to whatever level is needed.

 

David Castor
www.cvoes.com

RE: Controller for Power Substation

Try Siemens S7-300 PLC. Siemens offers additional modules to install on the S7-300 CPU for analog  signal for any requirements.  

RE: Controller for Power Substation

Nothing really special about the requirments that your asking for about a PLC.

Manufacturers
Siemens
Allen Bradley
Scheinder Electric
Omron
Mitsubishi

even the low priced plcs do what your asking
 

RE: Controller for Power Substation

There are other factors that may play a part too, depending on the size of your 'power substation' including communications protocols for remote monitoring, and protection functions that you may require.

To me, its a lot easier to get the data out via a comms interface than it is trying to play around with discrete inputs to get the same result.  

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