Controller for Power Substation

[mmoisan]

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!

 

[dpc]

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

http://www.cvoes.com

 

[krsh]

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

 

[controlsdude]

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

 

[FreddyNurk]

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.