Power Monitoring Device
Power Monitoring Device
(OP)
Hi,
I am looking for a device that needs to monitor power flow on two 138kV transmission lines. The simple device specs are:
1. Calculate power from analog inputs (voltage and currents) and trigger based on a user defined threshold power with time delays.
2. Device should have logic function capabilities and be able to do summation of analog inputs.
I have researched and found that the devices that are capable of the specs but the draw back is that most of the devices offer only one set of voltage inputs and some decices do not have the capability to expand voltage inputs. I need atleast two. Moreover, some do not offer logic functions and summation functions.
The fault recorders offer these functions but I am looking into more of a protection class device like relays. I know that a device such as this can be built using transducers and timers a digital device is expected.
If anyone has applied or come across any devices, please let me know. I wanted second opinion from some of the experts out here. As I am new to this forum, pardon my mistakes. Thanks.
RedEngineer
I am looking for a device that needs to monitor power flow on two 138kV transmission lines. The simple device specs are:
1. Calculate power from analog inputs (voltage and currents) and trigger based on a user defined threshold power with time delays.
2. Device should have logic function capabilities and be able to do summation of analog inputs.
I have researched and found that the devices that are capable of the specs but the draw back is that most of the devices offer only one set of voltage inputs and some decices do not have the capability to expand voltage inputs. I need atleast two. Moreover, some do not offer logic functions and summation functions.
The fault recorders offer these functions but I am looking into more of a protection class device like relays. I know that a device such as this can be built using transducers and timers a digital device is expected.
If anyone has applied or come across any devices, please let me know. I wanted second opinion from some of the experts out here. As I am new to this forum, pardon my mistakes. Thanks.
RedEngineer






RE: Power Monitoring Device
And, of course, you can sum mA outputs by just connecting them in parallel. If you have a 0/4-20 mA output, then use a 250 ohms resistor to get the ten volts from 2x20 mA.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Power Monitoring Device
skogsgurra's ideas are good too - are you expected to develop a solution youself or find a ready-made device capable of doing everything? Even in the latter case you will probably need to develop some form of program.
----------------------------------
Sometimes I only open my mouth to swap feet...
RE: Power Monitoring Device
As this is the first time that we are implementing this, there are no exsisting relays that we have.I will look into relays capable of switchgear bay level control. I appreciate your help and ideas. Have a good day.
RedEngineer