The Internet of Things (IIoT) offers unprecedented possibilities for industries. Stay ahead with EcoStruxure™ Plant and Machine.Learn more
...with the EcoStruxure™ Facility Expert (formerly known as Facility Hero) app in hand! Discover how you can optimize your maintenance efforts today.Learn more
Access tailored services, 24/7 self-service and expert help. Anywhere, anytime, any project.Discover now
The story behind the Shedd Aquarium, a smart, sustainable facility that connects people to animals, with EcoStruxure™.Discover how
Welcome to the Schneider Electric Global Website×
Goals and Symptoms
When two transformers are connected in parallel, TLC parameters have to be adjusted accordingly since ION meters can only compensate for 1 PT. In this case, the system has to be simplified into 1 PT in terms of the variables that are used for TLC, i.e. %excitation current, Iron loss etc .
Causes and Fixes
Since the PTs are identical and connected in parallel, voltage on two meters will be equal. However, same assumption can not be made for the current since it will be dependent on the load. In the no-load situation, basic principles dictate that the current should be split into 2 equally, but load will not allow this assumption. Therefore, the following parameters can be calculated as:
Iron Loss: will be 2 times what one transformer would cause
%Excitation Current: will be 2 times what one transformer would require
%Impedance: Zt = (Z1*Z2)/(Z1 + Z2) where Z stands for impedance and t, 1 and 2 mean total, 1st and 2nd transformers respectively.
Copper Loss: As the current will not be split half, copper loss has to be calculated based on the current split. The current flow on each transformer has to be determined experimentally (or based on calculation with a fixed load). Since the Copper Loss is a function of I2, the ratio of Copper Loss for 2 PTs to 1 PT case can be found using the following formula:
Copper Loss for 2 PTs = [ (I1/I)2 + (I2/I)2 ] x Copper Loss for 1 PT where I, I1 and I2 indicate the total current flow and current flow on the 1st and 2nd transformers respectively.
Sign up for all the latest solutions, offers and best practices straight to your inbox.
We are excited that you have joined the group. You will receive your welcome email soon describing the program and what to expect in the upcoming weeks. Enjoy!