26-12-2012, 07:00 PM
INTELLIGENT POWER SHARING OF TRANSFORMERS WITH AUTO PROTECTION
INTELLIGENT POWER SHARING.doc (Size: 39 KB / Downloads: 53)
AIM:
The main aim of this project is to protect the transformer from failing or damage having applied more loads on it & share these over loads with another transformer.
PURPOSE:
The purpose of this project is to provide a secured environment for the transformers from over loads which are distributing power to certain regions. These transformers with over load are protected by sharing these over loads with another transformer.
DESCRIPTION:
Automatic load sharing of transformers is an integral part of the power control process, allowing smooth and immediate transfer of electrical current between multiple sources and the load. Here we are using two transformers TF1 (Main transformer) and TF2 (sharing transformer). The transfers switch senses when utility power is increases more than rating of transformer1, then starts up the transformer TF2 which acts as a sharing transformer. The transfer switch continues to monitor utility power, and when it is less than the rating of TF1 then sharing transformer will cutoff from load and switches the load from the Transformer TF2 back to the Main transformer TF1. Once the Transformer TF2 is disconnected, it goes through a cool-down routine and is automatically shut down.The objective of the present project “Automatic load sharing of Transformers” is to satisfy the above needs with an extent. The present system is designed around two transformers. One transformer (TF1) is used as the main supply and the other transformer (TF2) is used as sharing transformer. These two transformers are connected with the relay which is controlled by the embedded controller. The loads are connected to the main line (TF1) and as well as to the TF2 through relay.Initially TF1 is connected to the load, the loads run with this power. If the load on transformer 1 is increase beyond its rating then controller will find out that and it will connect the sharing transformer parallel to the main transformer. When we connect two transformers in parallel load will be shared by two transformers equally. And controller will continuously monitor the current flowing in the load and when the load current decreases below the TF1 rating then it will turn off the sharing transformer.
Here we are using CT for measuring the load current and the output of CT is given to ADC for converting analog output of CT into digital data. That ADC output is given to microcontroller for monitoring purpose. When current are increases certain limit then we are going to on the sharing transformer.