![sensor_SPS](https://i0.wp.com/www.treetech.com.br/wp-content/uploads/2014/12/MG_9973.jpg?fit=300%2C300&ssl=1)
Commands the parallelism between two or more power transformers (keeping the philosophy Master-Slave) and indicates the switching position of the OLTC. Maintains the same position in all the transformers and avoid a current flow between the windings in parallel.