Application of artificial neural networks in adaptive interlocking systems

Interlocks have been in use ever since protective relaying schemes were implemented for power devices like generators, transformers, transmission lines, etc. Although the science of protective relaying has undergone marked changes and improvements, the interlocking philosophy has not changed much. Recently with the availability of programmable logic controllers (PLCs), interlocking schemes have been implemented by means of these devices with basic philosophy of logic remaining the same. This paper suggests the implementation of interlocking schemes with artificial neural networks employing threshold logic unit (TLU) elements. It is demonstrated that while the basic hardware required is same as that of any common PLC, the suggested system will have added flexibility, adaptability to various switchyard modifications, electrical topology changes and equipment/switchyard conditions as well as network complexity.