Neural Network has been one among few best choices for the detection of faults in electrical systems. HVDC transmission system has no doubt first choice for the long transmission of electricity all over the world. This paper presents a use of different artificial neural network for the fault detection & classification in HVDC transmission system. Here an attempt is made to cite the scholarly work done and available on renounced journals with excellent review on their work. The work is valuable and may be light house for beginners in the same field.