Question

If we add a series reactor( inductor ) for the
line, the distance protection response is

Answer 1

If we add series reactor ,the net reactance on the line will increase and fault current will reduce.speed of relay operation depends on fault current magnitude.As fault current reduces the response of the distance relay may be slower.For impedence,reactance relay,after adding series reactance impedence or reactance seen by the seen from the relay loacation uproar fault point will reduce and fault current will decrease as a result fault current may be less then relay pickup and it may not operate.so fault clearance will not happen .As a whole after adding series reactor the relay response may become slower.