The invention relates to a cable type switching value temperature sensor with position information and a position measurement method of over-temperature points. The sensor comprises a
temperature sensitive switch
linear array, position
signal lines, grounding lines and a power line which are arranged side by side into a cable, wherein the
temperature sensitive switch
linear array is formed by arraying linear
temperature sensitive switches with
temperature sensing areas within the whole length range in a
linear array mode; the temperature sensitive switches are in an open circuit state under a normal condition, and once the temperature exceeds a set value, the temperature sensitive switches are quickly closed; two switch leads of each temperature sensitive switch are respectively spanned to a position
signal line and a
grounding line adjacent to the temperature sensitive switch; and when the temperature of a point of the sensor is overhigh, a position
signal line and a
grounding line of the corresponding position of the point are short out. During measurement, low-
voltage burst pulses are injected into the position
signal lines, and when the pulses are spread to the short out position along the position
signal lines, reflection occurs because of impedance mismatching so as to measure the time
delta t used from transmitting to returning, and the accurate position of the over-temperature point can be obtained according to a formula l=v
delta t / 2. The sensor has the advantages of obtain of specific position information of the over-temperature point, quite short sensitive length, longer monitoring area, and the like.