| 摘要 |
A method for finding a fault on an electrical telecommunications transmission line, applies a pulse to one end of the telecommunications transmission line and a reflected signal is detected at the same end. In order to be able to find accurately even faults which occur at long range, line pulse responses (J1, J2, J3) are determined and stored for different line lengths of a line of the same type. When a dirac pulse is applied to the telecommunications transmission line, the correlation coefficient (r11, r12, r13) is in each case calculated from sections of the detected pulse response (JA) and from stored line pulse responses (I1, I2, I3), which in each case correspond to the sections in time. The reflection factor (R(t)) by multiplying the correlation factor (rJ1, rJ2, rJ3) by a computation variable (VxyJ1) which is formed by the quotient of a value from the respective section of the pulse response (JA) and of the line pulse response (J1, J2, J3). The conductance (Gab(t)) of the fault is found from the reflection factor (R(t)), using the characteristic impedance (Z).
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