| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a tension monitoring device for reducing the capacity of a power supply by reducing power consumption. SOLUTION: A tension sensor part 2 consisting of a magnetostriction type distortion sensor is provided between a fixed part and an overhead electric wire for supplying current to a streetcar, an analog signal proportional to the tension applied to the overhead electric wire from the output of the tension sensor part 2 is subjected to operation processing, an AC error caused by a leak current that flows to the tension sensor part 2 due to the approach of the above streetcar included in the analog signal is detected, and the above error is eliminated, thus measuring the tension of the overhead electric wire. It is detected that the above streetcar is within the overhead electric wire section in specific length units from the above error, tension is continuously measured, only a slight time zone is measured by the setting of a timer 53 when the streetcar is not within the overhead electric zone in specific length units, and continuous measurement is paused for the remaining time zone.</p> |
