Collected-current monitoring device

A collected-current monitoring device comprising:

• a first current sensor configured to detect a current value I1 of collected current flowing through a first current collector;
• a second current sensor configured to detect a current value I2 of collected current flowing through a second current collector;
• a first RMS-calculation unit configured to calculate a root mean square (RMS) 1 of the current value I1 at a window width W;
• a second RMS-calculation unit configured to calculate a root mean square (RMS) 2 of the current value I2 at the window width W;
• a determining unit configured to determine whether a combination of the root mean square (RMS) 1 and the root mean square (RMS) 2 satisfies an abnormality condition;
• an abnormality-signal output unit configured to output an abnormality signal when the determining unit determines that the abnormality condition is satisfied;
• a monitor unit configured to display an occurrence of malfunction based on the abnormality signal;
• a control unit configured to control speed or acceleration of the railway vehicle based on the abnormality signal;
• an information-obtaining unit configured to obtain railway vehicle information including a position and a speed of a railway vehicle that comprises the first current collector and the second current collector;
• and
• a setting unit configured to set a set-parameter that includes at least one of the window width W or the abnormality condition depending on the position and the speed of the railway vehicle shown in the railway vehicle information.

A method comprising:

• obtaining a current value I1 of collected current flowing through a first current collector, and a current value I2 of collected current flowing through a second current collector;
• calculating a root mean square (RMS) 1 of the current value I1 at a window width W;
• calculating a root mean square (RMS) 2 of the current value I2 at the window width W;
• determining whether a combination of the root mean square (RMS) 1 and the root mean square (RMS) 2 satisfies an abnormality condition;
• outputting an abnormality signal when it is determined that the abnormality condition is satisfied;
• obtaining railway vehicle information including at least one of a position or a speed of a railway vehicle that comprises the first current collector and the second current collector;
• and
• setting a set-parameter that includes at least one of the window width W or the abnormality condition depending on the railway vehicle information.