MEASURING SYSTEM FOR THE RECORDING OF THE CATENARY ZIG-ZAG PATTERN
B Artelius · 1975
A 15 kc/s current is fed to the contact wire by a high voltage capacitor connected to the pantograph on the measuring car. Two pairs of antennas on each side of the car symmetry line pick up the horizontal components of the magnetic field from the wire. The right and left hand side signals are separately transformed from the 16 kV level, filtered and rectified. The positive and negative sum of the signals and their difference signal are them fed to the servipotentiometer and the servo-amplifer of the recording system.