METHOD OF REVEALING LOW-RESISTANCE CONTACT SYSTEM CONCRETE POLES TURNED ON TO GROUP GROUND CONNECTION Russian patent published in 2005 - IPC

FIELD: ancillary facilities of railroad transportation systems driven to motion by direct current.

SUBSTANCE: current source is connected between group connection and rail and the current is estimated, which flows along fittings of each pole connected with group connection cable. DC alternating pulses and high frequency alternating current are sent to the cable by current source. Current that passes through fittings of pole is evaluated by two mutually supplemental methods: evaluative induction method conducted by means of narrow-band receiver and by measuring potential gradient close to pole when receiving DC pulses. As a current source, the generator is used which has frequency to be several 10 times higher than basic harmonic frequency of pulsation of rectified voltage in contact circuit and several times higher than minimal natural resonant frequency of "group ground connection cable - poles - ground" circuit. As a high frequency receiver, the narrow-band receiver that eliminates receiving of induced current of any other frequency. When evaluating value of direct current passing through fittings of pole, differences in readings of receiving device is taken into account at turning direct current on and its periodical switching off.

EFFECT: improved efficiency of operation.

4 cl, 1 dwg