FIELD: engineering of electric power supply of railroads.
SUBSTANCE: proposed device is related to ensuring the normal functioning of the railroad high-voltage lines of longitudinal electric power supply with insulated neutral. A current transducers is switched into one from undamaged phases, closed with the damaged phase on the near end of line. The switch is located on the far end of line and has possibility closing and breaking of the undamaged and damaged phases with the current transducer. The measuring part is carried out with successively switched arithmetical device, functional corrector and indicator. The device has also a stabilized constant-current source, intended for supplying two measuring circuits by the current of equal value. The constant-current source is switched between the ground and phases, closed on the near end of line. This measuring part has also a control device and voltmeter with parallel connection to the stabilized constant-current source. The control device ensures possibility to control the voltmeter operation for realization of the peaking-difference function of this voltmeter in the modes with broken and closed switch. Besides the control device has possibility to control the arithmetical device, obtaining the information from the voltmeter on fulfillment the subtraction function of voltage, obtained in the second mode, from the first mode voltage, loaded preliminary into memory. The arithmetic device has possibility to realize the division of obtained voltage difference by the current, measured with current transducer, and to transmit the division result into the functional corrector. The last has possibility to take into account the line parameters and to convert the division result into a signal, convenient for readout on the indicator of information about the distance from substation up to the place of phase ground.
EFFECT: high functional possibilities; in particular, possibility to determine the places of phase ground in the low power lines at small tested currents and at large contact resistance in a place of ground.
CL, 1 dwg
