FIELD: switches voltage measuring.
SUBSTANCE: invention relates to measuring the parameters of high-voltage and low-voltage three-phase switches in operating electrical networks, in particular, the determination of the difference in timing of closing and opening of contacts, as well as the time intervals of the drive. In front of the switches at an isolation voltage distance, a group of three magnetic antennas in the form of inductance coils is placed, axes directed perpendicular to the terminals of three phases A, B, C of a three-phase switch, each in a U-shaped metal screen. The outputs of the magnetic antennas are connected to three inputs of a multichannel analog-to-digital converter, the output of which is connected to a computer. On the screen of the latter, visually, by the type of voltage oscillograms, the nature of the change in the strengths of the magnetic fields of each of the phases during the switching of the contacts is determined, according to which the time intervals between the values of the variable parameters of the processes of opening or closing the contacts of each phase are determined. Then, opposite the mechanical moving elements of the switch drive, a motion sensor is installed, the output of which is connected to an additional input of a multichannel analog-to-digital converter connected to a computer. On the computer screen, the movements of the moving elements of the drive are recorded, the time intervals between the initial and final values of the drive operation and the corresponding characteristic points during the switching of contacts are determined. With the combined consideration of the time intervals between the contacts and the time intervals of the drive, the full-time cycle is determined when switching three-phase switches with their subsequent comparison with the normalized values.
EFFECT: improving performance, increasing the accuracy of processing the results of measuring the timing of contacts, as well as the operation of the drive when switching three-phase switches.
1 cl, 6 dwg
