SU1647728A1 - Method for detecting "galloping" on overhead transmission lines and device for its realization - Google Patents

Abstract

The invention relates to electrical engineering and can be used to detect plastics of wires of overhead transmission lines with wires located in a horizontal plane. The goal is to simplify the way the wires are detected, and to simplify the device to detect the wires and transfer information about the place of origin of the wires to the control room. The method consists in comparing the amplitude values of the magnetic field measured under the wires of the monitored line at two specific points. The device contains two identical induction sensors, installed at two selected points below the line in each of the monitored spans. The signals from the sensors are fed to the inputs of detectors and integrators and converted into constant voltages proportional to the amplitudes of the sensor signals. At the receiving end of the linear path of the line, signals are decoded to accurately determine the occurrence of cable splices and spans in which the board is detected. . 2 with a. F-ly, 3 silt (L S

Description

The invention relates to electrical engineering and can be used to detect plly the wires of overhead transmission lines with wires located in a horizontal plane.

The purpose of the invention is to simplify the method of detecting a flat cable and simplify a device for detecting a flat cable and transferring information about the origin of the plastic line to a control center.

FIG. 1 shows the location of the induction sensors relative to the phase

power line wires, FIG. 2 is a block diagram of a device that implements the proposed method; in fig. 3 is a diagram of connecting the sets of the device to the linear path of the monitored transmission line in each span of this line.

Induction sensors 1 (Fig. 1) are installed mid-span in a plane perpendicular to the axis of the line, symmetrically with respect to the vertical passing through the middle phase.

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from the sensors to the high voltage wires and between the sensors themselves there must be at least half between the phase distance of the monitored line. Such an arrangement of induction sensors ensures their necessary safe distance from high-voltage wires, as well as the equality of their output signals in the absence of wire oscillations.

The device consists of two identical induction sensors 1, two identical detectors with integrators.2, a dividing unit 3, a two-threshold comparator 4, an electronic switch 5, a high-frequency generator b, a band-pass filter 7, a power supply 8 and an attachment equipment 9 (Fig. 2 ), and two inductive sensors 1 through detectors with integrators 2 are connected to the inputs of block 3 of the division operation. The output of the division operation unit is connected to one of the outputs of the two-threshold comparator 4, to the second input of which the reference voltage source Don is connected, the output of the two-threshold comparator is connected to the control input of the electronic switch 5, to the second input of which the high-frequency generator 6 is connected, the output of the electronic switch the band-pass filter 7 and the attachment equipment 9 are connected to the linear path of the transmission line, and the power supply circuits of the active units are connected to the power supply unit 8.

The device works as follows

The signals from the induction sensors 1 are fed to the inputs of the detectors and the integrators 2 and converted to constant voltages Ui and U2, proportional to the amplitudes of the signals from the induction sensors 1.

The constant voltages Ui and U2 are supplied to the inputs of block 3 of the division operation, the output of which takes the signal Uc Ui / U2. In the absence of wire oscillations Uc 1B, when the wires rotate B. The signal Uc is fed to one of the two inputs of the two-threshold comparator 4. To the second input of the two-threshold comparator 4, the reference signal Don is equal to 1 V.

With equal voltages, the signal at the input of the comparator 4 is missing. If Uc Uon and / Uc-Uon / ish / 2 (Uui is the width of the comparator discrimination window), a signal appears at the output of comparator 4. The value is chosen such that when swinging the wires (Uc-Uon / Uuj / 2), and when looping the wires (Uc-Uon / ish / 2). In this way,

the signal at the output of comparator 4 appears only when wires are being fused. This signal is applied to the control input of the electronic key 5. To the second input of the electronic

Key 5 is given a signal from high frequency generator 6. Subject to the presence of a signal at the control input of the electronic switch 5, the signal of the high-frequency generator 6 is fed through a band-pass filter 7 and

0 equipment 9 accession (AP) in the linear path of the overhead line. The frequency of the signal transmitted over the linear path is the code of the controlled span number. Power Required for Work

5 of the transmitter of the line span number (PNPL), comes from the power supply unit 8, which includes the overhead power take-off device (air transformer). The device is installed below each

0 span of the controlled line (Fig. 3), in which the flatness of the wires is possible. At the receiving end of the linear path of the overhead line (at the control room (DG), the decoding of signals

5 that allows you to accurately determine the fact of the occurrence of the plies of wires and the numbers of the spans in which the plate is detected. The method and device according to the invention allow to obtain accurate information about the occurrence of a flush of wires on power lines, to identify the need for ice melting devices on the respective power lines and to make rational use of these installations.

Claims (2)

1. A method for detecting flat conductors of overhead power lines, which consists in measuring the amplitude values of a magnetic field, which differs 0 so that, for the sake of simplicity, the amplitude values of the magnetic field measured under the wires of the test line at two points lying in the plane are compared. perpendicular to the axis of the line 5 is symmetrical with respect to the vertical passing through the middle phase, at least half the interphase distance from each other, and judging by the relative change in the measured values 0 about the amplitude of the mechanical oscillations of the wires. 2. Device for detecting flat wires of overhead power lines, containing induction sensors and 5 filter, characterized in that. In order to simplify the detection of flat wires, it additionally introduces two detectors with integrators, a dividing operation unit, a two-threshold comparator, an electronic switch, a high-frequency generator, equipment for connecting to the linear path of the transmission line and a power supply unit, and two inductive sensors through detectors the integrators are connected to the inputs of the division operation block, the output of the division operation block is connected to one of the inputs of the two-threshold comparator, to the second input of which the reference source is connected voltage, the output of the two-threshold comparator is connected to the control input of the electronic key, to the second input of which a high-frequency generator is connected, the output of the electronic key is intended to be connected via a band-pass filter and equipment connecting to the linear path of the transmission line. FIG. i FIG. 2 Ainear. path B / 1 B / 1 wires R  -about