RU2738411C1 - Method of monitoring technical condition of overhead power transmission lines by wire or ground wire rotation angle - Google Patents

Abstract

FIELD: electrical equipment.

SUBSTANCE: invention can be used in electrical engineering for determination of mechanical loads on wires/ground wires of overhead transmission lines, detection of overhead power transmission lines with icing and snow sticking on them, control of wires strands/ground wires defects. Method of monitoring technical condition of overhead power transmission lines consists in measurement of wire or ground wire rotation angle by means of wire/ground wire rotation angle determining module and further analysis of obtained data in personal computer. At that, monitoring device, including wire strand/ ground wire rotation angle determining module, rigidly installed on wire / ground wire of overhead line in close proximity to suspension point of wire/ground wire to support and transmits data on angle of rotation of wire/ground wire by transceiver of monitoring device to collection point and data processing, including a data collection and processing point transceiver and a personal computer, on which the technical state of the overhead line is determined based on the known geometric parameters of the overhead power transmission lines and the current rotation angle.

EFFECT: technical result is high accuracy of determining mechanical loads, information on the current state of overhead power transmission lines and simple installation and launch of monitoring systems implementing this method.

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Description

The invention relates to the field of electrical engineering and can be used to determine mechanical loads on wires / ground wires of overhead power lines, to detect spans of power lines with icing and snow adhesion to them, to monitor defects in wires / ground wires.

There is a known method for controlling the sag of a power line wire (patent for invention No. 2494511, 04/27/2012, IPC H02G 7/16), which includes placing a pendant temperature sensor on the wire, and a control device under the wire. With the help of the first and second ultrasonic transceivers, the measurement of the sag and the deflection of the wire horizontally across the power line is carried out by means of a control device together with a suspended temperature sensor. An ultrasonic pulse is emitted, an ultrasonic pulse is received on the ultrasonic transceivers, and the position of the wire in the plane is calculated from the propagation time of the ultrasonic pulse from the suspended temperature sensor to the first and second ultrasonic transceivers.

There is also known a method according to the author's certificate US 6229451 B1, IPC G01B21 / 00, 02.13.1998, a second measuring device is installed on the wire, and the first measuring device is placed in a certain space so that both devices are configured to transmit information about the position of the second device relative to the first ... The method allows you to restore the geometry of the wire in the span of the overhead line, and therefore determine the current mechanical loads on the wire.

The disadvantages of these methods are the complexity of their implementation (you need two measuring devices and data on the geometric parameters of both the span and the wire in it, and data on the location of the control / first measuring device), as well as the inaccuracy of restoring the geometry of the wire in the span of the overhead line due to displacement of the suspension points wire, which is not taken into account in these methods.

The closest to the proposed method is a method for monitoring the temperature and sag of overhead lines according to the application for invention US 20090138229 A1, IPC G01C9 / 00, G01K13 / 00, 16.12.2008, which consists in the fact that mechanical loads on the wire are taken into account using an inclinometric sensor (sensor for determining the angle of inclination of the wire) or a load cell. At the same time, the thermal expansion of the wire material due to the use of a temperature sensor is taken into account.

The disadvantage of this method is: if a load cell is installed - the need to adjust it for each span and the complexity of the installation (the load cell must be installed between the wire and its suspension point); in the case of installation of an inclinometric sensor - low sensitivity in the angle of inclination of the wire to a change in the force of its pulling, the displacement of the suspension points is not taken into account.

The objective of the claimed invention is to develop a method for monitoring the technical condition of overhead power lines by the angle of rotation of the wire or ground wire, which eliminates the disadvantages of analogs and prototype.

The technical result is to increase the accuracy of determining mechanical loads, informativeness about the current state of overhead lines and ease of installation and launch of monitoring systems that implement this method.

The technical result is achieved by the fact that in the method of monitoring the technical condition of overhead power lines by the angle of rotation of the wire or ground wire, which consists in measuring the angle of rotation of the wire or ground wire using the module for determining the angle of rotation of the wire / ground wire and further analysis of the data obtained in a personal computer, according to the present invention the control device is rigidly installed on the wire / ground wire of the overhead line in the immediate vicinity of the point of suspension of the wire / ground wire to the support, data is transmitted from it about the angle of rotation of the wire / ground wire through the transceiver of the control device to the data collection and processing point, which includes a transceiver of the collection and processing point data and a personal computer, on which, based on the previously known geometric parameters of the overhead line span and the current angle of rotation, determine the technical condition of the overhead line, while the control device contains an electronic circuit on which a microprocessor is installed, which receives information from the module for determining the angle of rotation of the wire / lightning protection cable, the transceiver of the monitoring device and the necessary set of diagnostic modules for determining additional parameters of the overhead line, and information about the measured data and the state of the monitoring device is also received from the microprocessor to the transceiver of the monitoring device, while from the electronic the control device circuit connects the power supply unit and the energy storage unit, from which the microprocessor is powered, the module for determining the angle of rotation of the wire / lightning protection cable, the transceiver of the monitoring device, the necessary set of diagnostic modules for determining additional parameters of the overhead line.

Thus, an almost direct transition from the angle of rotation to the pulling force of the wire / ground wire is provided, which makes it possible to detect defects in the wires of the wire / ground wire of overhead lines, determine the current mechanical loads on the wire with greater accuracy and minimize the effect of displacement of the suspension points in comparison with the case of using the inclinometric method for determining the tensile force of a wire / ground wire.

The essence of the invention is illustrated by drawings (Fig. 1 and Fig. 2). The drawing of Fig. 1 shows a span with a system for monitoring the technical condition of overhead power transmission lines installed on it by the angle of rotation of a wire or ground wire. Figure 2 shows a possible block diagram of a device that implements the proposed method for monitoring the technical condition of overhead power lines by the angle of rotation of a wire or ground wire.

FIG. 1 and 2, numbers indicate:

control device;

overhead line wire / lightning protection cable;

overhead line support;

control device transceiver;

data collection and processing point;

transceiver of the data collection and processing point;

Personal Computer;

electronic circuit of the control device;

microprocessor;

module for determining the angle of rotation of the wire / lightning protection cable;

the necessary set of diagnostic modules to determine additional parameters of the overhead line;

Power Supply;

energy storage.

The control device 1 is rigidly installed on the wire / ground wire 2 of the overhead line in the immediate vicinity of the suspension point of the wire / ground wire 2 to the support 3 and transmits data on the angle of rotation of the wire / ground wire 2 through the transceiver 4 of the control device to point 5 of data collection and processing, which includes a transceiver 6 of the data collection and processing point and a personal computer 7, on which, based on the previously known geometric parameters of the overhead line span and the current angle of rotation, the technical condition of the overhead line is determined.

The control device contains an electronic circuit 8, on which a microprocessor 9 is installed, which receives information from the module 10 for determining the angle of rotation of the wire / lightning protection cable, the transceiver 4 of the control device and the necessary set of diagnostic modules 11 to determine additional parameters of the overhead line, and from the microprocessor 9 to the transceiver 4 monitoring devices also receive information about the measured data and the state of monitoring device 1. Power supply 12 and energy storage device 13 are connected to the electronic circuit 8 of monitoring device 1, from which microprocessor 9 is powered, module 10 for determining the angle of rotation of the wire / lightning protection cable, transceiver 4 control device, the required set of diagnostic modules 11 to determine additional parameters of the overhead line.

The method is implemented as follows.

The control device 1 is rigidly installed on the wire / horizontal wire 2 of the overhead line and in the immediate vicinity of the suspension point of the wire / ground wire 2 and switches to the monitoring mode automatically or upon request from the personal computer 7. Moreover, the control devices can be installed on many overhead lines spans, independently building a sensor network , including all control devices 1 and working with point 5 of data collection and processing. This ensures the ease of installation and start-up of a monitoring system that implements this method.

The data measured using the module 10 for determining the angle of rotation of the wire / lightning protection cable 2 and the required set of diagnostic modules 11, through the transceivers 4 and 6, go to the point 5 of data collection and processing. In point 5 of collecting and processing data, information received from control devices 1 is processed on a personal computer 7 in specialized software.

The control devices 1 are powered directly from the diagnosed wire 2 through the power supply 12 or from the energy storage 13.

The required set of 11 diagnostic modules for determining additional parameters of overhead lines may include: wire temperature sensors (for assessing the thermal expansion of the wire / gorozotrost materials, as well as the current level of heating of the wire during overloads of overhead lines and during the process of melting ice-rime deposits); humidity sensor and ambient temperature sensor (to determine the point of desublimation), etc.

Acceleration sensors (mems accelerometers) or encoders with sufficient accuracy in determining the angle of rotation and low power consumption can act as sensitive elements of the module 10 for determining the angle of rotation of the wire or lightning protection cable.

Wires and ground wires 2 for overhead lines have a multi-wire structure and are a rope twisted from individual wires and have great flexibility. After twisting, each wire, except for the central one, is located along a helical line. Due to residual mechanical deformations after twisting the wire / ground wire 2, when the tensile forces change, it rotates around its axis. Thus, a change in the mechanical stress in the wire is expressed in a change in the angle of its rotation. Moreover, the sensitivity for the angle of inclination of the wire / ground wire to a change in the force of its tension is lower than the sensitivity for the angle of rotation of the wire / ground wire. In addition, the effect of the displacement of the suspension points of the wire / ground wire on the angle of its rotation is insignificant, in contrast to the angle of inclination of the wire / ground wire.

When the wires of the wire / ground wire 2 are broken, an irreversible change in the angle of its rotation is observed, by which it is possible to track the dynamics of the development of defects in the wires of the wire / ground wire.

Thus, by analyzing the method for monitoring the technical condition of overhead power transmission lines by the angle of rotation of a wire or ground wire, it is possible to increase the accuracy of determining mechanical loads, informativeness about the current state of overhead transmission lines and to achieve ease of installation and launch of monitoring systems that implement this method.

Claims (2)

1. A method for monitoring the technical condition of overhead power lines by the angle of rotation of a wire or ground wire, which consists in measuring the angle of rotation of a wire or ground wire using a module for determining the angle of rotation of a wire / ground wire and further analysis of the data obtained in a personal computer, characterized in that a control device that includes a module for determining the angle of rotation of the wire / ground wire, rigidly installed on the wire / ground wire of overhead lines in the immediate vicinity of the point of suspension of the wire / ground wire to the support and transmits data on the angle of rotation of the wire / ground wire through the transceiver of the control device to the data collection and processing point, which includes a transceiver a data collection and processing point and a personal computer, on which, based on the previously known geometric parameters of the overhead line span and the current angle of rotation, determine the technical condition of the overhead line. 2. A method for monitoring the technical condition of overhead lines by the angle of rotation of the wire or ground wire according to claim 1, characterized in that the control device contains an electronic circuit on which a microprocessor is installed, which receives information from the module for determining the angle of rotation of the wire / ground wire, the transceiver of the monitoring device , as well as from the ambient temperature sensor and the relative air humidity sensor to determine the point of desublimation, information from the wire temperature sensor to assess the thermal expansion of the wire / ground wire materials, as well as the current level of wire heating during overload overhead lines and during the process of melting ice and frost deposits , moreover, information about the measured data and the state of the control device is also received from the microprocessor to the transceiver of the control device, while the power supply and the energy storage are connected to the electronic circuit of the control device, from which the microprocessor is powered , the module for determining the angle of rotation of the wire / lightning protection cable, the transceiver of the control device, the ambient temperature sensor, the relative humidity sensor, the wire temperature sensor.

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