43 results about "Conductor gallop" patented technology

The invention discloses a transmission line iced conductor galloping aerodynamic parameter monitoring device comprising an integrated online transmission line monitoring unit and an online conductor galloping monitoring unit which is arranged on an iced conductor. The integrated online transmission line monitoring unit is connected with the online conductor galloping monitoring unit through 3G signals, and is connected with a monitoring center background system through a 3G network. The invention further discloses a method for monitoring the aerodynamic parameters of iced conductor galloping by using the transmission line iced conductor galloping aerodynamic parameter monitoring device. By adopting the transmission line iced conductor galloping aerodynamic parameter monitoring device and the monitoring method of the invention, the icing thickness of an iced conductor of a transmission line and the real-time aerodynamic parameters during galloping of the iced conductor can be acquired accurately.

The invention discloses a method for monitoring conductor galloping based on spacer recognition. The monitoring method takes a digital image intercepted in a video stream of a power transmission line as a research object, and the image is pre-processed through an image graying method, a smooth de-noising method and the like. The pre-processed image is subjected to threshold segmentation, edge detection, and outline tracking and compensation; the outline of a conductor spacer is extracted; and a galloping torsion angle is calculated according to the outline matching difference shape of a spacer template before and after galloping. When the galloping torsion angle is abnormal, early warning information can be sent to a safety inspector in time, so that a line operation condition is concerned and corresponding processing measures are adopted. According to the method for monitoring the conductor galloping based on the spacer identification, an accurate mathematic model does not need to be established, and the detection and early warning of the galloping torsion angle can be rapidly and automatically realized.

The invention relates to an active anti-galloping device of an overhead power transmission line, and belongs to the technical field of power transmission line safety protection. According to the active anti-galloping device of the overhead power transmission line, a rack is adopted for transmitting rotation motions of a driving gear, and the design idea that one rotation motion is finally converted into two symmetrical rotation motions is realized. When galloping of the overhead power transmission line is restrained, the swing amplitude of pendulum bobs can be adjusted by combining the conductor galloping amplitude which is monitored in real time. After galloping acceleration signals caused by different wind speeds are monitored, conductor galloping acceleration signals are transmitted to a signal processing system through a conductor, the signals are processed by the signal processing system, and the processed signals are output to an anti-galloping control device through a conductor. The anti-galloping control device conducts recognition on the signals and outputs control instructions, the control instructions are transmitted into a stepping motor through a conductor and the stepping motor rotates by corresponding angles according to the control instructions so as to adjust the amplitude of the motions of the pendulum bobs.

The invention discloses a measurement method of power transmission line iced conductor galloping aerodynamic parameters. The measurement method includes the following steps that: the galloping lift coefficient, galloping drag coefficient and galloping torque coefficient of a power transmission line iced conductor are acquired; 2) a plurality of cameras are utilized to perform multi-angle image capture on the power transmission line iced conductor, and the icing outline of the power transmission line iced conductor is obtained through a "three-tower two-gear" equivalent icing thickness mechanical calculation model, and an icing shape is obtained through fitting, and therefore, an actual icing shape of the power transmission line iced conductor can be obtained; 3) an inertial navigation sensor is used in combination with power transmission line conductor galloping trajectory reduction technology, so that the real-time wind attack angle of the power transmission line iced conductor can be obtained; 4) all the obtained data are utilized to draw aerodynamic parameter curves under the actual icing shape and the wind attack angle, and as a result the measurement of the galloping aerodynamic parameters of the power transmission line iced conductor can be completed. With the measurement method of the invention adopted, the aerodynamic parameters in the galloping of the power transmission line iced conductor can be measured actually.

The invention provides a multi-element conductor galloping early warning method based on deep learning and a related device. The method comprises the following steps: collecting related information ofa target coordinate point, wherein the related information of the target coordinate point comprises latitude and longitude, altitude, temperature, relative humidity and wind speed of the target coordinate point, sounding temperature in sounding data, and a difference value between the sounding temperature and dew point temperature; inputting the collected related information of the target coordinate points as input sample elements of a pre-trained model into the model; and obtaining a galloping early warning result which is output by the model and is used for representing whether the target coordinate point is a galloping point. According to the method, the influence of ground meteorological factors, high-altitude meteorological factors, terrains and geographic positions on power transmission line galloping is comprehensively considered, the universality and accuracy of wire icing galloping prediction are improved, and effective early warning information can be provided for power transmission line galloping under various terrain conditions of various regions in China.

The invention discloses an iced conductor galloping ANSYS numerical simulation method based on a beam element, comprising the following steps: establishing a conductor static model; the static model of conductor being extended to the transmission line, and the static model of transmission line being obtained; establishing a split spacer bar model; solving the lifting force, damping force and torque of any conductor; loading the lifting force, damping force and torque wire model to obtain the wire force model; solving a transformation matrix to obtain the motion displacement value and the velocity value of all nodes of the local coordinate unit of the traverse; transforming the overall coordinate system of the traverse displacement into a local element coordinate system; the nodal forces attwo nodes of each local element of a single wire being solved, and the overall force of the wire being obtained by using the transformation matrix. The ice galloping model of conductor is obtained bytransforming the whole force of conductor into the whole coordinate system. Then the ice galloping model of transmission line is obtained. The utility model has the advantages that the anti-gallopingeffect of the split spacer rod is tested by changing the installation mode of the split spacer rod so as to improve the reliability of the transmission line.

The invention discloses a transmission line galloping monitoring method based on OPGW ground wire induced current. It is assumed that the galloping frequency, galloping amplitude and galloping position of a transmission line conductor need to be deduced by measuring the induced current on an OPGW ground wire of an N-th base tower of a transmission line. The transmission line galloping monitoring method comprises the following steps that a current transformer is installed on the OPGW ground wire of the N-th base tower, and the output end of the current transformer is connected with wave recorders; the wave recorders are provided with a trigger threshold value, and the wave recorders do not record waveforms when the line works normally; and when the conductor gallops, the OPGW ground wire iscoupled with induced overcurrent, the wave recorders are triggered and record the current waveforms; according to signal analysis and an electromagnetic field theory, the coupling coefficient betweenthe OPGW ground wire and conductor is calculated, so that the galloping frequency and galloping amplitude of the conductor are calculated; and by analyzing the waveforms recorded by the wave recorders installed on different towers, the galloping position is located.

The invention relates to a conductor galloping instability analysis method. The method comprises the steps of (1) determining pneumatic parameters and a pneumatic load according to an eccentric icing form of a conductor; (2) building a conductor galloping oscillation starting wind speed calculation model for calculating a conductor galloping oscillation starting wind speed according to the pneumatic parameters and an oscillator model; and (3) calculating a conductor galloping amplitude characteristic according to the pneumatic parameters and the conductor galloping oscillation starting wind speed calculation model. The technical scheme has a very important effect for improving the accuracy and effectiveness of anti-galloping design of a power transmission line.

The invention relates to a damping connection type multi-split conductor current-disturbing anti-galloping device. The device comprises a framework and wire clamps, wherein the wire clamps are arranged on the framework, perpendicular to the axial direction of the framework, and arranged outwardly; an inner framework and damping apparatuses are arranged on the same plane of the framework; fixed columns are axially fixed on the framework; and current-disturbing wires wind the side faces of the fixed columns. The current-disturbing anti-galloping device is applicable to prevention of multi-split power transmission line galloping; common multi-split spacing rods are designed and improved, so that the flow field characteristics among the multi-split conductors are effectively changed, the conductor galloping energy can be absorbed, the galloping probability of the power transmission line is lowered, and security and reliability of the line are improved.

The invention discloses an overhead conductor galloping testing device and an overhead conductor galloping testing method on the basis of the gear-end displacement excitation and belongs to the technical field of galloping prevention of an overhead conductor. The testing device comprises conductor hanging devices, a transverse driving device, the overhead conductor and insulator strings. The conductor hanging devices are fixed on the ground. Both ends of the overhead conductor are respectively connected with two conductors hanging devices through the insulator strings. The transverse driving device is connected with the insulator strings. The testing method is implemented by steps of determining a measured point, loading, recording, analyzing and the like. According to the invention, the transverse driving device is matched with the overhead conductor to simulate the galloping condition of the overhead conductor in practice when the overhead conductor is subjected to gear-end displacement excitation along the direction of the overhead conductor; the testing device and the testing method are used for researching the galloping rules of the overhead conductor under the conditions of different spans, different excitation frequencies and different excitation amplitude; the defect of conventionally only carrying out galloping excitation on the conductor in the direction vertical to the overhead conductor is overcome; testers can more comprehensively know the galloping mechanism of the overhead conductor so as to give the galloping prevention measures.

The invention discloses a conductor galloping monitoring method based on concentric circle detection. The method comprises the steps: fixing a concentric circle-shaped object on a power transmission conductor, enabling a camera to collect a video image containing the concentric circle-shaped object in real time, and calculating the central coordinates of the concentric circle-shaped object throughthe recognition of concentric circles in the image; the conductor galloping track can be obtained by recording center coordinate changes, and the maximum amplitude of conductor galloping and the mainfrequency of galloping are further calculated, so that the effect of dynamically monitoring the conductor galloping condition in real time is achieved.

The invention relates to a power transmission conductor galloping amplitude measurement method. According to the power transmission conductor galloping amplitude measurement method, a measurement device composed of a small-sized remote control unmanned aerial vehicle (1) and a small-sized high-definition image pickup instrument (2) which has cross scale marks and is installed at the bottom of the small-sized remote control unmanned aerial vehicle (1) is utilized to realize multi-azimuth and multi-angle observation of the galloping form of a power transmission conductor (3). With the power transmission line galloping amplitude measurement method adopted, an optimal position can be selected, so that the galloping amplitude of the power transmission conductor can be measured at the position, and a measurement angle and the conductor are located at the same horizontal plane; the images of the highest point and the lowest point of the galloping of the conductor can be obtained accurately; a conversion method is simpler; the defects of limited measurement angles and complex conversions methods in existing methods can be eliminated; measurement results can be more accurate and effective; the measurement results can provide data support for follow-up galloping prevention and control work; and safe and stable operation of a power grid can be ensured.

The invention discloses an active anti-galloping executing mechanism of an overhead power transmission line, and belongs to the technical field of power transmission line safety protection. The active anti-galloping executing mechanism of the overhead power transmission line comprises a stepping motor, a driving gear, a rack, a first driven gear, a second driven gear, a first transmission shaft, a second transmission shaft, a first pendulum bob and a second pendulum bob. Rotation motions of the driving gear are transmitted by the adoption of the rack, the design idea that one rotation motion is finally converted into two symmetrical rotation motions is realized, the conductor galloping conditions can be monitored in real time according to conductor acceleration signals when galloping of the overhead power transmission line is restrained, and the motion amplitude of the pendulum bobs can be adjusted according to the conductor galloping amplitude. The cylindrical pendulum bobs are adopted, so that in the working process, resistance is large, and therefore conductor galloping is more effectively prevented.

The invention discloses a conductor galloping suppression system of a power transmission line. The conductor galloping suppression system comprises a power transmission line conductor, a machine caseand a horizontal suppression block; the horizontal suppression block is in mechanical connection with the machine case through an L-shaped connecting arm a; a perpendicular suppression block is in mechanical connection with the machine case through an L-shaped connecting arm b; a rectangular through hole a with a horizontal length of 2d and a perpendicular length of d is formed in the middle of the horizontal suppression block; a rectangular through hole b with a horizontal length of d and a perpendicular length of 2d is formed in the middle of the perpendicular suppression block, wherein d isthe diameter of the power transmission line conductor; the power transmission line conductor passes through the rectangular through hole a and the rectangular through hole b; a horizontal suppressiontransmission apparatus is arranged between the horizontal suppression block and the machine case; and a perpendicular suppression transmission apparatus is arranged between the perpendicular suppression block and the machine case. The conductor galloping suppression system controls the position of the power transmission line conductor to be stable for preventing galloping; and in addition, by virtue of a monitoring system of the apparatus, the conductor state can be monitored in real time.

The invention discloses a simulation test method for galloping of an iced conductor. According to the method, a four-degree-of-freedom multi-gear conductor-insulator system mechanical model is established by utilizing self-programming software. The method comprises steps of determining the initial tension of the wire through a stress state equation according to the typical meteorological conditioncombination, and determining the displacement of the conductor in an initial state by applying a catenary model, utilizing the aerodynamic characteristics of the iced conductor to obtain the stress condition of the conductor under the action of wind power, obtaining a conductor kinetic equation, and then adopting an explicit direct integral algorithm based on center difference to solve the displacement and stress condition of each node of the conductor at the discrete moment. According to the method, through simulation calculation, reliable results can be provided for solving the problems ofdisplacement and tension calculation at discrete moments when the iced conductor gallops under different working conditions. Therefore, scheme reference is provided for field tests, suggestions are provided for power transmission line design, data support is provided for actual line operation, and early warning is made for possible severe working conditions.

The invention provides a triggering type anti-galloping device and a wire galloping monitoring device and method. The triggering type anti-galloping device comprises a pendulum bob shell (6), a triggering type sensor (5) arranged in the pendulum bob shell (6), a first spring (7) and a second spring (8). The triggering type sensor (5) is connected with the inner wall of the pendulum bob shell (6) through the first spring (7) and the second spring (8). The triggering type sensor (5) is used to collect the position coding information of the wire. The linear rigidity and the cubic rigidity of thependulum bob are determined on the basis of the nonlinear energy groove theory, the anti-galloping effect limitation is small, the anti-galloping effect is good, and conductor galloping monitoring canbe achieved. The galloping characteristic of the conductor length body is effectively changed, and the easy galloping during low wind speed and thin icing is avoided; according to the conductor galloping monitoring device provided by the invention, the conductor galloping condition is monitored through interaction between the plurality of triggering type anti-galloping devices and the relay system, and a basis is provided for disaster prevention and reduction.

An electromagnetic damping type transmission conductor galloping suppression device comprises a conductor spacer and an electromagnetic damping device used for suppressing conductor galloping. The electromagnetic damping device comprises two metal pipes which are fixedly connected in a crossed mode. Each metal pipe is provided with two containing cavities, and the two containing cavities in each metal pipe are formed in the two sides of the crossed and fixedly-connected position of the two metal pipes correspondingly. The two metal tubes are oppositely fixed on the inner side or below the conductor spacer; the electromagnetic damping device further comprises four permanent magnets which are arranged in the containing cavity in a sleeved mode and can move relatively and freely. According to the device, induced eddy current is generated through relative movement between the permanent magnet and the metal pipe and reacts on the magnetic pole, and the purposes of widening the vibration absorption frequency range and improving the suppression effect are achieved.

The invention discloses a conductor galloping on-line monitoring method and device based on rectangular image detection, and the method comprises the steps: installing a rectangular marker at a conductor sag point, erecting an infrared night vision camera on a tower, shooting the marker, obtaining video data, processing the video data, so that center coordinates of the rectangular marker are obtained, and then the information such as the conductor galloping track and the maximum amplitude of conductor galloping is obtained. According to the invention, conductor galloping can be monitored in real time, and the conductor galloping identification rate and detection precision are improved.

The invention discloses a method and a system for evaluating the fatigue life of a high-voltage composite cross arm, and the method comprises the steps: calculating the dynamic mounting force of the cross arm generated by the conductor galloping of a high-voltage transmission line according to the conductor galloping theory; establishing a finite element model of the high-voltage composite cross arm, determining a key section with the maximum stress, applying a dynamic load to extract a stress time history of the key section in the cross arm structure, and taking the stress time history as a basis for fatigue evaluation; fitting a stress amplitude-fatigue life S-N curve by utilizing fatigue test data of the composite cross arm, estimating the service condition of the composite cross arm byutilizing historical data of conductor galloping, and estimating the expected fatigue life of the composite cross arm. According to the method, a more complete method for evaluating the service lifeof the high-voltage composite cross arm structure is formed, so that the service life evaluation of the high-voltage line cross arm is more accurate.

The invention relates to an anti-galloping phase-to-phase spacer. The anti-galloping phase-to-phase spacer is characterized in that the anti-galloping phase-to-phase spacer comprises a sub-conductor spacer (1), a damping device (2) and a connecting fitting (3); the sub-conductor spacer (1) is connected with the connection fitting (3) through the damping device (2). According to the anti-gallopingphase-to-phase spacer of the technical scheme provided by the invention, the damping device is introduced between the fitting and the sub-conductor spacer, so that the problem that the connecting fitting for the phase-to-phase spacer is broken when a conductor gallops is solved.