21 results about "Discharge location" patented technology

The invention belongs to the field of cable partial discharge monitoring, and particularly relates to a cable partial discharge positioning system. The invention provides a cable partial discharge positioning system, which comprises the following steps of: dividing different areas according to signal propagation characteristics of a cable line, arranging monitoring sensors at different intervals, and arranging calibration sensors at the abrupt change positions of the intervals; transmitting a reference UHF pulse signal through a calibration sensor, and calibrating time delay measurement data of an adjacent monitoring sensor; each monitoring sensor receives a discharge source signal of a discharge cable, and extracts signal time delay data after preprocessing; time delay data of multiple monitoring sensors and cable characteristic parameters are fused, and the position of a discharge source is calculated through a positioning algorithm. According to the cable partial discharge positioning system provided by the invention, on the basis of the maximum allowable spacing calculated by the time delay error-sensor spacing correlation model, the monitoring sensor spacing is determined in combination with the signal attenuation characteristics of the directly-buried section, and sparse deployment is realized.

Disclosed is an electric power equipment internal discharge position and spectral information multiplexing photoelectric sensing device, in a bipolar plate structure, a split light guide array is inserted into the interior of the electric power equipment to collect the discharge light beams from the interior of the electric power equipment, a microlens homogenizing plate is arranged at the bottom of the split light guide array, the upper surface of the microlens homogenizing plate is etched with a microlens array for focusing light signals to form parallel light beams; a fiber panel is arranged at the bottom of the microlens homogenizing plate, the upper panel is a central-symmetrical planar multi-lobe structure to group the parallel light beams, the lower panel is connected to the upper panel through a fiber bundle, and the lower panel is a rectangular structure to group the parallel light beams from the upper panel to form photon signals; a photoelectric array includes a silicon photomultiplier array and a surface spectral coating arranged on the silicon photomultiplier array, and the multiplexing two-dimensional photoelectric array constructs a sparse spectral sensing line array based on the photon signals to generate spectral information and constructs a multi-normal intensity sensing line array to obtain position information.

This invention discloses an automatic identification method for the polarity of high-frequency pulse current waveforms based on deep learning, belonging to the field of power equipment insulation fault detection technology. This method deeply utilizes the characteristics of the pulse signal waveform to identify the first wave and its polarity. Firstly, under laboratory conditions, the propagation characteristics of the first wave at different typical discharge locations and types are obtained by injecting steep pulses. The response signal waveforms at each outgoing line coupling end are measured. Then, using the waveform sequence as input vectors, a deep learning network is constructed. Considering convolutional neural networks, a sample library of typical response waveforms for each injection method and location is established using a digital image matrix as input. The sample library is continuously expanded through adversarial learning. An artificial neural network is used to train the first wave waveform and polarity on the input waveform sequence, and then uses the artificial neural network to identify waveform details. This achieves fully automatic first wave polarity identification, suitable for real-time algorithm applications in online monitoring.

The invention provides a cable joint partial discharge positioning method and system based on a flexible electromagnetic sensor array, and relates to the technical field of cable joint partial discharge. According to the technical key points, the method comprises the following steps: acquiring a plurality of signal intensities measured by a plurality of sensing units deployed on the surface of the cable joint in real time; processing based on the plurality of signal intensities so as to detect and position the partial discharge part of the cable joint, comprising the following steps: calculating a plurality of distances between the partial discharge part and the plurality of sensing units; establishing a plurality of three-dimensional geometric distance equations according to the plurality of distances, and carrying out simultaneous solution on the plurality of three-dimensional geometric distance equations to obtain three-dimensional coordinates of the partial discharge part; a unit calibration and error compensation mechanism is further adopted to correct the distance, and then the position of the partial discharge part is corrected. According to the invention, non-intrusive installation can be realized by adopting the flexible electromagnetic sensor, high-precision space positioning of a partial discharge part is realized by combining a partial discharge positioning algorithm, and a detection blind area is effectively eliminated.

This invention proposes a high- and low-voltage line strong discharge monitoring system and method based on video image recognition, relating to the field of strong discharge monitoring. It includes a camera for acquiring video streams of high- and low-voltage lines and sending them to an image analyzer; the image analyzer extracts keyframe images from the video streams, extracts static and dynamic spark features based on the keyframe images, and inputs a feature vector composed of these features into an extreme learning machine for spark recognition, generating a discharge warning signal, which is then sent to a remote server; the remote server receives and displays the discharge warning signal. This invention improves the accuracy of video spark image recognition and can quickly and accurately determine the discharge location, ensuring the safe and stable operation of the power grid and reducing economic losses caused by transmission line discharge faults, thus having significant social and economic implications.

A GIS field-electrical fusion real-time condition awareness and early warning system and method, comprising an embedded synchronized signal acquisition and measurement unit (100) and an industrial personal computer (200), wherein a simulator (201), a partial discharge source locator (202), and an early warning device (203) are deployed on the industrial personal computer (200); when the embedded unit (100) detects, according to a strongly correlated feature, that an electromagnetic field signal within a GIS comprises a partial discharge signal, the embedded unit (100) obtains a full time-domain waveform plot comprising a time-domain waveform plot and a frequency-domain waveform plot of the partial discharge signal; the simulator (201) performs coarse positioning on a partial discharge source on the basis of the full time-domain waveform plot of the GIS partial discharge, and performs simulation-enhanced computation by using a coarse positioning result as an initial injection point, so as to obtain simulation-enhanced data for the partial discharge source; the partial discharge source locator (202) performs iterative searching on a measured discharge intensity calculated according to the full time-domain waveform plot and a simulation-enhanced result, so as to obtain an actual discharge location of the partial discharge source; and the early warning device (203) performs early warning on the basis of a full waveform in a time domain and early warning information comprising the actual discharge location of the partial discharge source.

This invention provides a partial discharge detection device for switchgear, relating to the field of switchgear detection. The device includes three sensors for detecting partial discharge and two supports with extensions at a certain angle. The three sensors are located at the intersection of the supports and at two distal ends. Visible light emitters are positioned at the intersection and one of the distal ends of the supports, mounted on a rotating disk controlled by a servo motor. The rotating disk is concentric with the intersection and distal ends of the supports. The supports are configured to receive signals from the three sensors and control the rotation angle of the rotating disk. This device detects the distance to the discharge location using the three sensors and calculates the discharge position. It uses two visible light emitters to emit visible light, adjusts the angle, and determines the discharge location by the intersection of the two beams. This setup allows for relatively convenient location of the discharge.

The invention discloses a method and a device for positioning a discharge position of a distribution cable, and electronic equipment. The method comprises the following steps: acquiring a working condition scene and a plurality of discharge pulse signals; determining a signal frequency interval according to the working condition scene; determining a plurality of signal waveform sequences in one-to-one correspondence with the plurality of discharge pulse signals; according to the execution sequence of the multiple signal waveform sequences, amplitude parameters corresponding to the multiple frequency points respectively are determined for any signal waveform sequence according to the signal frequency interval until the multiple signal waveform sequences are executed completely, and the amplitude parameters corresponding to the multiple frequency points respectively corresponding to the multiple signal waveform sequences are obtained; and positioning the discharge position of the target cable according to the amplitude parameters respectively corresponding to the plurality of frequency points respectively corresponding to the plurality of signal waveform sequences. According to the invention, the technical problem that the positioning of the discharge position is inaccurate when the discharge position of the distribution cable is positioned in the prior art is solved.

A method and apparatus for cleaning pipelines or systems by way of a pipeline section partially filled with flushing liquid being subjected to modulating compressed-gas pulses to form alternating blocks of liquid and blocks of gas, which, for the purpose of removing deposits from the pipeline walls, are driven in a pulse-like manner through the pipeline along a flushing section from an infeed location to a discharge location. A preliminary section may be arranged upstream of the flushing section, for the purpose of accelerating the liquid volume in the pipeline or the system. The preliminary section is partially filled with the flushing liquid and is dimensioned, in respect of its geometry, diameter and / or length, such that, when subjected to a compressed-gas mixture, the blocks of liquids can form fully within the preliminary section so as to fill the cross section of the following flushing section as they pass through it.

The invention relates to a discharge positioning device of discharge equipment, belongs to the technical field of discharge equipment detection, and solves the problems of high operation detection cost and low precision of the discharge equipment in the prior art. The discharge positioning device comprises a plurality of antennas; a plurality of envelope detectors, each of which is connected with one antenna and is used for demodulating the antenna signal and outputting a low-frequency detection signal; a plurality of shaping circuits, each of which is connected with one envelope detector and is used for processing the low-frequency detection signal and outputting a discharge pulse signal to the FPGA; the FPGA is used for counting each input discharge pulse signal according to a plurality of counting clocks to obtain the time when each antenna receives the original partial discharge signal; and the positioning module is used for positioning the discharge position of the discharge equipment according to the time when each antenna receives the original partial discharge signal and the position of each antenna. The low-cost detection of the safe operation of the discharge equipment is realized, and the precision is high.

This invention discloses a partial discharge detection device for high-voltage cables, relating to the field of discharge detection technology. The device includes a lower housing with a main drive motor installed inside. Two clamping wheels are symmetrically mounted on the main drive motor. A lower detection half-ring is installed inside the lower housing. An upper housing is hinged to the lower housing, and an upper detection half-ring and a processing terminal are mounted on the upper housing. The upper and lower housings together form a rectangular detection housing. The cable passes through openings at both ends. Starting the main drive motor drives the clamping wheels to rotate. Both clamping wheels move the entire detection device along the cable through friction with the cable. The upper and lower detection half-rings detect pulse signals on both sides of the cable to determine whether there is partial discharge or damage. This device allows for continuous detection of high-altitude cables, accurately pinpointing the discharge location, improving detection efficiency, and reducing worker workload and safety risks.

The application discloses a power distribution cable discharge position determination method and device. The method comprises the following steps: obtaining a plurality of discharge pulse signals of a power distribution cable; determining a plurality of signal wave band sets corresponding to the plurality of discharge pulse signals respectively; determining signal polarities corresponding to the plurality of discharge pulse signals respectively according to the plurality of signal wave band sets corresponding to the plurality of discharge pulse signals respectively; and determining a target discharge position corresponding to the power distribution cable according to the signal polarities corresponding to the plurality of discharge pulse signals respectively. The application solves the technical problem that in the prior art, the position of partial discharge of a power distribution cable cannot be accurately determined under a complex operation environment, and thus effective monitoring and diagnosis of the partial discharge of the power distribution cable cannot be realized.

The invention discloses a transformer partial discharge positioning detection method, equipment and a medium, and relates to the technical field of power equipment state monitoring and fault positioning. The invention aims to solve the problems of time difference and indirect wave positioning interference in the existing transformer partial discharge positioning technology. According to the invention, when partial discharge occurs in a tested transformer, different types of discharge signals at each positioning point are collected; the arrival time of each discharge signal is extracted by adopting a dual-threshold method, and then the arrival time delay of each discharge signal is calculated; constructing a transformer partial discharge positioning equation by using the arrival time delay of each discharge signal and the propagation velocity of each discharge signal in the transformer insulating oil; substituting the position coordinates of the positioning points into the transformer partial discharge positioning equation to obtain discharge source coordinates of different types of discharge signals; and carrying out weighted summation on the discharge source coordinates of the different types of discharge signals to obtain the partial discharge coordinates of the transformer.

This application discloses a method, apparatus, equipment, and medium for rapid partial discharge location in gas-insulated switchgear, relating to the field of partial discharge location technology. The method includes: determining adjacent sensor pairs and the straight-line distance between them; performing bidirectional pulse injection calibration on the adjacent sensor pairs to obtain bidirectional equivalent attenuation coefficients; determining the structural symmetry of the segment where the adjacent sensor pairs are located based on the bidirectional equivalent attenuation coefficients; selecting a model type based on the structural symmetry determination results; acquiring the actual partial discharge signals of two sensors in the adjacent sensor pairs to obtain the corresponding actual partial discharge signal amplitudes; and determining the location of the partial discharge source based on the bidirectional equivalent attenuation coefficients, the actual partial discharge signal amplitudes, the straight-line distance, and the model type. This method can improve the accuracy of partial discharge location in GIS.

This invention provides a method for locating partial discharge in a transformer using multi-group ultra-high frequency (UHF) sensors, comprising: acquiring n partial discharge signals; calculating the time difference between each pair of UHF sensors receiving the UHF partial discharge signals; selecting one of the four UHF sensors as a reference sensor, establishing a set of partial discharge source location equations based on the time difference between the propagation of the UHF signal generated by the partial discharge source to the reference sensor and the other three sensors, and obtaining the partial discharge source location results for the grouped UHF sensors; obtaining a location error weighting factor for the location result obtained under the k-th group; establishing an optimized coordinate search function for the partial discharge source based on the location result of each group and the location error weighting factor of each group, and obtaining the three-dimensional coordinates of the partial discharge source inside the transformer in space. This invention reduces the dependence of the location result on the time delay accuracy and effectively improves the location accuracy of the partial discharge source.

The present specification relates to an electrode slurry providing device, a coating device, and a die coater. The electrode slurry providing device may include a tank configured to accommodate electrode slurry therein, a main pipe having one end connected to the tank at a discharge location, and two or more branch pipes configured to discharge the electrode slurry from the main pipe. Each branch pipe may be connected to the main pipe at a respective junction, each junction may be located at a horizontal distance away from the discharge location and at a vertical drop below the discharge location, and the vertical drop of each junction may become greater as the horizontal distance of the junction from the discharge location becomes greater.

This invention discloses a partial discharge location and detection system for ultra-high current wear-resistant liquid-cooled cables, belonging to the field of cable partial discharge detection technology. It forms a complete partial discharge location and detection solution for ultra-high current wear-resistant liquid-cooled cables through unit collaborative work, completely solving the core problem of difficult elimination of false discharge interference in traditional detection technologies. Through multi-parameter correlation analysis, it achieves accurate differentiation between false and real discharges, significantly reducing the false detection rate and providing a reliable basis for subsequent maintenance work. Simultaneously, it achieves focused and efficient partial discharge detection by dividing high / low probability partial discharge points, focusing on high-incidence areas to reduce detection intensity, avoiding the inefficiency of indiscriminate detection across the entire line, and improving the efficiency and accuracy of partial discharge location.

The application discloses a transformer partial discharge positioning method based on photoelectromagnetic signal fusion. The method fuses partial discharge ultrahigh frequency, high frequency current and micro-light three signals, and adaptively selects the optimal positioning strategy through analyzing the ultrahigh frequency preliminary positioning result and the response of different sensors. Specifically, firstly, the arrival time difference method is adopted based on the ultrahigh frequency signal to carry out preliminary positioning, and the three-dimensional model is automatically used to distinguish whether the preliminary discharge point is located inside or outside the winding, and then the multi-end high frequency current positioning or the light-electric combined positioning strategy is selected, and finally, the result is visualized and output in the transformer three-dimensional model. The application can significantly improve the transformer partial discharge positioning precision, and provides a reliable basis for transformer fault diagnosis.

The invention relates to the technical field of power equipment detection, in particular to a GIS partial discharge automatic positioning and processing method. The method comprises the following steps: S1, building a GIS simulation model; s2, extracting an original signal for effective judgment; s3, calculating a discharge position according to the effective signal; s4, grading the signals, and determining a final discharge position; s5, performing dynamic discharge position updating operation; and S6, determining an early warning level, and taking corresponding measures. The method has the advantages that the electromagnetic wave velocity is corrected by introducing temperature and pressure, so that the positioning accuracy can be effectively improved; the loss of the AI model can be effectively reduced through signal grading processing, and the cost is reduced; according to the development trend of the partial discharge source, the influence area of the discharge source can be monitored in a targeted manner, so that on one hand, the monitoring strength is improved, and on the other hand, resource loss in irrelevant areas is reduced; the early warning stage treatment further reduces the cost on the basis of ensuring effective treatment of discharge of the discharge source.

This invention discloses a method for verifying the structural safety of an oil-immersed transformer in the event of a high-energy arc fault, and also discloses a system and medium for verifying the structural safety of an oil-immersed transformer in the event of a high-energy arc fault. The structural safety verification method for an oil-immersed transformer in the event of a high-energy arc fault is a transient verification method, which can reflect the mechanical response of the transformer tank structure throughout the discharge process, clearly define the discharge location, and can well reflect the transmission, development and non-uniformity characteristics of the pressure wave excited by the arc fault. It can also consider the influence of pressure relief on pressure development and the mechanical response of the transformer tank structure, and can also consider the influence of the transformer tank strain rate and stress state on the mechanical properties of the tank material.

This invention discloses a method, apparatus, and electronic device for locating partial discharge in transformer windings. The method includes: determining the actual energy ratio of the transformer winding; determining a discharge region and multiple candidate fault points within the discharge region based on the actual energy ratio; determining a first correlation coefficient between the first-end spectral transfer function and the first-end measured spectrum for each candidate fault point, and a second correlation coefficient between the last-end spectral transfer function and the last-end measured spectrum for each candidate fault point; and determining the partial discharge location result of the transformer winding based on the first and second correlation coefficients for each candidate fault point. This invention solves the technical problem of low accuracy in locating partial discharge sources in transformer windings in related technologies.