40 results about "Partial discharge analysis" patented technology

The invention provides a multi-feature-parameter-based comprehensive fault diagnosis method of a transformer. The method comprises: partial discharging of a transformer is classified into different partial discharge classes; a partial discharge signal is obtained by a partial discharge analyzer; feature extraction is carried out on the signal; a specific partial discharge type is identified by using a Fisher classification method; a vibration signal of the transformer is monitored and analyzed to determine the state of the transformer; if a partial discharge signal is monitored, a diagnosis iscarried out based on partial discharge signal diagnosis and DGA diagnosis knowledge rules; and if a partial discharge signal and a vibration signal are monitored simultaneously, a diagnosis is carried out based on the vibration signal, the partial discharge signal, and the DGA diagnosis knowledge rules and comprehensive diagnosis is carried out according to a collaborative diagnosis rule. The diagnosis method has high openness; and when a new monitoring quantity is added, the diagnostic processes of other monitoring data do not need to be changed.

A system for detecting partial discharge activity in an electrostatic precipitator is provided. The system includes one or more sensors configured to receive and transmit signals representative of voltage or current behavior of the electrostatic precipitator. The system also includes a processor configured to receive the signals from the one or more sensors and configured for detecting one or more occurrences of partial discharge activity in the electrostatic precipitator.

The invention relates to the field of power technologies, and particularly to a partial discharge detection device and method of a power cable terminal. The device is composed of a partial discharge sampling lower computer and a partial discharge analyzing upper computer which are connected through wireless signals. If a partial discharge is analyzed by the IPCs to be a dangerous discharge which can lead to power cable breakdown, the partial discharge detection device of the power cable terminal can pop up a warning prompt to inform that a serious fault of the cable occurs; is the partial discharge is determined to be a potentially-dangerous discharge which cannot lead to power cable breakdown, the device pops up a warning prompt to inform that potential danger fault of the cable occurs, so that partial discharge detection and warning of the power cable can be achieved. According to the partial discharge detection device and method of the power cable terminal, an electric field sensor and a magnetic field sensor are simple in structure and easy to operate and can work normally under severe external interference; meanwhile, a power transmission line high-potential energy-gaining power source which is low in energy consumption and stable in power supply is utilized, so that not only energy is source saving achieved, but also the stability of the whole device is improved.

The invention discloses a method and a device for judging GIS partial discharge amount by using SF6 acidic decomposer concentration. The device comprises GIS equipment (1) taking an SF6 gas as an insulating medium, a GIS equipment gas taking valve (2), an SF6 acidic decomposer concentration detection device (3), an ultrasonic partial discharge sensor (4), an ultrasonic partial discharge detectiondata processing and display (5), an ultrahigh-frequency partial discharge sensor (6) and an ultrahigh-frequency partial discharge detection data processing and display (7). The method comprises the following steps of: oxidizing a low-valence sulfide in an SF6 acidic decomposer into a water-soluble high-valence sulfur oxide SO3 by using the SF6 acidic decomposer concentration detection device; dissolving the SO3 in water to generate H2SO4, performing titration on the H2SO4 by using a standard alkali liquor, and calculating mass concentration of the acidic decomposer represented by the S element; and combining the detection result with the ultrahigh frequency and ultrasonic partial discharge analysis results, and comprehensively judging the discharge amount of the GIS equipment. According tothe method and the device, the latent partial discharge capacity in the GIS equipment can be precisely judged, and the stable operation of the power grid is ensured.

The present invention relates to an online monitoring technology of power supply rectifying equipment, in particular to an intelligence expert analysis method for the electric security of electrolytic aluminum. The intelligence expert analysis method for the electric security of the electrolytic aluminum comprises a data acquisition layer, a data storage layer, and a data application and analysis layer. The analysis method comprises the steps of a data acquisition step, a data storage step, and a data application and analysis step. The present invention has the advantages that the method is a total solution which integrates the comprehensive analysis results of oil chromatogram analysis data, load sharing analysis data, partial discharge analysis data, and oil temperature analysis data and display together. The present invention realizes the detection to the running state of the key link of a power supply system, provides an analysis report on the running state of a power supply system, promptly discovers the hidden danger of the equipment, reduces the damage factor of the power equipment, and avoids the great direct economic loss caused by accidents. The intelligence expert analysis method for the electric security of the electrolytic aluminum is suitable for the automated control system of the power supply system.

A system for detecting partial discharge activity in an electrostatic precipitator is provided. The system includes one or more sensors configured to receive and transmit signals representative of voltage or current behavior of the electrostatic precipitator. The system also includes a processor configured to receive the signals from the one or more sensors and configured for detecting one or more occurrences of partial discharge activity in the electrostatic precipitator.

The invention relates to a cable buffer layer partial discharge testing device capable of controlling temperature and humidity. The cable buffer layer partial discharge testing device is mainly and technically characterized by comprising an alternating-current voltage-withstanding source, a testing electrode, a constant-temperature and constant-humidity box and a partial discharge acquisition device, wherein the testing electrode and a to-be-tested sample are installed in the constant-temperature and constant-humidity box, and the temperature and humidity in the testing process are controlledthrough the constant-temperature and constant-humidity box; the high-voltage electrode is connected with the high-voltage side of the alternating-current voltage-withstanding source through the protective resistor, the grounding electrode is connected with the ground wire side of the alternating-current voltage-withstanding source, a to-be-tested sample is installed between the high-voltage electrode and the grounding electrode and is in close contact with the high-voltage electrode and the grounding electrode, and the partial discharge acquisition device is installed between the grounding electrode and the ground wire side of the alternating-current voltage-withstanding source. The testing electrode and the to-be-tested sample are installed in the constant-temperature and constant-humidity box, the partial discharge analyzer is adopted, the partial discharge test function of the high-voltage cable buffer layer in different temperature and humidity environments is realized more accurately by controlling the temperature and humidity environment of the test, and the partial discharge test requirement of the high-voltage cable buffer layer is met.

A partial discharge analysis (PDA) coupling device is provided. In one embodiment, a device includes: a connector electrically connecting a first coupling capacitor and a second coupling capacitor; a first conductive rod for electrically connecting the first coupling capacitor to a high voltage input; a second conductive rod for electrically connecting the second coupling capacitor to ground; a current transformer substantially surrounding a portion of the second conductive rod, the current transformer configured to generate a pulse signal; and a reference signal generator adjacent to the current transformer configured to generate a reference signal in phase with the pulse signal.

The invention provides a GIS partial discharge type identification method based on a deep residual network, and the method comprises the following steps: setting an ultrahigh-frequency sensor at detected GIS electrical equipment, receiving and processing a discharge signal collected by the ultrahigh-frequency sensor through a partial discharge detection tool, and generating a PRPD spectrogram through a partial discharge analysis tool; summarizing the PRPD spectrograms of the tested GIS electrical equipment, classifying the PRPD spectrograms according to the characteristics of the partial discharge defect spectrograms, and setting labels to generate a training set; building a deep residual neural network classification model according to the size of the PRPD spectrogram in the training set,and determining model parameters; training the deep residual neural network classification model through the PRPD spectrogram of the training set and the corresponding category label, calculating thetest accuracy, and adjusting the weight of each model parameter according to the test accuracy; and judging the PRPD spectrogram of an unknown type by using the trained deep residual neural network classification model.

The invention discloses a high voltage switch cabinet partial discharge analysis method. The high voltage switch cabinet partial discharge analysis method comprises that: partial discharge information is obtained; a low frequency signal is filtered; a data quantity which is sampled in a cycle is read by a microprocessor; the microprocessor performs FFT transformation on the data; the microprocessor draws a waveform graph and a frequency spectrum graph; low frequency signal filtering is performed after partial discharge information is obtained; the microprocessor reads a data quantity sampled in a cycle; an FFT transformation is performed on the data by the microprocessor; and the waveform graph and the frequency spectrum graph are drawn by the microprocessor. The invention is a switch device partial discharge signal mode identification method based on S transformation and a DBN network and can accurately analyze partial discharge information and discharge capacity online in real time.

The invention discloses an SF6 gas-insulated metal-enclosed complete alternating-current voltage-withstanding and partial-discharge test device. The device comprises a reactor tank, a transition tank, a right-angle tank, a capacitor tank and a three-way butt joint tank; the electric reactor tank, the transition tank, the three-way butt joint tank, the right-angle tank and the capacitor tank are sequentially isolated by basin-type insulators, and each tank is filled with SF6 gas as an insulating medium. According to the complete test device, SF6 gas is used for insulation, the device is light in weight and small in size, the limitation of lifting tools, placing places and the like in a GIS hall of an underground powerhouse can be effectively solved, meanwhile, a high-voltage loop adopts a totally-closed tank structure, other external electromagnetic interference and pulse signals in a plant station can be effectively shielded, a coupling capacitor for partial discharge test is arranged, the partial discharge test can be carried out by adopting the principle of a pulse current method, and the partial discharge test device has obvious advantages on partial discharge analysis in an insulation verification test after GIS handover test or GIS maintenance.

The invention relates to a partial discharge detection system for an intermediate joint of a 10kV insulated tubular bus. The partial discharge detection system is characterized by comprising a differential detection loop, a filtering and amplifying unit, a high-speed data acquisition card, a computer host and a touch screen display, wherein the differential detection loop is formed by connecting a capacitive sensor and a detection impedor, the capacitive sensor adopts metal foil electrodes which are laid on two sides of the intermediate joint of the tubular bus, and an equivalent capacitor is formed between an outer layer sheath and a grounding shield; and an output end of the differential detection loop is connected with the filtering and amplifying unit for carrying out noise suppression and signal amplification, an output end of the filtering and amplifying unit is connected to the high-speed data acquisition card installed in the computer host, and partial discharge analysis software is installed in the computer host. The partial discharge detection system picks up a partial discharge signal based on the capacitive sensor and the differential detection loop, achieves the effect of providing abundant decision-making information for technicians by utilizing the partial discharge detection function of the intermediate joint of the tubular bus, and is convenient to carry out construction and maintenance operations on the tubular bus.

The invention discloses a mobile partial discharge remote diagnosis and detection system and a partial discharge positioning method. The mobile partial discharge remote diagnosis and detection systemcomprises an on-site partial discharge acquisition module, a far-end wireless transceiving unit, a near-end wireless transceiving unit and a data analysis host. The on-site partial discharge acquisition module is connected with the far-end wireless transceiving unit through a communication optical cable. The on-site partial discharge acquisition module comprises a high-frequency partial dischargesensor, a synchronous coil and a partial discharge acquisition unit; the far-end wireless on-site element transmits partial discharge acquisition data to the near-end wireless on-site unit through a wireless network. And the near-end wireless transceiving unit is connected with the partial discharge analysis host through an RJ45 network cable. The detection system can change an installation placeaccording to requirements, perform fixed-point continuous monitoring on the partial discharge state quantity within a certain period of time under an operation condition, and upload monitoring data toa remote diagnosis host for storage, management and comprehensive analysis. The main step of the detection method is to locate the partial discharge.

The invention relates to a large-scale hydro-generator stator winding partial discharge analysis system, which comprises a time-delay-free conversion system, a synchronous signal clock system, a partial discharge signal high-speed acquisition system and a partial discharge data analysis system. The time-delay-free conversion system accesses a voltage signal from a generator outlet high-voltage test loop; then the voltage signal is linearly reduced and then is respectively input into a synchronous signal clock system and a partial discharge signal high-speed acquisition system, and the synchronous signal clock system is used for generating a synchronous clock signal synchronous with the voltage signal; the partial discharge signal high-speed acquisition system is used for performing high-pass filtering, analog-to-digital conversion and storage on the reduced voltage signal; and finally, the partial discharge data analysis system is used for processing the partial discharge data. According to the partial discharge analysis system, the data calculation amount and the configuration cost can be greatly reduced.

The invention relates to a terminal partial discharge monitoring method based on high-frequency electric field change and a system thereof, and belongs to the technical field of partial discharge monitoring. An electric field monitoring device is adopted; the electric field monitoring device comprises a high-frequency voltage sensor and a signal processing device; the method comprises the following steps: making signals acquired by the electric field monitoring device into an electric field distribution matrix, analyzing matrix data, and judging that electric field distribution is abnormal when a mean square error reading of the matrix data is greater than a matrix average value; if the electric field distribution is abnormal, searching historical data of the electric field monitoring device, and comparing the historical data with the historical data to obtain a partial discharge analysis file; making an electric field change trend chart through a partial discharge analysis file; and extracting a maximum change value and a maximum change rate in the electric field change trend chart, when the maximum change value or the maximum change rate is greater than a preset early warning value, performing partial discharge signal early warning, and prompting a cable fault risk. The system is convenient to use, can realize terminal partial discharge monitoring, and is easy to popularize and apply.

The invention provides an ultrasonic partial discharge detection and analysis model based on big data, and the model comprises an input unit which obtains a to-be-detected ultrasonic signal collectedfrom power distribution equipment; a big data unit which is used for acquiring big data samples of the ultrasonic signals generated by partial discharge of the power distribution equipment, wherein the big data samples comprise a plurality of sample ultrasonic signals and corresponding partial discharge types; a feature extraction unit which is used for carrying out feature extraction processing on the ultrasonic signal to be detected and the sample ultrasonic signal and outputting the feature parameters of the ultrasonic signal; a model training unit which is used for forming a training set by adopting the characteristic parameters of the sample ultrasonic signals and the corresponding partial discharge types to train a partial discharge detection model and outputting the trained partialdischarge detection model; and a partial discharge analysis unit which is used for inputting the characteristic parameters of the ultrasonic signal to be detected into the trained partial discharge detection model and outputting the partial discharge type of the ultrasonic signal to be detected. Partial discharge detection is carried out according to the big data samples, the accuracy is high andthe reliability is high.

The invention relates to a multi-means-integrated charged detection system for a combined electric appliance. The multi-means-integrated charged detection system is technically characterized in that the system comprises an ultrasonic detection unit, a high-frequency detection unit, an ultrahigh-frequency detection unit and a high-speed oscilloscope. The ultrasonic detection unit, the high-frequency detection unit and the ultrahigh-frequency detection unit are arranged on the combined electric appliance, detect corresponding signals respectively and send the detected results to the high-speed oscilloscope. The high-speed oscilloscope finds out various partial discharge defects in the combined electric appliance by detecting and analyzing three partial signals of super-high frequency, high frequency and ultrasonic wave through built-in comprehensive partial discharge analysis and diagnosis software. By means of the multi-means-integrated charged detection system, various partial discharge defects in the combined electric appliance can be effectively detected, the accuracy and reliability of the detection result are improved, and the multi-means-integrated charged detection system has the advantages of being simple in structure, high in sensitivity, convenient to implement and the like and meets the actual application requirement for field detection.

The invention discloses a high-voltage cable partial discharge online detection system and a detection positioning method. The system comprises a plurality of signal acquisition modules which are a first signal acquisition module, a second signal acquisition module, a third signal acquisition module and a fourth signal acquisition module; the signal acquisition modules are arranged at different positions of a high-voltage cable. Output ends of the acquisition modules are connected to an input end of a partial discharge detection module. An output end of the partial discharge detection module is connected to a partial discharge analysis module; wherein each signal acquisition module comprises a signal acquisition sensor, a protection unit and a signal conditioning unit, an output end of thesignal acquisition sensor is connected to the signal conditioning unit through the protection unit, an output end of the signal conditioning unit is connected to the partial discharge detection module, and the output end of the partial discharge detection module is connected to an input end of the partial discharge analysis module. The detection efficiency is improved, the structure is simple, and the practicability is high.

A method for monitoring partial discharges in an electric power transmission system includes the steps of: detecting electric pulses from a component of the electric power transmission system, repeating a battery of different tests adapted to provide each a result indicative of partial discharge activity, the tests being continuously performed in succession one after the other in a preset period of time, each including a set of operations of acquisition and evaluations of the detected electrical pulses, and differing each other for a plurality of different combinations of values taken by test parameters used for executing the acquisition and evaluation operations; analyzing the results obtained with time by the batteries of tests executed at different execution times in the present period of time; and generating an alarm depending on the outcome of the analysis step.

The invention discloses an indoor cabinet partial discharge signal detection system, and the system is characterized in that a multi-sensor module comprises an ultrahigh frequency sensor, a ground voltage sensor and an ultrasonic sensor, and is used for obtaining a partial discharge signal through various sensors, and obtaining an ultrahigh frequency signal, a ground electric wave signal and an ultrasonic signal; the multiplexing front-end circuit is used for performing path adjustment through a relay and an amplifier and converting the ultrahigh-frequency signal and the ground electric wave signal into voltage to be conditioned, and the voltage to be conditioned comprises ultrahigh-frequency voltage and ground electric wave voltage; the multiplexing conditioning unit is used for carrying out filtering operation, detection operation and signal amplification operation on the voltage to be conditioned to obtain a voltage conditioning signal; and the data processing unit is used for carrying out diagnosis, display, storage and partial discharge analysis operation on the voltage conditioning signal and the conditioned ultrasonic signal. The technical problems that the application cost is high and the efficiency is low due to the fact that equipment in the prior art is large in size and single in detection information are solved.

The invention provides an independent multichannel partial discharge analysis platform, and the platform comprises a signal processing display unit, a high-speed collection unit, signal conditioning units, and program control filtering units. The signal processing display unit is connected with the high-speed collection unit, the high-speed collection unit is connected with the signal conditioningunits, and the signal conditioning units are connected with the program control filtering units. The number of the signal conditioning units is not less than two, and the number of the program control filtering units is not less than two. The signal conditioning units are connected with the high-speed collection unit. The platform achieves the independent multichannel digital-type partial discharge measurement, and carries out the synchronous sampling, processing and display, wherein the synchronization error is less than 1ns. The platform is high in sampling rate, and employs multichannel simultaneous collection, wherein the maximum sampling rate of each channel is 80MS / s. The platform can achieve the effective discrimination of a discharge signal in a 0.3m range, and is widely used in partial discharge testing of high-voltage power equipment, including equipment delivery inspection, acceptance test, detection after overhaul, and pre-testing. The platform is provided with an expert analysis system. The platform can accurately analyze a partial discharge quantity of equipment, and can analyze the insulating conditions of the equipment.

The invention relates to a converter transformer oil paper insulation partial discharge state evaluation method. The method comprises the following steps: S1, collecting a partial discharge signal; s2, establishing a partial discharge analysis mode three-dimensional spectrogram based on the phase, the time difference and the discharge repetition rate; s3, performing one-dimension and principal component analysis on a spectrogram matrix; s4, establishing a random forest classification model; and S5, evaluating the discharge state. The invention aims to provide the method for evaluating the partial discharge state of the oil paper insulation of the converter transformer, which can improve the adaptability of a detection method for evaluating the partial discharge state of the converter transformer under the AC / DC composite voltage and a discharge equivalent model and enhance the reliability of insulation state monitoring.

The invention relates to a partial discharge detection device and method. The partial discharge detection device comprises a plurality of partial discharge detection sensors and a partial discharge analyzer, wherein the partial discharge detection sensors are arranged inside a plurality of ring main units respectively and are used for collecting optical signals inside the ring main units; each ring main unit is correspondingly provided with one partial discharge detection sensor; and the partial discharge analyzer is connected with all the partial discharge detection sensors and is used for analyzing partial discharge conditions inside all the ring main units in combination with the optical signals collected by all the partial discharge detection sensors. Through the partial discharge detection device and method, on the one hand, the situation that it is difficult to accurately judge a partial discharge occurrence position due to the complexity inside electrical equipment can be avoided; and on the other hand, simultaneous online detection of the partial discharge conditions of the multiple ring main units also can be realized, and the working efficiency of detection and maintenance is improved.

The invention relates to a series-resonance voltage-withstanding partial discharge test device adopting a fixed duty ratio square wave frequency conversion power supply. The device comprises the 1:1 fixed duty ratio square wave frequency conversion power supply. After an excitation transformer adjusts a voltage, the power supply applied the voltage to a sample cable. The sample cable is connected in parallel to a partial discharge collector so as to collect partial discharge signals. The partial discharge signals are transmitted to a partial discharge analysis system so as to analyze. A switching point of a change-over switch of the frequency conversion power supply is always kept at 0 degree and 180 degree, and the positions are a voltage zero point where a sine wave is output; and during partial discharge measurement, the point can be shielded so that a measurement result is not influenced. The partial discharge signals can be continuously collected during alternating current voltage withstanding so that credibility and accuracy of partial discharge measuring signals are increased. Through continuous collection, a noise reduction effect of the partial discharge signals can be greatly increased so that fault positioning of a partial discharge point is easy and accurate.

The invention relates to a full-true partial discharge monitoring device for a switchgear. The full-true partial discharge monitoring device comprises a full-true partial discharge analysis system, asmart terminal and a full-true partial discharge monitoring instrument. The two ends of the full-true partial discharge monitoring instrument are in data connection with the smart terminal and the full-true partial discharge analysis system respectively. A lightning arrester connected to the switchgear is arranged at the full-true partial discharge monitoring instrument; and a pedestal connected with the switchgear is installed at the bottom of the lightning arrester. The smart terminal connected with the lightning arrester is arranged between a wiring terminal and the pedestal. One end of thesmart terminal is respectively connected with a casing pipe main capacitor and a signal collecting capacitor that are connected in series; and an access terminal of the casing pipe main capacitor anda connecting terminal of the signal collecting capacitor are connected with a high voltage end and a ground wire. The output terminal of the smart terminal is provided with signal cables connected with the full-true partial discharge monitoring instrument through a partial discharge signal port and a working frequency signal port. The device has the following beneficial effects: the partial discharge value of the switchgear is reflected truly; and synchronous partial discharge detection of multiple channels is realized and the detection precision is high.

The invention discloses a partial discharge detection system of a high-voltage DC gas-insulated combined electrical appliance, which includes a high-voltage DC voltage generation module, a data acquisition module and a host computer module. The high-voltage DC voltage generation module generates a high-voltage DC voltage and applies it to a gas-insulated combined electrical appliance to be tested. , the data acquisition module collects the high-voltage DC voltage signal generated by the high-voltage DC voltage generation module and the partial discharge signal generated by the gas-insulated combination device to be tested under the high-voltage DC voltage, and sends the collected signal to the host computer module, and the host computer module passes through The built-in high-voltage DC partial discharge analysis software analyzes the partial discharge characteristics; the whole system truly simulates the operating environment of the high-voltage DC gas-insulated combined electrical appliance to be tested, and detects partial discharge caused by insulation defects. The structure is simple and the operation is convenient. By detecting the partial discharge current pulse signal, Calculate the apparent discharge volume, determine the partial discharge risk factor, and realize the classification of insulation defects.