612results about "Testing circuits" patented technology

The invention discloses a GIS (Gas Insulated Switchgear) tiny defect detection method and system based on X-ray multi-effect fusion, and the method comprises the following steps: firstly, exciting a latent defect in a GIS to generate partial discharge by using an X-ray photoionization effect, detecting a discharge signal by using an ultrahigh frequency method and an ultrasonic method, and after the discharge signal is processed by a noise reduction model, carrying out noise reduction on the discharge signal; and respectively obtaining an ultrahigh-frequency discharge phase spectrogram and an ultrasonic discharge phase spectrogram. Then, the imaging plate is placed on the back face of the GIS, digital DR imaging is carried out through X rays, and an X-ray image is obtained; the ultrahigh frequency discharge phase spectrogram and the ultrasonic discharge phase spectrogram are fused after being denoised, an X-ray image is combined to establish a GIS health state diagnosis model, and reliable defect detection is carried out on the GIS according to the evaluation score of the diagnosis model. According to the method, multiple effects of X-rays are fused, so that smaller GIS latent defects can be found, the detection sensitivity is remarkably improved, and the problem that the traditional method is difficult to identify the tiny latent defects is solved.

The invention discloses an insulator pollution flashover monitoring device and method, and relates to the technical field of online monitoring and fault diagnosis of high-voltage power equipment. The monitoring unit comprises a fixing piece, a hanging piece arranged on the fixing piece, a swing arm rotationally arranged on the fixing piece and detection assemblies arranged on the swing arm at intervals in the length direction of the swing arm; the visual acquisition module is arranged on the unmanned aerial vehicle; the hanging piece is detachably connected with the unmanned aerial vehicle, the fixing piece is used for being detachably and fixedly connected with an insulator, the swing arm is in driving connection with a driving piece, the driving piece can drive the swing arm to swing around a first axis, and the first axis is perpendicular to a second axis of the insulator to be detected. The detection environment of the electric field probe is less affected by the surrounding insulator chain, so that the obtained monitoring data is more representative, and the monitoring result is more accurate.

The invention discloses a GIS ultrahigh frequency sensor ultrasonic cooperative detection system based on piezoelectric energization, and relates to the field of electric power detection, and the system comprises an excitation module which is used for transmitting a piezoelectric excitation signal with a specific frequency to a preset detection region in GIS equipment, so as to trigger the potential partial discharge acoustoelectric signal radiation of the region; the sensing module is used for receiving ultrahigh-frequency electromagnetic signals and ultrasonic vibration signals radiated by partial discharge in the GIS equipment; the excitation frequency, the filtering bandwidth and the sampling rate are dynamically optimized according to the detection result, the detection accuracy and efficiency are continuously improved, and reliable and effective guarantee is provided for safe operation and defect early warning of GIS equipment.

This application provides a power conversion apparatus and an insulation impedance detection method. The insulation impedance detection circuit is connected to the direct current bus and the ground, and the isolation switch is connected to the insulation impedance detection circuit and the alternating current voltage detection circuit. The controller is configured to control the isolation switch to be turned on, and control the insulation impedance detection circuit to detect a voltage between the direct current bus and the ground, to obtain an insulation impedance based on the voltage. The controller is further configured to control the isolation switch to be turned off before controlling the insulation impedance detection circuit to detect the voltage, to protect a person from suffering an electric shock and hand numbness due to touching the output end of the inverter circuit.

The invention relates to the technical field of control systems, and particularly discloses an intelligent control system for an insulation test of a marine dry-type transformer. The system comprises a high-voltage test power supply module, a multi-mode sensing acquisition module, an insulation state evaluation module, a self-adaptive boost decision module and a test process control module, and evaluates an insulation state and dynamically decides a boost rate and a holding strategy by acquiring voltage, leakage current, partial discharge and temperature data in real time. Intelligent control and safety protection in the insulation test process are achieved, potential insulation damage is effectively avoided, and diagnosis precision is improved.

The invention discloses a method for researching an external short-circuit current impact damage mechanism of a lithium ion battery, and the method comprises the steps: testing the limit short-circuit current of the battery through a fitting mode, and determining the time upper limit of short-circuit current impact through an uncontrolled time short-circuit experiment; millisecond-level short-circuit current impact tests of different time scales are carried out on the battery, and performance tests are carried out on the battery every N times of impact so as to monitor recession characteristics of parameters such as capacity and internal resistance of the battery; performing prediction and quantitative calculation on damage mechanisms such as positive and negative electrode active material loss and lithium ion loss by combining a capacity increment curve and an open-circuit voltage curve; and disassembling the battery in an inert gas atmosphere, carrying out microstructure, morphology and element distribution characterization on the electrode and the diaphragm, and verifying a damage mechanism. According to the method, electrochemical testing and material characterization are combined, the corresponding relation and evolution law of battery performance degradation and internal material damage under external short-circuit current impact are disclosed, and a basis is provided for safety design and reliability evaluation of a battery system.

A vehicle charging system for an electric vehicle includes a housing having a mating end for mating with a charging component and a charging terminal held by the housing connected to a power conductor to form a power transmission line. The vehicle charging system includes a charging controller for controlling vehicle charging along the power transmission line. The vehicle charging system includes a charging sensor assembly coupled to the charging controller monitoring charging status of the vehicle charging system and generating a charging output signal. The charging sensor assembly detects an arc signature from an arc event and generates an arc output signal. Based on the arc output signal, the charging controller generates a primary control output to perform a primary protective action including shutting down the charging operation and generates a secondary control output to perform a secondary protective action.

There is provided a circuit for monitoring an insulating property of a fuel cell stack, comprising: a low-frequency voltage source for negatively injecting a low-frequency signal only to a high-voltage bus of the fuel cell stack; a first resistor; and a second resistor; wherein the low-frequency voltage source, the first resistor and the second resistor are connected in series, and the low-frequency voltage source, the first resistor and the second resistor which are connected in series are connected with a high-voltage bus negative ground insulation resistor of the fuel cell stack in parallel; and the voltage on the first resistor can be measured so as to be used for determining the insulating property of the fuel cell stack. Therefore, the low-frequency voltage source only injects the low-frequency signal at the negative single side of the high-voltage bus, so that only the insulating property of the negative single side of the high-voltage bus is reduced, and the insulating property of the positive side of the high-voltage bus is not influenced.

The present disclosure provides an insulation detection apparatus and method, and an energy storage apparatus, and relates to the technical field of energy storage safety. The insulation detection apparatus includes: a coupling conductor and a signal acquisition unit, where the coupling conductor and the signal acquisition unit are electrically connected, the coupling conductor and the signal acquisition unit are used to form an insulation detection loop with a device under test, and the signal acquisition unit is further used to detect an electrical signal in the insulation detection loop. The coupling plate and signal acquisition unit used in the present disclosure have a simple structure and low cost. Compared with the existing insulation impedance detection, the present disclosure has a high detection sensitivity and more reliable detection result.

The invention discloses a transformer partial discharge positioning method and system, and the method comprises the steps: recording a first pulse signal through a high-frequency sensor, and recording a second pulse signal through at least three ultrasonic sensors; taking the time mark corresponding to the minimum energy accumulation value of the first pulse signal as a first arrival time, and correcting the first arrival time by using the time mark corresponding to the maximum amplitude value of the first pulse signal; taking the time mark corresponding to the minimum energy accumulation value of the second pulse signal as a second arrival time, and correcting the second arrival time by using the time mark corresponding to the maximum amplitude value of the second pulse signal; performing partial discharge positioning by using the coordinates of the at least three ultrasonic sensors, the corrected first arrival time and each corrected second arrival time to obtain a discharge point position; and correcting the position of the discharge point based on a clustering algorithm. According to the embodiment of the invention, the error of time delay can be reduced, the positioning position is corrected through the clustering algorithm, and the positioning accuracy is further improved.

The invention relates to the technical field of photoelectric tube detection, in particular to a photoelectric tube high-voltage excitation type solar blind ultraviolet discharge detection method and system, and the method comprises the steps: obtaining original voltage sequence data collected by a high-speed transimpedance sampling circuit in real time; positioning feature points of each suspected pulse according to the original voltage sequence data, and extracting pulse waveform features; obtaining a physical confidence factor of each suspected pulse according to the falling edge attenuation characteristics; calculating effective discharge energy flow in unit time based on the physical confidence factor; calculating a discharge stability coefficient according to a coupling relationship between the time correlation entropy and the effective discharge energy flow; according to the method, a scheme from microscopic physical judgment, waveform form deconstruction and time law analysis to multi-dimensional trend prediction is constructed, so that the contradiction between the detection sensitivity and the quantification precision is solved; and adaptive tracking monitoring of the partial discharge process is realized.

To provide an electric signal detector, a diagnosis device, a partial discharge detection system, a partial discharge detection method, and a program, which can detect occurrence of partial discharges with high accuracy.SOLUTION: An electric signal detector comprises: a first reception unit 12 for receiving an electric signal generated in a cubicle 4; a wide-band filter F0 for extracting an electric signal of a first frequency band from the received electric signal; a plurality of narrow-band filers F1-F3 for extracting an electric signal of a frequency band which is a portion of the first frequency band; a selection switch 14 for selecting the wide-band filter F0 and one of the narrow-band filters F1-F3; a level determination unit 20 for determining whether or not the level of the electric signal extracted by the wide-band filter F0 is greater than or equal to a threshold level; and a control unit 22 for sequentially selecting the narrow-band filters F1-F3 by switching the selection switch 14 when the electric signal level is determined to be higher than or equal to the threshold level, and transmitting the electric signals extracted by the narrow-band filters F1-F3 to the diagnosis device 3 that diagnoses occurrence of a partial discharge.SELECTED DRAWING: Figure 2

An insulation monitor for a high-voltage onboard electrical system of a motor vehicle is provided. A respective Y-capacitor is arranged between the positive potential and the vehicle earth and between the negative potential and the vehicle earth. The insulation monitor has a current or voltage source, a voltmeter for measuring at least one of the potentials, and is configured to apply a negative current by the current source when the potential measured by the voltmeter exceeds a predefined upper value and to apply a positive current by the current source when the potential measured by the voltmeter falls below a predefined lower value. The current thus being limited to a maximum permissible contact current in the case of an insulation fault and it is possible to infer the magnitude of the insulation resistances using the voltage measured by the voltmeter and the recharging current that has been fed in.

The invention belongs to the technical field of porcelain insulator zero-value detection, and discloses a porcelain insulator zero-value detection device and a detection method thereof, and the device is used for portable rapid zero-value detection or zero-value detection for early defective insulators / partially degraded insulators. The portable rapid zero value detection device comprises an impulse voltage generator, an insulator unit and a measurement module, the output end of the impulse voltage generator is connected with the input end of the insulator unit, and the output end of the insulator unit is connected with the measurement module; the device for detecting the zero value of the early defective insulator / the partially degraded insulator comprises an impulse voltage generator, a Rogowski coil, an integrator and an oscilloscope, the Rogowski coil is arranged on a wire to be detected in a surrounding mode, the output end of the Rogowski coil is connected into the integrator, and the output end of the integrator is connected with the oscilloscope. The invention provides a porcelain insulator zero value detection method taking a high-frequency component as a criterion, and the method can achieve the quick and reliable detection of whether the value of the insulator is zero or not.

Provided is an electric vehicle charger performance inspection system enabling inspection of the performance of a charger for charging an electric vehicle with a DC power source, comprising: a simulator generating a control signal for simulating a failure; a failure simulation module comprising a failure simulation circuit unit for causing switches to operate by the control signal generated, and an insulation failure simulation circuit unit for causing the switches to operate by the control signal of the simulator; a load module comprising a resistor load bank including multiple resistors connected to the DC power source, and switches operated by a signal of the simulator to cause the multiple resistors to be connected to or blocked from a DC power line; and a path switching main module wherein inlets having plugs of one or more types of chargers inserted thereinto, and a connector connected to the load module are installed.

The invention provides an insulation test auxiliary device and an insulation test system, and the auxiliary device comprises a positive electrode connection port, a negative electrode connection port, a plurality of test ports, a plurality of first switches, a plurality of second switches, and a control module. Wherein the plurality of first switches are respectively connected in series between the positive electrode connection port and the plurality of test ports, and the plurality of second switches are respectively connected in series between the negative electrode connection port and the plurality of test ports; and the control module is used for controlling the on-off of the plurality of first switches and the plurality of second switches, and carrying out an insulation test among the plurality of test targets by using the insulation resistance tester. According to the insulation test auxiliary device and the insulation test system disclosed by the invention, the insulation test among a plurality of test targets can be realized, so that a large number of wire disassembling and wiring processes are omitted, the efficiency of the insulation test is effectively improved, and the cost of the insulation test is reduced.

The invention relates to the technical field of electrical equipment insulation tests, and discloses a medium-voltage cable variable-frequency resonance voltage-withstanding test system and a medium-voltage cable variable-frequency resonance voltage-withstanding test method. The method comprises the steps of configuring a test loop and setting related parameters, and presetting a target test voltage, test time, a system quality factor range, a local discharge capacity threshold and a current change rate threshold based on a cable model, a cable length, a laying environment temperature and an equivalent capacitance. And executing frequency scanning in a preset frequency range through an adaptive step length strategy, adjusting the step length according to the current response, identifying the resonant frequency and verifying the quality factor of the system. In the test process, the loop current change rate, the partial discharge capacity and the equipment temperature are monitored in real time, a protection mechanism is triggered according to abnormal characteristics, and insulation state diagnosis is completed. When the test is ended, voltage is reduced at a controllable rate, residual charges are dissipated, and a test report is automatically generated. The method improves the accuracy and safety of the test, and is suitable for various field conditions.

The utility model provides a dielectric breakdown measurement circuit and a semiconductor detection device. The dielectric breakdown measurement circuit includes: an adjustable voltage source; the first end of the divider resistor is electrically connected with the adjustable voltage source, and the second end of the divider resistor serves as a voltage division output end; the tested circuit is electrically connected with the partial voltage output end; the input end of the detection circuit is electrically coupled to the voltage division output end, and the detection circuit is configured to convert a signal of the voltage division output end into a detection signal. In the breakdown process of the to-be-detected wafer, the change condition of the signal of the partial pressure output end is detected so as to reflect the breakdown degree of the to-be-detected wafer at any time, intermittent dielectric breakdown of the wafer can be prevented, electric breakdown and overlong detection time are further prevented, and the electric breakdown efficiency, the wafer electrostatic discharge efficiency and / or the wafer detection efficiency are remarkably improved. The voltage provided by the adjustable voltage source can also be used as a breakdown voltage, so that an extra electric breakdown circuit is not independently provided for the wafer to be tested.

The application discloses a local discharge signal processing method and device under high-frequency square wave voltage, wherein the method comprises the following steps: filtering low-frequency noise signals of a test power supply by using a high-pass filter with a preset cutoff frequency, wherein the test power supply is a high-frequency square wave power supply for local discharge test of an insulation sample; obtaining a local discharge starting voltage of the insulation sample, collecting a local discharge signal when a test voltage is the local discharge starting voltage, obtaining a characteristic frequency band of local discharge of the insulation sample according to the local discharge signal, and the test voltage is a high-frequency square wave voltage of the test power supply; performing modal decomposition on the local discharge signal of the characteristic frequency band to obtain a plurality of modal components, selecting a plurality of modal components satisfying a preset condition to perform noise reduction processing and signal reconstruction, and obtaining a denoised local discharge signal of the insulation sample under the high-frequency square wave voltage. The application can avoid interference of the high-frequency square wave power supply on the local discharge signal, and obtain a local discharge signal with high signal-to-noise ratio under the high-frequency square wave voltage.

The application provides a double-end optical lightning stroke positioning method and system applied to power overhead optical cables, and relates to the technical field of optical fiber sensing; the basic principle of positioning is to realize single-end lightning stroke positioning based on the obvious change of the polarization state of optical signals after the optical signals encounter lightning strokes; the application first uses counter-transmitted pulse polarized light to detect a single-end lightning stroke positioning point, then establishes a double-end positioning equation set to solve an actual lightning stroke positioning point, so that accurate lightning stroke positioning is realized; the application uses the Faraday optical rotation effect of lightning strokes on optical signals to realize lightning stroke positioning based on a polarized light time domain reflectometer; compared with traditional lightning stroke positioning, the application has low operation and maintenance cost, high precision, does not need wide-area accurate time synchronization, has a simple system, is convenient to install, and reduces the blind area of lightning stroke positioning.

A DC power system (1a, 1b, 1c, 1d, 1e, 1f) and an insulation resistance monitor device (14) thereof are provided. The DC power system (1a, 1b, 1c, 1d, 1e, 1f) includes positive, neutral and negative lines (11, 12, 13), a protective earthing terminal (PE) and a grounding resistor (Rgnd). The grounding resistor (Rgnd) is electrically connected between the neutral line (12) and the protective earthing terminal (PE). The insulation resistance monitor device (14) includes a first resistor (R1), a first sensing resistor (Rs) and a first detection circuit (141). The first resistor (R1) is coupled to the positive or negative line (11, 13). The first sensing resistor (R1) is coupled between a second terminal of the first resistor (R1) and the protective earthing terminal (PE). The first detection circuit (141) is electrically connected to the first sensing resistor (Rs), and is configured to measure a sensing voltage across the first sensing resistor (Rs) and detect whether an insulation resistance between the protective earthing terminal (PE) and any of the positive, neutral and negative lines (11, 12, 13) is abnormal according to the sensing voltage.

The invention discloses an electric reactor transient arc detection method, device and equipment and a medium. The method comprises the steps that an optical signal, an acoustic signal and an electromagnetic pulse signal in an electric reactor oil tank are collected in real time; arc fault diagnosis is carried out based on the optical signal, the sound signal and the electromagnetic pulse signal, and a diagnosis result is obtained; and executing a protection action based on the diagnosis result. According to the invention, multi-parameter signal synchronous monitoring can be realized, and the risk of missing report caused by limitation of a single signal is reduced; in addition, the characteristics of the electric arc in the oil are used as a criterion, so that the probability of false alarm and missing alarm is reduced.

This invention discloses a live-line detection device and method for partial discharge in GIS (Gas Insulation System), relating to the field of live-line detection of power equipment. The equivalent capacitance between the primary and secondary windings of a current transformer coil is used as a pulse signal coupling channel. Two sets of pulse current signals within the high-voltage conductor of the GIS are acquired through these two pulse signal coupling channels. Then, the partial discharge voltage signal of a specified frequency is extracted through a pulse partial discharge detection circuit. The two extracted pulse signals are output to a differential mode comparison and acquisition module. This module compares the pulse signals input from the two channels, effectively eliminating interference signals. This invention simultaneously solves two problems in GIS live-line partial discharge pulse detection: pulse coupling and high-voltage side partial discharge interference during live operation. It achieves accurate detection of partial discharge during GIS operation, ensuring the safe and stable operation of GIS electrical equipment.

A method and system for monitoring an insulation resistance (IR) of an electric machine, the system including a bridge circuit arrangement. A voltage on the bridge circuit arrangement is detected. The IR is calculated as a resistance in the bridge circuit arrangement associated with the detected voltage.

The invention provides an insulation space charge low-voltage side acquisition system under positive polarity square waves. The insulation space charge low-voltage side acquisition system comprises a signal generation unit, a voltage amplification unit, a current-limiting protection resistor, a high-voltage test branch, a signal acquisition unit, an optical fiber communication module and an upper computer, wherein the high-voltage test branch is formed by connecting a tested sample and an integrating capacitor in series; the signal acquisition unit and the optical fiber communication module are integrated on a PCB (Printed Circuit Board); according to the system, a signal generation unit and a voltage amplification unit cooperatively generate repeated square wave high voltage and apply the high voltage to a sample, a signal acquisition unit on a low-voltage side is used for extracting an analog voltage signal on an integrating capacitor, the analog voltage signal is converted into a digital signal and then is transmitted to an upper computer through optical fiber isolation, and a dynamic charge quantity waveform is obtained. The device can accurately measure the charge accumulation characteristics of the insulating material or the structure under the repeated square wave voltage, effectively evaluates the insulating performance and the deterioration degree of the sample, and has the advantages of high measurement precision, good safety, high integration level and the like.

The present invention provides a power device breakdown voltage parameter testing system and method, wherein a control module is respectively connected to a high-voltage power supply module, a current regulation module, a digital-to-analog conversion module, and an acquisition card; the digital-to-analog conversion module is connected to the current regulation module; the positive terminal of the high-voltage power supply module is connected to the first terminal of the current regulation module, the negative terminal of the high-voltage power supply module is connected to the emitter of the IGBT to be tested, and the second terminal of the current regulation module is connected to the collector of the IGBT to be tested; the acquisition card is connected to the data acquisition module, the data acquisition module is also connected to the collector and emitter of the IGBT to be tested, and the acquisition card is also used to connect to a host computer. By changing the current setting conditions, the current in the power supply circuit of the IGBT to be tested can be correspondingly adjusted, thereby completing the breakdown voltage test under a high-voltage and set current value environment, meeting the needs of testing the breakdown voltage parameters of the IGBT in various test scenarios.

The invention provides an alternating current arc detection method and a related device, and the method comprises the steps: obtaining an external instruction through a controller of an arc detection system, and determining a circuit simulation model based on the external instruction; acquiring a first current signal from the signal detection circuit module in the detection period, and determining an arc feature vector based on the first current signal; determining an arc generation condition based on the arc time-frequency feature vector; generating an arc generation image based on the arc generation condition and the circuit simulation model; a multi-stage circuit regulation and control strategy is determined based on the arc generation condition, and a regulation and control circuit module is regulated and controlled based on the multi-stage circuit regulation and control strategy; acquiring a second current signal; determining an arc suppression effect image based on the second current signal and a circuit simulation model; therefore, the arc generation condition and the suppression effect can be visualized in real time, the arc suppression efficiency is improved, the arc analysis accuracy is improved, the arc extinguishing time is shortened, and then the alternating current arc detection efficiency, the detection precision and the arc suppression speed are improved.

A computer system comprising processing circuitry is provided. The computer system is configured to obtain a chassis voltage between a first traction voltage pole and a chassis of a vehicle; obtain a scheduled switching time to switch from the first traction voltage pole to the second traction voltage pole in order to measure the chassis voltage between the second traction voltage pole and the chassis of the vehicle; determine a disturbance on the first or second voltage pole; adjust the scheduled switching time and / or a corrective algorithm; and obtain a chassis voltage between the second traction voltage pole and the chassis of the vehicle based on the adjusted scheduled switching time and / or the corrective algorithm.

A system (2) for detecting insulation defects in an underground power cable (12) having one or more single conductors (16, 18, 20) surrounded by a conductive shield (22). The system (2) includes one or more external clamp-on sensors (4, 4', 4'', 4''') fastened to the outside of the power cable (12) or positioned in close proximity to the power cable (12). The clamp-on sensors (4, 4', 4'', 4''') are configured to provide two or more current measurements from outside the power cable (12) without being electrically connected to any of the one or more conductors (16, 18, 20) of the power cable (12). The system (2) includes a signal processing unit (50). The sensors (4, 4', 4'', 4''') are configured to detect partial discharge events (6, 6', 6'', 6''', 6''''). The signal processing unit (50) is adapted to use a mathematical statistical model (52) to process the measurements obtained by the sensors (4, 4', 4'', 4''') to identify whether the current measurements are caused by a partial discharge event (6, 6', 6'', 6''', 6'''') caused in a leakage structure (46) of the power cable (12).