362results about "Testing circuits" patented technology

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.

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 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.

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.

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.

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).

The invention relates to the technical field of photovoltaic system insulation detection, in particular to a photovoltaic system grid-connected safety insulation test system and method, and the system comprises a data processing module, a sensing detection module, a control module and an alarm module. The method comprises the steps of presetting a safety threshold parameter and loading the safety threshold parameter to a system, and determining a diagnosis evaluation triggering condition based on the safety threshold parameter; calculating an insulation resistance value based on the collected data, and comparing the insulation resistance value with a safety threshold parameter to carry out an insulation test before grid connection; and collecting electric energy data in grid-connected operation of the photovoltaic system based on a test period, carrying out insulation detection after grid connection, and carrying out insulation state depth test and fault location based on a diagnosis evaluation trigger condition. The early degradation trend can be identified before an insulation fault occurs, and real-time monitoring of the insulation state of the photovoltaic system and early warning of the early degradation trend are realized.

This invention provides an insulation testing system and method for GIS (Gas Insulated Switchgear) and plug-in transformers that does not require disassembly, relating to the field of high-voltage electrical equipment testing technology. It aims to solve the technical problems of traditional plug-in transformer insulation testing, which requires disassembling the high-voltage side plug-in connector, leading to complex operation, high cost, slow response, and safety hazards. This invention establishes a test channel by reconstructing the grounding circuit of the GIS equipment. The GIS side grounding switch is closed, the grounding connector of the transformer side grounding switch is removed, and its exposed leads are used as test access points. Combined with dedicated test wiring components and insulation testing instruments, a complete electrical circuit covering transformer insulation testing is constructed. This invention eliminates the need to disassemble the plug-in connector, saving disassembly time. The test data error rate compared to traditional disassembly tests is ≤1.8%, eliminating the risk of SF6 gas leakage caused by repeated disassembly and assembly. It is suitable for preventative testing and fault diagnosis of fully enclosed insulated transformers in power systems.

The utility model discloses an insulation detection circuit and device based on unbalanced bridge mode, insulation detection circuit includes power, upper bridge arm, lower bridge arm and the first switch of connecting between upper bridge arm and lower bridge arm, one end of upper bridge arm is connected with the positive pole of power, one end of lower bridge arm is connected with the negative pole of power, and upper bridge arm includes first resistance to be measured, second switch and first voltage dividing resistance, and lower bridge arm includes second resistance to be measured, third switch and third voltage dividing resistance. The efficient, stable, sensitive insulation detection scheme based on unbalanced electric bridge mode of the application can monitor the insulation state of electrical equipment under complex environment in real time, and through effective signal processing, the safety and reliability of equipment are improved.

A computer system comprising processing circuitry is provided. The computer system is configured to: obtain a chassis voltage (V1) between a first traction voltage pole (A) and a chassis (P) of a vehicle (1); obtain a scheduled switching time (Ts) to switch from the first traction voltage pole (A) to the second traction voltage pole (B) in order to measure the chassis voltage (V2) between the second traction voltage pole (B) and the chassis (P) of the vehicle (1); determine a disturbance on the first or second voltage pole; adjust the scheduled switching time (Ts) and / or a corrective algorithm; and obtain a chassis voltage (V2) between the second traction voltage pole (B) and the chassis (P) of the vehicle (1) based on the adjusted scheduled switching time (Ts) and / or the corrective algorithm.

An arc detection method and system. The method includes: a station end device detects an arc by means of a first arc detection model, and uploads an arc detection sample to a model training device to update an original arc detection sample in the model training device; the model training device retrains a second arc detection model according to the updated arc detection sample to obtain an updated second arc detection model; and the model training device updates the first arc detection model according to the updated second arc detection model. According to the method, models are respectively trained for different application scenes; in this way, the fault tolerance rate and universality requirement of arc detection can be met, and the sensitivity requirement of arc detection can also be met.

The present application belongs to the technical field of partial discharge detection, and particularly relates to an interference generating device and method for simulating the influence of IGBT on partial discharge detection. In view of the deficiency in the prior art that there is no device specially used for studying the influence of electromagnetic interference generated by the high-frequency switching process of IGBT on the partial discharge detection of flexible HVDC converter transformers, the present application adopts the following technical scheme: the interference generating device for simulating the influence of IGBT on partial discharge detection in a converter transformer comprises: an IGBT module for generating a switching frequency interference signal of IGBT; a partial discharge defect module for simulating a mixed signal of a partial discharge signal and a white noise signal; a filtering module for filtering the simulated signal formed by superposition; and a high-frequency sensor for collecting and processing the filtered signal to obtain an analog measurement value of partial discharge. The present application has the beneficial effects of: constructing a brand-new interference generating device; and simulating the actual working condition of the IGBT of a converter transformer through the on-off of IGBT, which is more accurate.

The utility model discloses a high-efficiency low-cost high-voltage ignition detection circuit, which belongs to the technical field of high-voltage power supply electronics and comprises a high-voltage current detection resistor, a piezoresistor, a filter capacitor, a blocking capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first triode and a second triode. By means of the mode, faults such as electric field ignition and arcing can be found rapidly, meanwhile, the method is suitable for ignition detection of power supplies with different power sizes, positive and negative high-voltage power supplies can conduct effective ignition detection, and the anti-interference capacity is high.

A method for detecting an insulation fault in an unearthed electrical system, the system comprising a first rail and a second rail, each rail having an insulation resistance. The method comprises, in an initial stage: connecting the first rail to a relative ground through a first resistive component, wherein the first rail has an initial stage first rail voltage in the initial stage; and charging a capacitor to a capacitor voltage using the first rail, wherein the capacitor voltage is indicative of the initial stage first rail voltage. In a subsequent stage: connecting the second rail to the relative ground through a second resistive component; wherein the first rail has a subsequent stage first rail voltage; and determining if a fault has occurred by using the capacitor voltage and the subsequent stage first rail voltage.

A vehicle includes a battery pack configured to be charged with charging power which is DC power from a charger, a voltage sensor that detects a charging voltage of charging power, a switching device configured to switch between charging schemes different in charging voltage, and a vehicle controller that determines a charging scheme. The vehicle controller obtains from the voltage sensor, an insulation diagnosis voltage applied by the charger and determines the charging scheme based on the insulation diagnosis voltage.

A holiday detector system can include a holiday detector with a housing for holiday inspection circuitry to perform holiday inspection on a surface, a probe extending from the housing for surface inspection, the probe electrically coupled to the holiday inspection circuitry. The holiday detector system can also include a graphical user interface device electrically connected to the holiday detector. The graphical user interface device has a display screen and logic and circuitry to receive holiday inspection signals from the holiday detector apparatus; generate digital data representative of the holiday inspection signals; format the digital data into a graphical representation of the holiday inspection signals; display the graphical representation of the holiday inspection signals on the display screen; and digitally store the digital data in a data storage device. The holiday detector can communicate holiday inspection signals with the graphical user interface by a peripheral device interface, including an audio jack.

The invention discloses an insulating part interface defect detection method and device and electronic equipment, and the detection method comprises the following steps: S1, applying mechanical stress, thermal stress and electric stress to an interface area of a test sample at the same time, so as to couple and excite measurable response related to the interface defect; s2, synchronously monitoring response signals of at least two different physical properties caused by the interface defects while applying the multiple stresses; s3, identifying and / or positioning the interface defect based on the characteristics of the at least two response signals and the relevance of the at least two response signals in time and space; wherein the loading parameters of at least two of the mechanical stress, the thermal stress and the electric stress are subjected to closed-loop adjustment on the basis of each other, so that high-sensitivity and high-reliability identification and accurate positioning of tiny and hidden interface defects which are difficult to identify by a traditional method can be realized; and the accuracy and comprehensiveness of state detection of the insulating part are effectively improved.

A marine propulsion system for propelling a marine vessel includes at least a first marine drive system comprising a first electric marine drive powered by a first power storage system and a second marine drive system comprising a second electric marine drive powered by a second power storage system, a first isolation monitor configured to conduct first isolation testing to test electrical isolation of the first marine drive system, and a second isolation monitor configured to conduct second isolation testing to test electrical isolation of the second marine drive system. The first isolation monitor and the second isolation monitor are communicatively connected, wherein the first isolation monitor and the second isolation monitor are configured to communicate such that the first isolation testing and the second isolation testing are performed sequentially, one at a time.