40results about "Impedence measurements" patented technology

A ground fault detection apparatus is configured to perform a detection for a decrease in an insulation resistance in a measurement cycle in which a fluctuation of a second charging voltage as a charging voltage of a first capacitor that is charged in a second charging route in which the first capacitor is connected between a cathode of the battery and the ground is determined to be less than a second threshold value, and a fluctuation of a third charging voltage as the charging voltage of the first capacitor that is charged in a third charging route in which the first capacitor is connected between an anode of the battery and the ground is determined to be less than a third threshold value.

A battery module failure is reliably determined. A power supply device is provided with: a plurality of battery modules (2) including a failure determination section (21) that determines failure and normality and outputs failure and normality using signals of "high" and "low"; a failure transmission line (3) connected to the failure determination section (21) of each battery module (2); and a module failure determination circuit (1) connected to the failure transmission line (3) and determining failure and normality of the battery modules (2). The module failure determination circuit (1) is provided with: a voltage determination circuit (4) that determines "high" and "low" of the failure transmission line (3); an impedance detection circuit (5) that detects impedance with respect to a ground line (23); and an arithmetic circuit (6) that determines failure and normality of the battery modules (2) and abnormality of the failure transmission line (3) based on outputs of the voltage determination circuit (4) and the impedance detection circuit (5).

Disclosed herein is an apparatus for measuring physical properties of hairpin coils, which includes a current sensor configured to apply a current for each frequency to a material of a hairpin coil to measure an induced current applied to the material, and a measurement processor configured to measure physical properties of the material by measuring an impedance of the material with the induced current measured by the current sensor and applying the impedance to a model established in the material.

The application relates to the technical field of buried pipeline fault diagnosis, and discloses a buried pipeline insulation fault intelligent diagnosis method, device, system and medium, which firstly constructs a buried pipeline distributed parameter equivalent circuit model in a Simulink environment, acquires multi-condition pipeline voltage signal data by setting different operation conditions; secondly, a fault diagnosis model containing a feature extraction module, an attention enhancement module and a classification prediction module is constructed, voltage signal features are extracted by using a multi-scale convolution network, and key feature expression is strengthened through an attention mechanism; meanwhile, a category conditional contrast constraint is introduced, alignment of the same features under different conditions is realized, and the adaptability of the model to unknown conditions is improved; finally, the to-be-tested voltage signal is input into the model, and intelligent positioning of the pipeline insulation fault position or category is realized. The application can realize high-robustness fault recognition under complex conditions, and has good engineering application value.

The invention relates to a traction network for a motor vehicle, comprising a high-voltage battery, having a first measuring device for detecting the voltage of the high-voltage battery, a measuring device for detecting the voltage between a positive high-voltage line and ground and a further measuring device for detecting the voltage between a negative high-voltage line and ground, the insulation resistance between the positive high-voltage line and ground being equal to the insulation resistance between the negative high-voltage line and ground or being balanced by a separate balancing resistor, the traction network further having a measuring resistor which is connected to the positive high-voltage line by means of a first switching element and to the negative high-voltage line by means of a second switching element, the traction network further having an insulation monitor device which is designed to carry out an insulation monitoring by comparing the voltage between the positive high-voltage line and ground with the voltage between the negative high-voltage line and ground in the vehicle stationary state, to calculate the insulation resistance in the driving operation by closing one of the first switching element and the second switching element, respectively, and to a method for insulation monitoring.

A method, device, system, and storage medium for insulation impedance detection are provided. The method includes: determining a preliminary inspection insulation impedance of each of the power supply units; determining a preliminary inspection insulation impedance that meets a preset condition as a target insulation impedance based on the preliminary inspection insulation impedance of each of the power supply units; determining an insulation inspection compensation coefficient based on the target insulation impedance and initial impedances of the plurality of power supply units; and determining a secondary inspection insulation impedance of a target power supply unit based on the insulation inspection compensation coefficient.

The application discloses a high-voltage cable metal sheath loop resistance time-frequency domain dual-mode live detection method, comprising the following steps: S1. generating a multi-frequency band composite excitation signal containing a low frequency band, a medium frequency band and a high frequency band; S2. injecting the multi-frequency band composite excitation signal into a high-voltage cable metal sheath loop in operation and synchronously collecting time domain response signals and frequency domain response signals; S3. extracting time-frequency domain characteristic parameters according to the time domain response signals and the frequency domain response signals; and S4. inputting the time-frequency domain characteristic parameters into a preset defect diagnosis model to output a defect type and a defect degree of the high-voltage cable metal sheath. The application breaks through the limitation of single frequency detection, establishes the correlation between impedance-frequency and impedance-time domain characteristic curves, and significantly improves the defect recognition accuracy and positioning precision.

An electric wire inspection system and method that can sensitively detect damage on an electric wire, and an electric wire capable of being inspected using the same. The electric wire inspection system includes: an inspection unit which performs electric wire inspection wherein a characteristic impedance between two conductive members of the electric wire is obtained as a response signal by time domain or frequency domain reflectometry; a storage unit which stores the response signal obtained at a first time point; and an analysis unit which retrieves the response signal obtained at the first time point from the storage unit, compares it with the response signal obtained at a second time point later than the first time point, and, if a difference exists between the two response signals, correlates a region in which the difference exists in the response signals with a position along an axial direction of the electric wire.

A time domain reflectometry (TDR) controlled-impedance testing system includes one or more ultra-low impedance testing channels (e.g., having a characteristic impedance of less than 10 ohms, or less than 5 ohms, or less than 2 ohms) to couple a test signal to a test target ("device under test"). In one example, the TDR testing system includes one or more printed circuit boards (PCBs) on which at least a portion of the testing channel is implemented. The PCB includes an ultra-wide impedance-controlled trace and one or more return conductors constituting at least a portion of an ultra-low impedance PCB RF transmission line having a characteristic impedance of less than 10 ohms (or less than 5 ohms, or less than 2 ohms).

The technology may inject, at one or more stimulus source nodes, an active small-signal electrical stimulus. The technology may detect stimulus-correlated responses at a plurality of measurement nodes of the network. The technology may estimate at least one model parameter indicative of the network structure or impedance based at least in part on the detected stimulus-correlated responses.

To provide a system and method for isolation resistance measurement.SOLUTION: A system includes a processing device and a measurement circuit coupled to the processing device. The system further includes an auxiliary voltage supply. The processing device and the measurement circuit are powered by the auxiliary voltage supply. The measurement circuit is to apply a test voltage to a first resistor and measure a voltage drop over the first resistor. The processing device is configured to determine, based on at least the voltage drop, an isolation resistance value between a chassis ground node and at least one of a battery pack or a battery link of a power system.SELECTED DRAWING: None

According to various embodiments of the present invention, an insulation monitoring device includes an impedance disposed between a power line and a system ground. The insulation monitoring device includes: a signal generation circuit for applying a triangular wave signal to the power line via a signal measurement circuit; a signal measurement circuit for measuring a voltage difference across a detection resistor or a current flowing through the detection resistor when the triangular wave signal is applied to the impedance; and a control circuit for acquiring an impedance value of the impedance based on at least one of the voltage difference and the current, and monitoring the impedance value.

The invention relates to a flexible and simple method for testing an earthing system (1), in which method: a test alternating current (iAC) is introduced into the earthing system (1); an initial electrical voltage (Ue) between the earthing system (1) and an initial measuring position (A-1) in the earthing region (EB) is measured; an electrical section voltage (Ua,1) between a first section measuring position (A-1) in the earthing region (EB) and a second section measuring position (A-2) in the earthing region (EB) is measured; an initial phase relationship between the initial voltage (Ue) and the test alternating current (iAC) is established; a section phase relationship between the at least one section voltage (Ua,1) and the test alternating current (iAC) is established; and a value of the description parameter (ZE) is determined from the test alternating current (iAC), the initial voltage (Ue), the at least one section voltage (Ua,1), the initial phase relationship and the section phase relationship.

A ground impedance detection device, method and inverter. The detection device comprises a signal source, a coupling impedance network, a voltage dividing network, a sampling module and a controller; the signal source is used to provide an excitation signal; the coupling impedance network is connected with the signal source and used to couple the excitation signal between the DC input end and the AC output end of the inverter; the voltage dividing network is used to divide the voltage between the DC input end and the AC output end to provide a divided voltage; the sampling module is connected with the voltage dividing network and used to sample the divided voltage to obtain a sampling voltage; the controller is connected with the signal source and the sampling module respectively and used to control the signal source to provide at least one excitation signal and obtain the ground impedance of the DC input end of the inverter according to the at least one excitation signal and the corresponding sampling voltage under the at least one excitation signal.

A method and device for insulation monitoring and insulation fault location in an unearthed power supply network operate without a testing current generator by using an insulation monitoring device to generate a permanent measuring voltage between a mains conductor and earth and to feed a measuring current into the network. Measuring currents are detected using at least one current transformer arranged at each mains outgoing circuit, and total measuring current and proportional measuring currents in the mains outgoing circuits are determined and evaluated such that the measuring current used for insulation monitoring of the overall network is also used for insulation fault location in individual circuits. From a time variation of each circuit measuring current and the measuring voltage, an ohmic insulation resistance and a capacitive reactance (and / or impedance) are determined and analyzed for each mains outgoing circuit.

The invention relates to a method for determining an insulation resistance (R1, R2) and a discharge capacitance (C1, C2) to earth (PE) of an unearthed DC power supply system, wherein a linear differential equation is implemented with a measured voltage (UM(k)) as a function of the measurement voltage (UG(k)) and the grid voltage (UN(k)) and with grid parameters (θi) formed from the shunts (RM), from the insulation resistances (R1, R2) to be determined and from the discharge capacitances (C1, C2) to be determined. N linear differential equations are used to implement (S5) a measured value equation system with the sample sequences (UG(k), UN(k), UM(k)) and the grid parameters (θi) for k=1, 2 to N measurement times with the sampling period T. The other method steps comprise computing (S6) estimated grid parameters (θi) as an approximation solution for the measured value equation system, a sum of the square errors between the grid parameters (I) and the estimated grid parameters (θi) being minimized, minimizing (S7) the sum of the square errors by way of QR breakdown of a measured value matrix (Ψ), the QR breakdown being computed recursively, computing (S8) the respective insulation resistance (R1, R2) and the respective discharge capacitance (C1, C2) from the estimated grid parameters (I) and continually repeating the method steps with the respective computed, estimated grid parameters (I) to incorporate the samples available for the present measurement time.

This application discloses a resistance detection method and a resistance detection circuit. A test voltage and a reference voltage are obtained, and one of them is set as a value-to-be-compared and the other one is set as a reference value with a fixed value. The test voltage is a voltage value obtained by applying a test current to a unit-under-test, and the reference voltage is a voltage value generated by a reference voltage supply circuit. The value-to-be-compared includes a first boundary value and a second boundary value. The first boundary value and the second boundary value are compared with the reference value respectively to obtain a first comparison result and a second comparison result. A resistance range of a resistance of the unit-under-test is calculated based on the first comparison result and the second comparison result.

The invention relates to a method for estimating the aging state of a battery device (1), in particular for a vehicle battery, especially of an electrically powered motor vehicle (2), with a battery device (1), wherein the battery device (1) is connected to a high-voltage network (5) and at least the insulation resistance (6, 7) between a positive high-voltage voltage and GND and / or between a negative high-voltage voltage and GND is measured, wherein the aging state of the battery device (1) is estimated from the result of the measurement or from the results of the measurements taken.

The present invention relates to an energy storage system (10) and an insulation monitoring method (S300) for the energy storage system (10). The energy storage system (10) includes a plurality of battery racks (100), each including a plurality of batteries and connected in parallel to one another, a power conversion device (110) connected to the plurality of battery racks (100) to convert power, a main switch (130) configured to turn on and off a current flow between the plurality of battery racks (100) and the power conversion device (110), a first insulation monitoring device (140) and a second insulation monitoring device (142) each connected to respective terminals of the main switch (130), and a controller (120) configured to control operations of the main switch (130), the first insulation monitoring device (140), and the second insulation monitoring device (142). The first insulation monitoring device (140) monitors insulation information regarding the power conversion device (110), and the second insulation monitoring device (142) monitors insulation information regarding the plurality of battery racks (100).

A system for monitoring cables is disclosed. The system nay include: a coupler for coupling high-frequency EM energy with high or medium voltage cables, comprising: a ferrite clamp comprising a ferromagnetic non-conductive material capable of signal impeding and configured to encompass a grounding wire of a shielded cable; a first sensing connector, and a second sensing connector; and a transceiver connected to the first sensing connector and the second sensing connector and configured to be connected to one or more monitoring systems.

Aspects of the disclosure provide a circuit (102). In at least some instances, the circuit includes a dual-role port (124) for transferring power to and from the circuit. The circuit also includes a micro-processing unit (114). The micro-processing unit is configured to control the circuit to operate as a sink device to receive power from a source device via the dual-role port when a power supply includes a first amount of stored energy, detect a change in a termination resistance of the source device at the dual-role port, and control the circuit to limit the transfer of power from the circuit to the power supply via the dual-role port when the power supply changes a state from a supply state to a sink state.

The application discloses a kind of high-voltage cable metal sheath dynamic resistance diagnostic methods based on multi-physical field coupling, comprising the following steps: injecting alternating current signal to the metal sheath loop of high-voltage cable, the current amplitude and the voltage drop of sheath loop of injection are collected, and the original resistance value is calculated according to current amplitude and voltage drop;While injecting alternating current signal, the real-time temperature T of metal sheath and the vibration acceleration signal reflecting the mechanical vibration of metal sheath are collected;The vibration acceleration signal collected is processed, and the displacement variation ΔL of metal sheath is obtained, and the sheath deformation rate is calculated;Original resistance value, real-time temperature T and sheath deformation rate are substituted into the dynamic correction model constructed in advance, and the corrected resistance value is calculated.The application has the advantages of accurate resistance diagnosis.

The utility model relates to a kind of station monitor of self-adapting passage, including body, product external interface is equipped on body, controller, high resistance test module, low resistance test module and switching circuit are equipped in body, product external interface and switching circuit are connected with controller electric signal, passage identification module is equipped on controller, passage identification module is used to identify the category of the product connected on product external interface, high resistance test module and low resistance test module are used to monitor the ground resistance of the product connected, switching circuit is used to select the ground resistance of the product by high resistance test module or low resistance test module according to the product category identified.The utility model automatically identifies the interface category used by the product accessed to passage, automatically identifies product type, and can use high resistance test module or low resistance test module to adaptively monitor product, can effectively avoid passage idle, improve monitoring efficiency;Without frequently replacing hardware module, can reduce the complexity and cost of field implementation.

The front-end circuit for an impedance measurement comprises an excitation-terminal, intended to receive an excitation signal relative to a common ground, a first and a second input-terminal, intended to be connected to two electrodes, a first and a second output-terminal, whereby each one of the two output-terminals is intended to provide a measurement signal during a use of the front-end circuit in a measurement, preferably to an analogue to digital converter device; a first and a second mode selection-switch-unit, each with two mode switch-inputs, an operational amplifier and a reference resistor. During a measurement and depending on the state of the mode selection-switch-units, a feedback-loop of the operational amplifier comprises either a sample arranged between the two input-terminals or the reference resistor.

The present invention relates to a method for monitoring an insulation state in an electrical network, wherein the electrical network comprises a DC voltage source (U), and wherein the method comprises the following steps: - Generation of first charging processes in the electrical network between a ground potential (GND) and a positive potential (HV+) of the DC voltage source (U) and of second charging processes between the ground potential (GND) and the negative potential (HV-) of the DC voltage source (U); - Measurement of a first voltage profile (3) between the ground potential (GND) and the positive potential (HV+) of the DC voltage source (U) and a second voltage profile (4) between the ground potential (GND) and the negative potential (HV-) of the DC voltage source (U) during the charging processes; - Monitoring of the insulation state using the first voltage waveform (3) and the second voltage waveform (4); characterized by - Adjusting the time period allocated for the transshipment processes to changing conditions in the electrical network.

This disclosure provides an interconnect structure impedance measurement circuit. By optimizing the Wheatstone bridge structure, it employs three parallel branches. In one branch, the interconnect structure to be measured is connected in series. In the other two branches, two resistors are connected in series. By controlling the branch containing the interconnect structure and one of the other two branches to be simultaneously turned on, the voltage between the two turned-on branches is measured. The impedance of the two interconnect structures is calculated based on the current flowing into the interconnect structure impedance measurement circuit, the measured voltage, and the resistance in the branches. This disclosure allows for convenient, large-scale, and accurate measurement of interconnect structure impedance, and enables real-time and accurate monitoring of the impedance of a single interconnect structure in reliability experiments. This disclosure also provides an interconnect structure impedance measurement device and method.

This invention provides a leakage current detection circuit that can use zero potential as the positive electrode reference for a battery. [Solution] A leakage current detection circuit 10 for detecting leakage current from a battery having a first electrode and a second electrode of opposite polarity to a chassis, comprising a detection circuit 5a having a reference voltage source terminal VR, a first detection terminal In1, and a ground terminal GND connected to the first electrode, a first resistor 21 (or 28) connected between the second electrode and the chassis, a second resistor 22 (or 27) connected between the chassis and the first detection terminal In1, and a third resistor 23 (or 26) connected between the first detection terminal In1 and a predetermined terminal, wherein when the polarity of the first electrode is positive, the predetermined terminal is the reference voltage source terminal VR, and the detection circuit 5a detects the presence or absence of leakage current based on the voltage of the first detection terminal In1.