97 results about "Impulse testing" patented technology

An electronic energy meter senses input voltage and current signals and processes the input voltage and current signals to generate measurements of multiple types of power. The meter comprises a processing system for selecting one of the multiple types of power and defining the same as the selected type of power. The processing system also generates a pulsed test signal representative of a magnitude of a measurement of the selected type of power for testing the operation of the meter. The meter further comprises a communications interface coupled to the processing system for transmitting the pulsed test signal from the meter and for receiving signals from sources external to the meter. Selection of one of the multiple types of power can be achieved by the meter receiving, via the communications interface and from a source external to the meter, a communications command identifying a selected one of the various types of power. The communications interface may comprise an optical communications port.

The invention discloses a method for detecting a power cable fault based on the two-time pulse mode. Compared with the prior detection method, the method is characterized in that the method organically combines the two prior pulse detection methods, namely the high voltage pulse detection method and the low voltage pulse detection method; and when DC high voltage is applied to various high resistance faults of the cable, the method does not record back and forth reflected waves self generated by the fault point, but according to the physical principle that the fault point is electrically discharged under the action of high voltage, and a short circuit fault is formed and kept for a period of time, and adds the two-time low voltage pulse to the fault phase of the cable during the period of time, thereby forming a detection waveform with little interference and strong identification like a low voltage method, and consequently detecting various high resistance faults of the power cable effectively.

The invention discloses a dangling type micro-impulse testing device and method. A dangling system is fixed in a vacuum box, a thruster ignition power source, a circuit switch, a wire and a miniature thruster are integrated to the dangling system in a modularization mode, a dangling type micro-impulse testing system works in a vacuum environment, a remote control switch serves as a circuit switch to conduct remote control ignition, and influences of a miniature thruster ignition resistance wire power source and the wire on testing results are eliminated. A laser Doppler measurer is installed outside the vacuum box, a light path of a single beam laser head in the laser Doppler measurer is adjusted to be centered with a target reflector, the deviation of outgoing beams and incident beams is eliminated, displacement changes of the thruster are accurately measured, and influences of air friction during dangling are avoided. By means of the dangling type micro-impulse testing device and method, the working force of a miniature rocket motor in a short time can be tested, the micro impulses can be tested, and the impulse testing accuracy is high.

The invention discloses a controllable power frequency superposition impulse testing device and a testing method of the testing device. The testing device is characterized by being composed of an impulse voltage generator (1), a power frequency voltage generating device (2), a coupling capacitor (3), a tested object (4) and an automatic ignition device (5). The output end of the impulse voltage generator (1) is connected with the input end of the coupling capacitor (3). The output end of the coupling capacitor (3) is connected with the output end of the power frequency voltage generating device (2) and the high-voltage end of the tested object (4). The input end of the automatic ignition device (5) is connected with the one-time side of a power frequency side voltage adjusting device (17). The output end of the automatic ignition device (5) is connected with the grounding end of an ignition sphere gap (10) of the impulse voltage generator (1). According to the method, actual overvoltage occurring in an electrical power system can be simulated, it can be ensured that waveforms of impulse voltage acting on the high-voltage end of the tested object do not distort, the phase position impacted and superposed to power frequency can be controlled and adjusted, and the power frequency voltage can be prevented from jumping to the impulse voltage generator.

The invention discloses a converter automatic test system and method. The system comprises a master control machine, a programmable switch, a first programmable power source, a power contactor and a load contactor. The system can be used to provide power for a converter automatically, select the communication path and perform automatic low-voltage tests to obtain detection parameters under the control of the master control machine. For example, in low-voltage conditions, four-quardant rectifier module low-voltage pulse tests, inverter module low-voltage pulse tests, four-quardant rectifier module current sensor tests, inverter module current sensor tests, chopping module current sensor tests and inverter module direct-current side voltage sensor tests are performed on the converter automatically, through waveform parameters acquired by a programmable oscilloscope and values of current sensors and voltage sensors acquired by a control module, the test result of the converter can be judged accurately and test data can be stored, so that comprehensive and effective failure detection can be performed.

The invention relates to a method and a device for analyzing electric cables in a network, for the detection and location of defects in networks comprising at least one junction from which there depart N secondary cable stretches. The method includes interposing in the network, in series at the input of each the secondary stretches (T2, T3) starting from the junction (A), a respective bidirectional passive filter (FR2,FR3) able to cut off a frequency band associated with this stretch. The filters all allow through the useful frequencies for the normal operation of the network. A pulsed test is applied to the input of the network signal modulated by N different carrier frequencies each situated in one of the N frequency bands of the filters. The temporal position of test signal spikes reflected for each of the N frequencies is detected, and deducing therefrom the position of possible defects on a stretch of cable of the network.

The invention relates to a device for searching fault points of a cable or a pipeline. The device for searching fault points of the cable or the pipeline comprises a transmitter and a receiver, wherein the transmitter is composed of a control system, a signal producing circuit, a signal amplification circuit, a gear shifting circuit or a voltage limiting circuit for alternating current or direct current output, a power detection circuit, a power regulating circuit, a impedance measurement circuit, an analogue / digital (A / D) sampling circuit, a keyboard and a display device. The device for searching fault points of the cable or the pipeline comprises four detection circuiting methods: low-frequency alternating current detection method, high-frequency alternating current detection method, pulse detection method and impedance detection method. The four detection methods are used and provide evidence for each other, and thus fault points are determined reliably. When the cable or the pipeline is detected, cable or pipeline condition changes, cable line-breaking fault condition, cable insulation condition relative to the ground and the like are considered, and then fault points are found out.

A system and method for generating a test signal used in measuring the speed of a rotating device, such as a fan in a computer system is disclosed. A pulse width modulated (PWM) signal may power the fan with the duty cycle of the PWM signal controlling the speed of the fan. The fan may generate tachometer pulses used for monitoring RPM of the fan. The frequency of the test signal may be selected to be at least twice the frequency of the tachometer pulses. The test signal may be generated from a base frequency signal using two cascaded frequency dividers. The first divider may output a scaled base frequency signal obtained by dividing the base frequency signal by a user programmable scale frequency coefficient corresponding to a maximum test signal frequency for the fan. The second divider may output the test signal by dividing the scaled base frequency signal by a fraction frequency coefficient obtained from and proportional to the current PWM duty cycle value. The test signal may be multiplexed with the PWM signal to obtain existing tachometer pulses even when the PWM signal is not asserted. The scale frequency coefficient may only need to be programmed once for each fan.

The invention discloses a test method based on a final circular test (FCT) multi-station test device. The test method based on the FCT multi-station test device comprises the following steps: establishing a supply voltage database, writing in an address for a printed circuit board assembly (PCBA) of an electric energy meter, writing in a relay return circuit test program for the PCBA of the electric energy meter, establishing a test database, establishing an impulse test database, establishing a clock test database, fixing the PCBA on a single-station test device, supplying power for the PCBA of the electric energy meter, detecting supply voltage, detecting 485 port, detecting a relay return circuit of the PCBA, detecting the impulse of the electric energy meter, detecting a clock of the electric energy meter, lowering the voltage, detecting battery a current of the PCBA of the electric energy meter, and fetching out the PCBA of the electric energy meter from the single-station test device. The test method based on the final circular test (FCT) multi-station test device has the advantages of being time-saving, labor-saving, high in test efficiency and high in precision of test results.

A test circuit includes a first reset pulse generator configured to generate a first reset pulse when a test mode is performed or when power is up, a test mode maintenance signal generator configured to provide a test mode maintenance signal activated in response to a predetermined consecutive test information data, the activation of the test mode maintenance signal being controlled by the first reset pulse, a second reset pulse generator configured to generate a second reset pulse when the test information data is received as a predetermined test mode reset data or when power is up, and a test mode selection signal generator configured to receive the test information data provided from the test mode maintenance signal generator and the test mode maintenance signal and to generate a specific test mode selection signal, the activation of the specific test mode selection signal being controlled by the second reset pulse.

The invention discloses an explosion impulse testing device, system and method. Explosion impulse parameters are converted into slider speed increments which are easy to measure and can reflect an explosion impulse process, the magnitude of the specific impulse of an explosion wave transmission process after explosion can be effectively measured, the test error is small, the accuracy is high, andreliable data can be provided for shock wave damage effect evaluation.

The invention provides a multifunctional high and low temperature impulse testing box which is composed of a heating area, a working area and a refrigerating area. A heating system is arranged in the heating area, a refrigerating system is arranged in the refrigerating area, partition plates are arranged between the areas, the two ends of each partition plate are respectively provided with a ventilating door, and the ventilating doors are respectively connected with a ventilating door control device. The control end of the heating system, the control end of the refrigerating system and the control ends of the ventilating door control devices are connected to a PLC. The multifunctional high and low temperature impulse testing box is characterized in that the PLC is internally provided with a heat and cold impulse testing control system and a high / low temperature alternating testing control system, and the PLC is connected with a work pattern switching circuit. The multifunctional high and low temperature impulse testing box has the advantages that both a cold and heat impulse test and a high / low temperature alternating test can be carried out through the testing box, a box body is simple in structure, the equipment functions are complete, the energy consumption is low, the adjusting time is short, and the service life of the testing box is long.

The invention discloses a time reference redundancy signal intelligent testing system and method of a time synchronization device. The time reference redundancy signal intelligent testing system comprises a GPS / Beidou satellite antenna receiver, a manger for operating a testing and analyzing management program, a time frequency standard source connected with the manager through a communication link for realizing program control, and a time scale impulse testing device, and an IRIG-B (Inter-Range Instrumentation Group) code testing device. The time reference redundancy signal intelligent testing system is characterized by being provided with an intelligent time frequency signal switcher, the program control of the manager is realized through a testing and analyzing management program operating in the manager, program control switching is carried out by the intelligent time frequency signal switcher, and the intelligent time frequency signal switcher is used for testing the time reference redundancy signal switching function. Under the condition of no need of manual intervention, the function and the performance of outside reference signal switching of the time synchronization device are simply and effectively intelligently tested, the complex service function and the performance testing intelligent level of the time synchronization device are reliably improved, the performance is more accurately tested, the testing efficiency is higher, and the testing time is greatly shortened.

A Transmission Line Pulse (TLP) testing system is disclosed that has a negative pulse inverter circuit that prevents large negative reflections which typically occur after the initial TLP pulse is applied to a low impedance device under test (DUT). Avoiding repetitive reflections, which naturally occur in TLP systems, prevents inducing DUT damage and confusing testing results. The pulse inverter circuit reduces reflections to lower levels than prior art TLP configurations, and can also be combined with known techniques to further reduce reflections for different impedance DUTs.

The invention provides a response energy and response impulse testing system of a target. The invention is characterized in that the testing system comprises an initiation system and a data acquisition and processing system. The initiation system comprises an explosion chamber (2), a specimen holder (3) and an exploder (1). The data acquisition and processing system comprises an angle measurer (4), a swinging plate (5), a test pendulum support (6), a shaft seat (7) and a cross shaft (8). The side surface of the explosion chamber (2) is provided with holes. The system is suitable for response analysis of a damaged target and also suitable for propagation characteristic analysis of shock wave after ammunition ammunition detonation.

The invention discloses a method for acquiring characteristic parameters of a liquid metal battery, and a liquid metal battery modelling method. The method comprises the steps of: respectively performing a pulse test in a charging direction, a pulse test in a discharging direction and a hybrid pulse power performance test of the liquid metal battery, so that battery current, voltage and charging and discharging time test data can be obtained; fitting by utilizing the test data, so that a function relational expression of open-circuit voltage Uoc and SOC is obtained; and obtaining the function relational expression of various characteristic parameters related to SOC in the charging and discharging directions respectively by taking the pulse process test data and the charging and discharging process test data as input data of a characteristic parameter identification and simulation model of the liquid metal battery at the same time. According to the method disclosed by the invention, the fact that the characteristic parameters of the liquid metal battery are relatively changed drastically at high SOC and low SOC is sufficiently considered; the liquid metal battery characteristic parameters and output characteristics can be accurately obtained by adjusting a pulse test step and a parameter identification process; and thus, the relatively accurate battery model can be obtained.

Toroidal transformers are currently used only in low-voltage applications. There is no published experience for toroidal transformer design at distribution-level voltages. Toroidal transformers are provided with electrostatic shielding to make possible high voltage applications and withstand the impulse test.

The invention discloses a new-typed traditional Chinese medical impulse testing recording device, which is characterized by the following: transmitting patient impulse signal into electric signal through sensor; storing the digitalized electric signal in the computer system; processing and analyzing; encasing the sleeve on the doctor finger for film signal sensor; testing impulse precisely.

The invention provides a lightning impulse testing circuit and a lightning impulse testing method used for a capacitive composite insulation busbar system. The lightning impulse testing circuit comprises an impulse voltage source, an impulse voltage measuring device, a low pass filtering device, and a tested capacitive composite insulation busbar system. One end of the impulse voltage source is connected with the low pass filtering device, and the other end of which is connected with the high voltage end of the impulse voltage measuring device and the high voltage end of the tested capacitive composite insulation busbar system. The other end of the impulse voltage source is connected with the low voltage end of the impulse voltage measuring device and the low voltage end of the tested capacitive composite insulation busbar system, and is grounded. The low pass filtering device is formed by parallely connecting a capacitor Cp with a resistor Rp. The testing circuit is simple in layout, and the determining of the parameters of the circuit is convenient, and is easy to realize. The testing method satisfies testing requirements of nominal capacitance 5000pF and below capacitive composite insulation busbar lightning impulse tests, and completely satisfies requirements of a GB / T16927.1-2011 standard and a GB / T 22838.-2008 standard on lightning impulse experiment waveform parameters.

A control scheme for reducing current imbalance between parallel bridge circuits in a power converter system is provided. The power converter can include a plurality of bridge circuits coupled in parallel to increase the output power capability of the power system. The parallel bridge circuits can be controlled pursuant to a control scheme for reducing current imbalance between the parallel bridge circuits. In particular, a pulse test can be performed in which a pulse is applied to each of the plurality of bridge circuits. The switch timing of the switching elements responsive to the pulse can be measured and analyzed to determine a timing difference adjustment for one or more of the switching elements of the plurality of bridge circuits. The timing difference adjustment can be stored and used to adjust all subsequent switching events in the parallel bridge circuits.

The invention relates to a method for determining sending time and receiving time of secondary pulses, which belongs to the field of fault testing of cables, and is mainly used for testing of high resistance faults of the power cables. The method comprises the following steps: a) connecting a resistor Z in a high-voltage impulse-flash testing circuit in series, and respectively connecting two ends of the resistor Z with a discharge capacitor C and a discharge switch K; b) utilizing a sensor and a high-speed data acquisition unit for acquiring a discharge current signal i(t) generated by discharge of the discharge capacitor C; c) calculating instantaneous resistance at a cable fault point during the discharge period according to the discharge current signal i(t) and the circuit structure; d) selecting a period of special time corresponding to the instantaneous resistance during the t1-t2 period as a transmitting window; and e) sending and receiving secondary pulse signal waveform in the transmitting window. By applying the method, the blindness in setting sending time delay of the secondary pulses can be avoided, and the success ratio of testing of the secondary pulses can be significantly improved.

A system includes a transformer testing system that includes a mobile platform configured to couple to a vehicle and an impulse testing system coupled to the mobile platform. The impulse testing system includes an impulse generator tower disposed in a lowered position along the mobile platform during transport by the vehicle. The transformer testing system also includes a lift system coupled to the mobile platform. The lift system is configured to lift the impulse generator tower from the lowered position to a raised position. The impulse testing system is configured to perform an impulse test of a high voltage power transformer while the impulse generator tower is disposed in the raised position. The transformer testing system also includes a protective cover disposed on the mobile platform. The protective cover is configured to surround a region having the impulse testing system.

The invention discloses a thin-film capacitor ESL extraction method based on switching transient frequency information. The method comprises the following steps: a, building a silicon carbide MOSFET double-pulse test platform, wherein the capacitor to be tested serves as a bus capacitor of the silicon carbide MOSFET double-pulse test platform and is embedded into a laminated busbar with known parasitic parameters; b, measuring the voltage waveform of the silicon carbide MOSFET in a switching-on or switching-off transient state, and extracting the voltage under-damping oscillation frequency excited by a loop between the capacitor to be measured and the parasitic capacitor of the laminated busbar by using Fourier transform; and c, calculating the internal ESL of the capacitor to be measuredaccording to the measured voltage under-damping oscillation frequency. The silicon carbide MOSFET double-pulse test platform built in the invention has the advantages of low cost and miniaturization,avoids large-current oscillation of the capacitor body in the extraction process of the ESL, does not need an additional short-circuit test, and has relatively high test safety.

The invention provides a double-cable transmission line pulse testing system. Through developing a TLP (Transmission Line Pulse) test system, a target of quantitatively evaluating the performance characteristic of an electro-static discharge (ESD) protecting circuit is realized in a manner of simulating a real electrostatic discharging manner by means of a short-pulse square wave, thereby increasing a testing energy which is applied to two ends of a tested device, and improving testing result accuracy. The transmission line pulse testing system comprises a voltage transmission line part for charging and discharging, an attenuating filtering circuit structure which is used for matching a system impedance and attenuating the waveform of a reflecting pulse, and a leakage current testing part which is used for evaluating inner damage of the tested device, wherein a different resistance type attenuator design method is adopted for an attenuator part for matching an impedance change after matching. A Basel wave filter is used as a filter for realizing waveform edge shaping and realizing rare overshoot.

The invention discloses an impulse testing system, which comprises a pressure sensor and / or a displacement sensor, a data acquisition device and an impulse testing device, wherein the data acquisition device is used for receiving pressure information, generating first timed triggering information when the pressure sensor senses the pressure information, generating second timed triggering information when the pressure sensor stops sensing the pressure information, and / or receiving position information, generating third timed triggering information when the displacement sensor senses the position information and generating fourth timed triggering information when the displacement sensor stops sensing the position information; the impulse testing device comprises a timing unit and a processing unit, wherein the timing unit is used for obtaining timing information and the processing unit is used for calculating an impulse value according to the timing information and the pressure information or the position information. The impulse testing system provided by the invention has the advantages the automatic processing can be realized to obtain the impulse, the automatic degree is high, the manual calculation at a later stage is not required, the result is directly obtained, the interference of human factors is avoided and the accuracy of the testing result is guaranteed.

An ESD tester transforms high speed pulses from s 50-ohm impedance to the optimum lower impedance necessary to simulate the Charged Device Model (“CDM”) test impedance. Direct connections to the device under test eliminates the variations in spark or contact resistance of the present test while transforming the test pulse impedances to the appropriate level. Direct device connections with controlled impedance current paths provide either internal device discharge or external test pulse testing to simulate the original test. The sparkless direct connection controlled impedance transformation is identified by its ability to simulate similar device failures at similar test voltage failure levels.

An automatic transmission line pulse testing system is characterized in that a transmission line, a first switch device, a high voltage source meter, an attenuator, a rise time filter, a voltage and current collecting device, a second switch device and a processor are included; the transmission line is connected with the attenuator and the high voltage source meter through the first switch device, the attenuator is connected with the rise time filter, the rise time filter, the voltage and current collecting device and the high voltage source meter are connected with a device to be tested through the second switch device, and the processor is connected with the high voltage source meter, the voltage and current collecting device, the first switch device and the second switch device. The cost of the system is lowered, and the system is easy to implement and high in reliability.

The invention relates to a transport mechanism capable of rising and falling. A bottom plate is provided with a feed screw nut; the feed screw nut is provided with a feed screw in a matching manner; the upper part and the lower part of the feed screw are respectively supported by a feed screw support; the lower end of the feed screw is connected with a hand wheel; the upper end of the feed screw is connected with a transport motor fixing plate. The transport mechanism is characterized in that the left side and the right side of the transport motor fixing plate are respectively provided with a side fixing plate; each set of the side fixing plates is provided with a transport module; the outer sides of each set of the transport modules are respectively provided with a set of pressing modules; the rise and fall of the transport modules can be adjusted by the hand wheel; the pressing modules can be driven by the transport modules to move in a Y-axis direction, so a lead terminal of a stator winding can be conveniently guided in place. According to the transport mechanism disclosed by the invention, the lead terminal of the motor stator winding is guided, confirmed in position, rectified and pressed through the mechanism, so that the lead terminal of the motor stator winding and an electric conduction platform of a stator impulse testing machine are reliably contacted and conducted to automatically test the electrical performance of the stator winding.