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 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 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.

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.

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 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 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.

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.

A method for testing a plurality of DUTs using a plurality of DC instruments and a pulsed instrument includes contemporaneously applying DC signals to the DUTs with respective DC instruments and sequentially performing pulsed measurements on the DUTs with the pulsed instrument.