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Lightning Impulse Voltage Generator Testing Machine/Lightning Impulse Device/Surge Impulse Voltage Generator¹

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Product Description PurposeThe KDLJ-10/350-60kA lightning impulse test equipment is mainly designed for Class I (GB18802.1, YD/T1235.2) of low-voltage distribution system SPD and Class D test (GB18802.21) of low-voltage telecommunications system SPD, used to generate lightning impulse current (10/350) μ Conduct impulse current tests and residual voltage calibration on lightning arrester valve plates, proportional units, and surge protectors (SPD), or use them for other scientific research experiments.This device can output a maximum amplitude of 60kA10/350 μ Perform current capacity and voltage limitation on SPD, and ensure that the waveform meets the requirements of IEC61643.1 and GB18802.1.Rated parametersCharging device input power supply: 380V/10kV/20kVA, two-phase, 50Hz/60HzMaximum charging voltage: 15kVDC ± 10%, maximum charging current 1A,10/350 pulse capacitor: 1600 μ F. The actual maximum charging voltage is 19kV, and the maximum voltage of the capacitor is 20kVNumber of capacitors: 20; Total pulse energy 320kJEach set of capacitors is installed on a fixed bracket for stable positioning; Multiple capacitors can operate in parallel or be freely combined;Trigger gap voltage range 2kV~20kV;Usage time: Charge and discharge every 2 minutes at 100% rated power, capable of continuous operation;10/350 circuit output current amplitude: 6kA~60kA ± 10%The discharge gap is synchronously controlled by graphite ball gap, with a control accuracy within ± 0.5mm;Improve equipment energy efficiency ratio, balance investment costs, suitable for research institutions, research institutes, and laboratoriesTotal weight: approximately 2.5 tons Main technical parameters of lightning impulse equipmenta) Level I test impulse current waveInput power supply: AC 2-phase, 50Hz, 380V/15kV/20kVA.The rise time of the peak current Ipeak in the impulse test is ≤ 50 μ S; Electricity Q transmission time ≤ 5ms;Specific energy W/R release time ≤ 5ms;Charge Q=5 × 10-4 × Ipeak (As);W/R=2.5×10-4×Ipeak2(kJ/Ω);The allowable error of the above parameters:Ipeak≤±10%; Q ≤ ± 10% -10% ≤ W/R ≤+35%.Note 1: When the impulse current meets the above parameters, the current waveform should be as close as possible to the 10/350 μ S waveform.Maximum charging voltage: DC19kV, maximum charging current 0.8A;Rated impulse current amplitude: ± 60kA, 10/350 μ s, output capacity: 10-100%;Residual voltage level of impact: ≤ 5kV.Pulse capacitorParameters: 20kV/80 μ F, single set, quantity: 20 units;Impact energy 215.6 kJTotal capacitance: parallel 20kV/1600 μ F;When outputting 10/350 μ s, the load impedance is above 200m Ω;Charging deviceThe charging method is transformer primary thyristor constant current charging;Bridge rectifier: 2DL-20kV/2A high-voltage rectifier silicon stack, reverse withstand voltage 20kV, maximum average current 1A,The transformer adopts an oil immersed charging transformer, with a primary voltage of 380V, a secondary voltage of 17kV, and a rated capacity of 20kVA;Install a high-voltage rectifier silicon stack inside the oil filled transformer to automatically switch the polarity of the charging voltage;The rectifier silicon stack is placed inside the oil immersed transformer to form a controllable silicon constant current voltage regulating device, which continuously charges and rectifies from zero to the set voltage, reducing the effective space sizeCharging protection resistor: enamel resistance wire is used, and the inductor is tightly wrapped around the insulating tube;The constant current charging device has an adjustable accuracy of 1% for the charging voltage within the range of 10% to 100% of the rated charging voltage;DC resistance voltage divider: using 50kV, 20M, internal resistance using oil immersed metal film resistor. The low-voltage arm resistor is installed on the bottom flange of the voltage divider, and the voltage signal on the low-voltage arm is introduced into the system through a shielded cable;The automatic grounding switch adopts an electromagnetic opening and closing grounding mechanism, and can be automatically grounded through a protective resistor when the test is stopped;The constant current charging transformer (including high-voltage rectifier silicon stack and polarity conversion device) and its protective resistor, automatic grounding switch, and insulation column are installed on the same mobile chassis;High voltage connection and fixation: The constant current charging device can be connected to the body through a metal flexible wire on the side.Discharge gapThe discharge gap adopts a Φ 250mm discharge ball as the discharge gap, and its uniform electric field stabilizes the discharge voltage of over 50kV;The use of black copper in the discharge ball gap has the ability to withstand high currents;The discharge gap can operate for a long time at a current of 60kA10/350 μ s;The discharge gap is installed inside a closed insulation cylinder, and there is an observation window in front of the ball gap. The closed structure adopts a double-layer insulation cylinder, which not only eliminates noise, but also makes the ball gap less susceptible to environmental changes, ensuring stable and reliable discharge, forming a closed ignition and discharge system.The discharge gap is driven by a precision motor, and the ball gap is measured by a 12 bit AD. The overall controllable accuracy of the ball gap is less than 0.5mm;Control systemControl automation is one of the basic requirements and a characteristic of high-voltage and high current testing equipment. The design of the control system embodies the characteristics of low voltage control high voltage and high and low voltage isolation, with the advantages of simple operation, convenient maintenance, and easy testing. Adopting an intelligent control system with PLC as the core not only liberates experimental operators and improves labor productivity, but also enhances equipment operation safety through the safety automatic interlocking of the control system.The control system adopts a human-machine interface (computer) - imported PLC - actuator control mode. PLC can achieve isolation between the operation interface and the control mechanism through fiber optic communication. The human-machine interface adopts a 10 inch touch screen, which is the main device for user operation. It can complete experimental settings, parameter settings, information input, charging voltage and other experimental parameter settings. After the experiment begins, it will perform operations such as starting the experiment, grounding, triggering discharge, warning lights and bells, and adjusting the ball distance.The console is mainly used to complete the following operations and states:(1) Automatic grounding and automatic non grounding of charging equipment;(2) Manually/automatically adjust the distance between fireballs and the distance between cut-off balls;(3) Constant current charging;(4) Manual/automatic adjustment of charging voltage;(5) Manual/automatic ignition pulse transmission;(6) Automatic overcurrent/overvoltage protection;(7) Set voltage display;(8) Display the charging voltage of the first stage capacitor;(9) Point fireball gap indication;(10) Other indicator lights and symbolsThe design and planning of the safety chain comply with CE standards;Control cabinet styleThe control system components use Mitsubishi PLC as the main controller and domestic Kunlun touch screen as the control interface. The control system adopts brands such as Chint, Schneider, and Mingwei Power.Characteristics of measurement and analysis system functionsMeasure cable impedance of 50, double shielded, 15m, 2 pieces;Build a digital measurement system using PC+digital oscilloscope;The impact waveform analysis software automatically reads data and calculates waveform parameters;Experimental data can be saved in chronological order and automatically saved;The test waveform records are stored in the database and can be queried; The measurement system can be connected to other computers through a network;Analysis software can run online or offline;During the testing process, the test data will be automatically read, analyzed, and calculated, and useful test information such as waveform parameters (wavefront time, half wave time, Q and W/R parameters), current amplitude, and limiting voltage will be displayed;Offline reading of test data;Assist in generating experimental reports Applicable conditionsAltitude1000mEnvironmental temperature-5 oC~+40 oCRelative humidity 85% (20 oC), no condensationMaximum daily temperature difference 25 oCUsage environmentindoorNo conductive dustNo fire or explosion hazardsGas without corrosive metals and insulationThe waveform of the power supply voltage is a sine wave, with a waveform distortion rate ofThe grounding resistance shall not exceed 0.5 ΩThe dedicated power supply system should be equipped with lightning arresters

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