Charging device input power supply: 380V/10kV/20kVA, two-phase, 50Hz/60Hz Maximum 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 20kV Number of capacitors: 20 units; Total pulse energy 320kJ Each group of capacitors is installed on a fixed bracket and can be stably positioned; Multiple capacitors can be operated in parallel and freely combined; Trigger gap voltage range 2kV~20kV; Duration of use: 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 adopts synchronous control of graphite ball gap, with a control accuracy of within ± 0.5mm; Improving equipment energy efficiency ratio, balancing investment costs, suitable for application in research institutions, research institutes, and other units and laboratories Total weight: approximately 2.5 tons Main technical parameters of lightning impulse equipment a) Level I test shock current wave Input power supply: AC 2-phase, 50Hz, 380V/15kV/20kVA. Impulse test current peak Ipeak rise time ≤ 50 μ S; Charge quantity Q transfer time ≤ 5 ms; Specific energy W/R release time ≤ 5 ms; Charge quantity 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 wave should be as close as possible to 10/350 μ S-waveform. Maximum charging voltage: DC19kV, maximum charging current 0.8A; Rated amplitude of impulse current: ± 60kA, 10/350 µ s, output capacity: 10-100%; Impact residual voltage level: ≤ 5kV.
Pulse capacitor Parameter: 20kV/80 µ F, single sleeve, quantity: 20 units; Impact energy 215.6kJ Total electrical capacity: parallel 20kV/1600 µ F; When outputting 10/350 µ s, the load impedance is above 200m Ω;
Charging device The charging method is constant current charging of transformer primary thyristor; Bridge rectifier: 2DL-20kV/2A high-voltage rectifier silicon stack, reverse withstand voltage of 20kV, maximum average current of 1A, The transformer adopts an oil immersed charging transformer, with a primary voltage of 380V and a secondary voltage of 17kV, and a rated capacity of 20kVA; Install a high-voltage rectifier silicon stack inside an oil filled transformer to automatically convert 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 regulation device, which continuously charges and rectifies from zero to the set voltage, reducing the effective space size Charging protection resistor: using enameled resistor wire with inductance tightly wound on the insulating tube; The constant current charging device has an adjustable accuracy of 1% for 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 resistance. The low-voltage arm resistance is installed in the bottom flange of the voltage divider, and the voltage signal on the low-voltage arm is introduced into the system through shielded cables; The automatic grounding switch adopts an electromagnetic opening and closing grounding mechanism, which can automatically ground through a protective resistor when the test stops; The constant current charging transformer (including high-voltage rectifier silicon stack and polarity conversion device) and its protective resistor, automatic grounding switch, and insulation pillar are installed on the same mobile chassis; High voltage connection and fixation: The constant current charging device can be connected to the body with a metal flexible wire on the side.
Discharge gap Discharge gap adopts Φ The 250mm discharge sphere serves as the discharge gap, and its uniform electric field stabilizes the discharge voltage exceeding 50kV; The use of black copper in the discharge ball gap has the ability to withstand strong currents; The discharge gap can run for a long time at 60kA10/350 μ Under s current; 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, and the discharge is stable and reliable, 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 system Control automation is one of the basic requirements for high-voltage and high current testing equipment, and it is also a characteristic of this set of equipment. The design of the control system reflects the characteristics of low voltage control high voltage, high and low voltage isolation, with the advantages of easy operation, easy maintenance, and convenient testing. By adopting an intelligent control system with PLC as the core, it can not only liberate experimental operators and improve labor productivity, but also improve equipment operation safety through safety automatic interlocking of the control system. This control system adopts a control mode of human-machine interface (computer) - imported PLC - actuator. The 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 operated by the user. It can complete experimental settings, parameter settings, information input, charging voltage and other experimental parameter settings. After starting the experiment, it performs actions such as starting the experiment, grounding, triggering discharge, warning lights and bells, and ball distance adjustment.
The console is mainly used to complete the following actions and states: (1) Automatic grounding and automatic ungrounding of charging equipment;
(2) Manual/automatic adjustment of ignition ball gap distance and manual adjustment of cutoff ball gap distance;
(3) Constant current charging;
(4) Manual/automatic adjustment of charging voltage;
(5) Manually/automatically emit ignition pulses;
(6) Automatic protection for overcurrent/overvoltage;
(7) Set voltage display;
(8) Display of charging voltage for the first stage capacitor;
(9) Ignite ball gap indication;
(10) Other indicator lights and symbols The safety chain is designed and planned according to CE standards;
Control cabinet style The control system components use Mitsubishi PLC as the main controller, and domestic Kunlun touch screen as the control interface. The control system uses brands such as Chint, Schneider, and Mingwei Power. Characteristics of measurement and analysis system functions Measure cable impedance 50, double shielded, 15m, 2 pieces; Constructing a digital measurement system using PC+digital oscilloscope; The impact waveform analysis software automatically reads data and calculates waveform parameters; The experimental data can be saved and automatically saved in chronological order of the experiment; 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; The analysis software can run online or offline; During the testing process, the test data is automatically read, analyzed and calculated, and useful testing information such as waveform parameters (wavefront time, half wave time, Q and W/R parameters), current amplitude, and limiting voltage are displayed; Read test data offline; Assisted generation of experimental reports
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