MECJ-25kA Surge current generator Send email to us

(1) Adopt thyristor constant current voltage regulator; rated output voltage ±150kV rated output DC current 10-300mA;
(2) Adopt oil-immersed charging transformer, secondary voltage 80kV, rated capacity 15 kVA;
(3) Adopt 2DL-200kV/500mA high voltage rectifier silicon stack, reverse withstand voltage 300kV, average current 0.2A, high voltage rectifier silicon stack installed in the charging transformer, the charging voltage polarity can be automatically reversed by the transmission mechanism. There is a polarity switch conversion button on the console;
(4) The high voltage rectifier silicon stack protection resistor adopts enameled resistance wire with inductive dense winding on the insulating tube;
(5) Adopt bilateral symmetrical voltage doubling constant current charging method;
(6) When automatic control, the constant current charging device Within the range of 10% to 100% of the rated charging voltage, the deviation between the actual charging voltage and the set voltage is no more than ±1%, the instability of the charging voltage is no more than ±1%, and the adjustable accuracy of the charging voltage is 1%;
(7) One DC resistor voltage divider, using 150kV, 300M, oil-immersed metal film resistor. The low-voltage arm resistor is installed in the bottom flange of the voltage divider, and the voltage signal on the low-voltage arm is introduced into the control console using a shielded cable;
(8) The automatic grounding switch adopts an electromagnetic separation and closing grounding mechanism, which can automatically short-circuit the main capacitor and ground it through a protective resistor when the test stops;
(9) The charging transformer (including the high-voltage rectifier silicon stack and polarity conversion device) and its protective resistor, automatic grounding switch and insulating support are installed on a chassis;

1. Resistor voltage divider
Main technical requirements
The high-voltage arm is composed of a primary resistor
Rated parameters 150kV/1.5KΩ
Rated lightning impulse withstand voltage is 150kV
Low-voltage arm parameters 400V/1.25Ω
Voltage divider ratio: 2500:1
Voltage divider accuracy Kε≤1%
Overshoot: β≤20%
Square wave response time: ≤10ns

2. Shunt for impulse current measurement
Shunt is used for impulse current measurement, current measurement 10kA/25KA; it meets the requirements of the above-mentioned measured current, the response time meets the requirements of international regulations, and is equipped with a measuring cable;
Structural form: The shunt is a shielded coaxial shunt made of manganese copper sheets, with the characteristics of stable measurement and good response characteristics.
Shunt secondary output voltage: ≤300V
Square wave response time: ≤5ns

3. Computer controlled measurement system
Each level charging voltage setting range: 0-150kV
Each level charging working voltage: 20～100kV
Charging voltage adjustment accuracy: in conjunction with the body, 0.1kV
Charging voltage instability: <1%
3.1 Technical parameters of measurement system:
Inlet voltage: <=±400V Maximum sampling rate: 1.25GS/S Bandwidth: 100MHz
Number of channels: 4 Resolution: 8bit Power: <1000W