NAIVG Automatic Lightning Impulse Voltage Generator
Times of browsing： Date：2008-06-10
The impulse voltage generator Outline
Impulse voltage test system is a simulation of pulsed high voltage test equipment. In real life, high-voltage pulse is often encountered. For example, the nature of lightning thunder, lightning will appear at very high pulse current and voltage, will be induced around high voltage pulse; and if the switch in the power system equipment can lead to transient co-operation of cutting the pulse voltage . Pulse voltage amplitude of these transients are often in the tens or hundreds of kilovolts kV or more, will result in equipment damage and endanger the security of person, the study of impulse voltage test is necessary. On the other hand, simulate natural lightning discharge mechanism of the phenomenon is of great significance.
In order to generate a high pulse voltage amplitude, is still using 1923, Marx invented multi-level circuit, shown in Figure 1. The circuit in three ways through the capacitor in parallel RL impedance DC voltage source to be charged to the voltage Uo, then the ball through three simultaneous discharge gap f are together, and thus to obtain nearly 3Uo test pulse voltage. Although the actual use of the Marx circuit has many different circuit wiring, but the basic principle is the same.
The impulse voltage generator body and DC charging power supply
Although the impact of charging DC voltage generator power supply body and a variety of structural forms, but the basic principles are based on multi-stage Marx circuit, charging that the capacitors in parallel at all levels, and then discharged in series to get the pulse of high voltage. Signs of impulse voltage generator body, including the main technical parameters:
Rated voltage: maximum charging voltage generator, the sum of all levels.
Rated energy storage: the largest storage capacity at all levels of the generator the sum.
Impulse voltage generator for different structural form, the current voltage level used in the main 100kV, 150kV, 200kV, 300kV several, and each generator power capacity level required according to the test to a reasonable choice. NAIVG series of impulse voltage generator using 100kV voltage level.
Description of the body structure of impulse voltage generator
NAIVG series of impulse voltage generator body designed for indoor use, using three insulated column support structure. Each level in the generator connected to three columns, reliable, and with each other form a stable structure.
Each generator has a low inductance level, the impact of large-capacity capacitors, they are placed in the structure of the central impulse voltage generator. The capacitor uses high-density solid capacitors, light weight, small size and characteristics, even though continuous operation at rated conditions, they also have sufficient life.
Generators used on all of the resistors are plug-type wire-wound resistor. Lightning wave modulated wave resistance with no sense of winding, with a small inductance. The end of the first wave resistance and wave resistance in the generator is installed between the two columns. Charging resistor is mounted in the point gap on one side of the fireball.
DC charging power supply (from the high-voltage transformer, voltage capacitors, high voltage silicon stack form) using double voltage rectification. High-voltage silicon stack installed in an insulating support plate, a simple spring-crimp body can manually change its direction. Through a protective resistance to high voltage DC output to the first stage impulse voltage generator capacitance. Used to measure the charging voltage of the high impedance insulation is also installed in the support board.
Generator is triggered by the ignition trigger the ball gap to the next level of discharge and complete. So the most the next level of ball-gap structure is designed into three space. Trigger pulse from a high, fast-changing pulse voltage. It is produced by the ignition pulse
amplifier. An ignition pulse generator used to detect the coupling capacitor mounted on generator base.
In order to ensure the safe operation of generators, the system provides a grounded body. Once the generator is an exception, grounded in the first discharge switch will automatically charge resistor to ground, the impact of the results of all the capacitors are the next level of resistance by the discharge.
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（Ms.Allen Cici）
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