Impulse voltage generators which can be also called series L are the key part of the impulse voltage testing systems. They usually vary from 100 kV as much as 1200 kV aggregate charging voltage. Their design is in such a way that they simply useful for testing equipment systems of high voltage of power with lightning and switching impulses as per the IEC standard 60060-1 also called the IEEE St.4. The optimum charging voltage amount is 100 kV stage by having an energy of 5 kJ / stage as maximum. This tallies for twelve stages to optimum output voltage of 900 kV (SI) and 1150 kV (LI) in the no-load scenario.
These generators might be modified to transport out a wide range of special tests on transformers, impulse current testing of surge arresters as well as EMP tests on electrical equipment. The selected modular system enables a variable application in the industries as well in the education and research laboratories. The impulse generators circuit is the Marx multiplier circuit. Impulse capacitors which are organized in generator’s stages are charged in a similar setting with DC voltages of up to 100 kV from the ground’s potential in order to produce impulses which can be connected in series by spark gaps.
For the front time as well as time to half impulse test value adjustment, the generator stages encompass tail resistors and front resistors. A small discharge loop guarantees smooth voltage shape and low internal inductance. The impulse generator is built in 5-column design. Every one of these columns are made of glass-fiber armor-plated plastic support. Three of the columns serve as impulse high voltage ceramic capacitor support in the generator stages.
All the mandatory tail resistors and front are arranged among one of many three columns as well as the fourth column. At the fifth column on one other hand, the fixed sphere gaps as well as the charging resistors belonging to each stage are arranged. The mobile sphere gaps are fixed together in vertically built insulating bar that may be moved horizontally for the gap distance adjustment with the help of a motor drive that’s on the planet potential. The five insulating columns sit on a common sectional steel base designed either as mobile or as stationary type, the former having receptacles or rollers for air cushions.
In terms of mobility, Impulse generators having voltages from 100 as much as 1000 kV are moveable as the Impulse generators having voltages from 1100 as much as 1200 kV are simply stationary systems.
Accessories of the impulse generators on special request include:
Pair of resistors useful for switching transformers impulse test.
Air cushions for impulse generator for moving it on smooth horizontal floor.
Rollers for the test generator. This helps in moving it manually with a dirigible shaft.
Additional inductances and resistors for the lightning impulse voltage test of transformers.
Reactors for the generation of switching impulses and oscillating lightning.
Reactors useful for generation of impulse currents for the surge arresters testing.
Weather-protecting covering for a restricted out-door installation.
The generator can be fitted with a motor-driven earthing rope, which furthermore, short-circuits all the impulse capacitors after the generator is switched off.