Design and Fabrication of a High Voltage Lightning Impulse Generator (original) (raw)
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Method to Determine Wave Resistance of Impulse Voltage Generator for Lightning Impulse Test
In the lightning impulse test, the wave resistance (front resistance denoted by Rf and time to half-value resistance denoted by Rt) of impulse voltage generator should be adjusted in order to make the impulse waveform comply with the standard of IEC 60060-1: the standard waveform should have a front time denoted by tf of 1.2 μs with the tolerance is ± 30% and a time to half-value denoted by tt of 50 μs with the tolerance is ± 20%. Aiming at determining the wave resistance of impulse voltage generator quickly, the equivalent discharging circuit of the impulse voltage generator was analyzed mathematically, then non-linear equations for solving Rf and Rt were established and solved by hybrid genetic algorithm. After obtaining the numerical solution of Rf and Rt , the discharge circuit was stimulated and analyzed by using Matlab. Finally, the field test was carried out in the high voltage test hall to verify the simulation results. The results indicate that the method to determine the wave resistance is effective, and can provide theoretical guidance for field test personnel to reduce the equipment debugging time.
International Conference on Grounding and Earthing, 2018
The very high voltage impulse Marx generator is a key tool in lightning laboratory research and experiments. Therefore, simulating lightning long sparks in a laboratory environment are made possible. However, former impulse generators work as a master, so all the connected devices must be operated as slaves. This is generally not a problem but in some special cases it is a major drawback. In this paper we address this problem in designing a simple system to allow the Marx generator to be slaved. This system is relating to the Trigatron spark gap offering instant triggering of the Marx stages. This system has been custom designed, tested and optimized. The complete system proved its purpose and was completely satisfactory.
Journal of Electrical Engineering and Technology, 2014
This paper presents the parameters optimization technology for generating the first short stroke lightning current waveform(10/350 μs) which is necessary for the performance tests of components of lightning protection systems, as required under IEC 62305 and the newly amended IEC 62561. The circuit using the crowbar device specified in IEC 62305 was applied to generate the lightning current waveform. To find the proper parameters of the circuit is not easy because the circuit consists of two parts; circuit I, which relates to the front of current waveform, and circuit II, which relates to the tail. A simulation in PSpise was carried out to find main factors related to the front and tail of 10/350 μs. The lightning current generator was developed by utilizing the circuit parameters found in the simulation. In the result of experiments, new parameters of the circuits need to be changed because of the difference between the simulation and the experiment results. Using the iterative method, the optimized parameters of the circuits was determined. Also a multistage-type external coil and a damping resistor were proposed to make the efficiency of generation to enhance. According to the result in this paper, an optimized first short stroke lightning current waveform was obtained.
Conversion of Impulse Voltage Generator Into Steep Wave Impulse Test-Equipment
International Journal of Modern Physics: Conference Series, 2013
This paper demonstrates the alternative measures to generate the Steep wave impulse by using Impulse Voltage Generator (IVG) for high voltage testing of porcelain insulators. The modification of IVG by incorporating compensation of resistor, inductor, and capacitor has been achieved and further performance of the modified system has been analyzed by applying the generated lightning impulse and analyzing the electrical characteristics of impulse waves under standard lightning and fast rise multiple lightning waveform to determine the effect to improve rise time. The advantageous results have been received and being reported such as increase in overshoot compensation, increase in capacitive and inductive load ranges. Such further reduces the duration of oscillations of standard impulse voltages. The reduction in oscillation duration of steep front impulse voltages may be utilized in up gradation of Impulse Voltage Generator System. Stray capacitance could further be added in order to ...
How to Conduct the Lightning Impulse Withstand Test of Three Gorges Right Bank Substation 550kV GIS
With the rapid development of power grid in China, an increasing number of GIS are adopted in new substations. The lightning impulse test is recommended after the installation of GIS in order to check its insulation performance and reduce the risk of equipment failure. However, owing to the design and production, common lightning impulse generator with large capacitance load especially GIS cannot generate lightning impulse waveform, which meets the requirement. Therefore, based on lightning impulse withstand test of Three Gorges Right Bank 550kV GIS, models of lightning impulse generator and field equipment are established, and simulation calculation is done. According to the result, a method of installing the inductor in the impulse circuit is put forward to generate oscillating lightning impulse which meets the requirement of the test. This method is successfully applied in the test and results are good. Valuable experience has been accumulated for the lightning impulse test on GIS of 750kV, 1000kV substations in China. (http://www.himalayal.com/Impulse-Generator/HowtoConductLightningImpulseTestOnGIS.html)
Simple Designed of High Voltage Pulsed Electric Field Generator Based on Fly-back Transformer
Journal of Physics: Conference Series, 2019
The high pulse voltage low power supply can be built with fly-back transformer as a converter. Generation by using fly-back converter is a significant method which can be improved the circuits of the device to make it simpler, and occupies a smaller space, and cheaper. The study aimed to study and develop a device that will obtain a high pulse voltage low power supply. The results of the study obtained are, the high pulse voltage has reached 50 kV at the frequency of 100 kHz. In addition, when the high pulse voltage is fed to the plane parallel, then at the distance of 50 cm there is a spark, which means it is can generate high pulsed electric fields, it was 50kV/cm.
Characterisation and Generation of High Impulse Voltages and Currents
Transmission and distribution of electrical energy involves the application of high-voltage apparatus like power transformers, switchgear, overvoltage arrestors, insulators, power cables, transformers, etc., which are exposed to high transient voltages and currents due to internal and external overvoltages. Before commissioning , they are therefore tested for reliability with standard impulse voltages or impulse currents. Depending on the apparatus and the type of their proposed application, one differentiates between various types of waveforms of test voltages and test currents. These waveforms are defined by several parameters with tolerances during generation and uncertainties during measurement. For data evaluation of these waveforms, measured, as a rule, with digital recorders, partially standardised evaluation procedures are applied. Thereby, experimental data obtained from extensive investigations with respect to the evaluation of peak oscillations, which are superimposed on a lightning impulse voltage, are taken into account as a function of the oscillation frequency. In the second part of this chapter, various circuits for the generation of high impulse voltages and impulse currents will be discussed in principle. 2.1 Parameters of High-Voltage Impulses For testing high-voltage apparatus, several waveshapes of the high-voltage test impulses are standardised. In addition to switching and lightning impulse voltages with aperiodic waveform, oscillating switching and lightning impulse voltages, which are generated by transportable generators for on-site tests, are also stand-ardised. Lightning impulse voltages are again subdivided into full and chopped lightning impulse voltages, with the chopping occurring at widely variable times. Impulse voltages with an approximately linear rise are designated wedge-shaped and those with a very steep front as steep-front impulse voltages. An analytic representation of impulse voltages is given in Sect. 3.1 and calculation of the spectrum in Sect. 3.2. K. Schon, High Impulse Voltage and Current Measurement Techniques,
Experimental Study on The Overvoltage due to Lightning Surge
2005
Lightning surge damages of low voltage equipments in building are increasing due to increase in electrical and communication networks in the information-oriented society. And electrical circuits with semiconductor are very weak against lightning surge. To achieve effective method of surge protection on low voltage lines, there are needs for the relationship between propagation aspects of lightning surge and arrangement of
2017
Purpose. Description of construction and basic technical descriptions developed and created in Research & Design Institute «Molniya» of the National Technical University «Kharkiv Polytechnic Institute» high-voltage high-current coaxial disk shunt of type of SC-300M2, allowing reliably to measure the peak-temporal parameters (PTP) of pulses of current of artificial lightning in wide peak and temporal ranges with the integral of their action to 15·10 J/Ohm. Methodology. Electrophysics bases of highvoltage impulsive technique, scientific and technical bases of development and creation of high-voltage high-current pulsive electrical equipment including the powerful generators of current of lightning (GCL), and also measuring methods in discharge circuit of the powerful high-voltage GCL AVP high pulse currents of microand millisecond temporal ranges. Results. Offered and described new construction of measuring high-voltage heavy-current shunt, containing a measuring round disk from stain...
Cost Effective Solution for Impulse Voltage Generator
NFC-IEFR Journal of Engineering and Scientific Research, 2016
Studies and experiments performed on high voltage system, which is required to depend on the worldwide manufacturers for its high impulse generator, which is somewhat costly and extensive in size. Because of that, this paper is centered on impulse generator with a sensible expense and exertion. Additionally, it is expected to accomplish a little in size of the test circuit, which is compact and appropriate for any tests or studies. Visualization condition of energy can disentangle understating the execution of the Marx impulse generator is ascertained and imagine for calculating of DC voltages of 10 kV. An Impulse Generator having ten stages is outlined and executed for testing of 11 kV electrical hardware. Simulation & practical results are evaluated. The experiment was performed with software & then compared with actual practical values of the system. First Test is performed at 8.5 kV gap setting then on 9 kV& 9.5 kV. Overall objectives, which are to outline and assemble a High Voltage Generator at a sensib le cost, exertion, and little in size, are accomplished.