Lightning is a kind of discharge phenomenon between thunder clouds or between thunder clouds and the earth in nature It is characterized by high voltage, large current and short energy release time, which is very harmful Lightning will cause large-scale power cuts in the power system, large-scale burning of forests, destruction of buildings, explosion and fire in oil depots, paralysis of communication systems and damage to household appliances, and endanger people’s property and personal safety.
The test of lightning surge generator is to assess the insulation performance of products against lightning overvoltage. In the operation of power system, there will be various overvoltage conditions, and the lightning full wave and cut-off wave can be used as the standard impulse waveform to simulate the lightning wave, which can assess the electrical insulation strength.
The standard waveform and parameters are specified in detail in the national standards gb311-1997, gb1094.3-2003 and gb/t16927.1-1997 squadron lightning impulse waveform:
1. Full wave of lightning impulse:
Wave front time (also known as wave head time) t1:1.2 ± 30% μ s
Time of half peak (also known as wave tail time) t2: 50 ± 20% μ
Overshoot and oscillation at s peak shall not exceed 5%
Allowable deviation of peak voltage 3%
2. Lightning impulse clipping
The cut-off wave is characterized by parameters such as cut-off time TC, cut-off time TJ, cut-off peak UC, cut-off voltage UJ, zero crossing coefficient u2/uc, etc Cut off time tc: 2-6 inGB1094.3-1985 and IEC76-3 μ s. It is specified as 2-5 in GB/T16927.1-1997, GB7449-1987 and IEC60.1 μ s. We used a cutoff time of 2-5 in the experiment μ S zero crossing coefficient u2/uc is 0.25-0.35 μ s.
3. Operation shock wave
Apparent wavefront time (T1) is 20-250 μ s. The peak time (TD) over 90% is at least 200us, and the time from the current origin to the first zero crossing (T2) is at least 500 μ s. See the relevant provisions of (GB311.3-83) for the method of determining the waveform. The operating shock wave is shown in the following figure:
LISUN lauched, the SG61000-5 fully automatic surge generator (also called lightning surge immunity test, combination wave generator, surge current generator/surge voltage generator, combined surge voltage and current generator) .
How does a surge generator work?
The SG61000-5 surge generator provides a common basis for evaluating the resistance of power cords and internal connectors of different equipment to high energy transient interference caused by natural lightning surge induction and large capacity load switching. It fully meets the IEC 61000-4-5, EN61000-4-5 and GB/T17626.5 standards.
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Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.
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