After in-depth study on the three main forms of direct lightning strike, conducted lightning strike and induced lightning strike, people have established the theory of lightning induction and high-voltage counterattack, and defined the transmission law of high-voltage lightning wave on metal wire On this basis, gap series fuse arrester, gapless zinc oxide arrester and transient overvoltage surge suppressor (TVS) were invented The comprehensive application of these technologies in power and other metal transmission lines has effectively prevented the catastrophic damage of conducted lightning to people and the environment.
The main sources of surge (impulse) voltage generated by lightning stroke are as follows: external circuit (outdoor) is directly struck by lightning, and the injected large current generates surge voltage through grounding resistance or external circuit impedance; In the building, induced voltage and current are generated on the external conductor by indirect lightning stroke; The lightning grounding current is coupled with the common grounding path of the equipment group grounding system If there is a lightning protection device, when the protection device moves, the voltage and current may change rapidly and be coupled with the internal circuit, which will still produce transient impact.
Therefore, surge (impact) protection of electronic equipment has become a problem that electronic product designers must face and solve The relevant surge protection standards and their tests provide the basis and means for determining the conformity of surge protection design of electronic products.
For different electronic products, electrical product standards have different requirements for surge (impact) anti-interference test, but most of these standards directly or indirectly refer to IEC61000-4-5 electromagnetic compatibility test and surge (impact) anti-interference test of measurement technology.
IEC61000-4-5 is an international standard of IEC on Surge immunity It usually refers to the international test method for evaluating the immunity of electronic products to interference caused by high-energy induced lightning noise It records the specifications of surge test instruments, test environment and methods. The purpose of the test laboratory is to establish a common reference standard to evaluate the immunity of electrical and electronic equipment under impact The test object covers almost all electrical and electronic equipment However, for automobile and on-board electronic equipment, the test method is specified in ISO7637 standard.
IEC61000-4-5 high energy transients are usually the result of lightning strikes Lightning can generate surges of several joules in energy through the following mechanisms:
1. Direct impact on primary or secondary circuit.
2. Indirect cloud to ground or cloud to cloud attacks will generate a field of induced voltage in all conductors.
3. The ground current from the nearby cloud to ground discharge is coupled to the grounding network through the common impedance path.
IEC 61000-4-5 defines two combined wave pulses (open circuit voltage and short circuit current) The most common combined wave tests are 1.2/50 and 8/20, and the second is 10/700 and 5/320, which are usually called telecommunication waves IEC 61000-4-5 test standard definitions:
1. Scope of test level
2. Test equipment
3. Test device
4. Test procedure
Therefore，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.
Due to the high voltage risk during the Surge Test, we suggest you to option choose the Protect Device for Surge Test PD-E01 to together work with Surge Generator SG61000-5 (The PD-E01 inside size is 30*30*30cm for EUT, other size need to special design)
We suggest you choose LISUN SG-DESK Surge Generator desk to work with SG61000-5 Surge Generator and Isolation Transformer.
Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.
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.SG61000-5