CE is a safety certification standard and is considered a passport that manufacturers open and enter the European market. From January 2, 2013, all electrical and electronic products entering the European market should be CE marked, and electromagnetic compatibility (EMC) testing is an important test in CE certification. EMC tests include radiated interference (EMI), electrostatic discharge interference (ESD), burst immunity (EFT), voltage drop interference (CSS), and lightning surge (SG). This article focuses on lightning surge testing.
experiment method:
The cause of the surge is the switching transients and lightning transients of the power system; the purpose of the surge immunity test is to establish a common benchmark to evaluate the performance of electrical and electronic equipment in the event of a surge (impact). According to the general requirements of the standard IEC61000-4-5 surge impact immunity test, the lightning surge generator simulates a 1.2/50us voltage waveform, 8/20us current waveform and combined wave (voltage waveform: 10/700us, current waveform: 5/) 320us), through the coupling network, the waveform is coupled into the circuit under test, which has achieved the purpose of the experiment. The experimental grades are divided into 1, 2, 3, 4 and X grades according to the severity of the voltage, wherein X and the open grade, the corresponding voltage strength of each grade is shown in Table 1. The range of severity ratings depends on the environment (the environment subject to the possibility of a surge) and the installation conditions, and are generally classified according to the following conditions:
Level 1: A well-protected environment, such as a control room in a factory or power station.
Level 2: A protected environment, such as a factory without strong interference.
Level 3: Ordinary electromagnetic disturbance environment, no special installation requirements are specified for the equipment, such as cable network installed in general, industrial workplace and substation.
Level 4: Environments subject to severe harassment, such as civil overhead lines, unprotected high-voltage substations.
Class X: Special grade, determined by the user and the manufacturer. Which level is used for a specific product is generally determined by the product standard.
Table 1: Test Level
Experimental results:
The lightning surge test is a destructive test. According to the degree of damage of the measured object, it is divided into the following cases:
a) normal performance within the limits specified by the manufacturer, the entrusting party or the purchaser
b) Temporary loss or reduction of function or performance, but self-recovery after cessation of harassment, without operator intervention;
c) temporarily lost or reduced function or performance, but requires operator intervention to recover;
d) Loss of functionality or performance degradation due to equipment hardware or software corruption, or data loss.
Application range:
According to the latest Electromagnetic Compatibility (EMC) Directive 2004/108/EC, home radio and television receivers, mobile radios, medical and scientific equipment, household appliances and home electronics, teaching electronics, radio and television transmission equipment, industrial Manufacturing equipment, mobile radio and commercial wireless telephone equipment, information technology equipment, aviation and marine radio equipment, communication network equipment and instruments, general lighting and fluorescent lighting and other electronic and electrical products need to do surge immunity test. In combination with the lighting industry, in the standard EN 61547 general lighting equipment. EMC anti-interference requirements clause 5.7 proposed for the lighting products for the surge immunity test needs to meet the following criteria:
Table 2: Surge-input AC power port test level
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