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surge
Simulate faults in the power grid; The interference caused by natural lightning strikes or the impact of large capacity loads connected to the power grid on equipment. The discharge waveform is an open circuit voltage of 1.2/50us and a short-circuit current of 8/20us, characterized by a slow rise time, long duration, and high energy
Surge Immunity Test is an important component of Electromagnetic Compatibility (EMC) testing, used to simulate transient high-energy interference that equipment may encounter in actual usage environments. This interference is usually caused by faults in the power grid (such as short circuits or ground faults), natural lightning strikes, or the connection of large capacitive loads (such as large motors or capacitor banks) to the power grid. The purpose of surge testing is to evaluate the anti-interference performance of the equipment under test (EUT) against this high-energy transient interference.
Test purpose
The main purpose of surge testing is to verify whether the equipment can maintain normal function without performance degradation, misoperation, or damage when subjected to high-energy transient interference. This is crucial for ensuring the reliability and safety of equipment, especially in fields such as industrial control, power systems, communication equipment, and consumer electronics.
Test Standard
Surge testing is usually conducted according to international or industry standards, and common standards include:
IEC 61000-4-5: Surge immunity testing standard developed by the International Electrotechnical Commission (IEC).
EN 61000-4-5: European standard, consistent with the content of IEC 61000-4-5.
GB/T 17626.5: Chinese National Standard, equivalent to IEC 61000-4-5.
test method
Test environment:
Testing is typically conducted in a laboratory environment using a specialized surge generator.
The testing environment should avoid external electromagnetic interference to ensure the accuracy of the test results.
Test equipment:
Surge generator: used to generate surge waveforms that meet standard requirements.
Coupling/Decoupling Network (CDN): couples surge interference to the power or signal lines of the device under test, while preventing interference signals from affecting other devices.
Monitoring equipment: used to monitor the working status and performance of the tested equipment.
Test steps:
Connect the test equipment to the surge generator and connect the necessary power and signal lines.
Set the parameters of the surge generator according to the testing standards:
Open circuit voltage waveform: 1.2/50 µ s (rise time 1.2 µ s, half wave time 50 µ s).
Short circuit current waveform: 8/20 µ s (rise time 8 µ s, half wave time 20 µ s).
Test voltage levels: typically 0.5 kV, 1 kV, 2 kV, and 4 kV, depending on the equipment category and standard requirements.
Inject surge interference into the power lines, control lines, or signal lines of the tested equipment through a coupling/decoupling network.
Gradually increase the voltage level of surge interference and observe whether the tested equipment shows performance degradation, misoperation, or damage.
Record the test results, including the response of the tested equipment and any abnormal phenomena.
Test parameters:
Open circuit voltage waveform: 1.2/50 µ s.
Short circuit current waveform: 8/20 µ s.
Test voltage levels: typically 0.5 kV, 1 kV, 2 kV, and 4 kV.
Coupling methods: Line Earth, Line Line, etc.
Test result evaluation
According to the standard, the tested equipment should maintain normal operation during the testing process without significant performance degradation or functional failure.
Failure criteria: If the device experiences performance degradation, misoperation, or damage during testing, it will be considered a test failure.
Rectification measures: For devices that have not passed the test, the following measures may need to be taken:
Add surge protection devices (such as varistors, gas discharge tubes, TVS diodes, etc.).
Optimize the power and signal line design of the equipment.
Use isolation transformers or filters.
Application field
Surge testing is widely used in the following fields:
Industrial equipment: such as PLC, frequency converter, industrial robots, etc.
Power system: such as transformers, circuit breakers, smart meters, etc.
Communication equipment: such as base stations, routers, switches, etc.
Consumer electronics: such as computers, household appliances, etc.
Automotive electronics: such as car chargers, battery management systems, etc.
Test significance
Through surge testing, it can ensure that the equipment can still operate stably under high-energy transient interference, meet regulatory requirements, and improve user satisfaction. This is of great significance for ensuring the reliability and safety of equipment in complex power grid environments, especially in areas with frequent lightning strikes or unstable power grids.
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