Study on Lightning Surge Generator Based on IEC 61000-4-5 Standard: A Case Study of LISUN SG61000-5

Abstract
Lightning surges pose a significant threat to electronic devices, making them a crucial topic in electromagnetic compatibility (EMC) research. The IEC 61000-4-5 surge tester provides a standardized method for evaluating the surge immunity of electrical and electronic equipment. This paper delves into the working principles of lightning surge generators, testing methodologies, and applications, with a focus on the LISUN SG61000-5 Surge Generator. By analyzing this device’s technical specifications and practical use cases, this study aims to provide insights into surge protection design and testing for electronic equipment.

1. Introduction
With the rapid advancement of electronic technology, electronic devices are widely used in various fields. However, lightning strikes and power system switching operations can generate high-energy transient overvoltages (surges), causing serious damage to these devices. Evaluating and improving surge immunity is an essential part of EMC research. The IEC 61000-4-5 surge tester plays a critical role by defining a standardized testing methodology for surge immunity assessment.

2. Overview of IEC 61000-4-5 Standard
The IEC 61000-4-5 standard, published by the International Electrotechnical Commission (IEC), defines test methods and requirements for surge immunity evaluation, specifically addressing transient overvoltages caused by switching and lightning strikes. The standard outlines waveform specifications, test levels, test equipment, and test procedures to provide a uniform assessment framework. The latest version, IEC 61000-4-5:2014, has introduced updates and improvements to testing methodologies and technical requirements.

Surge Generator SG61000-5

3. Working Principle of Lightning Surge Generators
Lightning surge generators are designed to simulate transient overvoltages caused by lightning strikes or switching operations to evaluate the immunity of electronic devices. The core function of these generators is to produce standardized surge waveforms in accordance with IEC 61000-4-5, such as:

• 1.2/50μs open-circuit voltage waveform
• 8/20μs short-circuit current waveform

These waveforms are applied to the Equipment Under Test (EUT) through Coupling/Decoupling Networks (CDN) to assess its surge immunity.

4. Surge Test Methodology

4.1 Test Subjects and Application Scope
The IEC 61000-4-5 surge tester is applicable to power-connected devices, communication equipment, industrial control systems, and more. The primary objective of surge testing is to assess the immunity of these devices against transient overvoltages, ensuring their reliability in real-world conditions.

4.2 Surge Waveforms
The LISUN SG61000-5 surge generator produces two fundamental surge waveforms:

• Open-circuit voltage waveform (1.2/50μs)
• Voltage rise time: 1.2μs ±20%
• Voltage duration: 50μs ±20%
• Short-circuit current waveform (8/20μs)
• Current rise time: 8μs ±20%
• Current duration: 20μs ±20%

4.3 Test Configurations
Surge tests are typically performed in two ways:

• Common-mode test (Line-to-Ground): The surge is applied between the phase line (L) or neutral line (N) and the ground (PE), simulating lightning-induced surges propagating through grounding networks.
• Differential-mode test (Line-to-Line): The surge is applied between the phase line (L) and the neutral line (N), simulating transient overvoltages within the power grid.

4.4 Application of Surges
The LISUN SG61000-5 surge tester applies surges through its built-in Coupling/Decoupling Network (CDN) to ensure compliance with standard testing conditions. The surges can be applied with positive, negative, or alternating polarity for comprehensive evaluation.

5. Test Result Analysis
Test results can be categorized as follows:

• Class A: The device operates normally after the test without degradation.
• Class B: The device may experience temporary functional interruptions but recovers without user intervention.
• Class C: The device requires manual intervention to resume normal operation.
• Class D: The device is permanently damaged and fails to recover.

6. Conclusion and Applications
The LISUN SG61000-5 surge generator is fully compliant with the IEC 61000-4-5 standard, making it an ideal tool for power systems, communication networks, automotive electronics, and household appliances. Its precision and automation make it highly valuable for EMC laboratories and electronic product manufacturers.

As electronic devices become more complex, surge testing technology will continue evolving to meet stricter EMC requirements. LISUN and other manufacturers will keep improving testing solutions to ensure safety and reliability in electronic products.