1 Scope
This Part of GB/T 17626 relates to the immunity requirements, test methods, and range of recommended test levels for equipment to unidirectional surges caused by overvoltages from switching and lightning transients. Several test levels are defined which relate to different environment and installation conditions. These requirements are developed for and are applicable to electrical and electronic equipment.
The object of this Part is to establish a common reference for evaluating the immunity of electrical and electronic equipment when subjected to surges. The test method documented in this Part describes a consistent method to assess the immunity of an equipment or system against a defined phenomenon.
Note: As described in GB/Z 18509-2001, this is a basic EMC publication for use by product committees of the IEC. As also stated in GB/Z 18509-2001, the IEC product committees are responsible for determining whether this immunity test standard should be applied or not, and if applied, they are responsible for determining the appropriate test levels and performance criteria. National Technical Committee on Electromagnetic Compatibility of Standardization Administration of China (SAC/TC 246) and its sub-committees are prepared to co-operate with product committees in the evaluation of the value of particular immunity tests for their products.
This Part defines:
— a range of test levels;
— test equipment;
— test setups;
— test procedures.
The task of the described laboratory test is to find the reaction of the EUT under specified operational conditions, to surge voltages caused by switching and lightning effects at certain threat levels.
It is not intended to test the capability of the EUT's insulation to withstand high-voltage stress. Direct injections of lightning currents, i.e., direct lightning strikes, are not considered in this Part.
Foreword II
1 Scope 1
2 Normative References 2
3 Terms and Definitions 2
4 General 4
5 Test Levels 5
6 Test Instrumentation 6
7 Test Setup 22
8 Test Procedure 27
9 Evaluation of Test Results 28
10 Test Report 29
Appendix A (Informative) Selection of Generators and Test Levels 30
Appendix B (Informative) Explanatory Notes 32
B.1 Different source Impedance 32
B.2 Application of the tests 32
B.3 Installation classification 33
B.4 Minimum immunity level of ports connected to the power supply network 34
B.5 Equipment level immunity of ports connected to interconnection lines 34
Appendix C (Informative) Considerations for Achieving Immunity for Equipment Connected to Low Voltage Power Systems 36
Bibliography 38
