1 Scope
This part specifies to the immunity requirements of equipment, under operational conditions, to magnetic disturbances at power frequency related to:
— residential and commercial locations;
— industrial installations and power plants;
— medium voltage and high voltage sub-stations.
The applicability of this part to equipment installed in different locations is determined by the presence of the phenomenon, as specified in Chapter 3.
This part does not consider disturbances due to capacitive or inductive coupling in cables or other parts of the field installation.
Other IEC standards dealing with conducted disturbances cover these aspects.
The object of this part is to establish a common and reproducible basis for evaluating the performance of electrical and electronic equipment for household, commercial and industrial applications when subjected to magnetic fields at power frequency (continuous and short duration field).
This part defines:
— recommended test levels;
— test equipment;
— test set-up;
— test procedure.
Other kinds of magnetic fields would be object of standardization:
— fields at other power frequencies (16 2/3 to 20 or 30 to 400 Hz);
— fields of harmonic currents (100 Hz to 2 000 Hz);
— fields of higher frequencies (up to 150 kHz, e.g. for mains signaling systems);
— D.C. fields.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 17626. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
IEC 60068-1:1988 Environmental Testing — Part 1: General and Guidance
3 General
Foreword III
1 Scope
2 Normative References
3 General
4 Terms and Definitions
5 Test Levels
6 Test Equipment
7 Test Set-up
8 Test Procedure
9 Evaluation of Test Results
10 Test Report
Appendix A (Normative) Induction Coil Calibration Method
A.1 Magnetic field measurement
A.2 Calibration of the induction coil
Appendix B (Normative) Characteristics of the Induction Coils
B.1 General
B.2 Induction coil requirements
B.3 Induction coil characteristics
B.4 Summary of characteristics of induction coils
Appendix C (Informative) Selection of the Test Levels
Appendix D (informative) Information on Power Frequency Magnetic Field Strength
Figure 1 Example of Application of the Test Field by the Immersion Method
Figure 2 Schematic Circuit of the Test Generator for Power Frequency Magnetic Field
Figure 3 Example of Test Set-up for Table-top Equipment
Figure 4 Example of Test Set-up for Floor-standing Equipment
Figure 5 Example of Investigation of Susceptibility to Magnetic Field by the Proximity Method
Figure 6 Illustration of Helmholtz Coils
Table 1 Test Levels for Continuous Field
Table 2 Test Levels for Short Duration: 1 s to 3 s
Figure B.1 Characteristics of the Field Generated by a Square Induction Coil (1m Side) in Its Plane
Figure B.2 3dB Area of the Field Generated by a Square Induction Coil (1m Side) in Its Plane
Figure B.3 3dB Area of the Field Generated by a Square Induction Coil (1m Side) in the Mean Orthogonal Plane (Component Orthogonal to the Plane of the Coil)
Figure B.4 3dB Area of the Field Generated by a Two Square Induction Coils (1m Side) 0.6m Spaced, in the Mean Orthogonal Plane (Component Orthogonal to the Plane of the Coils)
Figure B.5 3dB Area of the Field Generated by a Two Square Induction Coils (1m Side) 0.8m Spaced, in the Mean Orthogonal Plane (Component Orthogonal to the Plane of the Coils)
Figure B.6 3dB Area of the Field Generated by a Rectangular Induction Coil (1m × 2.6 m) in Its Plane
Figure B.7 3dB Area of the Field Generated by a Rectangular Induction Coil (1m × 2.6 m) in Its Plane (Ground Plane As a Side of the Induction Coil)
Figure B.8 3dB Area of the Field Generated by a Rectangular Induction Coil (1m × 2.6 m) with Ground Plane, in the Mean Orthogonal Plane (Component Orthogonal to the Plane of the Coil)
Table D.1 Values of the Maximum Magnetic Field Produced by Household Appliances (Results of the Measurements of 100 Different Devices of 25 Basic Types)
Table D.2 Values of the Magnetic Field Generated by a 400kV Line
Table D.3 Values of the Magnetic Field in High Voltage Sub-station Areas
Table D.4 Values of the Magnetic Field in Power Plants
