GB/T 17626.9-2011 English PDF

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GB/T 17626.9-2011: Electromagnetic compatibility -- Testing and measurement techniques -- Pulse magnetic field immunity test
Status: Valid

GB/T 17626.9: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 17626.9-2011	514	Add to Cart	4 days	Electromagnetic compatibility -- Testing and measurement techniques -- Pulse magnetic field immunity test	Valid
GB/T 17626.9-1998	919	Add to Cart	4 days	Electromagnetic compatibility--Testing and measurement techniques--Pulse magnetic field immunity test	Obsolete

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GB/T 17626.5   GB/T 17626.4   GB/T 17626.6   GB/Z 17626.1   GB/T 17626.12   GB/T 17626.3   

Basic data

Standard ID: GB/T 17626.9-2011 (GB/T17626.9-2011)
Description (Translated English): Electromagnetic compatibility -- Testing and measurement techniques -- Pulse magnetic field immunity test
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: L06
Classification of International Standard: 33.100
Word Count Estimation: 26,216
Date of Issue: 2011-12-30
Date of Implementation: 2012-08-01
Older Standard (superseded by this standard): GB/T 17626.9-1998
Quoted Standard: GB/T 2421.1-2008; GB/T 4365-2003; IEC 60060-2-1973; IEC 60469-1-1987
Adopted Standard: IEC 61000-4-9-2001, IDT
Regulation (derived from): Announcement of Newly Approved National Standards No. 23 of 2011
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the operating conditions of the equipment, mainly for the following places of pulsed magnetic field disturbance immunity requirements: industrial facilities and power plants, medium-voltage and high-voltage substations. The applicability of this section by the installation of equipment in different locations, such as described in Chapter 3 determined phenomenon. This section does not consider on-site facilities, cable or other parts of the capacitive and inductive coupling caused by the harassment. Conducted disturbances related to this standard in other EMC considerations. The purpose of this section is to develop a versatility and repeatability of benchmarks to evaluate in a pulsed magnetic field in the domestic, commercial and industrial electrical and electronic equipment performance. This section provides the following: The recommended test levels, test equipment, test configuration, test procedures.

GB/T 17626.9-2011: Electromagnetic compatibility -- Testing and measurement techniques -- Pulse magnetic field immunity test

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Standards of People's Republic of China Replace GB/T 17626:9-1998 Electromagnetic compatibility test and measurement technology Pulsed magnetic field immunity test General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Released by China National Standardization Administration Committee

1 Scope

This part of GB/T 17626 specifies the immunity of equipment under operating conditions to pulsed magnetic field disturbances in the following places: Require: ---Industrial facilities and power plants; ---Medium voltage and high voltage substations: The applicability of this section is determined by the phenomena that occur when equipment is installed in different locations, as described in Chapter 3: This standard does not consider disturbances caused by capacitive and inductive coupling in cables or other parts of the field installation: Conducted disturbances related to this are considered in other EMC standards: The purpose of this section is to develop a general and repeatable benchmark for the evaluation of domestic, commercial and industrial applications exposed to pulsed magnetic fields: Performance of electrical and electronic equipment: This section stipulates the following items: ---Recommended test levels; ---Test equipment; ---Test configuration; ---Test procedures:

2 Normative reference documents

The following documents are essential for the application of this document: For dated references, only the dated version applies to this article: pieces: For undated referenced documents, the latest version (including all amendments) applies to this document: GB/T 2421:1-2008 Overview and Guidelines for Environmental Testing of Electrical and Electronic Products (IEC 60068-1:1988, IDT) GB/T 4365-2003 Electrical terminology electromagnetic compatibility (IEC 60050(161):1990,IDT) Test procedures)

3 Overview

Magnetic fields to which equipment is exposed may affect the reliable operation of equipment and systems: The tests in this section may be used when the equipment is subjected to pulsed magnetic fields related to its specific location and installation conditions (for example, the equipment is close to a source of disturbance): Check the equipment's immunity: Pulsed magnetic fields are caused by lightning strikes on buildings and other metal structures (including antenna poles, grounding bodies and grounding grids) and by low voltage, medium voltage and high voltage Caused by initial fault transients in piezoelectric power systems: In high-voltage substations, pulse magnetic fields can also be generated by circuit breakers connecting high-voltage busbars and high-voltage lines: This test is mainly applicable to electronic equipment installed in power plants and remote control centers: It has nothing to do with distribution network equipment: Other possible applications are considered by relevant professional standardization technical committees: The test magnetic field waveform is a standard current pulse waveform of 6:4/16μs: Note: The 6:4/16μs waveform in IEC 60469-1 corresponds to the 8/20μs waveform in GB/T 16927:2:

4 Terms and definitions

The terms and definitions defined in GB/T 4365-2003 and the following apply to this document:

5 test levels

Preference ranges for test levels are given in Table 1: The magnetic field strength is expressed in A/m, and 1A/m is equivalent to the free space magnetic induction intensity of 1:26μT:

6 Test equipment

The test magnetic field is generated by the current flowing into the induction coil and is applied to the equipment under test using the immersion method: An example of applying the immersion test is shown in Figure 1: Test equipment includes current source (test generator), induction coil and auxiliary test instruments: 6:1 Test generator The output waveform of the test generator should be consistent with the waveform of the test magnetic field and can provide the required current for the induction coil specified in 6:2: The power capacity of the test generator should consider the coil impedance: The coil inductance can range from 2:5μH (1m standard coil) to several μH (such as 6μH, 1m×2:6m rectangular induction coil, within the scope of 6:2): The technical parameters of the test generator are as follows: ---Current capacity, determined by the selected highest test level and induction coil factor (see 6:2:2 and Appendix A): Induction coil due to The number ranges from 0:87m-1 (for desktop equipment or 1m standard coil for small equipment testing) to 0:66m-1 (for floor-standing equipment) equipment or large equipment testing 1m × 2:6m rectangular induction coil); ---Operationability under short circuit conditions; ---The low-potential output terminal is connected to the ground terminal (the ground terminal is connected to the safety ground of the laboratory); ---Take precautions to prevent strong disturbance emissions that may be injected into the power supply network or affect the test results: The characteristics of pulsed magnetic field current sources or test generators are given in 6:1:1 of this section: 6:1:1 Characteristics of test generator The test generator is a non-repetitive (single) pulse current generator with the following characteristics: Technical Parameters Rise time: 6:4(1±30%)μs; Duration: 16(1±30%)μs; Output current range: 100A/m~1000A/m divided by the coil factor; Polarity: positive and negative polarity; Phase relationship with the power frequency: 10° as a step, synchronously adjusted within the range of 0°~360°; Synchronization: triggered by external signals; Standard impulse current generators can be used, such as combined wave impulse generators (waveform 1:2/50μs~6:4/16μs): Note: For standard coils, the peak current output range of the test generator is 120A~1200A: The output current waveform is shown in Figure 2: The schematic diagram of the generator is shown in Figure 3: 6:1:2 Verification of test generator characteristics In order to compare the test results obtained from different test generators, the basic characteristics of their output current parameters should be verified: The output current of the generator connected to the standard induction coil specified in 6:2:1a) should be verified; the connecting wire should be no longer than 3m and has a cut length of Moderately twisted pair or coaxial cable: Disturbance emissions produced by the generator should be verified (see 6:1): Characteristics that should be verified are: ---Output current peak value; ---Rise Time; ---duration: In the short-circuit current loop operation mode, it is recommended to use a wire with a diameter of 1:8mm (2:5mm2) as the loop wire, but attention should be paid to its mechanical rigidity: A current probe with a minimum bandwidth of 10MHz and an oscilloscope or other corresponding measuring instruments should be used for verification: The accuracy of the measurement should be ±10%: 6:2 Induction coil 6:2:1 Characteristics of induction coils The induction coil connected to the test generator specified previously (see 6:1:1) shall produce a uniformity consistent with the selected test class and specified corresponding magnetic field strength: The induction coil should be made of copper, aluminum or other non-magnetic conductive materials, and its cross-section and mechanical structure should be conducive to the stability of the coil during the test: fixed: This coil can produce the magnetic field considered in this part, may be a "single turn" coil, and shall have a suitable current capacity to satisfy the chosen test: level of testing required: In order to reduce the test current, multi-turn coils can be used: The induction coil should be of sufficient size to surround the equipment under test (in 3 mutually perpendicular directions): Depending on the size of the equipment under test, different sizes of induction coils can be used: The following recommended dimensions can generate a magnetic field within the entire volume of the equipment under test (desktop equipment or floor-standing equipment), and the allowable deviation is ±3dB: The magnetic field distribution characteristics of the induction coil are given in Appendix B: a) Induction coil for desktop equipment When testing small equipment (such as computer monitors, electricity meters, programmable transmitters, etc:), the standard size induction coil has a side length of A 1m square, or a 1m diameter circle, is made from conductors of relatively small cross-section: The test volume of the standard square coil is 0:6m×0:6m×0:5m (height): To achieve field uniformity better than 3dB or to test larger equipment, standard size double coils (Helmholtz coil): Double coils (Helmholtz coils) should consist of two coils spaced appropriately, each coil can be single or multiple turns (see Figure 7, Figure B:4, Figure B:5): For standard size double coils with a separation distance of 0:8m, the test volume for 3dB field uniformity is 0:6m×0:6m×1m (high): For example, the size and spacing distance of the Helmholtz coil for 0:2dB non-uniformity are shown in Figure 7: b) Induction coil for floor-standing equipment Induction coils should be manufactured according to the size of the equipment under test and the different polarization directions of the field: The coil should be able to surround the equipment under test and should be of such a size that the minimum distance from one side of the coil to the enclosure of the equipment under test is equal to the equipment under test under consideration: 1/3 of the equipment size: The coil should be made of conductors with smaller cross-sections: Note: The size of the equipment under test may be larger, and the induction coil may be made of a "C"-shaped cross-section or a "T"-shaped cross-section conductor in order to have sufficient mechanical rigidity: The test volume is determined by multiplying the test area of the coil (60% × 60% of each side) by the height (corresponding to 50% of the shorter side of the coil) Decide: 6:2:2 Calibration of induction coil and coil factor In order to be able to compare the test results obtained by different test equipment, before the test, the induction coil should be under operating conditions (no pressure in the coil): Calibration is performed under the free space conditions of the test equipment): An induction coil of appropriate size relative to the equipment under test should be placed with insulating supports away from laboratory walls and other magnetic objects: At least 1m away and should be connected to the test generator specified in 6:1:2: A magnetic field probe (bandwidth >10MHz) with dynamic response and frequency response suitable for the pulsed magnetic field should be used to calibrate the induction coil: The intensity of the magnetic field produced: The magnetic field probe should be placed in the center of the induction coil (when there is no equipment under test) and have appropriate directionality to detect the maximum magnetic field strength: Large value: The current in the induction coil should be adjusted to obtain the magnetic field strength specified by the test class: Calibration should be carried out at power frequency, and the current value of the generated specified field strength should be used for the pulse test of this part: Calibration should be carried out with a test generator and induction coil: The coil factor is determined (and verified) by the process described above: The coil factor gives the value of the current injected into the coil (H/I) to obtain the required test magnetic field: Information on test magnetic field measurements is given in Appendix A: 6:3 Test instruments and auxiliary instruments 6:3:1 Test equipment Test equipment includes: ---Current measurement systems (probes and instruments) used to regulate and measure the current injected into the induction coil; ---Terminal networks connected to power lines, control lines and signal lines, anti-reverse filters, etc: The termination network used on all external circuits connected to the terminals of the equipment under test has a specified impedance to ground of 50Ω: It can be powered back Line impedance stabilization networks, coupling/decoupling networks, or series resistors and capacitors in input/output control and signal loops: These networks The network should be described in the test protocol: The terminal network and anti-inverse filter should be compatible with the operating signal: An anti-reverse filter should be used when connecting to the simulator (see 6:3:2): The current measurement system includes a calibrated current probe or shunt, and a transient current measurement instrument that should have a bandwidth of 10MHz: The accuracy of the measuring instrument should be ±10%: 6:3:2 Auxiliary instruments Auxiliary instruments include simulators and other instruments necessary to operate and verify the performance of the equipment under test:

7 Test configuration

The test configuration includes the following aspects: ---Ground (reference) plane (GRP); ---Equipment under test (EUT); ---Test generator; ---Induction coil; ---Terminal network, anti-inverse filter: If the test magnetic field may interfere with test instruments and other sensitive equipment near the test device, precautions should be taken: Examples of test configurations are given in the following figures: Figure 4 is a schematic diagram of the test configuration of desktop equipment; Figure 5 is a schematic diagram of the test configuration of floor-standing equipment: 7:1 Ground (reference) plane The ground (reference) plane (GRP) should be placed in the test room, and the equipment under test (EUT) and auxiliary test equipment should be placed in the ground (reference) on a flat surface and connected to it: The ground (reference) plane should be a 0:25mm thick non-magnetic metal plate (copper or aluminum): Other metal sheets can also be used, but their thickness is minimum Should be 0:65mm: The minimum size of the ground (reference) plane is 1m x 1m: The final size of the ground (reference) plane depends on the size of the device under test: The ground (reference) plane should be connected to the laboratory's safety grounding system: 7:2 Equipment under test The arrangement and connections of the equipment under test shall meet its functional requirements: The equipment should be placed on a ground (reference) plane with 0:1m thickness between them Insulating (such as dry wood blocks) support: The enclosure of the equipment under test shall be directly connected to the safety ground of the ground (reference) plane via its ground terminal using the shortest possible connection: The power supply, input and output circuits should be connected to the power supply, control and signal sources through anti-reverse filters: Cables supplied or recommended by the equipment manufacturer should be used: If not recommended, an unshielded cable suitable for the signal of the equipment under test should be used: cable: All cables should have a length of 1m exposed to magnetic fields: The anti-reverse filter should be connected at a cable length of 1m from the equipment under test and connected to the ground plane: The input and output loops connected to the simulator should pass through anti-reverse filters to prevent interference with the equipment: Communication lines (data lines) should be connected to the equipment under test using cables specified in technical specifications or standards: Every wire in the vicinity of the device under test The wire should be kept about 0:1m away from the ground (reference) plane: 7:3 Test generator The test generator should be placed no more than 3m away from the coil: One end of the generator should be connected to the ground (reference) plane: 7:4 Induction coil The induction coil specified in 6:2:1 shall surround the equipment under test placed at its center: According to the general criteria specified in 6:2:1a) and b) Then, when testing in different vertical directions, induction coils of different sizes can be selected: An induction coil used in a vertical position (horizontally polarized field) can be connected directly to the ground (reference) plane (at the root of a vertical conductor): part), the ground (reference) plane serves as the bottom edge and becomes part of the coil: At this time, the shortest distance from the device under test to the ground (reference) plane is 0:1m is enough: The induction coil shall be connected to the test generator in the same manner as the calibration procedure specified in 6:2:2: The induction coil selected for the test shall be specified in the test plan: ......

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