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GB/T 17626.10-2017: Electromagnetic compatibility -- Testing and measurement techniques -- Damped oscillatory magnetic field immunity test
Status: Valid GB/T 17626.10: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 17626.10-2017 | English | 494 |
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Electromagnetic compatibility -- Testing and measurement techniques -- Damped oscillatory magnetic field immunity test
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GB/T 17626.10-2017
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| GB/T 17626.10-1998 | English | 799 |
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Electromagnetic compatibility. Testing and measurement techniques. Damped oscillatory magnetic field immunity test
| Obsolete |
GB/T 17626.10-1998
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PDF similar to GB/T 17626.10-2017
Basic data | Standard ID | GB/T 17626.10-2017 (GB/T17626.10-2017) | | Description (Translated English) | Electromagnetic compatibility -- Testing and measurement techniques -- Damped oscillatory magnetic field immunity test | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | L06 | | Classification of International Standard | 33.100.20 | | Word Count Estimation | 26,244 | | Date of Issue | 2017-12-29 | | Date of Implementation | 2018-07-01 | | Older Standard (superseded by this standard) | GB/T 17626.10-1998 | | Regulation (derived from) | National Standards Bulletin 2017 No. 32 | | Issuing agency(ies) | General Administration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 | GB/T 17626.10-2017: Electromagnetic compatibility -- Testing and measurement techniques -- Damped oscillatory 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 17626:10-1998
Electromagnetic compatibility test and measurement technology
Damped oscillating 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 disturbance of damped oscillating magnetic fields in medium and high voltage substations by equipment under operating conditions:
Immunity requirements:
This section mainly applies to electronic equipment installed in high-voltage substations: Other possible applications are determined by relevant professional standardization technical committees
Will consider:
For equipment installed in different locations, the applicability of this section is determined by the electromagnetic phenomena described in Chapter 3:
This standard does not consider disturbances caused by capacitive and inductive coupling in cables or other components of field equipment:
Conducted disturbances related to this are considered in other standards:
The purpose of this section is to establish a common and repeatable benchmark to evaluate the damped oscillation magnetic field in medium and high voltage substations:
Performance of electrical and electronic equipment in the field:
This section stipulates the following items:
---Recommended test levels;
---Test equipment;
---Test layout;
---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:
3 Overview
Magnetic fields to which equipment is exposed may affect the reliable operation of equipment and systems:
The tests in this section apply when the equipment is subjected to damped oscillating magnetic fields associated with its specific location and installation conditions (for example, the equipment is close to a source of disturbance):
Testing can verify the immunity of the equipment:
The damped oscillating magnetic field is generated when the isolation knife switch is connected to the high-voltage bus:
The waveform of the test magnetic field is the damped oscillation waveform shown in Figure 2, and its characteristics are given in 6:1:1:
Information on oscillation frequency is given in Appendix E:
4 Terms and definitions
The following definitions and terms apply to this document and apply only to magnetic field disturbances: Not all of these terms are included in IEC 60050
(161) in:
4:1
EUT equipmentundertest
Equipment under test:
4:2
induction coil inductioncoil
A conductor ring with a certain shape and size: When a current flows through the ring, a certain magnetic field is generated in its plane and in the enclosed space:
4:3
induction coil factor inductioncoilfactor
The ratio of the magnetic field intensity generated by an induction coil of a certain size to the corresponding current: The magnetic field intensity is the value when there is no EUT:
Measured at the center of the coil plane:
4:4
immersionmethod
The method of applying a magnetic field to the EUT is to place the EUT in the middle of the induction coil (Figure 1):
4:5
proximitymethod
The method of applying a magnetic field to the EUT uses a small induction coil to move along the side of the EUT to detect particularly sensitive areas:
4:6
A conductive plane whose potential is used as a common reference potential for magnetic field generators and auxiliary equipment (a grounded reference plane can be used as an induction coil
part, see Figure 5):
4:7
Decoupling network, anti-inverse filter decouplingnetwork, backfilter
Circuit used to avoid interaction with equipment other than magnetic field testing:
4:8
burst
A limited number of clearly discernible pulse trains or oscillations of limited duration:
5 test levels
The preferred range of test levels is shown in Table 1:
The magnetic field strength is expressed in A/m: 1A/m is equivalent to the magnetic induction intensity in free space of 1:26μT:
6 Test equipment
The test magnetic field is generated by the current in the induction coil and is applied to the EUT 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 size of the generator capacity should be determined by the coil impedance: The coil inductance can range from 2:5μH (1m standard coil) to several microhenries (such as 6μH,
1m×2:6m rectangular induction coil, see 6:2) within the scope:
The technical parameters of the test generator are as follows:
---Current, determined by the selected highest test level and induction coil factor (see 6:2:2 and Appendix A), the range of the induction coil factor
The range ranges from 0:87m-1 (1m standard coil for testing desktop equipment or small equipment) to 0:66m-1 (for vertical equipment or large equipment):
1m×2:6m rectangular induction coil for type equipment testing);
---Operationability under short circuit conditions;
---The low-voltage 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 and performance of the current source considered in this section, that is, the test generator, are given in 6:1:1:
6:1:1 Characteristics and performance of test generator
Test generators are generators that repeatedly produce damped sinusoidal currents: Its technical parameters and characteristics are as follows:
Oscillation frequency: 0:1 (1±10%) MHz and 1 (1±10%) MHz;
Decay rate: Decay to 50% of the peak value after 3 to 6 cycles;
Repetition rate: at 0:1MHz, at least 40 attenuated oscillation waves per second; at 1MHz: at least 400 attenuated oscillation waves per second;
Test duration: 2(-0%, 10%)s or continuous operation;
Output current range: 10A~100A, divided according to coil factor:
Note: The current output range of the standard coil is 12A~120A:
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 by 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, with a cut length of
Moderately twisted pair or coaxial cable:
Disturbance emissions produced by the generator should be verified (see 6:1):
Features to be verified are:
---Output current peak value;
---Damping characteristics;
---oscillation frequency;
---Repetition rate:
This should be verified using a current probe and an oscilloscope or other appropriate measuring instrument with a minimum bandwidth of 10MHz:
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 level and specified:
corresponding magnetic field strength:
The induction coil shall be made of copper, aluminum or other conductive non-magnetic material, and its cross-section and mechanical construction shall facilitate the conduction of the wire during the test:
The circle is stable:
The coil should be "single turn" and have the necessary flow capacity for the selected test level:
The induction coil should be of sufficient size to surround the EUT (in 3 mutually perpendicular directions):
Depending on the size of the EUT, different sizes of induction coils can be used:
The dimensions recommended below produce a magnetic field within the entire EUT (benchtop or stand-mounted) volume with a deviation of ±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 is 1m on a side:
A square shape, or a circle with a diameter of 1m, made of conductors with a smaller cross-section:
The test volume of the standard square coil is 0:6m×0:6m×0:5m (height):
To achieve better field uniformity than 3dB or to test larger equipment, a standard size double coil (Helmholtz line
lock up):
Double coils (Helmholtz coils) should consist of two or more coils with appropriate intervals (see Figure 7, Figure B:4, Figure B:5):
For a standard size double coil with a spacing of 0:8m, the test volume with a field uniformity of 3dB is 0:6m×0:6m×1m (height
Spend):
For example, for a 0:2dB uniform domain, the size and spacing distance of the Helmholtz coil are shown in Figure 7:
b) Induction coils for vertical installations
The induction coil should be manufactured according to the EUT size and the different polarization directions of the magnetic field:
The coil should be able to surround the EUT and its size should be such that the minimum distance from one side of the coil to the EUT housing is equal to the size of the EUT under consideration
1/3:
The coil should be made of conductors with smaller cross-sections:
Note: The EUT size 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 stability:
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 test results obtained from different test equipment, the induction coil should be in its operating conditions (i:e:, before the test, the induction coil should be
Calibrated under free space conditions without EUT):
An induction coil of appropriate size relative to the EUT should be placed with insulating supports at a distance of
at least 1 m away and shall be connected to the test generator specified in 6:1:2:
Magnetic field probes (bandwidth >10 MHz) with dynamic and frequency responses adapted to the oscillating magnetic field should be used to verify the results produced by the induction coil:
generated magnetic field strength:
The magnetic field probe should be placed in the center of the induction coil (when there is no EUT) and turned to the appropriate direction to detect the maximum value of the magnetic field strength:
The current in the induction coil should be adjusted to obtain the magnetic field strength specified by the test level:
Calibration should be carried out at power frequency, and the current value producing the specified field strength should be used for the damped oscillation test of this part:
Calibration procedures should be performed on the test generator and induction coil:
Coil factors are determined (and verified) by the process described above:
The coil factor gives the value of the current (H/I) injected into the coil 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 meters) 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 EUT terminals has an impedance of 50Ω to ground: It can be a power supply circuit:
Line impedance stabilization networks, coupling/decoupling networks, or series resistors and capacitors in input/output control and signal loops, these networks should
Described in the experimental protocol: Terminal networks, anti-inverse filters, etc: 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 is a set of calibrated current probes or shunts, and the transient current measurement instrument 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 technical performance of the EUT:
7 Test layout
The test layout 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 interferes with test instruments and other sensitive equipment near the test arrangement, precautions should be taken:
Examples of test setups are given in Figures 4 and 5:
---Figure 4 is a schematic diagram of the desktop EUT test layout;
---Figure 5 is a schematic diagram of the vertical EUT test layout:
7:1 Ground (reference) plane
The GRP should be placed in the laboratory, the EUT and auxiliary test equipment should be placed on the GRP, and its ground terminal should be connected to the GRP:
GRP should be a 0:25mm thick non-magnetic metal sheet (copper or aluminum): Other metal sheets can also be used, but the minimum thickness should be
0:65mm:
The minimum size of GRP is 1m×1m:
The final size of the GRP depends on the size of the EUT:
The GRP should be connected to the laboratory's safety grounding system:
7:2 Equipment under test (EUT)
The layout and connections of the EUT must meet its functional requirements: The EUT should be placed on GRP with 0:1m thick insulation (such as dry
wooden block) support:
The EUT shell should be directly connected to the safety ground on the GRP via the EUT's ground terminal and the shortest 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 EUT manufacturer should be used: If not recommended, an unshielded device suitable for the signals involved should be used
Cables, all cables should have a length of 1m exposed to magnetic fields:
The anti-reverse filter should be connected to the cable 1m away from the EUT and connected to the ground plane:
The input and output loops connected to the simulator should pass through anti-inverse filters to prevent interference to the EUT:
Communication lines (data lines) should be connected to the EUT using cables specified in technical specifications or standards: Every wire near the EUT
A distance of about 0:1m from the GRP should be maintained:
7:3 Test generator
The test generator should be placed no more than 3m away from the induction coil:
One end of the test generator should be connected to GRP:
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