GB 12668.3-2003 Speed-adjustable electrical drive systems Part 3: Electromagnetic compatibility standards for products and their specific test methods
Some standard content:
ICS 29. 200
National Standard of the People's Republic of China
GB 12668. 3--2003/IEC 61800-3:1996 Adjustable speed electricat power dive systems-Part 3: FMC product standard including specific test methods(IEC 61800-3:1996,IDT)
Published on October 9, 2003
National Quality Supervision and Inspection General Administration of the People's Republic of China
Implementation on May 1, 2004
GB12668.32003/IEC61800-31996 Chapter 3 Immunity requirements and Chapter 7 Minimum safety requirements of this part are mandatory, and the rest are recommended. This part is equivalent to the English version of IEC61800-3:1996 "Speed-controlled electrical drive systems Part 3: Electromagnetic compatibility standards for products and their specific test methods"
This part is the third part of GB12663% "Speed-controlled electrical drive systems". At present, GB12668.8 "Speed Regulated Electric Drive System" includes the following parts under the general title:
--GB/T12G68.1 Speed Regulated Electric Drive System Part 1-General Requirements-Regulations for Rated Values of Low-voltage DC Speed Regulated Electric Drive System;
: GB/T12668.2 Speed Regulated Electric Drive System Part 2: General Requirements: Regulations for Rated Values of Low-voltage AC Variable Frequency Electric Drive System;
--\—: GB/T12668.3 Speed Regulated Electric Drive System Part 3: Magnetic Compatibility Standards for Products and Their Specific Test Methods; GB/T12668.4 Speed Regulated Electric Drive System Part 1: General Requirements-Regulations for Rated Values of AC Electric Drive System Greater Than 1kV but Not Exceeding 35kV: - GB12668. Speed Regulated Electric Drive System Part 1: Regulations for Electrical and Thermal Equipment Safety requirements related to other functions: (H/12668.6 Speed-adjustable electrical drive system Part 6: Guidelines for load operation and corresponding rated current form measurement; Appendices A, RC, D) and E of this part are informative appendices. This part is proposed by the China Electrical Equipment Association. This part is the National Power Electronics Standardization Technical Committee Speed-adjustable electrical drive system conductor power converter standardization sub-technical committee.
Drafting units of this part: Tianjin Electric Drive Design Institute, Siemens Electric Drive Co., Ltd., Beijing ABB Electric Drive Systems Co., Ltd., Aimochen Network Energy Co., Ltd., Lingdizhou Automation (Shanghai) Co., Ltd., Chengdu Jialing Electric (Manufacturing Co., Ltd.) The main drafters of this part: Liu Guocheng, Wu Lin, Shi Xinli, Zhao Bin, Dong Guimin, Hu Xiangning, Qiu Wenxie, Ju Li. 1 Scope and purpose
GB 12668.3—2003/1EC 61800-3:1996 Speed-controlled electrical drive systems
Part 3: Electromagnetic compatibility standards for products and specific test methods
This part specifies the electromagnetic compatibility (EMC) requirements for electrical drive systems (hereinafter referred to as PDS). The electrical drive systems here include speed-controlled AC motor drives and DC motor drives. The requirements refer to the case where the PDS is connected to a power supply with a rated voltage of less than 1099V AC effective value. The electromagnetic compatibility requirements for power supply voltages greater than 1000V AC are being developed. Before new publications are published, the requirements for electromagnetic compatibility will be published by manufacturers/suppliers. The PDSs covered by this standard are those installed in industrial and residential environments. Traction applications and electric vehicles are not included. PDSs can be connected to industrial or public distribution networks. Industrial networks are supplied by dedicated distribution transformers, which are usually located in or near the industrial area and only supply industrial users. Alternatively, PLSs can be directly connected to the low-voltage public network, which also supplies residential users. In this case, the neutral line is usually grounded. PLSs covered by this standard are often included in larger systems. The content of the system surface is not covered by this standard. We provide guidance in the reference annex.
In industrial and public environments, it is required to ensure that the PDSs have an adequate electromagnetic compatibility (EMC) level. However, the required level cannot include extreme situations that may occur very rarely. Changes in the EMC performance of the PDS due to fault conditions are not taken into account. The purpose of this part is to determine the limits and test methods for PDS: This part includes requirements for immunity and protection against electromagnetic emissions, which may cause interference to other electronic equipment (such as radio receivers, observation and computing equipment). Immunity is required to protect the equipment from continuous and transient conducted and radiated (including electrostatic discharge) disturbances: For economic reasons, a compromise should be made between emission requirements and immunity requirements according to the actual environment. This part determines the minimum requirements for electromagnetic compatibility of PDS. This part does not specify all safety requirements for equipment, such as protection against electric shock, insulation coordination and related insulation tests, unsafe operation or unsafe effects of faults.
In some special cases, when extremely sensitive equipment is used nearby, additional mitigation measures must be taken: reducing electromagnetic emissions to below specified values or improving the immunity of sensitive equipment. This FMC standard for PDS products takes precedence over other general standards and does not require or need additional EMC tests. If the PDS is part of a device and the device is included in another product EMC standard, the EMC standard for the entire device shall apply. 2 Normative references
The clauses in the following documents become clauses of this part through reference in this part of B12668. For referenced documents with a specified date, all subsequent amendments (excluding dated content) and revisions are not applicable to this part. However, the parties to an agreement based on this part are encouraged to study whether the latest versions of these documents should be used. For any referenced documents not specified, their latest versions shall apply to this part.
GB/T3859.1-1993 Basic requirements for semiconductor converters (cqV1EC:60116-1-1:1991) GB43651995 Electrical terminology (1dt1FC60050(161):1990) GB/T 16935.1-1997 Insulation coordination for equipment in low voltage systems Part 1: Principle, requirements and tests (ilt IE) 60661-1+19923
GB17023.2--199 Electromagnetic compatibility limits for equipment with a rated current not exceeding 16A generating CB in low voltage power supply systems 12658.3-2003/IEC 61800-3: 1996 Limitation of electrical fluctuations and flicker (idt1EC610003-3:1994) GB/Z17625.3--2000 Limit values of electromagnetic tolerance Limits of electrical fluctuations and flicker generated by equipment with rated current greater than 16A in low voltage power supply systems (idt IEC G1000-3-5:1994) GB/T17626.2-1998 Magnetic compatibility test and measurement technology Electrostatic discharge immunity test (idt1F(6100(1-4-2:1995)
GB/T 17626.3 --1998
61000-4-3:1995)
G13/T 17626. 11998
51000-1-4:1995)
GB/T 17626. $—1998
GB/T 17626.6..-1998
61000-4-5:1598)
GR/T 17626. 8- 1998
G3/T 17626. 9--1598
Electromagnetic compatibility
Electromagnetic compatibility
Electromagnetic compatibility
Electromagnetic compatibility
Electromagnetic compatibility
GB/T 17626. 101998
Electromagnetic compatibility
4-1:1993)
G3/7 18039, 2—200
61000-2 6:19963
Test and measurement technology Radio frequency electromagnetic field radiation immunity test (ictrTest and measurement technology
Electrical fast transient pulse immunity test (idtIECTest and measurement technologySurge (burst) immunity test (t1EC6100015: Test and measurement technology
Radio frequency field induced conducted disturbance immunity (itli TFC)T-frequency magnetic field immunity test (idt1EC61000-4-8: Test and measurement technology
Pulse magnetic field immunity test (idt1EC6100i-4-9: Test and measurement technology Damped oscillation magnetic field immunity test (itlt.IE:61300Electromagnetic compatibility environment
. Evaluation of the intensity of low-frequency conducted disturbance emission from non-equipment power supply (iIEC1EC 60050 (131): 1978
International Electrical Dictionary (IEV)
Chapter 131 Circuits and Magnetic Circuits
EC60050 (151): 1978 International Electrical Dictionary (11:V) Chapter 151: Electrical and Magnetic Devices 1Ft: 60364%: 1993 Electrical Installations of Buildings Part 3: Evaluation of General Characteristics EC610C0-2-1: 990 Electromagnetic Compatibility (EMC) Part 2: Environment Chapter 1: Introduction to the Environment Electromagnetic environment for low-impedance conducted disturbances and signal transmission in power supply systems IFC61000-2-2: 1990 Electromagnetic compatibility (EMC) Part 2: Environment Chapter 2 Compatibility level of low-frequency conducted disturbances and signal transmission in low-voltage power supply systems JEC:61000-2-4: 1994 Electromagnetic compatibility (EMC) Part 2: Environment Chapter 4: Compatibility level of industrial equipment to low-frequency conducted impedance bzxZ.net
1EC61000-3-2: 1995 Electromagnetic compatibility (EM) Part 3: Limits Chapter 2: Limits of wave current emission (input current of the device 16A/each phase)
IFC: (ISPR1:1990I Limits and methods of measurement of electromagnetic disturbance characteristics of radio frequency equipment for industrial, scientific and medical (ISM) purposes IEC (ISFR16-1:1993 Technical specifications for radio frequency disturbances and immunity measurement equipment Part 1: Radio frequency disturbance and immunity measurement equipment
3 Definitions
X Definitions of FMC and related phenomena can be found in GR4365, CISPR and other IF: publications (see Chapter 2). For the purpose of this part, the following definitions are added. Electric drive system (PIS) output motor and complete drive module ( (I)M) is a complete transmission module (CDM) and does not include equipment driven by electric motors. The CDM consists of a basic drive module (BDM) and its possible ancillary parts, such as the feeder part or some auxiliary equipment (such as wind equipment). The BDM includes converters, control and self-protection functions. Figure 1 shows the boundary between the PDS and other parts of the equipment and/or manufacturing process. If the electric drive system (PTS) has its own dedicated transformer, then the transformer is part of the complete drive module (CLDM) 3.1
equipment or partial installation
9-2TA0
GB 12668.3—2003/1FC 61800-3: 1996P (Pneumatic Drive Systems)
CJ)M (Complete Drive Modules)
System Control and Processing
RRV<Basic Drive Modules)
Control,
Converter and Protective Equipment
Feeder
Magnetic Motor
Auxiliary Equipment
Motor and Controller
....d.
Driven Equipment
Figure 1 Definition of Equipment and its Contentsunrestricted distributionA sales method in which the equipment is supplied regardless of the EMC technical capabilities of the buyer or user for the drive application.
Note: This method achieves specific emission limits in accordance with the basic FVM protection requirements. 3.2
Restricted distribution restricteddistribulion A sales method under which the equipment is manufactured and supplied to suppliers, buyers or users who, individually or in combination, can meet the current MC technical capabilities for motor drive applications. Note: For economic reasons, by selecting appropriate emission levels, conducting on-site measurements according to actual boundary conditions, and changing technical specifications, the basic EMC protection requirements for specific sets of equipment can be ensured: 3.3
First environment firsl environntent
Civil environment, also including those applications directly connected to the low-voltage power supply network that supplies civil power without intermediate transformers.
Second environment serurdeavirorent
All environments except those applications directly connected to the low-voltage power supply network that supplies civil power. GB 12668.3—2003/1EC 61800-3: 19963.5
Manufacturers premises (for test) A place in the workshop or laboratory of the manufacturer where the equipment is specially tested. The equipment may be H[S, CDM or BT)M. 3.6
In situ (for test) A place where the equipment is installed and used normally by the final user, where the equipment can be tested. 3.7
Test site (radiation) tcstsileiradiatiea) A place that must meet the requirements of measuring the electromagnetic field emitted by the test device under specified conditions [GB436513.8
Port port
Specified FDS The specific boundary between the electromagnetic environment of the production process (see Figure 2) IIEV 131-02-21 revised edition. 3.9
Enclosure port enelasurt purl
[The physical boundary of an IS through which electromagnetic fields can radiate or intrude (see Figure 2)] 3.10
Process measurement and control port pnrt for process image sensing and connection The physical or electrical input/output (I/O) port that connects the process to the PLS defined in Chapter 3 (see Figure 2). 3.11
Power port power port
The port that connects the power supply (and also supplies power to other equipment) 3.12
Mechanical link mechanical link
The mechanical connection between the shaft of the motor in the FIS and the driven production equipment defined in Chapter 3 3.13
Signal interface signal inlerface
Connect the basic drive module or the integrated drive module (3I)M/CI>M) with the input/output (I/O) connection of the line in another part of the PDS (see Figure 2):
machine charging port
process measurement and control exhaust
CHMPIS
other parts
grounding
or part
power supply door
Figure 2 Examples of internal interfaces and ports of PDS
other parts of PDS
motor
PCC, iPC.PC
The definition is shown in 1E 61000 2-4:
Note: - PCC is the common coupling point on the public network; - IPC is the coupling point in the PDS:
PC 3.15 Power interface The connections required for power distribution within a PTDS (see Figure 3, explanation in Appendix A.2). The power interface may have different forms. The power interface can be used to distribute power from one part of the BMCIM to another part of the BMCIM. The power interface can be shared by different PDSs. According to Chapter 4, the impact of multiple power supplies is not considered. For example, see Figure 3 and Figure 1. Figure 3 shows the power interface for distributing power from the input converter to the output converter. The converter converts the power from the intermediate source into another form of power (here into DC) while the transformer converts the intermediate form of power (for example DC) into another form of power (here into AC).The relevant part can be directly applied to the motor. Figure 4 shows the power connection for distributing power to each motor through the gear stage of the isobar (the CEM): In principle, the connection between the inverter and the motor or between each motor unit is also a power connection. This is the last power connection before the conversion into mechanical energy. Power interface Power terminal BDA1 1 All B3M R[M2 Figure 3 Power interface between PIXS and the common DC bus P.2 Multi-motor PL GB 12668.3-2003/1EC 61800-3:1996 This port is in the article All!
Power supply interface between the enclosure 4 and the common input transformer
Cenverter (of the cmplete drive module (CDa)) Converter of the complete drive module (CDM)
The converter of the CM converts the voltage, current and/or frequency of the power supply grid into the voltage and/or current and/or frequency fed to the motor (see Appendix A. 2 for details)
Note 1: The converter consists of commutation electronics and its associated commutation circuits, which are controlled by a power supply or a power supply switch or any other power supply conductor.
2: The converter can be grid commutation, load commutation or load commutation, for example, a converter or inverter combination can be provided, 3. 17
Motor (le:irirc)mtoT
-. An electric machine that converts electrical energy into mechanical energy,! 1EV15:153"3.18
Motor of the PnS (of the PDs)
For the purpose of this standard, the motor includes all sensors installed on it that can be coordinated and detect its operating mode. 4 Common requirements
From the point of view of emission and immunity, all phenomena should be considered separately. For some conditions that do not take into account the influence of multiple power supplies, limits should be given.
4.1 System aspects
The PS can be designed in many configurations. For example, although the power rating is the same, the way in which electrical energy is converted into mechanical energy may be different due to different user requirements and economic conditions. Figure 1 shows the transmission The power system can be equipped with different power parts or auxiliary equipment and different motor and repellent combinations. For these cases, it is not necessary to test every possible solution. In order to realistically simulate the EMC situation, a typical structure should be selected for the type test specified in Article 6.1 of GB3/T3859.1.
GB12668.3—2003/1EC61800-3:1996 The test used to evaluate the immunity should depend on the specific configuration, port, process and operating conditions of the FDS (see Appendix): 4.2 Test
4.2. 1 General conditions
All tests specified in this part ensure compliance with the basic EMC requirements and are type tests only. The tests shall be carried out using the wiring method recommended by the manufacturer.
Depending on economic and practical conditions, the equipment shall be tested on site, in the factory building or at the test site, but this shall be determined by the purpose of the equipment. The equipment shall meet the requirements when measured using the specified test methods. In addition to the tests specified in this part, no other EMC tests are required or necessary. Protective measures shall be taken to prevent possible equipment failures during EMC tests.
During the test, unless otherwise specified by the manufacturer, the IM shall be connected to a standard motor of appropriate rating using the ground cable and grounding specifications specified by the manufacturer: In some cases (e.g. when evaluating low-frequency radiation), additional passive load conditions (resistive or resistive and inductive) may be required. However, in this case, the passive load configuration shall have the same shielding layer as the metal exterior of the motor. It should be noted that the tooth capacitance from the load to the ground is not a standard value when evaluating its high-frequency emission. It can be combined with the motor parasitic capacitance (about 1nF to 20 F or greater). The test description, test method, test characteristics and test equipment are already introduced in the referenced standards and will not be repeated here. However, if some modifications are required during the actual implementation of the test, or if there are other requirements and additional information, or if a specific test method is required, it shall be given in this standard. 4.2.2 Test report
The test results shall be confirmed in the form of a test report. The test report shall clearly and unambiguously state all information related to the test (such as load conditions, cable laying, etc.). The manufacturer shall provide the functional description and the definition of the technical specification limits in the acceptance criteria, which shall be recorded in the test report.
In the test report, the selected test plan is reasonable, and the terminals should be selected for a period of several months to simulate the actual working conditions and ensure that all relevant terminal types are included. The test shall be carried out under the rated power supply and be repeatable. 4.3 User Documentation
The manufacturer shall provide the installer of the BI>M, CLDM or the user of the PDS with the documentation necessary for proper installation into a typical system or production process in the application environment. If external devices or equipment or special connection requirements are required to pass the test, they shall be clearly stated in the user documentation. For example, the size of the network impedance, whether to use shielded or special cables, the maximum length of the cable, whether to use filters, and correct connection to an effective grounding point. In order to meet the immunity and/or emission requirements in different environments, the following table lists the optional components or equipment that need to be added to the P[S: Auxiliary equipment that may be added to the PDS (such as options or enhancements) should also be listed, based on the integrity and characteristics of the delivered product (whether BIM, TDM or PIS) and the sensitivity of the environment: The manufacturer shall be responsible for providing the additional information necessary for the correct typical installation:
This information can also be described in the prohibited section of the test report to explain the final recommended solution: For example, if the BDM is installed in a civilian environment, additional information is required, and the content of the application guide should also be adapted to the typical technical capabilities of the user. 5 Immunity requirements Requirements
5.1 General conditions
The immunity of sub-components of PDS, such as power electronics, drive circuits, protection circuits, control circuits, and display and control panels, to electromagnetic disturbances can be verified by various tests. If necessary, appropriate loads can be used to replace the missing components. The performance of each sub-component can be verified through these tests. The tests on each terminal or interface of the DS included in these components can be carried out by selecting the relevant test methods and test levels from Tables 2 and 3. This method is recommended to ensure quality, and the results can be written into the test report. On the other hand, the specific performance of the BDM, CDM or PDS can be tested instead of testing its sub-components. GR 12668.3--2003/1EC 61800-3: 19965. 1.1 Acceptance criteria (performance criteria)
The performance of a PDS against external disturbances shall be checked using acceptance criteria. From an EMC point of view, any equipment shall be able to operate normally according to Figure 1. Since a DS is part of a larger production process + functional sequence, the impact on this production process caused by changes in the performance of the PDS is difficult to predict. The main function of the PDS is to convert electrical energy into mechanical energy and the information processing required for this conversion. For each of these functions, the performance of the sub-components is divided into three parts: - the operation of the electric, electronic and drive circuits; - the information processing and detection functions;
- the operation of the display and control panel.
In Table 1, three acceptance (performance) criteria are divided according to the impact of a given disturbance: A, C, each of which defines a specific performance level.
Note 1: Acceptance criteria C
The function can be restored under the intervention of personnel (manual reset). For grid-commutated inverters operated in the inverter mode, the fuse is allowed to blow: Note 2 Acceptance criteria A, H.7
No false start is allowed. False start refers to an unexpected change from the remote state\ST(PPED stop>\, which may accelerate the motor operation. Table 1 Inspection of PES anti-electromagnetic interference acceptance criteria: Special performance, general specific performance: Special overrun characteristics, component performance, no obvious change in the above operating characteristics, normal operation within the specified tolerance, torque deviation within the specified tolerance, power electronic circuit and drive circuit! Power semiconductor device operation, component performance: Information processing and detection function, component performance: Display and control interface transmission, communication and data exchange with external devices without interference, 1, D The display signal has no change, only a slight attenuation of the brightness, or there is a change in the performance of the sub-component or specific performance. The operating characteristics have obvious (visible: shutdown, operating characteristics change or audible) changes. The dynamic conversion deviation exceeds the specified value. It can recover automatically. Temporary surface wear will not cause the drive system to shut down. Temporary communication interference will not be issued. Error reports that may cause internal and external devices to shut down will not be issued. There are visible temporary changes in information. 1.E Unsatisfactory brightness
: Protection device triggered (see 5.1.1 Note 1) |Self-recovery
Torque loss
Unable to recover
Shutdown, protection device triggered (see
5.1.1 1)
Unable to recover
Communication link error, data and information loss
Unable to recover
Information is permanently lost or not allowed
The above operation
The information shown is obviously wrong
The general specific performance items in Table 1 should be determined based on the specific application and typical configuration of the PDS. The selection of these items is the responsibility of the manufacturer.
If the PDS cannot be put into use at the test site due to limitations in the size of the PDS, or due to limitations in current or rated power supply capacity, or limitations in load conditions, the sub-component acceptance criteria should be used to test the sub-components. In any case, the test device shall be able to withstand the highest intensity disturbance applied to the PDS or sub-component under test. According to Table 1, specific performance items shall be tested by component performance tests in the following two cases: not very applicable;
GB 12668.3—2003/IEC 61800-3:1996 - due to technical and economic reasons, it is not applicable (e.g. for large and/or complex PDS with separate functional units). Information processing and detection functions (including selected auxiliary equipment, if any) shall be tested only if the relevant ports or interfaces are present in the PDS. According to Table 1, in the case of the presence of these functions, sub-component performance tests are sufficient to determine compliance with this standard.
Short-circuit characteristics This special system performance shall only be tested if explicitly required by the user. In this case, the torque characteristics can be tested in two ways: direct or indirect. The direct test method uses an anti-EMC torque measuring instrument to measure the change in torque. The indirect test involves current performance. When determining the total torque inertia, an indirect test using the current and speed characteristics can be used: the torque performance can be determined by the ability to keep the current or speed constant within a specified tolerance after the disturbance is applied (see 5.1.3). 5.1.3 Test conditions
A light load test can be used. For example, in the case of internal gate drive circuits, external disturbances may cause faults (such as short circuits between two arms of the same phase or triggering of discharge circuits that should not occur) despite very low output currents. The same applies to any electronic or microcomputer controlled equipment.
If full load testing is required (as a specified item of the combination), specific performance tests should be used and the tests should be carried out as a complete set of units on the BDM, see Annex A.3. Testing the torque characteristics and the information processing and detection functions requires special test equipment that has an appropriate immunity to the parasitic components of the test disturbance. This test may only be carried out if the immunity of the test equipment can be verified by standard measurements. The evaluation of the torque disturbance can be carried out by means of a torque sensor, or by measuring or calculating the torque-induced current, or by other indirect techniques. Appropriate disturbance loads should be provided at the test site. In order to test the information processing or detection functions, appropriate equipment should be provided to simulate data communication or data calculation. The equipment should have sufficient immunity to interference so that it can work normally during the test. Since the motor has been tested by its manufacturer in accordance with the relevant standards, the motor part of the PDS does not require any additional EMC immunity testing, except for the detection element. Therefore, although the motor is connected to the IDM/CDM during the test, the motor itself does not need to be tested for EMC immunity. The relevant terminals, including those of the selected auxiliary equipment (if any), are tested port by port in a well-defined and reproducible manner. However, if there are several process quantity and control terminals or signal interfaces with the same physical configuration (distribution), it is necessary to test each port or interface of this type. The minimum requirements, test and acceptance criteria are described in the following clauses. For acceptance criteria, please refer to 5.1.1. 5.2 Basic immunity requirements - low-frequency strong interference The requirements given in the following clauses shall be applied when designing the immunity of a PDS to low-frequency disturbances. Each manufacturer may verify compliance with the requirements by tests, calculations or simulations. The results shall be given as the technical description of its product. When designing a basic drive module (3M) according to the specified functional level, the immunity level adopted shall be at least equal to the compatibility level corresponding to the normal operation of its system in accordance with the following clauses. The compatibility level between two systems connected to the same connection point (FCC) is determined according to the voltage. For fair voltage systems connected to the public connection point (FCC), the maximum compatibility level is given in IEC6ID0G-2-2, and for industrial low-voltage power supply systems connected to the connection point (PC), see IF61C00-2-4. Appendix Table A.1 gives a summary of practical specifications. 5.2.1 Harmonics and commutation notches/voltage variations Under steady-state conditions, the immunity level of the design related to the number of harmonics of the total power domain variation shall be at least equal to the permanent compatibility level specified in IFCF02-4 (level 3, TI-10%) or FC510001-2-2 (TH-8%). The acceptance criterion is A, under transient conditions (less than: 15). The immunity level used in the design shall be at least 1.5 times the permanent compatibility level. The acceptance criterion required is,
According to 1EC:6 [00))-2-4 or [EC610002-2] The peak voltage calculated by the method of inter-spectral wave generated by the non-capacitive level has no physical meaning and cannot be used as an immunity level. However, for the power grid dedicated to power converters, the value of the harmonic distortion factor encountered may be higher than the maximum compatibility level specified in 1F:61C004 (for calculating harmonic distortion). For example, the immunity level A listed in 5.2.2.4 of G13:73859.1, if G13:73859.1 is required, 12668.3--2003/IEC 61800-3:1996. This higher level of immunity is recommended by users. Many converters have commutation gaps. The harmful effect of commutation gaps on PS may be far greater than its effect on total harmonic distortion obtained by the lazy analysis method. Therefore, the time domain analysis method is required for commutation gaps. The classification of commutation gaps can be found in Article 5.2.2.4 of GB/T38S9.1. It is also stipulated that commutation gaps are measured by depth (d. fraction of ULwm) and area (degrees). For commutation gaps of PDS used in the second environment, the immunity level used in the design should be equal to the immunity level B of GB/T 3859.1 (depth 40%, area 250% degree), unless the user specifies a higher immunity level. The acceptance test is A. Note that the stress caused by the spectral wave and the phase change gap will affect the electronic control part and some power components (such as the absorption circuit). Because the action of the electronic control part is instantaneous and the absorption circuit has a short thermal constant, even if there is such a situation, the test cycle for permanent operation does not need to exceed I. For further explanation, see Appendix B. 5.2.2 Voltage changes, fluctuations, voltage drops and short interruptions 5.2.2.1 Voltage fluctuations
The typical state of voltage fluctuations is shown in Figure 3 of IEC 61000-2-1. The amplitude of voltage fluctuations relative to the rated voltage of the PDS is listed in Table 1 of IEC 61000-2-4 (Level 2: ±10%, Level 3: ±10%.15%, duration: 1min). The design immunity level should reach acceptance level A. When the input voltage is lower than the rated voltage, the maximum mechanical load (speed and/or torque) rating can be reduced (see Table A, 4 in Appendix A.1.2).
5.2.2.2 Voltage dips - short interruptions
Voltage dips and short interruptions refer to the reduction of the supply voltage beyond the fluctuation range, the amplitude may be 10% to 10% (the remaining voltage is 90% to 0%) + and the duration is specified to be less than 1tmin (see IEC 61000-2-1). Even if the voltage drop is 30%-50% in amplitude and lasts for 3s-1.0s, such a drop may cause the loss of PDS conversion energy. Without detailed understanding of a production process, it is difficult to determine the impact of voltage drop (energy reduction) on this process: this impact is manifested in the system and rating aspects, and this impact is usually greatest when the power elements (including losses) are higher than the weak power rate.
To protect against voltage dips and short interruptions, the immunity level used in the design should meet the acceptance criteria (. The definition is shown in Table 1. In these cases, the manufacturer of the PIS should make information about the performance of the PIS available to the user: based on the current technical level, the performance of the PDS can be estimated by simple and reliable calculations based on its working mode and rated values. Therefore, it is not necessary to conduct tests for protection against positive voltage dips (which is uneconomical). However, in cases where there is a possibility of non-hazardous performance (see Chapter 1), the performance of the PDS during short interruptions can be verified by switching the power supply network on and off under standard operating conditions of the PDS (see Appendix B.4. 1). The following example illustrates this complex problem. Reducing the input voltage, even for a few seconds, may cause the fuses of a grid-commutated converter used in regenerative operation to blow. The immunity level can be simply and better determined by adapting the speed and torque tolerances to the performance of the production process (for example, wind and winches should be taken into account). If a simpler immunity level is required, it should be specified by the user. Modifications in immunity (such as use of 1.1S, standby generators, derating, etc.) may significantly increase the size and cost of the PDS and can reduce efficiency and power factor. Modes of operation such as automatic restarting may have safety effects. This is the responsibility of the installer or user and is not covered by this standard (see Chapter 7). 5.2.3 Voltage unbalance and frequency variations
5.2.3.1 Voltage unbalance
The voltage imbalance may be caused by a single-phase load in the three-phase system. The actual voltage imbalance is equal to the ratio of the power of the unbalanced single-phase load to the rated power of the three-phase network: the designed immunity level should be equal to the compatibility level of the connection point (P) under consideration, see Table 1 of IEC61000-2-44 (level 3: 3%) and Article 6 of IEC610002-2 (2%). For explanation, see Appendix R.3. 5.2.3.2 Frequency variation
Frequency variations can be compensated by electronic control within the limits of the compatibility level. The control chain may be the rate of change of the frequency variation. IFCf100-2-4 gives the compatibility level (level 3: ±2% or ±4% for ten independent power supply networks), and the corresponding rates of change are 1%/5 and 2%/s, respectively, or see Article 8 of IEC61000-2-2 (±1Hz).
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.