1 Scope
This part of GB 12668 specifies electromagnetic compatibility (EMC) requirements for power drive systems (PDSs). A PDS is defined in 3.1. These are adjustable speed a.c. or d.c. motor drives. Requirements are stated for PDSs with converter input and/or output voltages (line-to-line voltage), up to 35 kV a.c. r.m.s.
PDSs covered by this part are those installed in residential, commercial and industrial locations with the exception of traction applications, and electric vehicles. PDSs may be connected to either industrial or public power distribution networks. Industrial networks are supplied by a dedicated distribution transformer, which is usually adjacent to or inside the industrial location, and supplies only industrial customers. Industrial networks can also be supplied by their own electric generating equipment. On the other hand, PDSs can be directly connected to low-voltage public mains networks which also supply domestic premises, and in which the neutral is generally earthed (grounded).
The scope of this part, related to EMC, includes a broad range of PDSs from a few hundred watts to hundreds of megawatts. PDSs are often included in a larger system. The system aspect is not covered by this part but guidance is provided in the informative appendixes.
The requirements have been selected so as to ensure EMC for PDSs at residential, commercial and industrial locations. The requirements cannot, however, cover extreme cases which may occur with an extremely low probability. Changes in the EMC behavior of a PDS, as a result of fault conditions, are not taken into account.
The object of this part is to define the limits and test methods for a PDS according to its intended use. This part includes immunity requirements and requirements for electromagnetic emissions.
Note 1: Emission can cause interference in other electronic equipment (for example radio receivers, measuring and computing devices). Immunity is required to protect the equipment from continuous and transient conducted and radiated disturbances including electrostatic discharges. The emission and immunity requirements are balanced against each other and against the actual environment of the PDS.
This part defines the minimum EMC requirements for a PDS.
Immunity requirements are given according to the environment classification. Low-frequency emission requirements are given according to the nature of the supply network. High- frequency emission requirements are given according to four categories of intended use, which cover both environment and bringing into operation.
This part may be used for the assessment of PDS. It may also be used for the assessment of CDM or BDM (see 3.1), which can be marketed separately.
This part contains:
- conformity assessment requirements for products to be placed on the market;
- recommended engineering practice for cases where high frequency emissions cannot be measured before the equipment is placed on the market (such PDSs are defined in 3.2.6 as category C4).
Note 2: The first edition of this part identified that the intended use could require engineering for putting into service. This was done by the "restricted distribution mode". Equipment that used to be covered by the "restricted distribution mode" is covered in the second edition by categories C2 and C4 (see 3.2).
This part is intended as a complete EMC product standard for the EMC conformity assessment of products of categories C1, C2 and C3, when placing them on the market (see definitions 3.2.3 to 3.2.5).
Radio frequency emission of equipment of category C4 is only assessed when it is installed in its intended location. It is therefore treated as a fixed installation, for which this part gives rules of engineering practice in 6.5 and appendix E, although it gives no defined emission limits (except in case of complaint).
This part does not specify any safety requirements for the equipment such as protection against electric shocks, insulation co-ordination and related dielectric tests, unsafe operation, or unsafe consequences of a failure. It also does not cover safety and functional safety implications of electromagnetic phenomena.
In special cases, when highly susceptible apparatus is being used in proximity, additional mitigation measures may have to be employed to reduce the electromagnetic emission further below the specified levels or additional countermeasures may have to be employed to increase the immunity of the highly susceptible apparatus.
As an EMC product standard for PDSs, this part takes precedence over all aspects of the generic standards and no additional EMC tests are required or necessary. If a PDS is included as part of equipment covered by a separate EMC product standard, the EMC standard of the complete equipment applies.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2900.83-2008 Electrotechnical Terminology – Electrical and Magnetic Devices (IEC 60050-151:2001, IDT)
GB/T 4365-2003 Electrotechnical Terminology – Electromagnetic Compatibility (idt IEC 60050(161):1990)
GB/T 12668.1-2002 Adjustable Speed Electrical Power Dive Systems – Part 1: General Requirements – Rating Specifications for Low Voltage Adjustable Speed D.C Power Drive Systems (IEC 61800-1:1997, IDT)
GB/T 12668.2-2002 Adjustable Speed Electrical Power Drive Systems – Part 2: General Requirements – Rating Specifications For Low Voltage Adjustable Frequency A.C. Power Drive Systems (IEC 61800-2:1998, IDT)
GB/T 12668.4-2006 Adjustable Speed Electrical Power Dive Systems – Part 4: General Requirements – Rating Specifications for A.C. Power Drive Systems above 1 000 V A.C. not Exceeding 35 kV (IEC 61800-4:2002, IDT)
GB/T 17626.3-2006 Electromagnetic Compatibility – Testing and Measurement Techniques – Radiated Radio-frequency Electromagnetic Field Immunity Test (IEC 61000-4-3:2002, IDT)
GB/T 17626.8-2006 Electromagetic Compatibility – Testing and Measurement Techniques – Power Frequency Magnetic Field Immunity Test (IEC 61000-4-8:2001, IDT)
GB/Z 17625.5-2000 Electromagnetic Compatibility – Limits – Assessment of Emission Limits for Fluctuating Loads in MV and HV Power Systems (idt IEC 61000-3-7:1996)
GB/Z 17625.6-2003 Electromagnetic Compatibility – Limits – Limitation of Emission of Harmonic Currents in Low-voltage Power Supply Systems for Equipment with Rated Current Greater than 16A (IEC TR 61000-3-4:1998, IDT)
GB/Z 18039.5-2003 Electromagnetic Compatibility – Environment – Electromagnetic Environment for Low-frequency Conducted Disturbances and Signalling in Public Power Supply Systems (IEC 61000-2-1:1990, IDT)
IEC 60050-131:2002 International Electrotechnical Vocabulary (IEV) – Chapter 131: Circuit Theory
IEC 60146-1-1:1991 Semiconductor Convertors – General Requirements and Line Commutated Convertors – Part 1-1:Specifications of Basic Requirements
IEC 60364-1:2001 Electrical Installations Of Buildings – Part 1: Fundamental Principles, Assessment of General Characteristics, Definitions
IEC 60664-1:1992 Insulation Coordination for Equipment within Low-Voltage Systems – Part 1:Principles, Requirements And Tests
IEC 61000-1-1 Electromagnetic Compatibility (EMC) – Part 1:General – Section 1: Application and Interpretation of Fundamental Definitions and Terms
IEC 61000-2-2:2002 Electromagnetic Compatibility (EMC) – Part 2: Environment – Section 2: Compatibility Levels for Low-Frequency Conducted Disturbances and Signalling in Public Low-Voltage Lower Supply Systems
IEC 61000-2-4:2002 Electromagnetic Compatibility (EMC) – Part 2: Environment – Section 4: Compatibility Levels in Industrial Plants for Low-Frequency Conducted Disturbances
IEC 61000-2-6:1995 Electromagnetic Compatibility (EMC) – Part 2: Environment – Section 6: Assessment of the Emission Levels in the Power Supply of Industrial Plants as Regards Low-Frequency Conducted Disturbances
IEC 61000-3-2:2000 Electromagnetic Compatibility (EMC) – Part 3: Limits – Section 2: Limits for Harmonic Current Emissions (Equipment with Input Current ≤ 16 A per Phase)
IEC 61000-3-3:1994 Electromagnetic Compatibility (EMC) – Part 3-3: Limits – Limitation of Voltage Changes, Voltage Fluctuations and Flicker in Public Low-Voltage Supply Systems for Equipment with Rated Current ≤ 16 A per Phase and Subject to Conditional Connection
IEC 61000-3-11:2000 Electromagnetic Compatibility (EMC) – Part 3-11: Limits – Limitation of Voltage Changes, Voltage Fluctuations and Flicker in Public Low-Voltage Supply Systems for Equipment With Rated Current ≤ 75 A and Subject to Conditional Connection
IEC 61000-4-2 Electromagnetic Compatibility (EMC) – Part 4-2: Testing and Measurement Techniques – Electrostatic Discharge Immunity Test Basic EMC Publication
IEC 61000-4-4:1995
Amendment 1 (2000)
Amendment 2 (2001) Electromagnetic Compatibility (EMC) – Part 4: Testing and Measurement Techniques – Section 4: Electrical Fast Transient/Burst Immunity Test – Basic EMC Publication
IEC 61000-4-5:1995 Electromagnetic Compatibility (EMC) – Part 4: Testing and Measurement Techniques – Section 5: Surge Immunity Test
IEC 61000-4-6:2003 Electromagnetic Compatibility (EMC) – Part 4-6: Testing and Measurement Techniques – Immunity to Conducted Disturbances, Induced by Radio-Frequency Fields
CISPR 11 Industrial, Scientific and Medical (ISM) Radio-Frequency Equipment – Electromagnetic Disturbance Characteristics – Limits and Methods of Measurement
CISPR 14 Electromagnetic Compatibility – Requirements for Household Appliances, Electric Tools and Similar Apparatus
CISPR 16-1 Specification for Radio Disturbance and Immunity Measuring Apparatus and Methods – Part 1: Radio Disturbance and Immunity Measuring Apparatus
CISPR 212:2003 Information Technology Equipment – Radio Disturbance Characteristics – Limits and Methods of Measurement
3 Terms and Definitions
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Common Requirements
4.1 General Conditions
4.2 Tests
4.3 Documentation for the User
5 Immunity Requirements
5.1 General Conditions
5.2 Basic Immunity Requirements – Low-Frequency Disturbances
5.3 Basic Immunity Requirements – High-Frequency Disturbances
5.4 Application of Immunity Requirements - Statistical Aspect
6 Emission
6.1 General Emission Requirements
6.2 Basic Low-Frequency Emission Limits
6.3 Conditions Related to High-frequency Emission Measurement
6.4 Basic High-frequency Emission Limits
6.5 Engineering Practice
6.6 Application of Emission Requirements – Statistical Aspects
Appendix A (Informative) EMC Techniques
Appendix B (Informative) Low-frequency Phenomena
Appendix C (Informative) Reactive Power Compensation – Filtering
Appendix D (Informative) Considerations on High-frequency Emission
Appendix E (Informative) EMC Analysis and EMC Plan
Bibliography
