Adjustable speed electrical power drive systems - Part 2: General requirements - Rating specifications for low voltage adjustable frequency a.c. power drive systems
1 General
1.1 Scope and object
This part of GB/T 12668 applies to general purpose adjustable speed a.c. drive systems which include power conversion, control equipment, and also an a.c. motor or motors. Excluded are traction and electrical vehicle drives.
This part applies to systems connected to line voltages up to 1 kV a.c., 50 Hz or 60 Hz, and load side frequency up to 600 Hz.
EMC aspects are covered in IEC 61800-3.
This part gives the characteristics of the converters and their relationship with the complete a.c. drive system. It also states their performance requirements with respect to ratings, normal operating conditions, overload conditions, surge withstand capabilities, stability, protection, a.c. line earthing, and testing. Furthermore, it deals with application guidelines, such as control strategies, diagnostics, and topologies.
This part is intended to define a complete a.c. PDS in terms of its performance and not in terms of individual subsystem functional units.
1.2 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 2900.18-1992 Electrotechnical Terminology — Low Voltage Apparatus (eqv IEC 60050-441:1984)
GB/T 3859.1-1993 Semiconductor Convertors — Specification of Basic Requirements (eqv IEC 60146-1-1:1991)
GB/T 3859.2-1993 Semiconductor Convertors — Application Guide (eqv IEC 60146-1-2:1991)
GB/T 3859.3-1993 Semiconductor Convertors — Transformers and Reactors (eqv IEC 60146-1-3 :1991)
GB 4208-1993 Degrees of Protection Provided by Enclosure (IP Code) (eqv IEC 60529:1989)
GB/T 5226.1-1996 Electrical Equipment of Industrial Machines — Part 1: General Requirements (eqv IEC 60204-1:1992)
GB/T 16935.1-1997 Insulation Coordination for Equipment within Low-voltage Systems — Part 1: Principles Requirements and Tests (idt IEC 60664-1:1992)
IEC 60034-1:1994 Rotating Electrical Machines — Part 1: Rating and Performance
IEC 60034-2 :1972 Rotating Electrical Machines — Part 2: Methods for Determining Losses and Efficiency of Rotating Electrical Machinery from Tests (Excluding Machines for Traction Vehicles)
IEC 60034-9:1990 Rotating Electrical Machines — Part 9: Noise Limits
IEC 60038 1983 IEC Standard Voltages
IEC 60050-111:1996 International Electrotechnical Vocabulary (IEV) — Chapter 111: Physics and Chemistry
IEC 60050-151:1978 International Electrotechnical Vocabulary (IEV) — Chapter 151: Electrical and Magnetic Devices
IEC 60050-551:1998 International Electrotechnical Vocabulary (IEV) — Chapter 551: Power Electronics
IEC 60050-601:1985 International Electrotechnical Vocabulary (IEV) — Chapter 601: Generation, Transmission and Distribution of Electricity — General
IEC 60076 Power Transformers
IEC 60721-3-1:1987 Classification of Environmental Conditions — Part 3: Classification of Groups of Environmental Parameters and Their Severities — Section 1: Storage
IEC 60721-3-2:1987 Classification of Environmental Conditions — Part 3: Classification of Groups of Environmental Parameters and Their Severities — Section 2: Transportation
IEC 60721-3-3:1984 Classification of Environmental Conditions — Part 3: Classification of Groups of Environmental Parameters and Their Severities — Section 3: Stationary Use at Weatherprotected Locations
IEC 60747 Semiconductor Devices — Discrete Devices and Integrated Circuits
IEC 61000-2-4:1994 Electromagnetic Compatibility (EMC) — Part 2: Environment — Section 4: Compatibility Levels in Industrial Plants for Low-frequency Conducted Disturbances
IEC 61000-4-7:1991 Electromagnetic Compatibility (EMC) — Part 4: Testing and Measurement Techniques — Section 7: General Guide on Harmonics and Interharmonics Measurements and Instrumentation, for Power Supply Systems and Equipment Connected Thereto
IEC 61800-3:1996 Adjustable Speed Electrical Power Drive Systems — Part 3: EMC Product Standard Including Specific Test Method
IEC Guide 106:1989 Guide for Specifying Environmental Conditions for Equipment Performance Rating
1.3 Symbols
Table 1 lists symbols defined and/or used in this standard.
Table 1 Symbols
Parameter Symbol Unit Definition
Rated system voltage ULN V 2.4.1
Rated system frequency fLN Hz 2.4.2
Line-side converter rated a.c. voltage UVN V 2.4.3
Line-side rated a.c. current of the CDM/BDM ILN A 2.4.4
Rated input current of the converter IVN A 2.4.5
Line-side harmonic content HL V or A 2.4.6
Line-side total harmonic distortion THDL % 2.4.8
Converter input displacement factor cosφV1 2.4.9
Line side displacement factor cosφL1 2.4.10
Input total power factor λL 2.4.11
Maximum allowable a.c. system, symmetrical short-circuit current ISCM A 2.4.13
Short-circuit ratio RSC 2.4.13
Rated continuous output current IaN A 2.5.1
Overload current (overload capability) IaM A 2.5.2
Load side fundamental rated a.c. voltage IaN1 V 2.5.4
Base frequency fa Hz 2.5.5
Rated fundamental output current IaN1 A 2.5.6
Efficiency of drive system ηD % 2.5.7
Efficiency of CDM ηc % 2.5.7
Load side harmonic distortion THDa % 2.5.9
Slip s p.u. 2.7.5
Rated slip SN p.u. 2.7.6
Base speed NM r/min 2.7.7
Maximum operating speed NM r/min 2.7.8
Minimum operating speed Nmin r/mm 2.7.9
Maximum safe motor speed Nsmax r/mm 2.7.10
Torque M Nm
Inertia J kgm2
2 Definitions
For the purpose of this standard, the following definitions, as well as those given in IEC 60050-111, IEC 60050-151, GB/T 2900.18, IEC 60050-551, IEC 60050-601, GB/T 3859.1, GB/T 3859.2, GB/T 3859.3, and IEC 60147-0, apply.
2.1 System
2.1.1
a.c. power drive system (PDS) (see Figure 1)
System consisting of power equipment (composed of converter section, a.c. motor and other equipment such as, but not limited to the feeding section), and control equipment (composed of switching control –on/off for example–, voltage, frequency, or current control, firing system, protection, status monitoring, communication, tests, diagnostics, process interface/port, etc.)
2.1.2
a.c. power drive system – hardware configuration
PDS which consists of a complete drive module (CDM) and a motor or motors with sensors which are mechanically coupled to the motor shaft (the driven equipment is not included). See Figure 2 for hardware partition of the power drive system
2.1.2.1
Basic drive module (BDM)
Drive module which consists of a converter section, a control equipment for speed, torque, current, frequency or voltage, and a power semiconductor gating system, etc.
2.1.2.2
Complete drive module (CDM)
Drive system, without the motor and the sensors which are mechanically coupled to the motor shaft, consisting of, but not limited to, the BDM, and extensions such as feeding section, and auxiliaries.
2.1.2.3
Installation
Equipment or equipments which include at least both the PDS and the driven equipment.
2.2 Converters
2.2.1
Converter, general purpose
Operating unit for electronic power conversion, changing one or more electrical characteristics and comprising one or more electronic switching devices and associated components, such as transformers, filters, commutation aids, controls, protections and auxiliaries, if any.
2.2.2
Rectifying, rectification
Converter action converting from a.c. to d.c. The rectifier can be uncontrolled or controlled [IEV 551-11-06 modified].
Note: For the purpose of this standard, the line-side converter normally operates as a rectifier.
2.2.3
Inverting, inversion
Converter action converting from d.c. to a.c. [IEV 551-11-07 modified].
Note: For the purpose of this standard, the load-side converter normally operates as an inverter.
2.2.4
Converter, a.c.
Converter for changing a.c. power of a given voltage, frequency, and phase number to a.c. power in which one or more of these parameters are different.
2.2.5
Converter, adjustable frequency
Converter for changing frequency.
Foreword III
1 General
1.1 Scope and object
1.2 Normative references
1.3 Symbols
2 Definitions
2.1 System
2.2 Converters
2.3 Drive System Operating Characteristics
2.4 CDM, BDM and Converter Input Parameters
2.5 CDM, BDM and Converter Output Parameters
2.6 Converter Circuitry and Circuit Elements
2.7 Induction Motor Parameters
2.8 Control Systems
3 Functional Features
3.1 Operational
3.2 Fault Supervision
3.3 Minimum Status Indication Required
3.4 I/O Devices
4 Service Conditions
4.1 Installation and Operation
4.2 Storage of Equipment
4.3 Transportation
5 Ratings
5.1 BDM Input Ratings
5.2 BDM Output Ratings
5.3 Efficiency and Losses
5.4 Transformers and Reactors
6 Performance Requirements
6.1 Steady State Performance
6.2 Dynamic Performance
6.3 Dynamic Braking and Dynamic Slowdown
6.4 Other Performance Requirements
7 Tests
7.1 Classification of Tests
7.2 Performance of Tests
7.4 Items of Power Drive System Tests
7.5 Instrumentation for Performance Testing
8 Product Information
8.1 Marking
8.2 Information to be Supplied with the PDS or CDM/BDM
9 Safety and Warning Labels
9.1 Warning Labels
9.2 Safety and Nature of a PDS
Annex A (Informative) Motor Considerations
Annex B (Informative) Line-side considerations
Annex C (Informative) Auxiliary Equipment
Annex D (Informative) Control Strategies
Annex E (Informative) Protection
Annex F (Informative) Topologies
Annex G (Informative) Monitoring features
