1 Scope
This part of GB/T 2820 specifies the principal characteristics of Alternating Current (a.c.) generators under the control of their voltage regulators when used in generating set applications. It supplements the requirements of GB 755-2008.
Note: At present no International Standard is available for asynchronous generators. When such an International Standard is published, this part will be revised accordingly.
This part applies to a.c. generators used in ac generating sets driven by reciprocating internal combustion (RIC) engines for land and marine use, excluding generating sets used on aircraft or to propel land vehicles and locomotives.
For some specific applications (e.g. essential hospital supplies, high-rise buildings), supplementary requirements may be necessary. The provisions of this part should be regarded as the basis for establishing any supplementary requirements.
For a.c. generating sets driven by other reciprocating-type prime movers (e.g. steam engines) the provisions of this part should be used as a basis for establishing these requirements.
2 Normative references
The following normative documents contain provisions which, through reference in this part of GB/T 2820, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply to this part.
GB 755-2008 Rotating electrical machines - Rating and performance (IEC 60034-1:2004,
IDT)
GB/T 2820.1-2009 Reciprocating internal combustion engine driven alternating current generating sets - Part 1: Application ratings and performance ( ISO 8528-1: 2005, IDT)
GB/T 2820.5-2006 Reciprocating internal combustion engine driven alternating current generating sets - Part 5: Generating sets ( ISO 8528-5: 2005, IDT)
GB 4343.1-2009 Electromagnetic compatibility - Requirements for household appliances electric tools and similar apparatus - Part 1: Emission ( IECCISPR 14-1:2005, IDT)
GB 17743-2007 Limits and methods of measurement of radio disturbance characteristics of electrical lighting and similar equipment (CISPR 15:2005, IDT)
3 Symbols, terms and definitions
For indications of technical data for electrical equipment, IEC uses the term "rated' and the subscript "N". For indications of technical data for mechanical equipment, ISO uses the term "declared" and the sub-script "r". Therefore, in this part, the term "rated" is applied only to electrical items. Otherwise, the term "declared" is used throughout.
An explanation of the symbols and abbreviations used in this Standard are shown in Table 1.
Foreword I
1 Scope
2 Normative references
3 Symbols, terms and definitions
4 Other requirements and additional regulations
5 Rating
5.1 General
5.2 Basic continuous rating (BR)
5.3 Peak continuous rating (PR)
6 Limits of temperature and temperature rise
6.1 Basic continuous rating
6.2 Peak continuous rating
7 Rated power and speed characteristics
8 Voltage characteristics
9 Parallel operation
10 Special load conditions
10.1 General
10.2 Unbalanced load current
10.3 Sustained short-circuit current
10.4 Occasional excess current capability
10.5 Telephone Harmonic Factor (THF)
10.6 Radio interference suppression (F)
11 Effect of electromechanical frequency of vibrations when sets operate in parallel
12 Asynchronous generators with excitation equipment
12.1 General
12.2 Sustained short-circuit current
12.3 Range of voltage setting
12.4 Parallel operation
13 Operating limit values
14 Rating plate
Annex A (Normative) Transient voltage characteristic of an a.c. generator following a sudden change in load
