Excitation systems for synchronous machines — Part 4: Technical requirements of excitation systems for medium and small synchronous machines
1 Scope
This document specifies the general requirements, service conditions, performance requirements of excitation systems for synchronous generators, performance requirements of excitation systems for synchronous machines, test rules, completeness of equipment, marking, packaging, transportation and storage, as well as mass production and quality assurance of excitation systems for medium and small synchronous machines.
This document is applicable to the design and manufacture of 50Hz and 60Hz excitation systems for synchronous machines in the following ranges:
— hydraulic generators below 10 000 kW;
— turbine-generators below 6 000 kW;
— internal combustion generators up to 3 200 kW;
— synchronous machines below 10 000 kW.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 191-2008 Packaging - Pictorial marking for handling of goods
GB/T 755 Rotating electrical machines - Rating and performance
GB/T 1094 (all parts) Power transformers
GB/T 3797-2016 Electrical control assemblies
GB/T 7409.1-2008 Excitation systems for synchronous electrical machines - Definitions
GB/T 7409.2-2020 Excitation systems for synchronous machines - Part 2: Models for power system studies
GB/T 18494.1-2014 Converter transformers - Part 1: Transformers for industrial applications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 7409.1-2008 and the following apply.
3.1
excitation system voltage time response
output voltage, expressed as a function of time, of excitation system under specified conditions
3.2
excitation system nominal response
ratio of excitation system output voltage growth rate to the rated field voltage as determined by the excitation system nominal response curve
Note: The excitation system output voltage growth rate is the growth rate of linear ac from the initial point of excitation system voltage time response (see Figure 1), and the area abc increased according to the first 0.5s (or otherwise specified) is the same as the area abd increased by the actual curve. See Equations (1) and (2):
Where,
P — the excitation system output voltage growth rate, in volts per second (V/s);
△UE — the increase of voltage, in volts (V);
VE — the excitation system nominal response, in per second (s-1);
UfN — the rated field voltage, in volts (V).
4 General requirements
In addition to meet the requirements of this document, excitation systems shall meet the requirements of GB/T 755. Excitation systems for synchronous machines shall also meet the requirements of GB/T 3797-2016.
Contents Foreword Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements 5 Service conditions 6 Performance requirements of excitation systems for synchronous generators 7 Performance requirements of excitation systems for synchronous machines 8 Test rules 9 Completeness of equipment 10 Marking, packaging, transportation and storage 11 Mass production and quality assurance Figure 1 Determination of nominal response ratio (VE) and response time (tg) of excitation system Table 1 Temperature rise limits of each part of excitation system Table 2 Test items of excitation systems for synchronous generators Table 3 Test items of excitation systems for synchronous machines
3.1 励磁系统电压-时间响应 excitation system voltage time response 在规定条件下，用时间的函数来表示的励磁系统输出电压。 3.2 励磁系统标称响应比 excitation system nominal response 由励磁系统标称响应曲线确定的励磁系统输出电压增长率与额定磁场电压的比值。 注：励磁系统输出电压增长率,是从励磁系统电压-时间响应曲线的初始点(见图1)，按照第一个0.5s内(或另有规定)增加的面积abc与实际曲线增加的面积abd相同,所做的直线ac增长率见公式(1)、公式(2)：
