大家一起学标准之IEC61400-1(5)
点击听全文，今天大家继续一起学IEC61400-1。
3.41 rated power 额定功率
quantity of power assigned, generally by a manufacturer, for a specified operating condition of a component, device or equipment.
一般由设备制造商给定，部件、装置或设备在规定运行工况下对应的功率标称值。
Note 1 to entry: For a wind turbine, it is the maximum continuous electrical power output which a wind turbine is designed to achieve under normal operating and external conditions.
注释 1：对于风力发电机组，额定功率指机组在正常运行及外部环境条件下，设计可稳定输出的最大电功率。
3.42 rated wind speed 额定风速 \(V_r\)
minimum wind speed at hub height at which a wind turbine's rated power is achieved in the case of steady wind without turbulence.
无湍流稳态风况下，轮毂高度处风机刚好输出额定功率的最低风速。
3.43 Rayleigh distribution 瑞利分布 \(P_R\)
probability distribution function.
一种概率分布函数。
Note 1 to entry: See 3.68.
注释 1：参见 3.68 条款。
3.44 reference wind speed 参考风速 \(V_{ref}\)
basic parameter for wind speed used for defining wind turbine classes.
用于划定风机等级的基础风速参数。
Note 1 to entry: Other design related climatic parameters are derived from the reference wind speed and other basic wind turbine class parameters (see Clause 6).
注释 1：其余设计相关气候参数均由参考风速与其他风机等级基础参数推导得到（见第 6 章）。
Note 2 to entry: A turbine designed for a wind turbine class with a reference wind speed Vref is designed to withstand climates for which the extreme 10 min average wind speed with a return period of 50 years at turbine hub height is lower than or equal to Vref.
注释 2：以参考风速Vref型设计的风机，可适配轮毂高度处 50 年重现期 10 分钟平均极端风速不大于Vref的气候环境。
3.45 resistance partial safety factor 抗力分项安全系数 \(\gamma_M\)
factor which takes account of possible unfavourable deviations/uncertainties of the material strength parameters and of the resistance model including bias in the resistance model.
该系数用于考量材料强度参数、抗力计算模型存在的不利偏差与不确定性，同时包含抗力模型自带的系统偏差。
3.46 rotationally sampled wind velocity 旋转采样风速
原文：wind velocity experienced at a fixed point of the rotating wind turbine rotor.
旋转的风机风轮上某一固定质点所感受到的风速。
Note 1 to entry: The turbulence spectrum of a rotationally sampled wind velocity is distinctly different from the normal turbulence spectrum. While rotating, the blade cuts through a wind flow that varies in space. Therefore, the resulting turbulence spectrum will contain sizeable amounts of variance at the frequency of rotation and harmonics of the same.
注释 1：旋转采样风速的湍流谱与常规湍流谱存在明显区别；叶片旋转过程中扫掠空间分布不均的流场，最终形成的湍流谱会在风轮旋转频率及其倍频处产生较大的方差分量。
3.47 rotor speed 风轮转速
rotational speed of a wind turbine rotor about its axis.
风机风轮绕自身旋转主轴的转动速度。
3.48 roughness length 地表粗糙度长度 \(z_0\)
extrapolated height at which the mean wind speed becomes zero if the vertical wind profile is assumed to have a logarithmic variation with height.
假定风速沿高度呈对数廓线分布时，将风速廓线外推至平均风速为零对应的虚拟高度。
3.49 safe-life 安全寿命
design property for a critical system which is either very difficult to repair or may cause severe damage to life and property.
针对检修难度大、失效后易造成重大人身与财产损失的关键系统所设定的设计属性。
Note 1 to entry: Such systems are designed to work for the full system lifetime without requirement of any repairs or inspections.
注释 1：此类系统的设计要求为：在整机全寿命周期内无需开展任何维修与检查作业。
3.50 safety integrity level 安全完整性等级（SIL）
discrete level (one out of a possible four), corresponding to a range of safety integrity values for the control functions, where 4 and 1 belong to the highest and lowest levels, respectively.
分为四档的离散等级，对应控制功能不同区间的安全完整性数值，其中 SIL4 为最高等级，SIL1 为最低等级。
Note 1 to entry: Target failure measures for the four safety integrity levels are defined in Tables 2 and 3 of IEC 61508-1:2010. These levels can be used for specifying safety integrity requirements of safety functions allocated to the systems. A SIL is not a property of a system, subsystem, element or component. As defined in IEC 61508-1, the phrase "SIL n safety-related system" (where n is 1, 2, 3, or 4) means that the system is potentially capable of supporting safety functions with a safety integrity level up to n.
注释 1：IEC 61508-1:2010 表 2、表 3 规定了四类安全完整性等级对应的目标失效指标；该等级用于规定分配至系统的安全功能的完整性要求。SIL 并非系统、子系统、元器件本身的固有属性；依据 IEC 61508-1 定义，“SIL n 级安全相关系统”（n 取 1、2、3、4）代表该系统最高可承载对应 n 等级的安全功能。
3.51 scheduled maintenance 定期维护
preventive maintenance carried out in accordance with an established schedule.
按照既定计划表执行的预防性维护作业。
3.52 secondary layer protection function 次级保护功能
dedicated protection function which operates using a layer of monitoring and logic separate from a primary layer protection function (3.39) with a similar purpose.
拥有独立监测与逻辑回路的专用保护功能，和 3.39 条款的主层级保护功能防护目标一致，二者相互独立冗余。
3.53 site data 场址数据
environmental, seismic, soil and electrical network data for the wind turbine site.
风机场址对应的环境、地震、岩土以及电网相关实测资料。
Note 1 to entry: Wind data shall be the statistics of 10 min samples unless otherwise stated.
注释 1：若无特殊说明，风况数据均采用 10 分钟采样的统计值。
3.54 standstill 静止停机状态
condition of a wind turbine that is stopped.
风机风轮完全停止转动的运行状态。
3.55 support structure 支撑结构
part of a wind turbine comprising the tower and foundation.
由塔筒与基础共同构成的风机支承体系。
3.56 survival wind speed 生存风速
maximum wind speed that a construction is designed to withstand.
结构设计所能承受的最大风速。
Note 1 to entry: This is a popular expression that is not used in this document. Design conditions instead refer to extreme wind speed (3.19).
注释 1：该词汇仅为行业俗称，本标准不予采用，设计工况统一使用 3.19 条款定义的极端风速。
3.57 swept area 扫掠面积
原文：projected area perpendicular to the wind direction that a rotor will describe during one complete rotation翻译：风轮旋转一周，叶片在垂直于来流风向平面上扫掠形成的投影总面积。
3.58 turbulence intensity 湍流强度 I
ratio of the wind speed standard deviation to the mean wind speed, determined from the same set of measured data samples of wind speed, and taken over a specified period of time.
同一组风速实测样本、规定时长内，风速标准差与平均风速的比值。
3.59 turbulence scale parameter 湍流尺度参数
wavelength where the non-dimensional, longitudinal power spectral density is equal to 0,05.
无量纲纵向功率谱密度等于 0.05 时所对应的波长数值。
Note 1 to entry: The wavelength is thus defined as
注释 1：因此该波长定义为：
该部分为 IEC 61400-1:2019 第 3 章术语，规范了风机额定参数、风场基础参数、结构抗力系数、旋转流场特性、安全寿命与 SIL 安全等级、主次两级保护机制、场址勘测数据、湍流特征参数等专业定义，为风机载荷计算、安全系统设计、风资源实测分析提供统一的术语基准。
