额定频率

额定频率及相数；

Rated frequency and the number of phases ;

频率是电力系统的一项重要指标，只有在额定频率范围内，系统和其中的各种电力设备才能够安全，稳定的运行。

Frequency is one of the most important operational parameters of power system . Only with the rated frequency can the electrical devices work efficiently and safely .

推导出一种在定间隔采样基础上能够有效消除非额定频率下离散傅里叶变换（DFT）算法产生的频率泄漏影响的相量校正算法。

Based on the fixed sampling interval technique , an improved phasor computing algorithm is proposed to correct the errors caused by DFT in the presence of frequency offset .

利用该算法，可使电力系统频率在偏离额定频率±2Hz时，基波幅值计算结果的误差<0.5%，相角误差也明显减少。

With this algorithm , when the power system frequency has a bias of ± 2 Hz from the normal frequency , the calculational error for the basic wave amplitude is limited to less than 0.5 % , and the phase error is reduced significantly as well .

电网电源频率的变化或者使用变频器作为变频电源对异步电动机进行调速运行都是属于异步电动机在非额定频率下运行.有时候，在引进的各种各样机电产品中部分设备的驱动电动机系采用60Hz的电源。

Both the variation of mains power frequency and use of frequency converters as frequency-converting power source to do governing operation for asynchronous motor are called the operation of asynchronous motor at non-rated frequency . Some driving motors integrated in various imported machines and equipment run on 60 Hz power .

GB/T4988-1985船舶和海上石油平台用电工产品的额定频率、额定电压、额定电流

" Ratings of frequency , voltage and current of electric products for ships and offshore units "

异步电动机非额定频率下运行对其性能的影响与分析

MARINE ELECTRICITY - An Analysis on Effects of Running an Asynchronous Motor at Non-rated Frequency on its Performance

额定频率为50赫的低压开关电器可以应用于60赫的电路中，在60赫时较之50赫时，能开断较大的电流，其开断时间较短。

Low-voltage circuit-breakers of rated frequency50Hz may be used in the circuit of60Hz while at60Hz the cutoff current is higher and the breaking time is less than that of at50Hz .

机体内部的电路主要是为了激发压电陶瓷产生额定频率，而提供压电陶瓷要求的高电压及振荡信号。

The function of the inner circuit is for activating the transducer to produce the fixed frequency , and providing the high voltage and the signal of vibration for transducer .

对频率敏感的设备应在其额定频率下对其进行测定。设备上还要标明不只一个能使设备温度最大限度增高的频率值。

Frequency-sensitive equipment shall be tested at rated frequency , and equipment marked with more than one frequency shall be tested at the frequency that will produce the maximum temperature rise .

首先，阐述了非额定频率下相量的定义以及数据再同步对相量时标的要求。

Some key issues of synchrophasor measurement are discussed in detail . First , the definition of phasor in the presence of frequency offset and the requirement on the time tag of data resynchronization are elaborated .

本文就异步电动机在非额定频率下运行时的性能影响进行了详细分析，其分析方法和结论也可推广到单相电动机和变压器设备。

This paper presents detailed analysis of the effect on the operation performance of asynchronous motor under non-rated frequency . It is POinted out that the analytical method and conclusions so obtained are also applicable to single-phase motor and transformer equipment .

包钢某厂二次除尘系统因2风机电机没有达到额定频率、额定转速运行，总除尘风量没有达到工艺要求，从厂房顶部外冒出的粉尘较大，严重污染环境。

NO.2 fan motor in Baotou Steel Factory secondary dedusting system did not work at rated frequency and rated speed , the total dedust air volume did not reach the technical requirement , the dust which drop from the plant is larger , and the environment pollution is serious .

由于变频调速电机的运行频率是可变的，而传统的感应电机的电磁计算程序都是在电机额定频率下进行计算的，并不完全适用低频和高频时的情况。

The operating frequency of variable frequency adjustable speed motor is variable , and the traditional electromagnetic calculation of induction motor is done at rated frequency , so the traditional calculation program is not suitable for the calculation of motor under the conditions of low frequency and high frequency .

即IC611。电动机允许在额定电压和额定频率下直接起动。

The motor is permitted to directly start in conditions of rated voltage and rated frequency .

介绍在实际选用中，影响接触器电寿命的四个因素：使用类别、额定电流、操作频率、使用环境。

This article introduces to affect four factors of electrical life of the contactor , that is usage category ; rated current ;

仿真计算滤波电容器额定参数等，并可在额定频率和频率偏差情况下进行滤波效益与参数校验工作。

Rated parameters of filter capacitors are simulated and determined ; and the filtering efficiency and parameter can be verified at rated frequency with and without deviation .