查询词典 transient

The inverse time delay characteristic is adopted by the basic zero-sequence over-voltage protection. On the basis of the analysis of the transient negative current, a compensated voltage can be generated with multiplying the rms value of the negative sequence transient current of the feeder by a settable compensated reactance, then combined with the magnitude of the zero-sequence voltage to consist of the compounded compensated voltage, which can be utilized to revise the characteristics of the inverse time-delay.

其基本保护采用零序过电压保护，动作时间采用反时限特性；在分析接地故障负序暂态电流分布特点的基础上，利用线路负序电流暂态有效值与一个可整定的补偿电抗相乘，形成补偿电压，并与零序电压幅值合成复合补偿电压，利用该电压对基本的反时限动作特性曲线进行修正，使零序过电压保护具有选择性。

Under the demand of wrecking-drainage system in different gradient deep mines, a mathematics model for analyzing the hydraulic transient of the sideling large-scale submersible motor pump drainage system is established, and the hydraulic transient of six different angles of the drainage system caused by power failure are calculated.

针对不同倾斜角度深部矿井中抢险排水的要求，建立了斜置大型潜水电泵排水系统水力过渡过程分析的数学模型，计算了6种不同矿井倾角排水系统的事故停机水力过渡过程。

In this paper, based on BPA, a software of power system analysis, through the calculations of power flow and transient stability for Zhejiang power system under some typical underexcited operating conditions, the results are revealed that underexcited operation reduces the margin of transient stability of the system.

本文基于BPA系统分析软件对浙江电网若干典型进相运行方式进行潮流分析和暂态稳定计算，结果表明发电机进相运行使系统暂态稳定性下降，但在系统内选择适当的大型发电厂在一定范围内作进相运行，对缓解系统低谷负荷时电压偏高问题是可行而有效的。

The just working frequency was obtained by calculation. By transient dynamics analysis applying piezoelectric coupling theory, the transient dynamics properties have been discussed. The analysis result provided a design reference on this kind of valveless piezoelectric pumps that use Cymbal actuators.

通过模态分析得到了Cymbal振子的前5阶固有频率和振型，选出其中最符合工作要求的频率和振型；通过瞬态分析，结合压电耦合分析，得到了振子在方波电压作用下的瞬态动力学特性。

Based on multi-conductor transmission lines and dipole method, a numerical method to predict the transient electromagnetic environments due to the operation of switches in air-insulated substation is proposed. After a model of busbars in a 500kV substation is set up, the transient electromagnetic field is predicted.

4提出了将多导体传输线时域有限差分法和电偶极子法相结合的空气绝缘变电站瞬态电磁环境数值预测方法，并对一座500kV变电站开关操作产生的瞬态电磁环境进行了预测计算，获得了可用于指导二次设备下放后其电磁屏蔽设计的关键数据。

Based on the transient simulation program of stator winding internal faults in synchronous generator, this paper presents the effect of stator winding and damper bar resistance on transient and steady currents. It is very necessary to calculate precisely the resistance of stator winding and damper bar resistance in order to simulate fault correctly.

应用同步发电机故障暂态仿真程序分析了定子和转子回路的电阻对发电机故障暂态过程的影响，结果表明为了准确进行发电机内部故障暂态过程计算，应该全面考虑影响的各种因素，准确求取定子和转子回路的电阻。

A transient thermal coupling model of certain internal combustion engine exhaust valve train was built, transient thermal-field distribution of the valve was simulated, and the effect of the thermal conductivity to the thermal-field was discussed.

通过建立某发动机排气门组瞬态热分析藕合模型，对排气门进行瞬态温度场有限元模拟，并探讨导热系数对气门温度场的影响。

Using the user-defined model function of PSASP, transient stability computation is carried out and different models of hydraulic system are taken into consideration. The effect of different hydro-turbine and conduit system models on transient stability computation is compared and analyzed.

利用电力系统分析综合程序提供的用户自定义模型接口功能，在多机系统暂态稳定计算中分别计入水力系统不同模型，分析了水轮机和输水系统不同模型对暂态稳定计算结果的影响。

Mine transient electromagnetic method is one of mainly geophysical methods, which are used to predict water inrush structures nearby the roof, bottom and driving face in roadway. Compared with ground transient electromagnetic method, this technique has many advantages: high resolution, small volume effect, flexibility and high efficiency. However, relatively slow development of its fundamental theory makes it become an immediate problem to be solved.

矿井瞬变电磁法勘探是预测巷道顶、底板和掘进工作面附近突水构造的主要物探方法之一，与地面瞬变电磁法勘探相比，该方法具有分辨率高、体积效应小、灵活和高效等优点；但其基础理论的发展却相对滞后，使之成为矿井瞬变电磁法勘探技术中亟待解决的问题。

The transient conditions of hydroturbines. It is the first time to apply this method to three hydro stations in this country for seek the law of dynamic flow changes in varions transient conditions of prototype tur- bines and results are satisfactorily attained.

结合实测结果，对水轮机动态流量与静态流量的关系、水轮机转速变化对动态流量变化规律的影响、水轮机动态流量变化规律与水轮机引水系统压力变化规律的关系以及过渡过程中水轮机动态效率的变化规律等，进行了理论分析。

Panorama Many people are dancing in a large sitting room.

在一个大客厅里，许多人在跳舞。

We fully understand how a microwave oven cooks food, it is first necessary to talk ...

我们充分理解一个微波炉煮的食物，这是首先要谈。。。