开关

In GIS, the switching of a disconnector will produce very fast transient overvoltage, which could damage the insulation of GIS and other connected equipments and produce electromagnetic interference into low voltage control systems.

气体绝缘金属封闭开关设备中隔离开关的操作会产生特快速暂态过电压，可能导致GIS本体及其相连的设备绝缘损坏，并可能产生电磁干扰，影响二次设备。

The concerned research works of VFTO is investigated.A new transient circuit model to the question of the steep front and high amplitude value of VFTO is proposed based on general transient circuit model. The numeric simulation that disconnector switched off short bus has been proceeded by using above circuit model and the comparison of results with the one based on EMTP are given.

首先针对操作GIS中隔离开关所产生的快速暂态过电压上升时间短及幅值高的特点，在一般暂态电路模型的基础上提出了新的暂态电路模型，并利用该模型，对GIS中隔离开关切断短母线的等值电路进行了数值模拟，并与电磁暂态程序的计算结果进行了比较。

FGX3 Jiggle button swich AC3816A,widely used in the disjunctor of VSI,DW-5 as the accessorial swich.

FGX3□型微动按钮开关AC380V 16A，广泛用于VS1、DW-50型等断路器中作辅助开关。

This plan has been applied to GT4850 type switching power supply of 18-information-shift-frequency-power-supply-pannel and get expectable purpose.

实践证明，高功率因数加上软开关技术是改善开关电源功率因数并提高效率的有效方法。

Power-source programmed switch can cut off in between and cut in both the left and right which can be used as extinctive switch.

Z 电源程序开关，中间断开，左右均接近，可作消防开关。

The equipment can compensates reactive and eliminate harmonic incurrent of distribution network, the main topology of equipment includes an inverter circuit and a DC capacitance.

因为配网侧电压相对较低，电路中可以采用开关速度高的IGBT作为开关元件，控制方式可采用直接电流控制，本文介绍的单周控制有源电力滤波器本质就是属于直接电流控制方法的范围。

Indirected the basic theory of the current, flux, position of the switched reluctance drive based on the flux method. proposed a position sensorless technique for SRD with energy optimizing strategy. Presented an mathematical method of the average torque maximization. Matlab simulated optimal switching angle at different speed, and verified by experiment.

为了便于转子位置信息检测，首先讨论了开关磁阻电机电流－磁链－位置关系的基本原理，给出了一种基于能量优化的磁链法的间接位置检测方案，然后推导出平均转矩最大化的数学模型，并利用Matlab仿真出不同转速下的最优开关角，最后通过实验予以验证。

Compared with the active soft-switching technology, the passive method without additional , switching-component , inspectable measures and controlled recources has powerful predominance on additive cost , dependability, transpositional efficiency and performance-cost ratio.

在无源和有源两大类软开关技术中，不使用额外开关元件、检测手段和控制策略的无源方式在附加成本、可靠性、变换效率、性价比等方面占有较强优势。

The new type of optical switch, which is made with MEMS, has many advantages, such as small size, light weight, low consumption and high integralization.

随着光通信的日益发展，对光开关的技术要求也日益提高，利用MEMS技术制作的新型光开关具有体积小、重量轻、能耗低、集成化程度高等特点，从而日益成为研究的热点。

The new type of optical switch, which is made with MEMS, has many advantages, such as small size, light weight, low consumption and high integralization. Therefore, the research on the optical switch has become an object which more and more experts are hunting for.

随着光通信的日益发展，对光开关的技术要求也日益提高，利用MEMS技术制作的新型光开关具有体积小、重量轻、能耗低、集成化程度高等特点，从而日益成为研究的热点。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。