Particles called electrons come together, and the number of electrons flowing each second is the current. Difference between voltage and current Voltage is another term that’s used in regards to electronic circuits about as often as current. Voltage is measured in volts (V). Like current, ...
凯尔文电桥又称“双臂电桥”。测量10^(-6)~10^2欧姆低电阻的直流电桥。图中R是跨线电阻(包括Rx、Rs两电阻器间的接线电阻、接触电阻及内部连接线电阻),Rs是标准电阻。当调节R1、R2、R3、R4和Rs使桥路中无电流(即灵敏电流计G的指针不偏转)时,将有下列平衡条件成立:R1R2=R3R4和Rx=R1R2Rs。Rx的计算式与R...
Chapter 21 Electric Current and Direct-Current Circuitsconnected in series
当通电延时型时间继电器的电磁铁线圈1通电后,将衔铁吸下,于是顶杆6与衔铁间出现一个空隙,当与顶杆相连的活塞在弹簧7的作用下由上向下移动时,在橡皮膜上面形成空气稀薄的空间(气室),空气由进气孔逐渐进入气室,活塞因受到空气的阻力,不能迅速下降,在降到一定位置时,杠杆15使触头14动作(常开触点闭合,常闭触点断开)。
Electrical device according to the interruption of the electric current of the circuits of the operation of the elevators, by means of the opening of the doors of the cabin, or those of giving access to the stages, or switches safety
Chapter21ElectricCurrentandDirect-CurrentCircuits
stations includes primary equipment such as transformers, reactors, capacitors, circuit breakers, grounding switch, disconnectors, surge arresters, voltage transformers, current transformers, bus, and secondary equipment such as relay protection, surveillance, monitoring and control, and power communication ...
在机电一体化系统中,经常对许多传感器信号进行采集和控制。如果每一路都单独采用各自的输入回路(即每一路都采用放大、采样/保持、A/D等环节),不仅成本比单路成倍增加,还会导致系统体积庞大,且由于模拟器件、阻容元件参数和特性不一致,对系统的校准带来很多困难。因此除特殊情况下,多采用公共的采样/保持及A/D转换电...
常规变电站的二次回路有两种:直流回路和交流回路。直流回路的功能:控制、保护逻辑、信号。交流回路的功能:保护、测量、计量。 到了智能变电站时代,一次设备与保护、测控之间的电缆被光缆取代,电缆中传输的直流信号(正电压/负电压/地电压)和交流信号(CT、PT二次电流、电压)被网络中传输的报文取代,过去用于实现保护逻...
Miniature circuit breaker is applicable to electric circuits with rated voltage 230V/415V AC, Frequency 50/60Hz and rated current up to 63Amp. The product provides protection against overload and short circuit to electric circuits and equipments in househol...