TRANSISTOR RELAY CIRCUITWALTER J. IVES
6、距离保护的起动元件采用负序、零序增量元件有何有点?①灵敏度高; ②可见做振荡闭锁装置的起动元件; ③在电压二次回路断线时不会误动; ④对称分量的出现于故障的相别无关,故起动元件可采用单个继电器,因此比较简单。7、保护装置符合哪些条件可评定位一类设备?一类设备的所有保护装置,其技术状况良好,性能完全满足...
(一)配电线路 配电线路是指从供电设备到用电设备之间的连接导线。 (二)架空配电线路 一般架空配电线路是指10千伏及以下电压的架空配电线路。1~10千伏架空配电线路为高压配电线路,1千伏以下的架空配电线路为低压配电线路(电业安全工作规程中高、低压是以1千伏为界限而分类的) 。 (三)接户线、进户线 从配电线路至...
transistor-transistor logic 集成电路输入级和输出级全采用晶体管组成的单元门电路。简称TTL电路。它是将二极管-晶体管逻辑电路(DTL)中的二极管,改为使用多发射极晶体管而构成。TTL电路于1962年研制成功,基本门电路的结构和元件参数,经历了3次大的改进。同DTL电路相比,TTL电路速度显著提高,功耗大为降低。仅第一代TTL...
The control circuit for the control transistor includes a capacitance divider, one element of which is the distributed capacitance of the control transis- tor; a resistor and a zener diode. The control circuit com- ponents are integrated into the thyristor chips. Each of the two identical ...
coil,sothatthecontactsattractandmakethe externalpowersupplydrivetheexternalloadthroughthe closedcontacts.Theopencircuitleakagecurrentiszero,and theresponsetimeisslow(about10ms). ThetransistoroutputtypeprincipleisthattheCPUswitches onandoffthroughtheoptocouplertocontroltheexternalDC load,andtheresponsetimeisfast(...
Relay and solenoid driver circuit doubles supply voltage to conserve sustaining power when driving the device into an actuation state.
An electronic circuit will normally need a relay driver using a transistor circuit stage in order to converter it’s low power DC switching output into a high power mains AC switching output. However the low level signals from an electronic which may be derived from an IC stage or a low cu...
Focuses on a relay driver circuit, which is often extended in redundant systems by paralleling two transistor switches driven by separate controllers. Comp... Willis,Scott,C.,... - 《Electronic Design》 被引量: 0发表: 1997年 A Relay Drive Circuit for a Safe Operation Order and its Fail-sa...
The contacts on electromechanical relays tend to be larger and more robust than some other relay types. The larger contacts give them the ability to withstand unexpected surge currents caused by parasitic capacitances present in your circuit, cables, etc. An unfortunate tradeoff, however, is that ...