描述
描述
品牌:ALSTOM
型号:MVTU11K1CD0751G
产地:USA
质保:一年
联系方式:15383419322
邮箱:2970592941@qq.com
无论是在电压完全消失时,或处于电网内的短路故障弓|起电动机制动时,低电压保护的接线方式,应当能够保证将电动机断开。为此,低电压保护的
接线应满足以下几点要求:
1.能反映对称的和不对称的电压下降。因为在不对称短路时的电动机也可能被制动,因而当电压恢复时也会出现自启动问题。
2.电压互感器一次侧一相或两相断线,二次侧各相断线时(例如熔断时),保护装置不应误动作,并且发出信号。但在二次回路断线故障期间,如果这时厂用母线真正失去电压(或电压降到规定值时),低电压保护仍应正确动作。
3.电压互感器–次侧的隔离开关或隔离触头因误操作而被断开时,保护装置不应该误动作,并应发出信号。
4.0.5与9s的低电压保护的动作电压应分别整定。在电压消失时,用接在线电压上的一-只电压继电器构成的保护就能达到目的,并能可靠的反应三相短路。但当两相短路时,用-只电压继电器构成的保护,只有在接继电器的两相间发生短路时才能起作用,因而不能完全反应不对称的电压下降。为了保证在所有两相短路的情况下保护都能动作,可采用三相继电器接线方式。在同-段厂用母线供电的若干台电动机,通常共同装-套低电压保护装
置。电压继电器接在厂用母线的互感器上。
Our company’s main business:
Bentley, Invensys TRICONEX, Woodward, FOXBORO, WESTINGHOUSE, Ryan, Schneider, Modicom, ABB, AB, Motorola, GE Fanuc, YASKAWA Yaskawa, Bosch REXROIH, ACSO, YOKOGAWA, Dark Horse HIMA, EMERSON EMERSON, YOKOGAWA YOKOGAWA, Honeywell, Moore Moore, EPRO, ICS TRIPLEX, bachmann Bachmann and other major brands === = mainly do PLC DCS robot servo four systems of the discontinued spare parts module card parts driver
Our products are widely used in CNC machinery, metallurgy, petroleum and natural gas, petrochemical, chemical, paper printing, textile printing, machinery, electronic manufacturing, automobile manufacturing, tobacco, plastic machinery, electric power, water conservancy, water treatment/environmental protection, municipal engineering, boiler heating, energy, transmission and distribution industry.
person: Manager Cao Telephone: 15383419322 (Same number on WeChat) QQ number: 2970592941
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