current transformer, China manufacturer of current transformers,instrument transformer...

China Ningbo Electric Pneumatic: Current Transformer Manufacturers, we produce: MSQ Current Transformer,CURRENT TRANSFORMER TYPE LMZ1(2)-0.66,CURRENT TRANSFORMER TYPE LMZ?LMZJ?LMK?LMKJ, JBK3 Machine Tool Control Transformer, RCT,AMC series Current Transformers,and CP-30ACT, CT-30B,CP62 / WS, CP45/14 Current Transformer,JDZ(J)-3?6?10(Q) Voltage transformers,JLSZV-6?10 Three-phase dry outdoor combined transformer,JLS-1 Electric program-controlled gauge,JLS-6?10?35?Model high voltage electric measuring bank, JLSZ?-6?10?35W?Outdoor dry-type combined transformers...

Central to all of the AC power transducers is the measurement of current. This is accomplished using a current transformer (CT), a "donut" shaped device through which is threaded the wire whose current is to be measured. A current transformer is designed to produce either an alternating current or alternating voltage proportional to the current being measured.

It is for measureing alternating current flowing through conductors. Since it is used to measure current, a current transformer is often classified as a type of instrument transformer. One could measure the voltage drop across a known resistor. This is okay for low current applications but is often impractical for high current applications. The resistor consumes a lot of power (lowering efficiency) unless the resistor is very low in value, in which case there may be very little voltage to measure. The resistor could be excessively large. The resistor’s heat may affect the resistor value, thereby reducing the accuracy of the measurement. A current transformer can accurately measure the alternating current and put out a reasonable voltage, which is proportional to the current, but without as much heat and size that an appropriate resistor would require. The current transformer can perform its function with very little insertion loss into the conductor current being measured. The current transformer also provides voltage isolation between the conductor and the measuring circuitry. Proper function of a current transformer requires use of a load resistor. The load resistor is often referred to as a “burden resistor”.

Ningbo Electric & Pneumatic Co.,Ltd (www.ningbo-electric.com), China manufacturer and exporter of industrial electrical equipments and pneumatic series in China, our factories mainly supply: circuit breakesr, contacts,,watt-hour meter, APP Power pole connectors, SB power pole connectors, Industrial Plugs and sockets,push button switchs and pneumatics,pneumatic cylinder,CXSM double,single acting cylinder,double acting,STMB,CX2 skid platform,solenoid valve,pneumatic magnetic valve,hand valve,cylinder manifold..