The effect of current transformer and voltage transformer

1,will be a lot of primary current is transformed into the standard 5 amp;2,for measuring device and relay protection provided acmotor2.blogspot.com by the coil current;3,the primary equipment and secondary equipment in isolation.The voltage transformer is a kind of voltage changer.It will be for low voltage,high voltage transformation in order to use low pressure value reflect changes in the high voltage value.Therefore,by voltage transformer can directly using ordinary electric instrument for voltage measurements.1,also known as the instrument transformer,voltage transformer is a kind of voltage brake rotor changer;2,the voltage transformer capacity is very small,usually only a few tens of to hundreds of volt-ampere;3,a voltage to the power grid voltage,voltage transformer is not affected by the secondary load,and in most cases the load is constant;


4,mainly single phase asynchronous motor secondary side load meter,relay coil,the impedance is very big,rarely by the current.If an indefinite increase secondary load,secondary voltage decreases,causing measurement error;5,to indirectly measure the voltage with voltage transformer,can accurately reflect the value of high side,ensure measurement accuracy;6,no matter how high voltage transformer primary voltage,electric motors price the second level of rated voltage is 100 v commonly,makes measuring instrument and the relay coil voltage to standardize on manufacturing.And ensure the safety of instrument measurement and relay protection work,also solve the insulation of the high pressure measurement,difficulties such as manufacturing process;7,voltage transformer used in distribution instrument measuring and relay protection circuit,etc.