变压器联结组别与直流电阻测量原理的分析

Analysis of Transformer Connection Group and DC Resistance Measurement Principle

变压器是一种特殊的电机,它利用电磁感应原理实现交流电能的变换,只变换而不能产生电能,一二次侧维持能量守恒。直流电阻测量时,在绕组的被试端子间通以直流,非被试绕组开路,由于被测绕组中有电感,测量回路中电流逐渐达到稳定。变压器中铁心的磁导率很高,而电力变压器绕组的电感很大为数百亨至数千亨,而直流电阻很小最小至数百微欧,导致直流电路中电流稳定的时间比较长。

Transformer is a kind of special motor,which uses the principle of electromagnetic induction to realize the conversion of alternating current energy.It can only transform but not produce electric energy,and the primary and secondary sides maintain energy conservation.When measuring the DC resistance,DC is applied between the tested terminals of the winding,and the non tested winding is open circuit.Due to the inductance in the measured winding,the current in the measurement loop gradually reaches a stable value.The permeability of the iron core in the transformer is very high,while the inductance of the power transformer winding is very large,ranging from hundreds to thousands of henges,while the DC resistance is very small and the minimum is hundreds of micro ohm,which leads to the long time of current stability in the DC circuit.