Half-wave detecting method and half-wave detecting system

The invention provides a half-wave detecting method and a half-wave detecting system, wherein the method and the system relate to the field of laminated power supply half-wave detecting technology. The half-wave detecting method comprises the steps of determining a tap branch circuit at the output end of a transformer through a triggering pulse; respectively controlling a silicon controlled rectifier through the triggering pulse for obtaining laminated voltages which are output from two adjacent tap branch circuits, respectively acquiring positive half-wave voltage values and negative half-wave voltage values of the voltages which are fed back from the adjacent tap branch circuits; comparing the positive half-wave voltage values and the negative half-wave voltage values of the voltages which are fed back from the adjacent tap branch circuits for obtaining a difference; determining whether a fault occurs in the bidirectional silicon controlled rectifier in the tap branch circuit which corresponds with the diff