Taking the IEC and Chinese national standards on synthetic test of high-voltage circuit breaker as the guidance

a closing switch of current source based on triggered vacuum switch（TVS） and a synthetic making test circuit at full rated voltage were presented.The key difficulty to perform a synthetic making test at full rated voltage and the main factors impacting the equivalent condition and performance of synthetic test with direct test were analyzed.The criterion on whether the launching device of current source is to work was also discussed.A prototype of the proposed launching device of current source at rated parameter 110 kV/63 kA and the measurement and control system for synthetic making test were designed and implemented.The functional and reliability tests of the system at the applied peak voltage were carried out in Xi’an High Voltage Apparatus Research Institute.The results indicate that the measurement and control system performs accurately and reliably in high power laboratory condition.