Power amplifier used for intelligent substation testing system

The invention discloses a power amplifier used for an intelligent substation testing system. The power amplifier comprises a power supply input module for outputting the 220V alternating-current voltage, a rectifier bridge for rectifying the 220V alternating-current voltage into the 300V direct-current voltage, a DC/DC (direct-current to direct-current) converter for converting the 300V direct-current voltage into the 1-150V direct-current voltage and a DC/AC (direct-current to alternating-current) converter for carrying out power amplification and output on a reference signal, and the four components are connected in sequence. With the adoption of the power amplifier used for the intelligent substation testing system, the efficiency of the power amplifier is improved, and the power intensity of the power amplifier is increased; and in addition, the power amplifier can be further provided with multiple protection design of over-current protection and over-voltage protection, so that the stability and the security of the system in operation are ensured.