Design Of A Power Amplifier For Distributed Test Systems For Electromagnetic Transformers

At present,electromagnetic transformers combined with merging units are applied to the connection of primary and secondary systems in intelligent substations,which makes the organization and distribution of secondary system information more complex and makes Relay protection devices,measurement and control devices transmit information flow.complicated,thus increasing the difficulty of testing the secondary system functions.The group proposes a distributed test system for electromagnetic-type transformers to address this issue,with the power amplifier functioning as its direct output,in order to assess the secondary system’s overall performance.,and its role is to simulate the actual output voltage and current of the electromagnetic transformer,which is the core component of the distributed test system,and it can not only propose effective support for the overall test of the secondary system,but also provide a strong guarantee for the operation of the intelligent substation,which is of great significance to realize the safe operation of the power system network.Based on the overall performance test demand of the secondary system for the distributed test system of electromagnetic transformer,in order to simulate the actual output voltage and current of the electromagnetic transformer,this thesis designs a new±100V voltage amplifier composed of a Darlington-like division half-bridge drive structure and voltage series feedback structure,and a ±30A current amplifier composed of a Darlington shot-stage push-pull structure and voltage-to-current conversion circuit.They have high efficiency output,excellent frequency domain characteristics and fast response.In order to meet the accuracy requirements of the power amplifier for the distributed test system of electromagnetic transformers,linear regulated power supplies with outputs of ±150V,±15V and ±20V are designed in this thesis,all of which have the advantages of good stability,fast transient response,reliability,high accuracy and low noise to ensure the normal operation of the system.The developed linear voltage regulator power supply and amplifier are also applied to the analog transformer sub-terminal,and their performance is measured;and combined with the distributed test system for electromagnetic transformers,field tests are conducted in a 110 KV intelligent substation of the Southern Power Grid,and the test contents fully verify the actual performance of the linear voltage regulator power supply and power amplifier designed in this thesis in the analog transformer sub-terminal,and provide a strong basis for their application in the actual engineering.The test content fully verified the actual performance of the linear voltage regulator and power amplifier designed in this thesis in the analog transformer sub-terminal,and provided strong support for its application in actual engineering.