赖荣光.高压电能表校验装置电流档位控制器设计[J].电测与仪表,2023,60(11):188-193. lairongguang.Design of current gear controller for high-voltage electrical energy meters calibration device[J].Electrical Measurement & Instrumentation,2023,60(11):188-193.
Design of current gear controller for high-voltage electrical energy meters calibration device
The verification device of high-voltage electric energy meter has the ability to output high voltage and large current. In order to verify high-voltage electric energy meters with different current specifications, it is necessary to output current in accordance with the verification regulations. For current, at present, most calibration devices need to manually change the gear wiring of the current riser or current transformer in the state of shutdown and power failure, so as to output the current value that meets the accuracy requirements. This paper presents an automatic controller for intelligent switching of current gear, and introduces its working principle, software and hardware design in detail. Based on the synchronous switching of multiple magnetic holding relays, the controller can control the continuous output of any value within the maximum allowable current without stopping the calibration device, which effectively improves the safety, reliability and rapidity of automatic calibration.