Research on the Experimental Manufacture of Wide-Frequency Standard Current Transformers Devices Based on Compensation Technology

As the new power system is being established to achieve the ambitious goals of "carbon peak" and "carbon neutrality," there is a substantial influx of high-proportion new energy and power electronic devices. This integration is causing unconventional variations in the quality of electrical energy and power load within the grid, particularly in terms of operating frequencies. Meeting the demands of certain specialized users is becoming increasingly difficult. In the realms of electric energy measurement and quality control, a dual challenge arises – the need for accurate low-frequency AC measurements and the capability to pass high-order harmonics. Conventional current transformers are prone to inaccuracies, prompting an urgent exploration of trial production for current transformers utilizing wide-frequency standardization based on passive compensation technology. The study begins with an analysis of the working principles of current transformers, identifying factors influencing their measurement errors. Subsequently, a passive compensation scheme is proposed, featuring a broad effective range for compensation parameters to extend the frequency band of current transformers effectively. In conclusion, the developed wide-frequency standard current transformers, based on passive compensation technology, are subjected to comparative testing against traditional current transformers. The results of the experiments, employing passive compensation methods, successfully broaden the transformers' bandwidth. This enables compensation from the original 0.2-level current transformer to 0.1-level, expanding the frequency band from 5 Hz to 1 kHz.