Current Transformers for 420kV Voltage Class
The 420kV current transformer (CT) is core equipment in 420kV high-voltage power systems. Based on the principle of electromagnetic induction, it proportionally transforms large primary currents into standard small secondary currents (1A/5A). By achieving current transformation and electrical isolation, it provides reliable signals for measurement, metering, and relay protection. It is widely applied in outdoor AIS/GIS substations, large-scale industrial and mining facilities, and renewable energy bases.
Application Scenarios
•420kV High-Voltage Substations: Used for current monitoring and fault clearing in circuits such as transmission lines, main transformers, and busbars, ensuring the safe and stable operation of the power grid.
•GIS/GIL Smart Substations: Inverted SF₆ CTs integrated with GIS enable compact equipment design and smart capabilities, adapting to the dispatching requirements of smart grids.
•Large-Scale Industrial/Renewable Energy Bases: Provides highly accurate current signals for high-power generating units and photovoltaic (PV) / wind power collector lines, meeting the measurement and protection requirements of heavy loads.
