Split core and solid core current transformers each offer clear advantages for metering applications, but they solve different project needs. Split core CTs stand out for retrofit flexibility, non-shutdown installation, and field convenience. Solid core CTs stand out for structural continuity, planned integration, and stable use in fixed meter assemblies. The right decision should be based on installation conditions, system design, mechanical requirements, and long-term reliability goals. By selecting the CT structure according to the real application instead of structure alone, metering projects can achieve better efficiency, stronger performance stability, and lower implementation risk.