In modern medium-voltage power distribution systems, accurate energy measurement is essential for electricity billing, energy management, and regulatory compliance. One of the most important components responsible for this function is the Metering Cabinet, often referred to as a Metering Switchgear Panel.

In modern medium-voltage distribution networks, equipment such as cable branch boxes, pole-mounted transformers, ring main units (RMUs), and switching stations often appear similar in both structure and application.

In electrical distribution systems, industrial power supply, and building low-voltage installations, two types of current transformers are commonly encountered: the Zero-sequence Current Transformer (ZCT) and the Residual Current Transformer (RCT).

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In any medium-voltage (MV) distribution system, the Incoming Switchgear Cabinet (often referred to as the KYN28 series or Central-Mounted Cabinet in international markets) serves as the "Primary Entry Point." It is the critical interface where high-voltage power from the utility grid or a main transformer enters the facility's distribution network.