Additionally, the voltage small busbar mounted on the top of the panel also originates from the PT cabinet. These small busbars further distribute voltage signals to other adjacent high-voltage switchgear, enabling voltage signal sharing throughout the entire power distribution. A PT cabinet, also commonly referred to as a bus voltage transformer cabinet, plays a core role in transforming, measuring, and protecting system voltage, providing appropriate voltage signals for secondary equipment. The circuit breaker's fuse provides protection for the voltage. The function of pt cabinet in high-voltage cabinet is to detect bus voltage and realize protection function. It is mainly installed inside PT, disconnector, fuse and arrester of voltage transformer.