To which bushing is the bridging reactor in a voltage step regulator attached?

The bridging reactor in a voltage step regulator is attached to the load bushing. This is because the primary function of a bridging reactor is to limit inrush currents and to ensure proper voltage regulation on the load side of the system. By connecting the reactor to the load bushing, it helps stabilize the voltage delivered to the load, thereby reducing the risk of voltage fluctuations that can occur when switching occurs in the regulator.

In a voltage step regulator, the load bushing is the point where the controlled voltage is delivered to the end-user or the system that requires regulated voltage. By placing the bridging reactor here, it ensures that the main objective of the regulator—providing a stable voltage to the load—is achieved effectively.

The other bushings serve different purposes: the supply bushing connects to the incoming power source, the control bushing is related to the regulator's control system, and the neutral bushing generally serves a grounding or balancing function. Thus, it is specifically the connection to the load bushing that is crucial for the operation and effectiveness of the bridging reactor in maintaining the quality of the electrical supply to the load.