The 33KV On-load tap changer (OLTC) is a device that allows for on-load tapping of a 33KV three-phase electrical feeder. It is used in the service and distribution industry to protect the equipment and components connected to the line. It has three separate taps, one for each phase of voltage.It can be used as an active tap changer or as a passive tap changer. In the active mode, it uses capacitors and resistors to provide voltage isolation between phases, which can be adjusted depending on the application. In the passive mode, no internal capacitors are used, so this device provides only isolation between phases without any control over the current flow through them.
