Off Load Tap-Changer The main characteristics of this new series of tap changers are: Speed of installation; Safe and exact switch movement; Exact contact positioning after the switching maneuver; Compact dimensions; Possibility to adapt to the thickness of the transformer tank.
These units may be used with mineral oil or silicon liquid. They are fixed below the transformer cover by a support. They allow adjustment or combinations according to the diagrams given in the following pages. There is no need for washers during assembly because the tap changer adjusts itself according to the thickness of the transformer tank. Oil tightness is provided by O-rings. The catalogue illustrates normally used tap changers and standard accessories. Special tap changers may be designed to meet special requirements. Tap changing procedures are very quick and simple. They must be performed with de-energized transformer in a no-load state. To switch, just lift the knob, rotating it until the desired number or mark coincides with the colored arrow on the washer. Release then the knob and make sure that it is fasten.
WST □ - □/□-□╳□ W: off-circuit S : three-phase or D for single phase T : linear type tap chager □: voltage regulation model □: rated current □: rated voltage □: number of tapping heads □: number of tapping position Voltage Regulation Model I : terminal point II : central point III : neutral point IV : Y-△ conversion V : series-parallel connection
Samples Technical Data
Central point(Ⅱ) Neutral Point(Ⅲ) Terminal Point(Ⅰ)