32
For two or three sets of linkage switch group, all tap changer heads should be connected with horizontal
axis. A tap change, the sound of the diverter switch action can be heard clearly. After the sound of the
diverter switch be heard, it must continue to rotate two and a half turns in the same direction to complete
the first level tap change. In the process of operation, each operation position should be observed at any
time through the observation window on the tap changer head (Figure-7-2), so as to avoid exceeding the
terminal position of the tap changer.
1. Observation window 2. working position
Figure-7-2
7.2 Transformer DC resistance measurement
It should be noted that the tap changer is operated without oil when measuring the DC resistance of
transformer, and the operation of tap changer should be reduced as much as possible.
After the transformer transformation ratio test and DC resistance measurement, the tap changer must be
adjusted back to the calibration position.
1. The tap changer can only be operated through the transmission shaft of the
gear box.
2. In the case of no oil, too much operation will cause damage to the on-load
tap changer!
3. In the case of no oil, the on-load tap changer switching operation shall not
exceed 10 cycles before drying.
To Next Page
Loading...
