6
RMO40TD Designated Use, Functionality
4.2 Tap Changer Test
The TapC menu offers a user friendly way of measuring winding resistance in tap changers. The
RMO40TD test set measures
changer, and checks whether the On-Load Tap Changer (OLTC) switches without a discontinuity. In the
moment the tap is changed from tap to tap, the device detects the sudden, very short drop of the current
flow. A properly working tap changer differs from a malfunctioning one in a discontinuity during the
change, by the magnitude of the current ripple value.
and comparing with other phases, allows for an efficient analysis. Disposition of all current ripple
changes (or of the current flow on the graph) depends on a particular transformer and OLTC design, so it
is always recommended to compare results obtained on the same unit with previous measurements.
Note: In TapC menu only Ch:1 is the active channel. Maximum test current selected in the TapC mode is
20 A.
At the start of the test a check of cable continuity is performed. In case of disconnection, an alarm is
activated, and the error message is shown on the display.
Note: Using DV-Win in TapC menu the results could be stored to a PC. By pushing Ω a resistance result
and current ripple value are stored in internal memory location, and the memory location is automatically
increased to the next one.
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