Image:Tap changing.gif

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Animation of an on-load transformer tap changer, illustrating how taps can be selected without either interrupting supply or short-circuiting winding turns.

The tap changer starts at tap position 2, with load supplied directly via the right hand connection. Diverter resistor A is short-circuited, diverter B is unused.

If the tap changer is moved to tap 3, the following sequence occurs:

Switch 3 closes, an off-load operation.
Rotary switch turns, breaking one connection and passing load current through diverter resistor A.
Rotary switch continues to turn, connecting between contacts A and B. Load now supplied via diverter resistors A and B, winding turns bridged via A and B.
Rotary switch continues to turn, breaking contact with diverter A. Load now supplied via diverter B alone, winding turns no longer bridged.
Rotary switch continues to turn, shorting diverter B. Load now supplied directly via left hand connection. Diverter A is unused.
Switch 2 opens, an off-load operation.

The animation then shows the tap changer returning to its starting position by reversing the above sequence of operations.

[edit] References

Central Electricity Generating Board (1982). Modern Power Station Practice. Pergamon. ISBN 0-08-016436-6.

I, the creator of this work, hereby grant the permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. Subject to disclaimers.

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	22:51, 4 February 2006	250×500 (188 KB)	BillC (Talk \| contribs)	(Add frames to make animation smoother)
	22:36, 22 January 2006	250×500 (144 KB)	BillC (Talk \| contribs)	(Pause longer at switch open/close frames)
	22:15, 22 January 2006	250×500 (144 KB)	BillC (Talk \| contribs)	(50% slower version)
	20:27, 22 January 2006	250×500 (144 KB)	BillC (Talk \| contribs)	(Animation of an on-load transformer tap changer)