W□G -

W□G

Type WDG is a drum type de-energized tap changer. It is often designed by the combination of one single-phase and one two-phase tap changers. These two tap changers are to be installed in the clearance between the three winding in one transformer, which is a dramatic saving of transformer space and oil.

Item	Specification			WDG (single phase), WLG (two phases) Type A
1	Max. rated through-current (A)			250		300		400		500	600		800			1000	1250		1600	2000
2	Short-circuit current test (kA)	Thermal (3s)		5	5.4		6			7		8	10		12		14		16	20
		Dynamic (Peak)		12.5	13.5		15			17.5		20	25		30		35		40	50
3	Rated frequency (Hz)			50 or 60
4	Connection			Liner (IV), single bridging (V), Y-D change-over (VI), double-bridging (VII), series-parallel (VIII), reversing (II)
5	Max. Operating Positions			5 (IV), 7 (V, VII), 2 (VI, VIII), 7 (II)
6	Insulation to ground (kV)		Highest voltage for equipment Um	12					40.5					72.5				126
			Rated separate source AC withstand voltage (kV/50Hz,1min)	35					95					140				230
			Rated lightning impulse withstand voltage (kV,1.2/50μs)	75					200					325				550
7	Mechanical life			Not less than 20,000 operations for manual driving Not less than 100,000 operations for motor driving
8	Operation method			Manual operation on top or at side, motor driving at side