CVT

Type CVT is an air-insulated tap changer of selector switch design. Its compact size fits well for distribution transformers up to 11kV system. In various highly populated sites or critical facilities, such as urban high rises, airports, etc., CVT is widely applied for fire-proof and low maintenance purpose.

Item	Specification				CVT
1	Number of phases				3 phases, 1 phase
2	Maximum rated through current (A)				160
3	Rated frequency (Hz)				50 or 60
4	Connection				Y- neutral point D-any connection
5	Max. rated step voltage (V)				500
6	Rated step capacity (kVA)				80
7	Short-circuit current test (kA)		Thermal (3s)		3
			Dynamic (Peak)		7.5
8	Max. Operating Positions				13
9	Insulation (kV)	To ground		Highest voltage for equipment Um	12
		To ground and between phases		Rated separate source AC withstand voltage (kV/50Hz,1min)	35
				Rated lightning impulse withstand voltage (kV,1.2/50μs)	85
		Between adjacent taps		Rated separate source AC withstand voltage (kV/50Hz,1min)	5
				Rated lightning impulse withstand voltage (kV,1.2/50μs)	20
		Across the tap winding		Rated separate source AC withstand voltage (kV/50Hz,1min)	15
				Rated lightning impulse withstand voltage (kV,1.2/50μs)	50
10	Time for one operation				4.4s
11	Mechanical life				Not less than 800,000 operations
12	Electrical life				Not less than 300,000 operations
13	Motor drive unit				SHM-D or CMA7