CM2

Type CM2 on-load tap changer perfectly integrates the proven reliability of type CM and vacuum switching technology. Completely same dimension not only saves the transformer designers from re-designing the transformer for vacuum technology, but also provides a direct retrofit diverter switch for existing tap changer upgrade from conventional to vacuum tap changer.

Item	Specification			CM2III 500Y CM2 I 500	CM2III 600Y CM2 I 600		CM2 I 800		CM2 I 1200		CM2 I 1500
1	Max. rated through-current (A)			500	600		800		1200		1500
2	Rated frequency (Hz)			50 or 60
3	Connection			3 phases for neutral point of star connection 1 phase for any selectable winding connection
4	Max. rated step voltage (V)			3300
5	Rated step capacity (kVA)			1400	1500		2000		3100		3500
6	Short-circuit current test (kA)		Thermal (3s)	8	8		16		24		24
			Dynamic (Peak)	20	20		40		60		60
7	Max. Operating Positions	Without change-over selector		18
		With change-over selector		35
8	Insulation to ground (kV)	Highest voltage for equipment Um		72.5		126		170		252
		Rated separate source AC withstand voltage (kV/50Hz,1min)		140		230		325		460
		Rated lightning impulse withstand voltage (kV,1.2/50μs)		350		550		750		1050
9	Internal Insulation Level			4 grades of B, C, D and DE according to insulation level
10	Mechanical life			Not less than 1,500,000 operations
11	Contact life			Not less than 600,000 operations
12	Oil compartment of diverter switch		Service pressure	0.03Mpa
			Leakage test	No leakage under 0.08Mpa for 24 hours
			Over pressure protection	Bursting cap busts at 300 ± 20%kPa
			Protection relay	Oil flow speed set at 1.0m/s ±10%
13	Motor drive unit			SHM-D or CMA7
14	Oil filter plant			ZXJY-1 / ZXJY-2 / ZXJY-3 according to requirement (Necessary when max. rated through current is 1000A and above or OLTC used for industrial applications)