CMD -

CMD

Type CMD is designed with state-of-the-art technology and concept. Its unique contact system ensures superior performance for carrying heavy load and enduring short circuit current. In large power and ultra high voltage transformers, Type CMD is the natural choice to achieve high reliability.

Item	Specification		CMDIII				CMDI
1	Max. rated through-current (A)		400	600		1000	400			600	1000					1600		2400
2	Rated frequency (Hz)		50 or 60
3	Connection		3-phases Y connection for neutral point only				Single-phase for any selectable winding connection
4	Max. rated step voltage (V)		3300			4000	3300					4000
5	Rated step capacity (kVA)		1500	1600		3000	1500			1600		3000				4400	5600
6	Short-circuit current test (kA)	Thermal (3s)	6	8		12	6			8		12				24	24
		Dynamic (Peak)	15	20		30	15			20		30				60	60
7	Max. Operating Positions		14 without change-over selector; 27 with change-over selector
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	Tap selector		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 200,000 operations
12	Oil compartm-ent 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)