SHGV -

SHGV

Type SHGV vacuum on-load tap changer is of combined structure, applicable to SF6 gas insulation regulating transformers, comprising two major parts: diverter switch and tap selector. Tap changer is laid in the transformer gas tank by means of its head flange and the diverter switch is in a separate gas compartment. It can be used at neutral point of star-connection for three-phase; singe-phase for any selectable winding connection; a combination of three units of single-phase for any selectable winding connection and any position voltage regulating.

Item	Specification		SHGV
1	Max. rated through-current (A)		400	600		800
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)		4000
5	Rated step capacity (kVA)		1200	1500		1600
6	Short-circuit current test (kA)	Thermal (3s)	6	8		9.6
		Dynamic (Peak)	15	20		24
7	Max. Operating Positions		27
8	Insulation to ground (kV)	Highest voltage for equipment Um	72.5		126
		Rated separate source AC withstand voltage (kV/50Hz,1min)	140		230
		Rated lightning impulse withstand voltage (kV,1.2/50μs)	350		550
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 300,000 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)