VF(R)-12 Embedded High Voltage AC Vacuum Load Switch from China manufacturer

Overview of VF(R)-12

VF(R)-12 is a kind of indoor embedded high voltage AC vacuum load switch-fuse combination device. It is suitable for various power grids and operates safely and stably within its technical parameters. With advanced design, this device is widely used in modern power systems.

Product standard

VF(R)-12 Vacuum load switch conforms to the following standards:

GB 3804-2004: High-voltage load AC switches with rated voltage between 3.6 kV and 40.5 kV.
GB 16926-2009: Standard for high-voltage load AC switch-fuse combinations.

Technical Parameters

Item	Unit	Reference value
Item	Unit	VF-12/T630-20 Vacuum load switch	VFR-12/T125-50 Vacuum load switch-fuse combination	VFH-12/T630-25 High breaking capacity vacuum switch	VFHR-12/T125-50 High breaking capacity vacuum switch-tuse combination
Rated yoltage	kV	12	12	12	12
ightning impulse withstand voltage	kV	75	75	75	75
Rated insulation level 1min power-frequency withstand voltage	kV	42	42	42	42
Rated frecuency	Hz	50/60	50/60	50/60	50/60
Rated current	A	630	125(fuse)	630	125(fuse)
Rated short-circuit breaking current	kA		50(fuse	25(are suppreson chamber)	25im pcesson harx
Rated short-circuic making current (peak value)	kA	50		63
Rated short-time withstand current	kA	20		25
Rated withstand current (peak value)	kA	50		63
Rated breaking current of cable during charge	A	16
Rated breaking current of no-load transformer	kVA	1250		1250
Rated breaking take-over current	A		3150		3150
Breaking times of the rated short-circuit current	Times
Mechanical life		M2 level	M2 leve	M2 leve	M2 level
Weight	kg	125

Operating conditions

Ambient temperature: -40°C to +40°C (less than 35°C within 24 hours)
Relative humidity: ≤95% (daily average), or ≤90% (monthly average)
Altitude: ≤1000 meters

Transformer and fuse selection

Fuses have the ability to cut off high currents in less than 10 milliseconds and have a breaking capacity of up to 50KA, which makes them effective in protecting transformers. When selecting fuses, it is important to consider that the fuse current needs to be 1.6 times its rated value to cope with potential inrush currents. The designer should also allow a margin for the fuse, taking into account the fluctuations in the grid. If the fuse is to be used for high voltage motor protection, consideration should also be given to the frequency of motor start-ups, as frequent start-ups may result in the fuse not being able to cool down in time and thus failing.

Fuse Selection

Primary voltage of the transformer(kV)	Capacity of the transformer(kVA)	Model of the fuse		Rated current of the fuse(A
		Model for the domestic market	Model for international market
6.6	200	XRNT-10	12kV BDGHC	31.5
	250			40
	300/315			50
	400		12kV BDGHC	63
	500			80
	630			90