Double Stage Vacuum Pumping System | Transformer Vacuum Drying & Evacuation

YUNENG Double-Stage Vacuum Pumping System is designed for efficient transformer vacuum drying, evacuation, and vacuum oil filling during transformer manufacturing, installation, and maintenance.
Featuring a two-stage vacuum pumping configuration, the system delivers fast air and moisture removal with stable vacuum performance, achieving an ultimate vacuum of ≤3 Pa and pumping capacities from 70 to 1200 L/s.
Multiple ZJ Series models are available to match different transformer sizes and vacuum treatment requirements.

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Product Description:

Parameters of Double Stage Vacuum Pumping for Power Transformer

Parameter		Unit	ZJ-70	ZJ-150	ZJ-300	ZJ-600	ZJ-1200
Power Supply			50Hz 380V 3-Phase 4-Wire (or as requested)
Power Supply		KW	4	6.5	7	11	18.5
Limit Vacuity		Pa	≤3
Pumping Speed		L/S	70	150	300	600	1200
Pumping Level			2
Connection Diameter		mm	50			80
Size	Length	mm	1200	1300	1400	1600	1750
	Width	mm	950	100	1100	1200	1300
	Height	mm	1500	1600	1700	1900	2100
Weight		Kg	300	400	500	1250	1560

The machine size and weight will change slightly due to different configurations

What is Double Stage Vacuum Pumping System?

In most cases, a 2-stage pump will go down below 1 micron .001mm mercury vacuum. A single-stage pump is generally specified out at less than 15 microns .015mm mercury vacuum. 2 stage pumps are more expensive than a 1 stage pump because they have a high vacuum stage, what we refer to as an exhausting stage.

Advantages of Double Stage Vacuum Pumping System

Double Stage Vacuum Pump System for power transformer oil filtration machine has a GIS connection.
It features digital vacuum degree management, anti-absorption, fast start, strong vacuum pumping capacity, stable performance, and easy operation.
There is a combination of axial fan and condenser to deal with moisture and gas from the vacuum pump and roots pump. It can prolong the time to change vacuum oil while meeting emission standards.