The Trojan HVPS Series are designed for use on non-energised transformers, employing a well proven process that combines varying levels of vacuum & oil heating for the following applications: 

Removal of moisture, gases & particulate from oil

Filling or emptying power transformers

Processing oil in bulk storage tanks

Transferring oil from one location to another

During processing, the oil is drawn from the supply reservoir by the inlet pump on the Trojan HVPS through an inlet strainer. The oil then passes through a heater bank where it is heated to the required temperature.

As the oil enters the vacuum chamber, it passes through porous fibreglass coalescer cartridge elements, exposing the oil to a large surface area to maximise the release of gas and moisture. The elements are constructed from bonded fibreglass where millions of sharp edges shear the oil (effectively increasing heat and surface tension). This method is significantly more effective than using spray nozzles and will require fewer passes to degasify the oil to the same level. Oil as low as 25°C can be treated successfully by this method.
Vacuum is maintained in the chamber by a large capacity vacuum pump. The processed oil collects in a chamber beneath the vacuum tank where a high suction centrifugal pump transfers the oil through the final polishing particulate filters before returning to the transformer or oil reservoir.

The entire streamliner system is PLC controlled and is designed to run continuously and be self compensating. After the initial setup, it can be left unattended during processing. The PLC monitors controls a series of solenoid valves, level switches, and temperature sensors. For example, the oil level in the vacuum chamber is maintained automatically. Foaming is controlled by a foam level detector, which is activated if the foam rises above a preset level. If the sensor is activated, air is allowed to enter the vacuum chamber, knocking back the foam and protecting the vacuum pump.

Throughout processing the key values are displayed on the screen in real time.

Performance

Performance in a single pass of the oil at full flow rate:

Water removal – from 50ppm to < 5ppm, and down to < 3ppm after a second pass

Gas removal – from fully saturated with air (10% to 12% by volume) to <0.1% by volume

Particles – 98% of particles over 1 micron, or as required. Cartridge filters are used for ease of replacement, no loss of oil when changing and low cost of replacement

Dielectric strength – Improvement of new oil to exceed 70Kv / 35kv

Oil Heating – is by low watt density (max. 1.7 watts per sq cm) to prevent heat degradation of the oil. Elements are sheathed in tubes to provide uniform heating of oil, protecting the oil from hot-spot burning. Heavy duty contractors are used in conjunction with reliable thermostatic control. Heating load is progressive. Loss of oil flow pressure will immediately shut off the heating.