I. YELOCO Series YH-ZYD Double-stage vacuum Transformer Oil Purification machine is special for purification below oils:

• Transformer oil
• Insulating oil
• Cable oil
• Silicone oil
• Dielectric oil
• Mutual Inductor oil
• Switch oil

II. YELOCO series YH-ZYD Double-stage vacuum Transformer oil purification machine can bring benefits to you as below:

1. It keeps the KV of your oil above the required level.
2. Removes explosive gas from the oil.
3. Removes moisture and impurities from oil thoroughly.
4. It increases the life of not only the transformer but also the oil.
5. Have the function of Dehydration for Transformer oil.
6. It can vacuum pumping for the Transformer and vacuum filling oil for the power transformer.

Comparing with the single stage type, YELOCO Series YH-ZYD Double-stage vacuum Transformer Oil Purification machine adopts the double stages vacuum system, which can improve the machine working vacuum value highly, so it can remove the water, gas and impurities in transformer oil high-efficiently, increasing and maintain the oil’s dielectric strength and quality of oil, make sure the electric device running safely. It is mainly used for purifying the insulating oil in all kinds of large power equipment which are above110KV.

III. As the bridge-type vacuum linking system, Series YH-ZYD oil purification machine can be used as independent vacuum source with functions of vacuum drying, vacuum filling oil as below:

• Vacuum filling oil to Transformer and other electrical equipment

Series YH-ZYD Double-stage vacuum Transformer Oil Purifier machine not only have large pumping speed, high vacuum oil purification system, but also have independent vacuum pumping system. This vacuum pumping system and vacuum system of oil purifier machine can free switch. After the independent vacuum pumping system pumped the Transformer and arrived the requirements, then you can switch to oil purifier machine vacuum system and inject the transformer oil to Transformer under the vacuum station.

• Vacuum dry electric transformers

Series YH-ZYD Double-stage vacuum oil purifier machine Vacuum dry electric transformers which use of oil heat transfer effect to achieve. When we dry transformer, first connect the Transformer and oil purifier machine through oil vessel let oil purifier machine and the transformer to form an internal circulatory system and keep vacuum degree at -0.06~ -0.095. Then adopt oil purifier machine heating Transformer oil to 45~50 degree, and let heated oil cycle in the oil purifier and internal circulatory system. At this time, although the transformer oil just have 45 degree, but under vacuum Negative pressure, oil in the water molecules from the liquid water into water vapor, so when 45 degree transformer oil through transformer, Moisture in the transformer core of the water molecules become into the gas to be dry out when vacuum pumping.

• Online operation of the transformer

Series YH-ZYD Double-stage vacuum oil purifier machine Online operation of the transformer which is Online operation of the transformer under the normal power supply cases, without stop a minute electrical. Because Series YH-ZYD have double-infrared fluid level auto-control systems and Germany’s 3UG3 Phase relay which can auto-control oil inlet and outlet. So it can absolute guarantee the oil purifier constant cycle. So will also ensure there have constant oil in transformer in different circumstances. So series YH-ZYD can work with energized transformer. 

IV. In this article, we will mainly introduce  Series YH-ZYD Double-stage vacuum oil purification machine how to vacuum filling oil for Transformer.

Oil Purification Machine Vacuum Filling Oil for Transformer Operation Guide:

1). Preparation work

1. Please implement the coordination work with the personnel in the transformer manufacturer, make the construction date clear and put the relevant process measures, organization measures and safety measures according to the requirements.
2. Please prepare enough qualified new oil, take oil samples for chemical and electric test, analyze and test the test data.
3. Please prepare vacuum oil purification machine and oil drum, oil pipe, pipe joint, valve oil standard pipe and other accessories and ensure that they are clean with no foreign objects.
4. There should be enough lighting equipment and fire-fighting equipment on site.
5. Please get to know the weather condition, confirm the start data and record the temperature, humidity and other data before operation.
6. Please conduct the organizational learning of this scheme, have clear work division and check whether the safety measures on site meet the requirements.
7. Please explain the relevant safety measures and work disciplines clear to the staff members in the shift.

 

2). Vacuum filling oil for transformer

1. Please connect one end of the vacuum pipe on the transformer to the vacuum oil purification machine.
2. Please connect the vacuum oil purification machine, oil storage tank and transformer with pipelines.
3. Please turn on the vacuum pump, improve the vacuum degree evenly in one hour in order to make the vacuum degree reach 1.3Kpa and maintain this vacuum degree for 30 minutes.
4. Please continue vacuum ≤50Pa(We read this figure from the Mai vacuum gauge mounted on the top of the transformer.) when inspecting that the components of the transformer are normal and maintain for 6 hours. Please closely observe the deformation of the transformer box and stop the operation of the vacuum pump and report to the relevant personnel in case of any abnormality.
5. People on duty are prohibited to leave their post in the vacuum process and record the relevant data.
6. Please continue to vacuumize, open the oil outlet valve of the oil storage tank and oil inlet valve of the transformer, turn on the vacuum oil purifier, control the valve appropriately and inject the qualified oil in the oil storage tank from the bottom of the transformer to the transformer at the speed of 4-6 tons per hour. Please closely observe the oil level, stop oil filling, turn off the oil inlet valve on the transformer, disassemble the oil pipe and seal the pipe orifice with the plate when the oil is 100－150mm away from the top of the box.
7. Please continue to vacuumize for 8 hours and maintain the vacuum degree ≤50Pa( red through Mai vacuum gauge).

 

3). Filling Oil for transformer without vacuum

14. Stop the vacuum pump, remove the vacuum degree of the transformer and observe the oil level changes.
15. Please connect the oil purification machine, oil tank and transformer.
16. Please open the oil outlet valve of the oil storage tank and oil inlet valve of the transformer, turn on the vacuum oil purifier machine and inject the oil in the oil storage tank from Buchholz relay to the transformer at the speed of 4-6 tons per hour after the components are inspected to be normal. Please pay attention to the oil level changes on the oil gauge.
17. Slow down the oiling speed when the oil level is nearly to the top and stop oil filling when the oil level is close to the horizontal surface of the lower joint of the Buchholz relay.
18. Please re-install the short joints of the Buchholz relay and turn on the butterfly valve on both sides of the Buchholz relay.
19. Please connect the oil filling pipe at the oil inlet pipe of the oil pillow, open the air-bleed hole on the top of the oil pillow, disassemble the respirator and close the exhaust and oil drain valve in the plenum chamber of the oil pillow.
20. Please re-open the connecting butterfly valve at the cooler and transformer body.
21. Please re-open the oil purifier and inject oil to the high block, oil pillow and cooler. Please immediately stop oiling and close the relevant valve if there is oil overflow from the air-bleed hole at the top of the oil pillow.
22. Please loosen the air-bleed hole screws of the relief valve, high and low pressure side casing lifting foundation, neutral point casing and lifting foundations and tighten these screws in case of any oil overflow.
23. Please turn on the exhaust valve of the plenum chamber of the oil pillow. Loosen the wire holder screw at the high pressure point casing and slightly lift the wire holder and re-tighten the wire holder screw if there is no gas overflow. Please pay attention to the sealing condition on the wire holder.
24. Please close the butterfly valve at the oiling inlet, disassemble the oil pipe and block the pipe joints with plug immediately.
25. Please adjust the oil level of the transformer oil pillow to the appropriate position through the oil drain valve at the bottom of the transformer and tighten the air-bleed hole on the top of the oil pillow. Please pay attention to the tightness of the air-bleed hole.
26. Please slightly tighten the screws on the casing lifting base(tighten appropriately in case of any oil leakage).
27. Please remove the temporary oil gauge and other oiling accessories. Make the transformer static for minimum 24 hours, carefully check the components of the transformer (such as oil level, tightness, deformation, etc.) and have exhaust of the Buchholz relay for appropriate times.
28. Please conduct the chemical and electric test for the oil samples from the transformer.
29. Please clean the site after the oiling of the transformer and everything is normal.
30.  

V. Safety precautions

1. Please set up scaffold around the low pressure side casing from the special channels of the upper and lower transformer and take necessary anti-skidding measures.
2. Please follow the regulations for high altitude operation when working on the top of the transformer.
3. Please get to know the weather condition. The contact time of the equipment and air cannot exceed 12 hours with the air humidity maximum 75％ and the allowable time is 16 hours when the humidity is below 65％.
4. Please pay attention to interrelation in alternate operation and prevent the personnel damage and equipment damage caused by high falling objects.
5. Please make sure that the oil purifier, vacuum pump and electric tools are qualified before using and connect the metal housing to the ground reliably.
6. Please carefully handles the components and make marks in the designated place in order to prevent damage.
7. Please wipe the components with a piece of white cloth or silk fabric rather than cotton yarn.
8. It is strictly forbidden to cut off water when using the vacuum pump. Please maintain the oil temperature 45—55℃ when injecting oil.
9. Slowly inject oil with oiling time minimum 4 hours and maintain the vacuum degree over 6 hours after oiling.
10. The chief responsible person shall coordinate the work among the professionals in the whole work process.

If you have any requirement, please contact us soon. Contact email: sales@yeloco.com, Whatsapp: 0086 13647641182