Description
This plant has big treating capacity for degassing and filtering insulation oil (or silicon oil) used in super high voltage grade 35kV~1000kV oil-immersed instrument transformers, transformers and capacitors.
Features
- The plant is equipped with a crude oil tank with adequate volume for storing crude oil; The tank has functions such as metering, max. & min. level controlling, breathing and sewage discharging, etc.
- Equipped with 2 sets vacuum degassing tanks (6 – 12tons), which is has functions such as heating, temperature keeping, max. & min. level controlling, etc.
- Equipped with clean oil storing tank for storing qualified oil after treated.
- Adopts mutual filtering or single filtering process.
- Combined with filtering function of vacuum oil filter, increases the filtering result.
- Equipped with advanced and reliable vacuum system, heating system and measuring & control system to make sure accurate and reliable control.
- Pipeline layout is reasonable, can be extended to join with vacuum oil-filling system, recycling system and crude oil system outside of factory to become a complete oil system.
- Processing capacity: 6-12m3/h
- Performance value of electric insulating oil after treatment:
Voltage withstanding: ≥65kV (under standard electrode)
tgδ: ≤ 0.04%
Moisture content: ≤5ppm
Air content: ≤0.2％
Filtering fineness: ≤3μm
Gas chromatograph: C2H2=0, H2 ≤5ppm, total hydrocarbon ≤0.4ppm.
Process flow
1. Preparation phase:
Crude oil --- crude oil tank --- vacuum oil filter (or plate-frame oil filter) --- vacuum degassing tank (close the inlet valve when the vacuum degassing tank is full of oil).
2. Filtering phase:
Filtering mode (mutual filtering): vacuum degassing tank 1 --- filter (vacuum oil filter or other filter) --- vacuum degassing tank 2 --- circulated degassing between both vacuum degassing tanks till the sampling is accepted --- degassed oil tank.
3. Oil feeding:
Keep the temperature of degassed oil tank within 60±5℃, the degassed oil can be transported by oil pump to each oil filling ports after received the oil filling signal from control system.
4. Other requirements:
●The level meter in degassed oil tank can really show the quantity of oil in the tank.
● Automatic constant temperature, the heating system will control the temperature of oil in degassed oil tank within 60±5℃ automatically.
● Maximum & minimum level meter in each tank has alarm and protection functions.
● Vacuum system has both auto and manual control modes.
● Auto and manual control modes, necessary protection, alarm and other functions are available in each phase.
● The mutual filtering can be transformed automatically, no need operator to watch over the operation, it is safe and reliable.
● Processing capacity: ≥6000L (adjustable as per requirement).
● Operating vacuum: ≤10-100Pa (adjustable as per the characteristics of product).
● Ultimate vacuum: ≤10Pa
● Pressure of oil filling: 0.15MPa±0.01MPa (adjustable).
● Operating temperature of oil: 60±5℃
● Filter fineness: ≤5µm
● Pumping speed of vacuum unit: 2000m3/h
● Pumping speed of oil pump: ≥6m3/h (adjustable as per requirement).
●Usable capacity of vacuum degassing tank: 6～12 m3 (as per the requirement).
