Ways to Make Transformer Economically Practical? Part 2
3.4.2 Acetylene testing device
At 750 degree Celsius high, transformer oil will produce acetylene. The problem of over-high above 1000 degree Celsius and an associated with discharge failure (partial discharge, spark discharge, oil arc fault), acetylene will appear.
Acetylene detection devices include degassing Lan, acetylene sensors, control devices, data processing and output. Its feature is by on-site analysis to analyze the fault style ..
4 Drying moistured transformer on-site
Degree of drying is directly affect insulation and other specifications of transformer. Therefore, drying insulation systems is the firstly factor to extending transformer work.
After drying transformer which be influenced by bump, somethings are required to do firstly:
1) whether exposed time in air is over time;
2) your house damp degree and insulation degree the actual years requirements;
3) how is color change of silicone air dryer;
4) does wind re-winding;
5) whether transformer oil excessive humidity;
6) whether oil leakage;
If an incredibly real one of above problems, the on-site drying is needed.
Drying methods are as follows:
1) hot oil circulation.
It one is more effective to less serious moisture.
It use hot oil as medium, through eddy current, heating transformer then insulation fiber, make moisture evaporation. This method requires vacuum pumping every few plenty. The vacuum degree of tank ought to under l33Pa. Temperture of circulating hot oil should maintain at 60 ~ 70 degree Celsius.
2) Drying by heat oil sprinkle.
It is often a commonly method used for on-site drying, suitable for medium and huge oil-immersed transformers.
This method is to employing a special nozzle, spraying atomization transformer oil which heating above temperature 1O0 degree Celsius, on body of transformer various other it electric heating.
Then pumping vacuum to transpire the moisture on body. The needy machines are simple. Technique has effective for large transformer on-site drying.
3) Field winding charged drying.
It need short secondary winding of transformer, and energize the key winding, to drying insulation systems by electricity heating effect through primary and secondary windings.
This method need use vacuum oil filtration machine to transpire moisture in oil. Comparing the ground insulation resistance from high, midium and low phrase, after drying, the dielectric loss and leakage current of insulation resistance are decrease top reasons.
4) Vacuum drying by load on fuel tank and eddy current formulation.
This technique energized field winding on tank to produce vortex of one's energy. This vortex of energy can increase the internal temperature of tank, so in respect of heating figure.
The turns per coil, current and power-on time are in order to make temperature of tank at 90 ~ 100 degree Celsius.
5) Zero sequence current drying.
It is to choose proper three-phase windings, connected in series possibly in parallel. The windings of other voltage level are open enterprise. Adding zero sequence voltage to choosed winding, to generate zero sequence flux in iron abdominal area. The flux closed circuit through tank produces eddy current loss to drying one's body.
This technique suitable for medium and small distribution transformers blow drying.