Resin impregnated paper (RIP), a brand-new class of insulating material with improved thermal and electrical performance, has recently been created.
The main insulation in resin impregnated paper (RIP) transformer bushing type is a core wound from paper that has then been impregnated with epoxy resin. This insulation's casting and curing processes are meticulously controlled.
An insulating envelope (sometimes referred to as a "Silicone Composite insulator") can be attached to a resin-impregnated paper bushing, in which case the empty area can be filled with an insulating liquid or another insulating material like polyurethane foam, gel, etc.
On the basis of the foregoing, it can be said that the main distinction between Oil Impregnated Paper (OIP) bushings and Resin Impregnated Paper (RIP) bushings is that in OIP technology, the condenser cores are impregnated with transformer grade mineral oil, which remains in a liquid phase throughout its entire life, as opposed to RIP bushings, where the impregnation is done via a curable epoxy resin to form a solid con. A solid condenser is created by impregnating the material with a curable epoxy resin, or RIP.
[RIP versus OIP] Comparison of Transformer Bushing Types
We'll now contrast the two types of transformer bushings (Oil-Impregnated vs. Resin Impregnated Paper Bushings) based on a number of different criteria.
Level 1 of Partial Discharge
Resin impregnated paper (RIP) bushings often exhibit lower partial discharge levels than oil impregnated paper (OIP) bushings.
Partial Discharge levels in Resin Impregnated Paper (RIP) are typically less than 2 pC. However, the partial discharge in Oil Impregnated Paper (OIP) is less than 5 pC.
2. Tan Delta Value
For Resin Impregnated Paper (RIP) bushings, Tan Delta values are low.
When it comes to Resin Impregnated Paper (RIP) bushings, the Tan delta value is in the region of 0.35% or lower. However, the tan delta value for Oil Impregnated Paper (OIP) bushings is typically 0.45% or lower.
3. Class of Insulation
According to IEC standard 60137, the insulation rating of an OIP bushing is Class-A, while that of a RIP bushing is Class-E (up to 120 degrees C) (upto 105 degree C).
4. Transportation and Weight
Since composite RIP bushings weigh around 50% less than porcelain OIP bushings, handling, transportation, and installation are made simpler in the case of RIP bushings.
OIP bushings are also more prone to deterioration due to shipping, handling, and installation errors.
5. Mechanical strength and seismic resistance
Standard RIP transformer bushing type having demonstrated very high seismic performance level in accordance with IEEE 693-2005. OIP bushings, however, have a very low capacity to tolerate seismic activity.
In addition, RIP transformer bushing type has very high mechanical strength compared to OIP transformer bushing type's moderate strength.
Installing and Commissioning
The benefits of RIP transformer bushing type installation over OIP bushings are as follows:
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RIP bushings can be inserted at any angle in both the vertical and horizontal directions. OIP bushings, on the other hand, can only be installed at an angle of up to 30 degrees from vertical.
When removing or replacing an OIP bushing, the transformer oil must be lowered; RIP bushings do not require this.
Installing RIP bushings takes far less time than installing OIP bushings.
7. The aspect of upkeep
Resin Infected Due to the lack of oil and porcelain, paper transformer bushings require fewer maintenance inspections than OIP transformer bushings.
8. Explosion Risk & Flammability:
Since no insulating oil was used in the construction of the RIP transformer bushing type, it is non-flammable.
This characteristic also qualifies the bushing as non-explosive.
However, because to insulation failure/arcing, the OIP transformer bushing type has a very high risk of exploding. Due to the fragile nature of the outer porcelain wrap and the potential for a large explosion caused by insulation failure or arcing, these situations can also be risky.