What Are The Advantages Of Epoxy Resin Lining? It's A Good Partner For High Voltage Insulation.

1, Introduction: The indispensable insulation component in high voltage equipment.
In high voltage electrical equipment, such as switchgear, transformer and ring host, the reliability of insulation directly determines whether the whole equipment can operate safely for a long time. As a core part of solid insulation, The epoxy resin liner is responsible for isolating charged conductors from grounded housing, and for multitasking such as voltage resistance, flashover prevention and support conductor. Compared with traditional ceramic and rubber insulation elements, epoxy resin bushings has become an increasingly popular insulation partner in medium and high voltage distribution equipment.
2, Excellent electrical performance, high voltage resistance and partial discharge control ability.
Insulation is the core advantage of epoxy resin lining. The cured epoxy resin has high dielectric strength, can withstand continuous high voltage impacts, and is not prone to failure and leakage. The inner structure of the casing cast by APG pressure gel process is compact and uniform, and the defects of partial discharge induced by bubble and cavity are effectively reduced.
The stable low partial discharge means that the insulation layer will not be slowly corroded by continuous discharge during long period of charged operation, greatly reducing the aging speed of insulating material. At the same time, engineers can extend the creepage distance, suppress surface flashover, meet strict insulation standards in limited cabinet space, and adapt distribution to mainstream voltage levels such as 10kV and 35kV through the design of umbrella skirt.
3, Better mechanical toughness, impact resistance and earthquake resistance, and is not easy to breakage.
Traditional ceramic insulation bushings has a fragile texture and is prone to cracking and breakage during impact, vibration and short circuit shock. They pose a high risk for transport, installation and use in earthquake-prone areas. Epoxy resin lining is a kind of polymer curing material which balances hardness and toughness. It can withstand the impact when the equipment is closed and short-circuit, and is not susceptible to brittle fracture.
It is lightweight and can not only reduce the load bearing pressure of the internal support structure of the switchgear, but also facilitate the installation and handling of the construction personnel on site, and reduce the probability of collision and damage during assembly. The advantages of mechanical stability are more obvious in continuous vibration working conditions, such as mines, rail transit and factory distribution rooms.
4, Resistant environmental aging and adapt to complex, humid and polluted working conditions
Electrical equipment usually operates in humid, dusty, greasy or even salty conditions. Insulation degradation can occur when insulation components become damp or contaminated. Epoxy resin material itself is compact, non-absorbent and has excellent moisture resistance, oil pollution prevention and alkali corrosion resistance. It is difficult for water vapor to penetrate into the material, which destroys its insulation performance.
The quality formula epoxy lining also has good anti-aging properties. Under long-term temperature rise environment, the performance decreases slowly, and it is not easy to soften, deform, crack and powder. Whether indoor switchgear, outdoor mesh boxes or internal transformer boxes, it can work stably to reduce insulation failures caused by moisture and dust pollution.
High degree of freedom of molding, suitable for the trend of miniaturization of equipment.
Epoxy resin can be cast and molded in one go, and can be integrated into complex shapes such as flange, shielding structure, umbrella skirts and installation slots according to the requirements of equipment structure. It can also be tightly integrated with metal inserts for insulation and support integration. Traditional ceramic parts are difficult to form, shape modification is costly and complex integration structures are difficult to achieve.
At present, the development of high voltage distribution equipment is developing in the direction of miniaturization and miniaturization, which leads to the continuous compression of the installation space of insulation components. The high insulation density of epoxy resin liners can achieve the same voltage resistance level in smaller volume, which can help reduce the size of switchgear and save space of distribution room. This is also an important reason why epoxy insulation components have been widely used in epoxy mainframe and inflatable cabinet in recent years.
6. Simple operation and maintenance, low overall cost, long term use.
resin bushings is a maintenance-free solid insulation components that does not require regular oil quality testing, oil replenishment, or frequent cleaning and maintenance during normal use, such as oil immersed bushings. As long as the plant is pressure-resistant and partially discharged, it can operate steadily under rated conditions for many years, greatly reducing the later inspection and maintenance workload.
While individual items may not be the cheapest to buy, overall failure rates are low, there is less damage and replacement and less downtime risk. Comprehensive use costs are more advantageous across the life cycle. Of course, it has its limitations. After solidification, it cannot be melted and repaired. Once the internal insulation is damaged, it can only be replaced as a whole. At the same time, the requirement of casting process is high, and inferior products are easy to produce the danger of internal bubbles.
Conclusion:
In general, the core value of epoxy resin lining is to combine excellent electrical insulation, reliable mechanical strength, good environmental protection and flexible molding ability. traditional ceramic bushings is fragile, bulky and limited in appearance. It is suitable for the development of modern high voltage distribution equipment. It is the combination of these multiple advantages that makes it a reliable insulation partner for HV equipment, silently guarding the safety of the power grid distribution chain.