In the high-voltage distribution and measurement process of the power system, the current transformer (CT/potential transformer, PT) is a key component for achieving current and voltage sampling and isolation. In order to ensure its long-term electrical safety and reliable transmission performance, the internal coils and components of the transformer need to be protected by high insulation and thermal conductivity potting.
However, traditional epoxy systems are difficult to meet the comprehensive requirements of insulation and long-term stability for high-voltage transformers due to high viscosity, high internal stress, and difficulty in defoaming.
Insulation, thermal conductivity, and sealing of high-voltage transformers
Analysis of application difficulties
In the sealing application of high-voltage transformers, engineers usually face the following technical challenges:
one ️⃣ Lack of fluidity: During sealing, the colloid is difficult to penetrate the gap between the coils, which can easily lead to bubbles and voids.
two ️⃣ High insulation requirements: Long term exposure to high voltage electric fields requires excellent dielectric strength and electrical insulation properties.
three ️⃣ Low stress and corrosion resistance: If the shrinkage rate is high during the curing process, it will lead to stress concentration and affect the stability of the coil structure.
four ️⃣ Operability: On site sealing requires room temperature curing and strong self foaming ability, making it easy for large-scale production.
Recommended solution – SIPC 1818 low viscosity silicone rubber sealant
Considering the complex structure, deep sealing space, and high heat dissipation requirements of high-voltage transformers, it is recommended to use Elaplus SIPC 1818A/B two-component silicone sealing adhesive.
This product has become an ideal solution for the high-voltage transformer industry due to its excellent low viscosity, self foaming, and electrical insulation properties.
Product Features
Advantages of Performance Metrics Explanation
Low viscosity (1200~1500 CPS) with excellent fluidity, can quickly penetrate the interior of the coil and effectively remove bubbles
Excellent self foaming performance, achieving a dense and smooth cured surface without the need for vacuum sealing
Room temperature curing, adjustable reaction time, flexible operation, adaptable to different production line rhythms
Excellent insulation effectively prevents high-voltage breakdown and improves device reliability
Low hardening shrinkage rate, no deformation or cracking after stress free curing, and no corrosion to copper wire, iron core, and plastic
Good adhesion performance can firmly adhere to various substrates such as epoxy resin skeleton, plastic shell, and metal base
Typical application scenarios
Sealing and Insulation Protection of High Voltage Transformer Coil
Sealing of power transformers and coil ends
Power control module, driver module protection
Fixed structure of EMC magnetic core and coil
Moisture protection of photovoltaic and energy storage electrical interface module
Application scenarios of sealing adhesive
Application scenarios of sealing adhesive
Application advantages
The use of SIPC 1818 can significantly improve the safety and stability of transformer products:
✅ No bubbles inside, eliminating the risk of partial discharge
✅ Smooth sealing and excellent consistency in appearance
✅ Room temperature curing, easy to operate, reducing process costs
✅ Excellent long-term temperature resistance, suitable for outdoor and humid environments
In the sealing scenario of high-voltage transformers, Elaplus SIPC 1818 effectively solves the problems of traditional epoxy systems being prone to bubbles, cracking, and poor processability due to its low viscosity, high insulation, and self draining properties.
This product not only significantly improves insulation safety and thermal stability, but also reduces production complexity and maintenance costs, making it the preferred solution for reliable packaging of high-voltage electrical components.
Tags: Elaplus SIPC 1818 · Transformer Sealing Adhesive · Low viscosity Sealing Adhesive · Bubble free Sealing Adhesive · Organic Silicon Sealing Adhesive · Electronic Sealing Adhesive · Insulation Sealing Adhesive · High voltage Transformer Sealing Adhesive
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