Epoxy Bushings vs. Porcelain Bushings
Why Epoxy Bushings Beat Porcelain?
When it comes to bushings for hydro use in transformers and breakers, more and more engineers and transformer manufacturers are specifying epoxy over porcelain. They find these bushings stronger, lighter, more durable and more flexible. And because epoxy bushings don’t require special assembly, they are far less likely to malfunction and leak, causing destructive flashovers draining the transformer, which leads to delays, penalty clauses that are very costly.
No Assembly Required
With porcelain electrical transformer bushings, purchasing managers have to order parts from five vendors or more to create a whole one. This requires transformer manufacturers to incur inventory costs and labour costs to assemble the bushings.
Typically, it takes about 16 parts and at least one to two hours of labour to assemble a porcelain bushing, which also needs to be glued and left overnight to dry.
Besides the additional costs, the assembly process may mean the porcelain bushings are more prone to defects, which can cause them to fail in their jobs of insulating the conductors that carry the high-voltage current through grounded enclosures. And if the bushing cracks or fails, the transformer manufacturer is left responsible to replace it, incurring more time and labour costs.
By contrast, an epoxy bushing requires no assembly and can be cast in nearly any required geometry and design. Not only does this save assembly time and storage costs, it makes for a safer, more reliable and flexible product.
More Strength, Better Performance
At Anmei electric, our Epoxy Transformer Bushings are manufactured to the the highest quality standards and are available for indoor low-to-high-voltage use. Anmei has over 15 years of experience .
Our epoxy bushings are non-tracking, self-scoring and non-weathering, so they offer outstanding performance in all types of environments, even highly contaminated areas. Far lighter (60% lighter) and sturdier (10 times the tensile strength) than porcelain, epoxy bushings will not crack due to thermal shock.
Epoxy resin insulators also resist high-power arcs and have a greater dry arcing distance than porcelain insulators, because they have free ends instead of metal caps.
Epoxy bushings also have:
- A low partial discharge
- A thermal coefficient of expansion 1/20th that of porcelain
- Compression strength four to six times greater than glazed porcelain
- Flexural strength of cycloaliphatic that is up to 15 times greater.
To find out how Anmei electric can provide in-stock or custom manufactured Epoxy Bushings to suit your needs, call (0068-18730709939) or email one of our sales reps.