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An engineer has about four hours to terminate a 220kV cable run before substation goes live, and they're working with a 2500mm² XLPE conductor that absolutely cannot tolerate partial discharge above background levels.
What we've got here is the YJJJI Series—monolithic prefabricated silicone rubber straight joints, GIS terminals, and flexible terminals for 66kV through 220kV systems, all tested to IEC 60840 standerd with power frequency withstand ranging form 90kV all the way to 318kV for a full 30 minutes.
Lightning impulse withstand sits at 450kV to 1050kV depending on your voltge class, and the sealing test is 0.25±0.01MPa for an hour—it actually passed first time on our last batch, which isn't always the case.
The insulation is grey silicone rubber molded as one piece, so the stress cone and shielding are already integrated—no assembly guesswork in the field, basically plug and play for the installation crew.
They're not ideal for overhead line terminations or anything below 66kV (you'd want a different series for distribution stuff), but for substation environments and coastal industrial sites the monolithic construction holds up well to moisture and salt spray.
We ship them in wooden cases (usually 50 units or so per crate), and while we typically have stock for the 110kV straight joints, the 220kV flexible terminals might need a 20-day lead time or so depending on silicone curing schedules.
The partial discharge level is kept at or below background level, which means it's virtually undetectable during testing. This ensures reliable performance under high-voltage conditions.
Yes, we can supply test reports and certificates showing compliance with IEC 60502, IEC 60840, and GB/T 11017. Just let us know which standards you need documented.
Our MOQ for 220kV GIS terminals is typically 5 units per order. If you need fewer, we can discuss it depending on stock.
Yes, silicone rubber is naturally resistant to moisture, salt spray, and chemical exposure, so it's well-suited for coastal and industrial substations. The monolithic prefabricated design also adds durability.
They come in sturdy wooden cases designed to protect against impact and moisture during transit. Each case is labeled with product details and handling instructions.
