High Voltage Cable Accessories

EC Insulator Jiangxi Co., Ltd. is one of the most reliable manufacturers and suppliers of high voltage cable accessories in China. With abundant experience, we are committed to offering high quality custom service. Please feel free to wholesale premium high voltage cable accessories made in China here from our factory.

We make the fittings that join and terminate high-voltage cable runs - at transmission substations, power plants, large industrial sites and grid tie-ins. An HV termination or joint has to carry the rated voltage safely and stay sealed for decades; get it wrong and the whole circuit is at risk, which is why utilities tend to be careful here. Our range covers cable systems from 66 kV up to 220 kV. EC Insulator has been in the power insulator and accessory business for over 15 years, and we mould our own silicone rubber and core rod rather than buying them in.

Most of our HV accessories are built to IEC 60840 and IEC 62067, the standards utilities recognise for high-voltage cable fittings. The stress-control system keeps partial discharge low, and that is what actually decides how long an accessory lasts in service. Outdoor and GIS terminations come with weather-resistant housings, so they hold up in exposed sites. Before we ship we check your cable type, size and voltage class and confirm the right unit; if you want a datasheet, we will send one.

Specific ratings depend on the model and the project cable. If you send the cable type, cross-section and system voltage, we confirm the right unit and provide a datasheet.

Fig. 3 HV Straight Joint

These accessories are for HV cable routes - transmission lines into substations, power plants, and larger industrial or renewable projects. Indoor and outdoor terminations are picked for the site: outdoor units carry weather housings, GIS terminations bolt into gas-insulated switchgear. If the site is polluted, coastal or at altitude, tell us the conditions; we will say whether the standard range fits or you need a special design.

Fig. 5 HV Insulated Joint

The accessory is three layers doing three jobs. The silicone housing keeps water and weather out and provides the insulation. Under it, a stress-control system spreads the electric field where the cable screen is cut back - that is what holds partial discharge down over the life of the part. Metal fittings tie it to the cable and to the switchgear. There is nothing clever about the layout; the value is in getting each layer right, which is why we make the materials ourselves.

We design and test to IEC 60840 for cable systems from 36 kV to 150 kV, and IEC 62067 for 150 kV and above. Every batch goes through factory tests - partial discharge, dielectric withstand, and mechanical and sealing checks - and we ship the test report with the goods. Which standard and test sequence applies depends on the voltage class, so we confirm it against the specific unit you order.

 

 

You can pick termination type (outdoor, GIS or indoor), joint type (straight or insulated), conductor range and housing design. For non-standard dimensions, special terminations or project-specific fittings we run a technical check before quoting - cheaper than sorting out a mismatch after the order.

We ship by ocean freight in reinforced wooden crates, cushioned so nothing gets knocked or scratched in transit. Each batch goes out with a packing list and the factory test report. Lead time depends on quantity, voltage class and model; we confirm it in the PI before you pay.

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