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integral prefabricated intermediate joint

integral prefabricated intermediate joint

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Application areas:

Primarily used in high-voltage AC power transmission, for connections between high-voltage power cables.

Product Description

  • The joint has a compact structure, is easy to install, has a long creepage distance in the rubber insulation, and has a large design flexibility, making it suitable for long-term stable operation in particularly humid areas.
  • The outer sheath adopts a high-strength protective shell and a waterproof and insulating sealing structure, which has good mechanical and sealing performance, as well as good corrosion resistance, ensuring the safe operation of the joint in harsh environments for a long time.
  • It has good explosion-proof performance and will not form fragments that could endanger personal or equipment safety in the event of an accident;
  • The outermost layer can be fitted with a fiberglass outer protective box, and the inside is filled with high-voltage cable waterproof sealant to enhance its waterproof performance.

Product Parameters

name Integral prefabricated intermediate joint
Model Specifications WYJJTI、WYJJJI WYJJTI、WYJJJI
Implementation Standards IEC60840, GB/T11017 IEC62067, GB/Z18890
Rated voltage (U0/U) 64/110kV 127/220kV
Maximum operating voltage (Um) 126kV 252kV
Baseline Impact Resistance Level (BIL) 550kV 1050kV
Maximum rated temperature of conductor
a): During normal operation 90℃ 90℃
b): Transient (short circuit time not exceeding 5 seconds) 250℃ 250℃
Insulating materials Imported EPDM rubber Imported EPDM rubber
Stress cone material Imported EPDM rubber Imported EPDM rubber
The connector is suitable for cables with the following outer diameter (after grinding). Φ56-85mm Φ80-116mm
Storage conditions and shelf life Store in a cool, dry, sealed container away from light. 5 years. Store in a cool, dry, sealed container away from light. 5 years.
Relative permittivity of insulation 2.3-3.2 2.3-3.2
Volume resistivity of insulation ≥1×10¹⁵Ω·cm ≥1×10¹⁵Ω·cm
Connecting pipe
a): Crimping process description Hexagonal compression Hexagonal compression
b): Dimensions of the crimping die Selected according to cable conductor cross-section Selected according to cable conductor cross-section
weight 120kg 160kg
Sealing method of the joint Waterproof tape, heat shrink tubing, cable sealant Waterproof tape, heat shrink tubing, cable sealant
Electrical connection method for grounding with metal sheath Welding or sealing lead Welding or sealing lead
Enhanced protective case (optional)
a): Materials Fiberglass Fiberglass
b): External dimensions 2100×500×400 2850×600×600
Waterproof materials
a): Materials polyurethane polyurethane
b): Quantity 125kg 175kg
Insulating joint metal sheath
a) Withstands DC voltage 20kV 25kV
b) Withstands impulse voltage 75kV 95kV

Product Selection

Straight-through intermediate connector: WYJJTI type

Insulated intermediate joint: WYJJJI type

  • Rated voltage: 48/66kV, applicable to 120~1600mm²
  • Rated voltage: 64/110kV, applicable to 240~1600mm²
  • Rated voltage: 76/138kV, applicable to 240~1600mm²
  • Rated voltage: 127/220kV, applicable to 400~2500mm²

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