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The 64/110kV Fully Fabricated Type Insulating Power Cable Joint is a pre-engineered solution designed for reliable and efficient connection of high-voltage power cables in underground and overhead systems. This joint eliminates on-site insulation processing by incorporating factory-molded insulation components, ensuring consistent quality and performance. Constructed with high-purity EPDM rubber or silicon rubber insulation, the joint provides excellent electrical insulation, mechanical strength, and resistance to environmental stress.
The joint features a modular design with pre-stressed insulation layers and stress control cones to evenly distribute electric fields, preventing partial discharges and enhancing long-term reliability. The outer sheath is made from UV-stabilized polyethylene or polyurethane, offering protection against moisture, chemicals, and mechanical abrasion. Factory testing includes partial discharge, voltage withstand, and thermal cycling tests to ensure compliance with IEC 61442 and EN 50673 standards.
Factory-Prefabricated Design: Reduces on-site installation time by 50% compared to traditional hand-built joints, with no need for specialized tools or cleanroom environments.
High Electrical Performance: Stress control technology ensures a uniform electric field distribution, with partial discharge levels below 10pC at rated voltage.
Environmental Resilience: The waterproof, gas-tight seal prevents moisture ingress, making it suitable for submerged installations, wetlands, and high-water table areas.
Mechanical Durability: Withstands axial tensile forces up to 50kN and radial compression from soil or concrete encasement, ensuring stability in seismic or high-traffic zones.
Wide Temperature Range: Operates reliably from -40°C to +90°C, accommodating thermal expansion of cables and extreme climatic conditions.
Submarine Cable Systems: Connects undersea power cables in offshore wind farms and intercontinental grids, with watertight designs meeting marine standards.
Urban Underground Grids: Used in crowded urban areas for connecting 64kV and 110kV underground cables, minimizing space requirements and installation complexity.
Industrial Power Distribution: Links high-voltage cables in petrochemical plants, steel mills, and large-scale manufacturing facilities, ensuring uninterrupted power flow.
Renewable Energy Integration: Joins cables in solar farms and wind parks, enduring mechanical vibrations and voltage fluctuations from renewable sources.
Overhead-to-Underground Transitions: Provides a secure connection point when transitioning from overhead lines to underground cables in substation entrances.
Q: Can the joint be installed in direct burial applications?
A: Yes, the outer sheath is designed for direct burial, with resistance to soil chemicals and microbial corrosion.
Q: What is the maximum cable diameter the joint can accommodate?
A: It is available in sizes for cable cross-sections ranging from 240mm² to 1200mm², with custom sizes available for special requirements.
Q: How is the joint sealed against water ingress?
A: Multiple layers of rubber O-rings and adhesive seals create a hermetic barrier, tested to withstand water pressure up to 10 bar for submerged applications.
Q: Does the joint require grounding?
A: Yes, a grounding strip is integrated into the design for safe discharge of induced currents, compliant with IEC grounding standards.
Q: What is the expected service life of the joint?
A: Under normal operating conditions, it has a service life of 30-40 years, matching the lifespan of high-voltage power cables.
Size mm | 48/66kV | 64/110kV | 80/138kV | 127/220kV |
L | 1600 | 1600 | 1632 | 1760 |
A | 2000 | 2100 | 2200 | 2400 |
| Parameter | Description |
|---|---|
| Rated Voltage (U₀/U/Um) | - U₀: Rated power frequency voltage between conductor and earth (kV) - U: Rated system voltage (kV) - Um: Maximum system voltage (kV) |
| Lightning Impulse Withstand Voltage (LIWV) | Peak voltage the joint can withstand during lightning strikes (e.g., 95 kV, 170 kV, 250 kV) |
| Power Frequency Withstand Voltage | AC voltage withstand capability (e.g., 22 kV for 5 mins) |
| Partial Discharge Level | Should be minimal (e.g., <10 pC at 1.5U₀) |
| Current Rating (A) | Continuous current-carrying capacity (depends on conductor size & material) |
| Short-Circuit Current (kA, 1s or 3s) | Maximum fault current the joint can handle without damage |
Item | Test requirement | Test type | Products type | ||||||
48/66 | 64/110 | 127/220 | Porcelain bushing | Composite busing | GIS termination | Straight through/ Insulating joint | Soft dry type termination | ||
Sealing fittings, porcelain bushing, composite bushing | 0.25±0.01MPa/1h, no leakage | R | ✔ | ✔ | ✔ | — | — | ||
Epoxy bushing | 0.6~0.7MPa/1h, no leakage | ||||||||
Prefabricated body partial discharge test | 72kV | 96kV | 190kV | R | ✔ | ✔ | ✔ | ✔ | ✔ |
Partial discharge in the background | |||||||||
Prefabricated body power frequency withstand voltage test | 120kV | 160kV | 318kV | R | ✔ | ✔ | ✔ | ✔ | ✔ |
30min, no flashover no breakdown | |||||||||
Partial discharge test at ambient temperature | 72kV | 96kV | 190kV | T | ✔ | ✔ | ✔ | ✔ | ✔ |
Partial discharge in the background | |||||||||
Thermal cycling voltage test | 96kV | 128kV | 254kV | T | ✔ | ✔ | ✔ | ✔ | ✔ |
20 cycles, no flashover no breakdown | |||||||||
Partial discharge at high temperature | 72kV | 96kV | 190kV | T | ✔ | ✔ | ✔ | ✔ | ✔ |
Partial discharge in the background | |||||||||
Lighting impulse voltage test and the subsequent power frequency withstand voltage test | 450kV | 550kV | 1050kV | T | ✔ | ✔ | ✔ | ✔ | ✔ |
10 times, no flashover no breakdown | |||||||||
120kV | 160kV | 318kV | |||||||
15min, no flashover no breakdown | |||||||||
Immersion voltage test on outer protective sheath of direct-buried joint | 60/75kV impact both ends, 30/37.5kV impact one end to the ground | 60/95kVimpact both ends, 30/47.5kV impact one end to the ground | T | — | — | — | ✔ | — | |
Sealing test after installing accessories | 0.25±0.01MPa/1h, no leakage | T | ✔ | ✔ | ✔ | ✔ | ✔ | ||
Outdoor termination frequency voltage test in rain | 140kV | 185kV | 460kV | T | ✔ | ✔ | — | — | ✔ |
1min, no flashover no breakdown | |||||||||
Post insulator voltage test | 20kV/1min, no flashover no breakdown | T | ✔ | ✔ | — | — | — | ||
Outdoor termination radio interference test | 61kV | 81kV | 140kV | A | ✔ | ✔ | — | — | ✔ |
1MHz radio interference, voltage≤450μV | 1MHz radio interference, voltage≤500μV | ||||||||
Accessories sample test | Detect accessories system, no significant errors effect operating | T | ✔ | ✔ | ✔ | ✔ | ✔ | ||
DC voltage test | / | 20kV/1min between inner conductor and metallic screen of joint, no breakdown | T | — | — | — | ✔ | — | |
Conductor connecting pole (tube) pressure welding fitting performance test | After crimping, the total resistance is not 1.2 times more than the same length and cross sectional area of conductor | T | ✔ | ✔ | ✔ | ✔ | ✔ | ||
The 64/110kV Fully Fabricated Type Insulating Power Cable Joint is a pre-engineered solution designed for reliable and efficient connection of high-voltage power cables in underground and overhead systems. This joint eliminates on-site insulation processing by incorporating factory-molded insulation components, ensuring consistent quality and performance. Constructed with high-purity EPDM rubber or silicon rubber insulation, the joint provides excellent electrical insulation, mechanical strength, and resistance to environmental stress.
The joint features a modular design with pre-stressed insulation layers and stress control cones to evenly distribute electric fields, preventing partial discharges and enhancing long-term reliability. The outer sheath is made from UV-stabilized polyethylene or polyurethane, offering protection against moisture, chemicals, and mechanical abrasion. Factory testing includes partial discharge, voltage withstand, and thermal cycling tests to ensure compliance with IEC 61442 and EN 50673 standards.
Factory-Prefabricated Design: Reduces on-site installation time by 50% compared to traditional hand-built joints, with no need for specialized tools or cleanroom environments.
High Electrical Performance: Stress control technology ensures a uniform electric field distribution, with partial discharge levels below 10pC at rated voltage.
Environmental Resilience: The waterproof, gas-tight seal prevents moisture ingress, making it suitable for submerged installations, wetlands, and high-water table areas.
Mechanical Durability: Withstands axial tensile forces up to 50kN and radial compression from soil or concrete encasement, ensuring stability in seismic or high-traffic zones.
Wide Temperature Range: Operates reliably from -40°C to +90°C, accommodating thermal expansion of cables and extreme climatic conditions.
Submarine Cable Systems: Connects undersea power cables in offshore wind farms and intercontinental grids, with watertight designs meeting marine standards.
Urban Underground Grids: Used in crowded urban areas for connecting 64kV and 110kV underground cables, minimizing space requirements and installation complexity.
Industrial Power Distribution: Links high-voltage cables in petrochemical plants, steel mills, and large-scale manufacturing facilities, ensuring uninterrupted power flow.
Renewable Energy Integration: Joins cables in solar farms and wind parks, enduring mechanical vibrations and voltage fluctuations from renewable sources.
Overhead-to-Underground Transitions: Provides a secure connection point when transitioning from overhead lines to underground cables in substation entrances.
Q: Can the joint be installed in direct burial applications?
A: Yes, the outer sheath is designed for direct burial, with resistance to soil chemicals and microbial corrosion.
Q: What is the maximum cable diameter the joint can accommodate?
A: It is available in sizes for cable cross-sections ranging from 240mm² to 1200mm², with custom sizes available for special requirements.
Q: How is the joint sealed against water ingress?
A: Multiple layers of rubber O-rings and adhesive seals create a hermetic barrier, tested to withstand water pressure up to 10 bar for submerged applications.
Q: Does the joint require grounding?
A: Yes, a grounding strip is integrated into the design for safe discharge of induced currents, compliant with IEC grounding standards.
Q: What is the expected service life of the joint?
A: Under normal operating conditions, it has a service life of 30-40 years, matching the lifespan of high-voltage power cables.
Size mm | 48/66kV | 64/110kV | 80/138kV | 127/220kV |
L | 1600 | 1600 | 1632 | 1760 |
A | 2000 | 2100 | 2200 | 2400 |
| Parameter | Description |
|---|---|
| Rated Voltage (U₀/U/Um) | - U₀: Rated power frequency voltage between conductor and earth (kV) - U: Rated system voltage (kV) - Um: Maximum system voltage (kV) |
| Lightning Impulse Withstand Voltage (LIWV) | Peak voltage the joint can withstand during lightning strikes (e.g., 95 kV, 170 kV, 250 kV) |
| Power Frequency Withstand Voltage | AC voltage withstand capability (e.g., 22 kV for 5 mins) |
| Partial Discharge Level | Should be minimal (e.g., <10 pC at 1.5U₀) |
| Current Rating (A) | Continuous current-carrying capacity (depends on conductor size & material) |
| Short-Circuit Current (kA, 1s or 3s) | Maximum fault current the joint can handle without damage |
Item | Test requirement | Test type | Products type | ||||||
48/66 | 64/110 | 127/220 | Porcelain bushing | Composite busing | GIS termination | Straight through/ Insulating joint | Soft dry type termination | ||
Sealing fittings, porcelain bushing, composite bushing | 0.25±0.01MPa/1h, no leakage | R | ✔ | ✔ | ✔ | — | — | ||
Epoxy bushing | 0.6~0.7MPa/1h, no leakage | ||||||||
Prefabricated body partial discharge test | 72kV | 96kV | 190kV | R | ✔ | ✔ | ✔ | ✔ | ✔ |
Partial discharge in the background | |||||||||
Prefabricated body power frequency withstand voltage test | 120kV | 160kV | 318kV | R | ✔ | ✔ | ✔ | ✔ | ✔ |
30min, no flashover no breakdown | |||||||||
Partial discharge test at ambient temperature | 72kV | 96kV | 190kV | T | ✔ | ✔ | ✔ | ✔ | ✔ |
Partial discharge in the background | |||||||||
Thermal cycling voltage test | 96kV | 128kV | 254kV | T | ✔ | ✔ | ✔ | ✔ | ✔ |
20 cycles, no flashover no breakdown | |||||||||
Partial discharge at high temperature | 72kV | 96kV | 190kV | T | ✔ | ✔ | ✔ | ✔ | ✔ |
Partial discharge in the background | |||||||||
Lighting impulse voltage test and the subsequent power frequency withstand voltage test | 450kV | 550kV | 1050kV | T | ✔ | ✔ | ✔ | ✔ | ✔ |
10 times, no flashover no breakdown | |||||||||
120kV | 160kV | 318kV | |||||||
15min, no flashover no breakdown | |||||||||
Immersion voltage test on outer protective sheath of direct-buried joint | 60/75kV impact both ends, 30/37.5kV impact one end to the ground | 60/95kVimpact both ends, 30/47.5kV impact one end to the ground | T | — | — | — | ✔ | — | |
Sealing test after installing accessories | 0.25±0.01MPa/1h, no leakage | T | ✔ | ✔ | ✔ | ✔ | ✔ | ||
Outdoor termination frequency voltage test in rain | 140kV | 185kV | 460kV | T | ✔ | ✔ | — | — | ✔ |
1min, no flashover no breakdown | |||||||||
Post insulator voltage test | 20kV/1min, no flashover no breakdown | T | ✔ | ✔ | — | — | — | ||
Outdoor termination radio interference test | 61kV | 81kV | 140kV | A | ✔ | ✔ | — | — | ✔ |
1MHz radio interference, voltage≤450μV | 1MHz radio interference, voltage≤500μV | ||||||||
Accessories sample test | Detect accessories system, no significant errors effect operating | T | ✔ | ✔ | ✔ | ✔ | ✔ | ||
DC voltage test | / | 20kV/1min between inner conductor and metallic screen of joint, no breakdown | T | — | — | — | ✔ | — | |
Conductor connecting pole (tube) pressure welding fitting performance test | After crimping, the total resistance is not 1.2 times more than the same length and cross sectional area of conductor | T | ✔ | ✔ | ✔ | ✔ | ✔ | ||
