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The 76/132kV Porcelain Bushing Type Outdoor Power Cable Termination is a robust, high-voltage solution designed for terminating power cables in outdoor substations and overhead transmission systems. Combining a porcelain insulator with a precision-engineered metal fitting, this termination provides excellent electrical insulation, mechanical strength, and resistance to harsh outdoor environments. The porcelain bushing is glazed to enhance hydrophobicity and prevent pollution flashover, while the inner conductor connection features compression or bolted joints for low-resistance conductivity.
Engineered to operate at 76kV and 132kV, the termination incorporates stress control electrodes to manage electrical field gradients at the cable-insulation interface, reducing the risk of partial discharges. The porcelain housing is designed with multiple sheds to increase creepage distance, making it suitable for polluted areas with high levels of dust, salt, or industrial fallout. The metallic base is hot-dip galvanized to resist corrosion, ensuring long-term reliability in coastal or industrial zones.
Superior Insulation Performance: The porcelain bushing offers high dielectric strength and thermal shock resistance, with a flashover voltage 20% higher than composite alternatives in clean environments.
Pollution Resistance: The glazed surface and shed profile minimize contaminant accumulation, with 可选防污闪涂层 (optional anti-pollution coatings) available for severe pollution classes (IV-V).
Mechanical Robustness: Withstands wind speeds up to 300km/h and ice loads of 50mm thickness, making it suitable for extreme weather conditions.
Easy Installation: Standardized flange interfaces comply with IEC 60137 and ANSI C57.19, allowing quick integration with switchgear, transformers, and busbars.
Low Maintenance: Porcelain’s inert surface requires minimal cleaning—typically pressure washing every 5-7 years in polluted areas.
Outdoor Substations: Terminates high-voltage cables connected to circuit breakers, transformers, and lightning arresters in regional and national grids.
Coastal Power Plants: The corrosion-resistant galvanized steel and glazed porcelain ensure longevity in salt-laden marine environments.
Industrial Substations: Used in steel plants, refineries, and chemical facilities, resisting chemical vapors and conductive dust through specialized coatings.
High-Altitude Grids: Performs reliably at altitudes up to 4000 meters, with increased creepage distance compensating for reduced air density.
Renovation Projects: Retrofits older substation infrastructure, replacing degraded terminations with maintenance-free porcelain solutions.
Q: What is the difference between normal and heavy pollution class terminations?
A: Heavy pollution class terminations have taller sheds and increased creepage distance (e.g., 3100mm for 132kV), suitable for areas with conductivity >100μS/cm.
Q: Can the porcelain bushing withstand physical impacts?
A: While porcelain is brittle, the termination is designed with a shock-absorbing flange to minimize damage from vibrations or minor impacts.
Q: Is the termination compatible with both oil-filled and XLPE-insulated cables?
A: Yes, it supports various cable types with adaptable insulation interfaces and sealing mechanisms.
Q: How is the electrical stress managed at the cable termination point?
A: A graded stress cone made of semi-conductive material equalizes the electric field, preventing concentration at the insulation shield cut-off.
Q: What is the recommended torque for conductor connections?
A: Torque values depend on cable size (e.g., 100-200Nm for 500mm² cables), detailed in the installation manual to ensure low-resistance connections.
1. Outlet clamp 2. Grading shield 3. Core insulation 4. Polyisobutylene 5. Porcelain bushing 6. Stress cone 7. Fixed plate 8. Support insulator 9. Tail pipe 10. Cable
Size mm | 48/66kV | 64/110kV | 80/138kV | 127/220kV |
H | 1270 | 1500 | 1750 | 2500 |
A | 1510 | 1935 | 2085 | 3100 |
B | 1925 | 2155 | 2400 | 3600 |
C | 450 | 450 | 450 | 650 |
D | 200 | 200 | 200 | 300 |
E | Φ22 | Φ22 | Φ22 | Φ32 |
Creepage distance | ≥2248 | ≥3906 | ≥4495 | ≥7812 |
| Parameter | Description |
|---|---|
| Rated Voltage (Ur) | System voltage (e.g., 11 kV, 33 kV, 132 kV) |
| Lightning Impulse Withstand Voltage (BIL) | Peak voltage the bushing can withstand (e.g., 95 kV for 11 kV systems, 550 kV for 132 kV) |
| Power Frequency Withstand Voltage (1 min AC) | Short-duration AC withstand test voltage (e.g., 28 kV for 11 kV, 230 kV for 132 kV) |
| Partial Discharge Level | Maximum allowable PD (typically <10 pC for HV bushings) |
| Creepage Distance | Minimum surface distance to prevent flashover (depends on pollution level) |
| Dielectric Loss (Tan δ) | Measure of insulation quality (should be low, e.g., <0.5%) |
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 76/132kV Porcelain Bushing Type Outdoor Power Cable Termination is a robust, high-voltage solution designed for terminating power cables in outdoor substations and overhead transmission systems. Combining a porcelain insulator with a precision-engineered metal fitting, this termination provides excellent electrical insulation, mechanical strength, and resistance to harsh outdoor environments. The porcelain bushing is glazed to enhance hydrophobicity and prevent pollution flashover, while the inner conductor connection features compression or bolted joints for low-resistance conductivity.
Engineered to operate at 76kV and 132kV, the termination incorporates stress control electrodes to manage electrical field gradients at the cable-insulation interface, reducing the risk of partial discharges. The porcelain housing is designed with multiple sheds to increase creepage distance, making it suitable for polluted areas with high levels of dust, salt, or industrial fallout. The metallic base is hot-dip galvanized to resist corrosion, ensuring long-term reliability in coastal or industrial zones.
Superior Insulation Performance: The porcelain bushing offers high dielectric strength and thermal shock resistance, with a flashover voltage 20% higher than composite alternatives in clean environments.
Pollution Resistance: The glazed surface and shed profile minimize contaminant accumulation, with 可选防污闪涂层 (optional anti-pollution coatings) available for severe pollution classes (IV-V).
Mechanical Robustness: Withstands wind speeds up to 300km/h and ice loads of 50mm thickness, making it suitable for extreme weather conditions.
Easy Installation: Standardized flange interfaces comply with IEC 60137 and ANSI C57.19, allowing quick integration with switchgear, transformers, and busbars.
Low Maintenance: Porcelain’s inert surface requires minimal cleaning—typically pressure washing every 5-7 years in polluted areas.
Outdoor Substations: Terminates high-voltage cables connected to circuit breakers, transformers, and lightning arresters in regional and national grids.
Coastal Power Plants: The corrosion-resistant galvanized steel and glazed porcelain ensure longevity in salt-laden marine environments.
Industrial Substations: Used in steel plants, refineries, and chemical facilities, resisting chemical vapors and conductive dust through specialized coatings.
High-Altitude Grids: Performs reliably at altitudes up to 4000 meters, with increased creepage distance compensating for reduced air density.
Renovation Projects: Retrofits older substation infrastructure, replacing degraded terminations with maintenance-free porcelain solutions.
Q: What is the difference between normal and heavy pollution class terminations?
A: Heavy pollution class terminations have taller sheds and increased creepage distance (e.g., 3100mm for 132kV), suitable for areas with conductivity >100μS/cm.
Q: Can the porcelain bushing withstand physical impacts?
A: While porcelain is brittle, the termination is designed with a shock-absorbing flange to minimize damage from vibrations or minor impacts.
Q: Is the termination compatible with both oil-filled and XLPE-insulated cables?
A: Yes, it supports various cable types with adaptable insulation interfaces and sealing mechanisms.
Q: How is the electrical stress managed at the cable termination point?
A: A graded stress cone made of semi-conductive material equalizes the electric field, preventing concentration at the insulation shield cut-off.
Q: What is the recommended torque for conductor connections?
A: Torque values depend on cable size (e.g., 100-200Nm for 500mm² cables), detailed in the installation manual to ensure low-resistance connections.
1. Outlet clamp 2. Grading shield 3. Core insulation 4. Polyisobutylene 5. Porcelain bushing 6. Stress cone 7. Fixed plate 8. Support insulator 9. Tail pipe 10. Cable
Size mm | 48/66kV | 64/110kV | 80/138kV | 127/220kV |
H | 1270 | 1500 | 1750 | 2500 |
A | 1510 | 1935 | 2085 | 3100 |
B | 1925 | 2155 | 2400 | 3600 |
C | 450 | 450 | 450 | 650 |
D | 200 | 200 | 200 | 300 |
E | Φ22 | Φ22 | Φ22 | Φ32 |
Creepage distance | ≥2248 | ≥3906 | ≥4495 | ≥7812 |
| Parameter | Description |
|---|---|
| Rated Voltage (Ur) | System voltage (e.g., 11 kV, 33 kV, 132 kV) |
| Lightning Impulse Withstand Voltage (BIL) | Peak voltage the bushing can withstand (e.g., 95 kV for 11 kV systems, 550 kV for 132 kV) |
| Power Frequency Withstand Voltage (1 min AC) | Short-duration AC withstand test voltage (e.g., 28 kV for 11 kV, 230 kV for 132 kV) |
| Partial Discharge Level | Maximum allowable PD (typically <10 pC for HV bushings) |
| Creepage Distance | Minimum surface distance to prevent flashover (depends on pollution level) |
| Dielectric Loss (Tan δ) | Measure of insulation quality (should be low, e.g., <0.5%) |
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 | ✔ | ✔ | ✔ | ✔ | ✔ | ||
