Introduction on Cable Accessories for 48/66~290/500kV
48/66kV~290/500kV high voltage cable accessories can be classified as porcelain bushing outdoor termination, composite bushing outdoor termination, full-prefabricated soft dry type outdoor termination, GIS termination, full-prefabricated silicone rubber straight through /insulating joint, assembled joint applied to any cross section, single-phase type and three-phase type for fully dry insulating branch joint, grounding box, and grounding protection box, interconnected box and sheath protector, etc.
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The 138kV GIS (Gas Insulated Switchgear) Termination is a critical component for high-voltage power transmission systems, designed to safely connect power cables to GIS equipment while maintaining optimal insulation and mechanical stability. This termination is engineered to operate at 138kV, a common voltage level in regional and sub-transmission networks, and is compatible with sulfur hexafluoride (SF6) or eco-friendly gas-insulated switchgear systems.
Constructed with high-quality epoxy resin or composite materials, the termination provides excellent electrical insulation and resistance to environmental factors such as moisture, dust, and chemical contaminants. The inner conductor is made of electrolytic-grade copper or aluminum, ensuring low electrical resistance and minimal power loss. The design incorporates stress control cones to evenly distribute electrical fields, preventing partial discharges and enhancing long-term reliability in high-voltage applications.
High-Voltage Stability: Engineered to withstand the rigorous electrical and thermal demands of 138kV systems, with a focus on minimizing corona discharge and field concentration.
Compact Design: Unlike traditional porcelain terminations, the GIS termination features a space-saving design that fits seamlessly into modern compact switchgear layouts, reducing overall substation footprint.
Maintenance-Free Operation: The hermetically sealed construction prevents gas leakage and external contaminant ingress, eliminating the need for regular maintenance or reconditioning.
Environmental Resilience: Made from hydrophobic materials that repel moisture, the termination is suitable for use in humid, coastal, or polluted environments without compromising performance.
Easy Installation: Designed for quick and safe attachment to GIS cabinets, with standardized interfaces that comply with international standards (IEC 62271-102), reducing installation time and labor costs.
High-Voltage Substations: Connects transmission cables to GIS switchgear, circuit breakers, and transformers in regional power grids.
Industrial Power Systems: Used in large-scale manufacturing plants, refineries, and petrochemical facilities requiring reliable high-voltage distribution.
Renewable Energy Projects: Integrates with wind farms and solar plants to connect generation units to the main transmission network, ensuring efficient power evacuation.
Urban Substations: The compact design is ideal for space-constrained urban areas where traditional bulky terminations are impractical.
Underground Cable Systems: Bridges the gap between underground transmission cables and overhead GIS equipment, providing a secure transition point.
Q: What is the maximum operating temperature of the GIS termination?
A: It is designed to operate at temperatures up to 90°C (conductor temperature) under full load, with ambient temperatures ranging from -40°C to +50°C.
Q: Is the termination compatible with non-SF6 gas-insulated systems?
A: Yes, it can be adapted for use with environmentally friendly gas mixtures such as nitrogen or fluoronitrile-based gases, depending on customer requirements.
Q: How is electrical stress managed at the termination interface?
A: Stress control electrodes and graded insulation materials are used to ensure uniform electric field distribution, preventing flashovers and partial discharges.
Q: Can the termination be used in outdoor GIS installations?
A: Yes, the composite material housing provides protection against outdoor elements, making it suitable for both indoor and outdoor applications.
Q: What is the standard testing procedure for this termination?
A: It undergoes rigorous type testing including high-voltage withstand, partial discharge, thermal cycling, and mechanical impact tests to comply with IEC and national standards.
The 138kV GIS (Gas Insulated Switchgear) Termination is a critical component for high-voltage power transmission systems, designed to safely connect power cables to GIS equipment while maintaining optimal insulation and mechanical stability. This termination is engineered to operate at 138kV, a common voltage level in regional and sub-transmission networks, and is compatible with sulfur hexafluoride (SF6) or eco-friendly gas-insulated switchgear systems.
Constructed with high-quality epoxy resin or composite materials, the termination provides excellent electrical insulation and resistance to environmental factors such as moisture, dust, and chemical contaminants. The inner conductor is made of electrolytic-grade copper or aluminum, ensuring low electrical resistance and minimal power loss. The design incorporates stress control cones to evenly distribute electrical fields, preventing partial discharges and enhancing long-term reliability in high-voltage applications.
High-Voltage Stability: Engineered to withstand the rigorous electrical and thermal demands of 138kV systems, with a focus on minimizing corona discharge and field concentration.
Compact Design: Unlike traditional porcelain terminations, the GIS termination features a space-saving design that fits seamlessly into modern compact switchgear layouts, reducing overall substation footprint.
Maintenance-Free Operation: The hermetically sealed construction prevents gas leakage and external contaminant ingress, eliminating the need for regular maintenance or reconditioning.
Environmental Resilience: Made from hydrophobic materials that repel moisture, the termination is suitable for use in humid, coastal, or polluted environments without compromising performance.
Easy Installation: Designed for quick and safe attachment to GIS cabinets, with standardized interfaces that comply with international standards (IEC 62271-102), reducing installation time and labor costs.
High-Voltage Substations: Connects transmission cables to GIS switchgear, circuit breakers, and transformers in regional power grids.
Industrial Power Systems: Used in large-scale manufacturing plants, refineries, and petrochemical facilities requiring reliable high-voltage distribution.
Renewable Energy Projects: Integrates with wind farms and solar plants to connect generation units to the main transmission network, ensuring efficient power evacuation.
Urban Substations: The compact design is ideal for space-constrained urban areas where traditional bulky terminations are impractical.
Underground Cable Systems: Bridges the gap between underground transmission cables and overhead GIS equipment, providing a secure transition point.
Q: What is the maximum operating temperature of the GIS termination?
A: It is designed to operate at temperatures up to 90°C (conductor temperature) under full load, with ambient temperatures ranging from -40°C to +50°C.
Q: Is the termination compatible with non-SF6 gas-insulated systems?
A: Yes, it can be adapted for use with environmentally friendly gas mixtures such as nitrogen or fluoronitrile-based gases, depending on customer requirements.
Q: How is electrical stress managed at the termination interface?
A: Stress control electrodes and graded insulation materials are used to ensure uniform electric field distribution, preventing flashovers and partial discharges.
Q: Can the termination be used in outdoor GIS installations?
A: Yes, the composite material housing provides protection against outdoor elements, making it suitable for both indoor and outdoor applications.
Q: What is the standard testing procedure for this termination?
A: It undergoes rigorous type testing including high-voltage withstand, partial discharge, thermal cycling, and mechanical impact tests to comply with IEC and national standards.
