Address
Nanzhai village, Liushi Town, yueqingCity, zhejiang Province, china
Tel
+86-13375775325
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Introduction:
This surge arresterr(lightning arrester) acts as a gatekeeper between the high-voltage power line and the ground. Under normal operating conditions (system voltage of 21kV), it presents a very high impedance and is effectively an open circuit. However, when a sudden voltage surge (transient) significantly exceeds the normal voltage, the arrester activates within nanoseconds. It provides a low-impedance path to earth, safely diverting the massive surge current (up to its 10kA rating) away from protected equipment. Immediately after the surge passes, it automatically resets to its high-impedance state, ensuring uninterrupted power system operation.
Drawings:
Technical Parameters：
Rated voltage: | 21kv |
Norminal discharge current: | 10kA |
Maximum continuous operating voltage (MCOV): | 17.0kv |
1/4µs steep current residual voltage: | 71.8kv |
8/20µs lightning current residual voltage : | 63kv |
30/60µs switching current residual voltage: | 54.2kv |
2000µs rectangular wave current impulse: | 250A |
4/10µs high current withstand discharge capacity : | 100KA |
Discharge classic: | 1 |
Creepage distance: | 675mm |
Internal Structure & Mechanism:
This polymer surge arrester's sophisticated protection stems from its robust internal construction:
Zinc Oxide (ZnO) Varistor Discs (The Core): The heart of the arrester is a stack of metal oxide varistor discs, primarily made of Zinc Oxide grains mixed with other metal oxides. These discs possess an extremely non-linear voltage-current characteristic.
Normal Operation: At standard system voltage, the discs act as an insulator, allowing only a tiny leakage current (microamps) to flow.
Surge Condition: When a transient overvoltage occurs, the ZnO grains' boundaries become highly conductive, allowing the arrester to clamp the voltage and safely discharge the high current (10kA) to ground.
Insulating Housing & Sheds: The ZnO column is housed within a high-strength insulating material (typically porcelain or polymer). The external profile features 10 sheds in a large-small alternating pattern. This design is crucial for increasing the creepage distance to 675mm, which is the total path length along the surface between the live and grounded ends. This long path prevents flashovers in polluted or humid conditions.
Metal Fittings:
Top Terminal: A metallic cap with a stud for connection to the high-voltage line.
Side Terminal/Grounding: A side terminal is fitted with a white, finned corona ring. This ring controls the electric field distribution to prevent corona discharge (a source of radio interference and power loss). A short copper bonding wire is attached here for connection to the ground wire.
Sealing System: Hermetic seals at the ends prevent moisture from entering the core, which is vital for long-term stability and preventing internal damage.
Key Design Features:
Excellent Pollution Performance: The 10-shed, large-small alternation design and the substantial 675mm creepage distance make this arrester highly reliable in areas with high contamination levels, such as coastal (salt), industrial (dust, chemicals), or desert environments.
High Energy Handling Capacity: The 10kA nominal discharge current rating confirms its robustness in handling severe lightning and switching surges.
Superior Protective Performance: Zinc Oxide varistors offer excellent voltage-clamping characteristics, ensuring that the voltage across the protected equipment is kept to a safe level.
Corona Control: The inclusion of a corona ring at the terminal minimizes radio frequency interference and prevents energy loss due to corona effects, which is essential for modern power quality.
Durability: The housing material (whether high-grade polymer or porcelain) provides high mechanical strength, resistance to UV radiation, and vandalism.
Production Process:
The manufacturing of composite surge arrester involves precision engineering and rigorous quality control:
Varistor Production: High-purity Zinc Oxide powder is mixed with specific additives, pressed into discs, and sintered at high temperatures to form the polycrystalline ceramic varistors with the desired non-linear properties.
Core Assembly: Electrically tested varistor discs are stacked under precise pressure on a fiberglass-reinforced epoxy rod to form the active core.
Housing Application: The core is either encapsulated by injection molding with silicone rubber (for polymer-housed arresters) or placed within a porcelain shell and sealed with an anti-tracking compound.
Assembly and Sealing: Metal end fittings and the corona ring are assembled. Critical hermetic seals are applied to ensure a moisture-proof unit.
Final Testing: Each unit undergoes high-voltage tests, impulse current tests (to verify the 10kA rating), and leakage current measurements.
Specific Application Scenarios:
This 21kV, 10kA high voltage surge arrester is ideally suited for:
Distribution Substations: Protecting the primary side of 11kV/22kV distribution transformers.
Overhead Lines: Mounted on poles to protect lines, capacitor banks, and reclosers.
Industrial Plants: Shielding medium-voltage switchgear and large motors in manufacturing facilities.
Renewable Energy Systems: Providing overvoltage protection for the electrical systems of wind farms and solar power plants.
Critical Infrastructure: Used in networks where reliability is paramount, especially in regions prone to high lightning activity or industrial pollution.
Company Strength:
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Introduction:
This surge arresterr(lightning arrester) acts as a gatekeeper between the high-voltage power line and the ground. Under normal operating conditions (system voltage of 21kV), it presents a very high impedance and is effectively an open circuit. However, when a sudden voltage surge (transient) significantly exceeds the normal voltage, the arrester activates within nanoseconds. It provides a low-impedance path to earth, safely diverting the massive surge current (up to its 10kA rating) away from protected equipment. Immediately after the surge passes, it automatically resets to its high-impedance state, ensuring uninterrupted power system operation.
Drawings:
Technical Parameters：
Rated voltage: | 21kv |
Norminal discharge current: | 10kA |
Maximum continuous operating voltage (MCOV): | 17.0kv |
1/4µs steep current residual voltage: | 71.8kv |
8/20µs lightning current residual voltage : | 63kv |
30/60µs switching current residual voltage: | 54.2kv |
2000µs rectangular wave current impulse: | 250A |
4/10µs high current withstand discharge capacity : | 100KA |
Discharge classic: | 1 |
Creepage distance: | 675mm |
Internal Structure & Mechanism:
This polymer surge arrester's sophisticated protection stems from its robust internal construction:
Zinc Oxide (ZnO) Varistor Discs (The Core): The heart of the arrester is a stack of metal oxide varistor discs, primarily made of Zinc Oxide grains mixed with other metal oxides. These discs possess an extremely non-linear voltage-current characteristic.
Normal Operation: At standard system voltage, the discs act as an insulator, allowing only a tiny leakage current (microamps) to flow.
Surge Condition: When a transient overvoltage occurs, the ZnO grains' boundaries become highly conductive, allowing the arrester to clamp the voltage and safely discharge the high current (10kA) to ground.
Insulating Housing & Sheds: The ZnO column is housed within a high-strength insulating material (typically porcelain or polymer). The external profile features 10 sheds in a large-small alternating pattern. This design is crucial for increasing the creepage distance to 675mm, which is the total path length along the surface between the live and grounded ends. This long path prevents flashovers in polluted or humid conditions.
Metal Fittings:
Top Terminal: A metallic cap with a stud for connection to the high-voltage line.
Side Terminal/Grounding: A side terminal is fitted with a white, finned corona ring. This ring controls the electric field distribution to prevent corona discharge (a source of radio interference and power loss). A short copper bonding wire is attached here for connection to the ground wire.
Sealing System: Hermetic seals at the ends prevent moisture from entering the core, which is vital for long-term stability and preventing internal damage.
Key Design Features:
Excellent Pollution Performance: The 10-shed, large-small alternation design and the substantial 675mm creepage distance make this arrester highly reliable in areas with high contamination levels, such as coastal (salt), industrial (dust, chemicals), or desert environments.
High Energy Handling Capacity: The 10kA nominal discharge current rating confirms its robustness in handling severe lightning and switching surges.
Superior Protective Performance: Zinc Oxide varistors offer excellent voltage-clamping characteristics, ensuring that the voltage across the protected equipment is kept to a safe level.
Corona Control: The inclusion of a corona ring at the terminal minimizes radio frequency interference and prevents energy loss due to corona effects, which is essential for modern power quality.
Durability: The housing material (whether high-grade polymer or porcelain) provides high mechanical strength, resistance to UV radiation, and vandalism.
Production Process:
The manufacturing of composite surge arrester involves precision engineering and rigorous quality control:
Varistor Production: High-purity Zinc Oxide powder is mixed with specific additives, pressed into discs, and sintered at high temperatures to form the polycrystalline ceramic varistors with the desired non-linear properties.
Core Assembly: Electrically tested varistor discs are stacked under precise pressure on a fiberglass-reinforced epoxy rod to form the active core.
Housing Application: The core is either encapsulated by injection molding with silicone rubber (for polymer-housed arresters) or placed within a porcelain shell and sealed with an anti-tracking compound.
Assembly and Sealing: Metal end fittings and the corona ring are assembled. Critical hermetic seals are applied to ensure a moisture-proof unit.
Final Testing: Each unit undergoes high-voltage tests, impulse current tests (to verify the 10kA rating), and leakage current measurements.
Specific Application Scenarios:
This 21kV, 10kA high voltage surge arrester is ideally suited for:
Distribution Substations: Protecting the primary side of 11kV/22kV distribution transformers.
Overhead Lines: Mounted on poles to protect lines, capacitor banks, and reclosers.
Industrial Plants: Shielding medium-voltage switchgear and large motors in manufacturing facilities.
Renewable Energy Systems: Providing overvoltage protection for the electrical systems of wind farms and solar power plants.
Critical Infrastructure: Used in networks where reliability is paramount, especially in regions prone to high lightning activity or industrial pollution.
Company Strength:
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