Address
Nanzhai village, Liushi Town, yueqingCity, zhejiang Province, china
Tel
+86-13375775325
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Product Introduction:
Detailed Product Name: 21kV Polymer-Housed Zinc Oxide Lightning Arrester
This is a 21kV Surge Arrester, a vital device for protecting electrical systems from transient overvoltages. The description below is based on the specific product image you provided.Its primary function is to protect electrical equipment like transformers, switchgear, and cables in medium-voltage networks by safely diverting high-energy voltage surges (e.g., from lightning or switching events) to the ground. The unit features a 10-shed, alternating large-and-small shed design in light grey polymer, and is characterized by a 675mm creepage distance and the inclusion of an external grading/corona ring.
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 |
Product Construction:
This Oxide Zinc Surge Arrester's design is optimized for both electrical performance and environmental durability:
Zinc Oxide (ZnO) Varistor Column: The core consists of a stack of Zinc Oxide discs sealed inside the housing. These discs have a highly non-linear voltage-current characteristic, acting as an insulator under normal 21kV system voltage and becoming a highly conductive path during an overvoltage.
Polymer Housing with Alternating Sheds: The ZnO column is encapsulated within a light grey polymer housing. The housing is molded with 10 visible sheds in an alternating "large-small" pattern. This specific design is critical for increasing the surface leakage path (creepage distance) and for effectively shedding water and contaminants like dust or salt.
Metallic Fittings and Connections:
Top Terminal: A metallic fitting with a hexagonal nut at the top provides the connection point to the high-voltage line.
High-Voltage Lead: A short, thick black lead wire extends from the top terminal down towards the base.
External Grading/Corona Ring: A distinctive feature visible in the image is a light grey, externally mounted grading ring with tooth-like projections. This ring is crucial for controlling the electric field distribution around the arrester, preventing the formation of corona discharge (which can cause radio interference and damage), especially under polluted conditions.
Grounding Connection: At the bottom, a braided copper grounding wire is securely attached, providing the low-impedance path to the earth grid for the surge current.
Key Features and Advantages:
Robust Surge Handling: A Nominal Discharge Current rating of 10kA confirms its capability to withstand severe surge events, making it suitable for areas prone to lightning.
Optimized Pollution Performance: The 675mm creepage distance, achieved by the 10-shed alternating design, ensures high resistance to surface flashovers, making the arrester reliable for use in industrial or coastal areas with higher pollution levels.
Superior Field Control: The inclusion of an external grading ring is a significant advantage. It enhances the arrester's performance and longevity by equalizing the voltage distribution across the units and suppressing harmful corona effects.
Excellent Protective Level: The ZnO varistor technology offers a very low residual voltage, meaning it clamps overvoltages to a safe level, effectively protecting downstream equipment.
Durable and Lightweight: The polymer housing provides high mechanical strength, resistance to vandalism, and UV stability, all while being much lighter than traditional porcelain equivalents, easing installation.
Production Process:
1.Varistor Disc Manufacturing: High-purity Zinc Oxide is mixed with additive oxides, pressed into discs, and sintered at high temperatures to create the ceramic varistors with non-linear properties.
2.Testing and Assembly: Varistor discs are electrically tested and assembled into a column. This column is then encapsulated within the molded polymer housing, which is created with the specific shed profile in a single, seamless process to prevent moisture ingress.
3.Component Attachment: The metallic terminals, grading ring bracket, and grounding lug are assembled.
4.Final Sealing and Testing: The unit is hermetically sealed. Each arrester undergoes final tests, including power frequency withstand voltage, residual voltage measurement at 10kA, and partial discharge tests to ensure compliance with international standards (like IEC 60099-4).
Application Scenarios:
This 21kV Silicone Surge Arrester is ideally suited for:
Distribution Substations: Protecting 21kV power transformers, circuit breakers, and busbars.
Industrial Power Systems: Safeguarding motors and switchgear within manufacturing plants.
Wind and Solar Farms: Providing overvoltage protection for the medium-voltage collector systems in renewable energy installations, which are often exposed to lightning.
Commercial Building Power Intakes: Used at the service entrance to protect critical infrastructure within large buildings.
Cable and Overhead Line Protection: Installed along distribution lines to enhance the reliability of the power network.
Company Tour:
 |  |
 |  |
 |  |  |
Product Introduction:
Detailed Product Name: 21kV Polymer-Housed Zinc Oxide Lightning Arrester
This is a 21kV Surge Arrester, a vital device for protecting electrical systems from transient overvoltages. The description below is based on the specific product image you provided.Its primary function is to protect electrical equipment like transformers, switchgear, and cables in medium-voltage networks by safely diverting high-energy voltage surges (e.g., from lightning or switching events) to the ground. The unit features a 10-shed, alternating large-and-small shed design in light grey polymer, and is characterized by a 675mm creepage distance and the inclusion of an external grading/corona ring.
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 |
Product Construction:
This Oxide Zinc Surge Arrester's design is optimized for both electrical performance and environmental durability:
Zinc Oxide (ZnO) Varistor Column: The core consists of a stack of Zinc Oxide discs sealed inside the housing. These discs have a highly non-linear voltage-current characteristic, acting as an insulator under normal 21kV system voltage and becoming a highly conductive path during an overvoltage.
Polymer Housing with Alternating Sheds: The ZnO column is encapsulated within a light grey polymer housing. The housing is molded with 10 visible sheds in an alternating "large-small" pattern. This specific design is critical for increasing the surface leakage path (creepage distance) and for effectively shedding water and contaminants like dust or salt.
Metallic Fittings and Connections:
Top Terminal: A metallic fitting with a hexagonal nut at the top provides the connection point to the high-voltage line.
High-Voltage Lead: A short, thick black lead wire extends from the top terminal down towards the base.
External Grading/Corona Ring: A distinctive feature visible in the image is a light grey, externally mounted grading ring with tooth-like projections. This ring is crucial for controlling the electric field distribution around the arrester, preventing the formation of corona discharge (which can cause radio interference and damage), especially under polluted conditions.
Grounding Connection: At the bottom, a braided copper grounding wire is securely attached, providing the low-impedance path to the earth grid for the surge current.
Key Features and Advantages:
Robust Surge Handling: A Nominal Discharge Current rating of 10kA confirms its capability to withstand severe surge events, making it suitable for areas prone to lightning.
Optimized Pollution Performance: The 675mm creepage distance, achieved by the 10-shed alternating design, ensures high resistance to surface flashovers, making the arrester reliable for use in industrial or coastal areas with higher pollution levels.
Superior Field Control: The inclusion of an external grading ring is a significant advantage. It enhances the arrester's performance and longevity by equalizing the voltage distribution across the units and suppressing harmful corona effects.
Excellent Protective Level: The ZnO varistor technology offers a very low residual voltage, meaning it clamps overvoltages to a safe level, effectively protecting downstream equipment.
Durable and Lightweight: The polymer housing provides high mechanical strength, resistance to vandalism, and UV stability, all while being much lighter than traditional porcelain equivalents, easing installation.
Production Process:
1.Varistor Disc Manufacturing: High-purity Zinc Oxide is mixed with additive oxides, pressed into discs, and sintered at high temperatures to create the ceramic varistors with non-linear properties.
2.Testing and Assembly: Varistor discs are electrically tested and assembled into a column. This column is then encapsulated within the molded polymer housing, which is created with the specific shed profile in a single, seamless process to prevent moisture ingress.
3.Component Attachment: The metallic terminals, grading ring bracket, and grounding lug are assembled.
4.Final Sealing and Testing: The unit is hermetically sealed. Each arrester undergoes final tests, including power frequency withstand voltage, residual voltage measurement at 10kA, and partial discharge tests to ensure compliance with international standards (like IEC 60099-4).
Application Scenarios:
This 21kV Silicone Surge Arrester is ideally suited for:
Distribution Substations: Protecting 21kV power transformers, circuit breakers, and busbars.
Industrial Power Systems: Safeguarding motors and switchgear within manufacturing plants.
Wind and Solar Farms: Providing overvoltage protection for the medium-voltage collector systems in renewable energy installations, which are often exposed to lightning.
Commercial Building Power Intakes: Used at the service entrance to protect critical infrastructure within large buildings.
Cable and Overhead Line Protection: Installed along distribution lines to enhance the reliability of the power network.
Company Tour:
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