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Product Introduction:
Detailed Product Name: 33kV Polymer Surge Arrester
This document provides a comprehensive overview of the 33kV Metal Oxide Surge Arrester (MOA), a critical component designed for overvoltage protection in medium-voltage power systems.
This Composite Surge Arrester is an advanced electrical device engineered to safeguard valuable equipment in power distribution networks by diverting dangerous voltage transients, such as those caused by lightning strikes or switching operations, safely to the ground. Its robust design, highlighted by a 16-shed profile and a substantial 1080mm creepage distance, ensures high reliability even in demanding environmental conditions. The grey polymer housing offers excellent pollution resistance and durability.
Drawings:
Technical Parameters：
Rated voltage: | 33kv |
Norminal discharge current: | 10kA |
Maximum continuous operating voltage (MCOV): | 27.5kv |
1/4µs steep current residual voltage: | 112kv |
8/20µs lightning current residual voltage : | 99kv |
30/60µs switching current residual voltage: | 86.7kv |
2000µs rectangular wave current impulse: | 250A |
4/10µs high current withstand discharge capacity : | 100KA |
Discharge classic: | 1 |
Creepage distance: | 1080mm |
Product Construction:
This High Voltage Surge Arrester's construction is a marvel of electrical engineering, optimized for performance and safety:
Metal-Oxide Varistor (MOV) Block: The core component is a sealed column of series-connected Zinc Oxide (ZnO) varistor discs. These discs possess highly non-linear characteristics, acting as an insulator under normal system voltage (33kV) and becoming a conductor almost instantaneously during an overvoltage event.
Polymer Housing: The ZnO block assembly is hermetically sealed within a grey, hydrophobic polymer housing. This housing is molded with a specific shed profile—in this case, a 26-shed design featuring alternating large and small sheds. This design is not merely aesthetic; it is functional.
Metallic Terminals: The unit is capped with a metallic top terminal (with a stud) for connection to the high-voltage line. The bottom terminal is equipped with a copper down-conductor, which provides the connection path for the discharged surge current to the grounding system.
Internal Sealing: Advanced sealing techniques prevent moisture ingress, which is crucial for maintaining long-term dielectric strength and operational stability.
Key Features & Advantages:
High Energy Handling: A Nominal Discharge Current of 10kA signifies its ability to safely handle severe lightning and switching surges, making it suitable for areas with high isokeranic levels.
Superior Insulation Performance: The 1080mm creepage distance, achieved by the optimized shed design, is essential for preventing surface flashovers across the insulator in polluted, coastal, or high-humidity environments. The alternating large and small sheds effectively disrupt the contamination path.
Excellent Protective Characteristics: The Zinc Oxide varistor core offers a very steep voltage-current response, providing a consistent and low protective level (often referred to as residual voltage), ensuring connected equipment like transformers and switchgear are effectively shielded.
Durable and Lightweight Housing: Compared to traditional porcelain, the polymer housing is highly resistant to impact, vandalism, and cracking. It is also significantly lighter, simplifying installation and reducing structural support requirements.
Maintenance-Free Operation: As a sealed unit with no gaps, the arrester requires minimal to no maintenance throughout its service life.
Production Process :
The manufacturing of this arrester involves precise and controlled stages:
1.Varistor Disc Production: High-purity Zinc Oxide powder is mixed with other metal oxides, pressed into disc shapes, and sintered at high temperatures to form the semiconducting ceramic blocks with non-linear properties.
2.Electrical Grading and Stacking: Each varistor disc is electrically tested and graded. Discs with matching characteristics are then stacked in series to achieve the required voltage rating.
3.Housing Molding and Assembly: The polymer housing is injection-molded over the varistor column or the column is placed into a pre-molded housing. The housing's shed profile is created during this molding process.
4.Encapsulation and Sealing: The assembly is hermetically sealed using high-grade compounds and techniques to create a moisture-proof barrier, protecting the internal components from the environment.
5.Terminal Attachment and Final Testing: Metallic terminals are fitted to both ends. Each individual arrester undergoes rigorous final testing, including power frequency withstand tests, residual voltage tests at 10kA, partial discharge measurement, and insulation resistance verification.
Application Scenarios:
This 33kV Surge Arrester is deployed across a wide range of medium-voltage applications to protect critical infrastructure:
Electrical Substations: Installed at the incoming lines to protect power transformers, circuit breakers, and busbars from incoming surges.
Industrial Plants: Used to shield motors, capacitor banks, and factory switchgear from damaging overvoltages that can cause costly downtime.
Renewable Energy Facilities: Essential for protecting step-up transformers and switchgear in solar farms and wind power installations, which are often exposed to lightning.
Power Distribution Networks: Mounted on poles or in switch cabinets to protect distribution transformers and cables along overhead lines and underground networks.
Commercial and Large Building Systems: Applied where medium-voltage power is distributed within a facility.
Company Tour:
 |  |
 |  |
 |  |  |
Product Introduction:
Detailed Product Name: 33kV Polymer Surge Arrester
This document provides a comprehensive overview of the 33kV Metal Oxide Surge Arrester (MOA), a critical component designed for overvoltage protection in medium-voltage power systems.
This Composite Surge Arrester is an advanced electrical device engineered to safeguard valuable equipment in power distribution networks by diverting dangerous voltage transients, such as those caused by lightning strikes or switching operations, safely to the ground. Its robust design, highlighted by a 16-shed profile and a substantial 1080mm creepage distance, ensures high reliability even in demanding environmental conditions. The grey polymer housing offers excellent pollution resistance and durability.
Drawings:
Technical Parameters：
Rated voltage: | 33kv |
Norminal discharge current: | 10kA |
Maximum continuous operating voltage (MCOV): | 27.5kv |
1/4µs steep current residual voltage: | 112kv |
8/20µs lightning current residual voltage : | 99kv |
30/60µs switching current residual voltage: | 86.7kv |
2000µs rectangular wave current impulse: | 250A |
4/10µs high current withstand discharge capacity : | 100KA |
Discharge classic: | 1 |
Creepage distance: | 1080mm |
Product Construction:
This High Voltage Surge Arrester's construction is a marvel of electrical engineering, optimized for performance and safety:
Metal-Oxide Varistor (MOV) Block: The core component is a sealed column of series-connected Zinc Oxide (ZnO) varistor discs. These discs possess highly non-linear characteristics, acting as an insulator under normal system voltage (33kV) and becoming a conductor almost instantaneously during an overvoltage event.
Polymer Housing: The ZnO block assembly is hermetically sealed within a grey, hydrophobic polymer housing. This housing is molded with a specific shed profile—in this case, a 26-shed design featuring alternating large and small sheds. This design is not merely aesthetic; it is functional.
Metallic Terminals: The unit is capped with a metallic top terminal (with a stud) for connection to the high-voltage line. The bottom terminal is equipped with a copper down-conductor, which provides the connection path for the discharged surge current to the grounding system.
Internal Sealing: Advanced sealing techniques prevent moisture ingress, which is crucial for maintaining long-term dielectric strength and operational stability.
Key Features & Advantages:
High Energy Handling: A Nominal Discharge Current of 10kA signifies its ability to safely handle severe lightning and switching surges, making it suitable for areas with high isokeranic levels.
Superior Insulation Performance: The 1080mm creepage distance, achieved by the optimized shed design, is essential for preventing surface flashovers across the insulator in polluted, coastal, or high-humidity environments. The alternating large and small sheds effectively disrupt the contamination path.
Excellent Protective Characteristics: The Zinc Oxide varistor core offers a very steep voltage-current response, providing a consistent and low protective level (often referred to as residual voltage), ensuring connected equipment like transformers and switchgear are effectively shielded.
Durable and Lightweight Housing: Compared to traditional porcelain, the polymer housing is highly resistant to impact, vandalism, and cracking. It is also significantly lighter, simplifying installation and reducing structural support requirements.
Maintenance-Free Operation: As a sealed unit with no gaps, the arrester requires minimal to no maintenance throughout its service life.
Production Process :
The manufacturing of this arrester involves precise and controlled stages:
1.Varistor Disc Production: High-purity Zinc Oxide powder is mixed with other metal oxides, pressed into disc shapes, and sintered at high temperatures to form the semiconducting ceramic blocks with non-linear properties.
2.Electrical Grading and Stacking: Each varistor disc is electrically tested and graded. Discs with matching characteristics are then stacked in series to achieve the required voltage rating.
3.Housing Molding and Assembly: The polymer housing is injection-molded over the varistor column or the column is placed into a pre-molded housing. The housing's shed profile is created during this molding process.
4.Encapsulation and Sealing: The assembly is hermetically sealed using high-grade compounds and techniques to create a moisture-proof barrier, protecting the internal components from the environment.
5.Terminal Attachment and Final Testing: Metallic terminals are fitted to both ends. Each individual arrester undergoes rigorous final testing, including power frequency withstand tests, residual voltage tests at 10kA, partial discharge measurement, and insulation resistance verification.
Application Scenarios:
This 33kV Surge Arrester is deployed across a wide range of medium-voltage applications to protect critical infrastructure:
Electrical Substations: Installed at the incoming lines to protect power transformers, circuit breakers, and busbars from incoming surges.
Industrial Plants: Used to shield motors, capacitor banks, and factory switchgear from damaging overvoltages that can cause costly downtime.
Renewable Energy Facilities: Essential for protecting step-up transformers and switchgear in solar farms and wind power installations, which are often exposed to lightning.
Power Distribution Networks: Mounted on poles or in switch cabinets to protect distribution transformers and cables along overhead lines and underground networks.
Commercial and Large Building Systems: Applied where medium-voltage power is distributed within a facility.
Company Tour:
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