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21kV Composite Polymer Metal Oxide Surge Arrester Manufacturer
Factory: We are a professional manufacturer providing OEM custom production services.
- Product Overview
- Technical Specifications
- Product Structure
- Applications
- Testing Capability
- Packaging & Customization
Product Overview
The 21kV composite polymer metal oxide surge arrester is designed for overvoltage protection in medium-voltage distribution systems. Wishpower uses high-performance zinc oxide varistors and a silicone rubber polymer housing to provide reliable lightning protection, pollution resistance, lightweight installation and long-term outdoor service performance.
Compared with traditional porcelain-housed arresters, the composite polymer housed arrester offers better safety, lighter weight and easier installation.
High-performance zinc oxide varistors provide fast response and low residual voltage.
Silicone rubber housing offers excellent hydrophobicity and pollution resistance.
Lightweight structure simplifies transportation, installation and maintenance.
Gapless design supports stable operation in distribution networks.
Customized fittings and mounting accessories are available for different project requirements.
Core Features
Reliable overvoltage protection
The 21kV composite surge arrester effectively limits lightning overvoltage and switching overvoltage, reducing insulation failure risks in distribution equipment.High-quality zinc oxide varistors
The metal oxide varistor blocks current under normal operating voltage and conducts rapidly under surge conditions.Safe polymer housing
The silicone rubber composite housing provides high safety performance and avoids the explosion risk associated with porcelain housing.Excellent pollution resistance
The hydrophobic polymer surface helps reduce flashover risk in coastal areas, industrial zones, mountainous regions and rural distribution networks.Easy installation and maintenance
The arrester is compact and lightweight, suitable for pole-mounted installation, overhead lines, substations and cable terminal protection.Stable long-term operation
Reliable sealing design and weather-resistant materials support long outdoor service life.
Product Structure
Wishpower 21kV composite polymer metal oxide surge arrester generally consists of the following components:
Zinc oxide varistor blocks: the core protective element for surge current discharge and overvoltage limitation.
Silicone rubber polymer housing: provides external insulation, weather resistance and anti-pollution performance.
Fiberglass-reinforced structure or insulation support: improves mechanical strength and structural stability.
Upper and lower metal fittings: used for line connection, grounding and installation.
Sealing system: prevents moisture ingress and ensures long-term reliability.
Disconnector: optional accessory used to separate a failed arrester from the system for easier maintenance identification.
Technical Specifications
| Item | Technical Parameter |
|---|---|
| Product Name | 21kV Composite Polymer Metal Oxide Surge Arrester |
| Product Type | Polymer Housed Metal Oxide Surge Arrester |
| Rated Voltage | 21kV |
| Applicable System | Medium-Voltage Distribution System |
| Nominal Discharge Current | 5kA / 10kA, customizable |
| Structure Type | Gapless Zinc Oxide Surge Arrester |
| Housing Material | HTV Silicone Rubber / Composite Polymer Housing |
| Core Material | Zinc Oxide Varistor Blocks |
| Installation Environment | Indoor / Outdoor |
| Mounting Type | Line-mounted, pole-mounted, substation-mounted, cable terminal-mounted |
| Rated Frequency | 50Hz / 60Hz |
| Pollution Level | Designed according to project requirements |
| Creepage Distance | Customized according to standards or project specifications |
| End Fittings | Hot-dip galvanized steel or stainless steel |
| Standard | IEC 60099-4 or applicable project standard |
| Brand | Wishpower |
| Customization | Voltage rating, creepage distance, fittings and accessories available |
Product Structure
Main Applications
The 21kV composite polymer metal oxide surge arrester is widely used in:
Medium-voltage distribution line protection
Overhead line lightning protection
High-voltage side protection of distribution transformers
Substation incoming and outgoing feeder protection
Switchgear and ring main unit overvoltage protection
Cable terminal and cable branch box protection
Urban and rural distribution networks
Wind power and solar power distribution systems
Industrial parks, mining areas and polluted power supply environments
Testing Capability
Wishpower can perform relevant tests for 21kV composite polymer metal oxide surge arresters according to project requirements to ensure reliable operation in medium-voltage distribution systems.
Visual and dimensional inspection: checks product structure, markings, fittings and housing quality.
Power frequency reference voltage test: verifies electrical performance under specified current.
DC reference voltage test: checks the stability of zinc oxide varistor performance.
Leakage current test: evaluates insulation condition under operating voltage.
Residual voltage test: confirms the protection level under impulse current.
Partial discharge test: verifies internal insulation and sealing quality.
Sealing performance test: prevents moisture ingress and improves outdoor reliability.
Tensile or mechanical strength test: confirms fitting connection and structural strength.
Aging and weather resistance test: evaluates polymer housing performance under UV, humidity and polluted environments.
Packaging & Transportation
To keep products safe during transportation and storage, we use the following packaging methods:
- Individual Packaging: Each product is wrapped with protective film, packed in a high-strength carton, and cushioned with buffer materials.
- Pallet Packaging: Multiple products are fixed on wooden pallets and wrapped with stretch film, suitable for container shipping.
- Export Packaging: Fumigated wooden cases, moisture-proof treatment, and detailed packing lists are provided according to sea freight requirements.
Customization Service
WishPower can provide the following customization options according to customer requirements:
- Structural Dimensions: Adjust overall height, creepage distance, shed quantity, and shed diameter.
- End Fittings: Customize ball-socket, tongue-clevis, eye, or other interface types according to connection requirements.
- Color: Standard gray, with red, yellow, blue, and other colors available subject to MOQ.
- Special Environments: Formulations for extreme cold (-60 C), strong UV exposure, heavy pollution, and other harsh conditions.
- Voltage Classes: Full-range customization from 10kV to 1000kV.
- Marking: Customer logos or model numbers can be molded or printed on the product.
For specific customization requirements, please contact our sales engineers. We will provide a technical solution within 24 hours.
FAQ
Q: What standards can your products meet?
A: Our products can be designed and tested according to IEC, ANSI, GB and customer-specific technical requirements.
Q: How do I choose the right composite insulator for my project?
A: You can provide voltage level, installation type, mechanical load, creepage distance and operating environment. Our team will recommend the suitable model.
Q: Can you supply complete products for transmission and distribution projects?
A: Yes. We can provide composite insulators, surge arresters, fuse cutouts, insulating bushings and related power insulation products.
Q: Are composite insulators suitable for coastal areas?
A: Yes. Composite insulators with silicone rubber housing provide good hydrophobicity and anti-pollution performance, making them suitable for coastal and polluted environments.
Q: Can you provide customized insulation products?
A: Yes. WishPower supports customized voltage ratings, creepage distances, fittings, colors and drawings according to project requirements.
