YH5WZ-51/134Q Gapless Zinc Oxide Surge Arrester for 10–220kV
The YH5WZ-51/134Q Gapless Zinc Oxide Surge Arrester is designed to provide reliable overvoltage protection for 10–220kV transmission, substation, and power distribution systems. It uses high-performance zinc oxide (ZnO) varistor elements and a composite silicone rubber housing to respond quickly to lightning and switching surges. With strong environmental resistance and a compact, lightweight construction, it is well suited for outdoor high-voltage applications, including transmission lines, substations, industrial facilities, and renewable energy installations.
Get a QuoteOverview
The YH5WZ-51/134Q Gapless Zinc Oxide Surge Arrester is a high-voltage metal oxide arrester designed for overvoltage protection in transmission and substation systems from 10kV to 220kV. Based on high-performance zinc oxide (ZnO) varistor technology, it provides a rapid response to lightning and switching surges, helping limit transient overvoltages and protect transformers, switchgear, transmission lines, and other critical electrical equipment.
The arrester uses a composite silicone rubber housing that provides reliable insulation and resistance to outdoor environmental conditions. With a discharge current capability of up to 12kA (8/20μs), it is suitable for applications requiring effective surge-energy handling and stable long-term operation. Its compact and lightweight construction also facilitates installation and maintenance.
Designed for demanding outdoor environments, the YH5WZ-51/134Q can operate across a temperature range of -45°C to +75°C and offers strong resistance to pollution, salt fog, and chemical corrosion. The arrester is manufactured according to applicable GB 11032 and JB/T 10497 requirements, making it suitable for high-voltage transmission, substation, and power distribution applications.
Material and Structural Design
- High-Performance ZnO Varistor Elements:
The arrester uses optimized zinc oxide varistor elements to provide stable nonlinear voltage characteristics, low leakage current, and strong resistance to surge stress. The improved material formulation also helps slow electrical aging and maintain reliable protective performance over an extended service life. - Composite Silicone Rubber Housing:
The reinforced silicone rubber housing is produced using an integrated molding process to provide a sealed, gap-free structure. This construction helps prevent moisture ingress and contamination while improving resistance to outdoor environmental conditions, supporting safe and stable operation in demanding applications. - Compact and Lightweight Construction:
The optimized structure reduces overall size and weight while maintaining mechanical strength and impact resistance. This makes the arrester easier to transport and install, helping reduce installation time and labor requirements for high-voltage outdoor applications.
Technical Data
| Item | Specific Index | Description | |
| Lightning Discharge Capacity | 12kA, 8/20μs | Absorbs and releases lightning overvoltage energy rapidly | |
| Lightning Trip Reduction | ≥70% | Significantly enhances grid reliability | |
| ZnO Varistor Performance | Low leakage, slow aging | Extends service life | |
| Above-Standard Capability | Exceeds GB standards for DC reference voltage and current tolerance | High overload endurance | |
Standards and Quality Assurance
Industry Standards
The YH5WZ-51/134Q Gapless Zinc Oxide Surge Arrester is designed and manufactured in accordance with applicable standards for metal oxide surge arresters used in high-voltage power systems. Its technical requirements include:
- GB 11032-2000 — AC Gapless Metal Oxide Surge Arresters, corresponding to the technical requirements of IEC 60099-4.
- JB/T 10497-2005 — Composite-Sheath Metal Oxide Arresters for AC Power Systems.
These standards cover key aspects such as electrical performance, insulation characteristics, surge-current withstand capability, and operational reliability.
Quality Control and Testing
Manufacturing is carried out under an ISO 9001-certified quality management system, with electrical and mechanical performance checked at multiple stages of production. Typical quality-control procedures include:
- ZnO Varistor Testing: Inspection of appearance and electrical characteristics, including DC reference voltage (U1mA), residual voltage at specified discharge current, and square-wave current performance.
- Routine Factory Testing: Sealing performance, DC reference voltage, leakage current at 0.75U1mA, power-frequency withstand voltage, continuous operating current, and partial discharge.
- Sampling Tests: Accelerated aging, high-current impulse withstand testing at 4/10μs, and 2ms square-wave current capability testing.
These inspection procedures help verify the arrester’s electrical characteristics, sealing integrity, and ability to withstand repeated transient surge conditions before shipment.
Core Application Scenarios
Heavy Industrial Environments
With strong resistance to external pollution and chemical corrosion, the YH5WZ-51/134Q is suitable for industrial areas such as petrochemical plants, metallurgical facilities, and manufacturing sites. It helps reduce the effects of contamination and transient overvoltage on outdoor insulation systems.
Wind and Solar Power Facilities
The arrester can be used in wind farms, photovoltaic power plants, and renewable-energy collection networks to provide protection against lightning and switching surges. Its compact composite construction is particularly suitable for outdoor power-generation installations where reliable insulation and limited maintenance are required.
Existing Grid Modernization
The compact and lightweight design allows the arrester to be integrated into existing transmission and distribution structures with relatively limited modification. It can be used for aging-grid upgrades and equipment replacement projects, helping simplify installation while reducing the need for extensive structural reconstruction.
