YH5WZ-51/134 Station-Free Surge Arrester

The YH5WZ-51/134 Station-Free Surge Arrester is a gapless zinc oxide arrester designed for 10–220kV transmission and substation systems. Its base-free structure allows direct installation on suitable transmission towers or crossarms, simplifying installation and reducing supporting structure requirements. Equipped with ZnO varistors and a durable composite silicone rubber housing, it provides reliable protection against lightning and switching overvoltages while offering strong resistance to UV exposure, pollution, and harsh outdoor conditions.

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Description

Overview

The YH5WZ-51/134 Station-Free Surge Arrester is a gapless zinc oxide arrester designed for 10kV–220kV transmission lines and substations, providing protection against lightning and other transient overvoltages. Its station-free configuration removes the need for a conventional supporting base, allowing the arrester to be installed directly on suitable poles or tower structures. This compact arrangement can simplify field installation while helping reduce structural and labor requirements.

The arrester incorporates high-performance ZnO varistor elements within a durable composite silicone rubber housing. The nonlinear varistors respond rapidly to surge conditions and discharge lightning energy, while the composite housing provides reliable insulation and resistance to outdoor environmental exposure. With a 10kA, 8/20μs discharge capability, the YH5WZ-51/134 is suitable for high-voltage applications where dependable surge protection is required.

Designed for transmission and substation environments, the arrester combines compact construction with practical installation advantages. It is manufactured in accordance with GB 11032-2000 and JB/T 10497-2005, with GB 11032 corresponding to the technical requirements of IEC 60099-4 for AC gapless metal oxide surge arresters.

Operating Conditions

1. Ambient Temperature: -40°C to +70°C;

2. Salt Fog & UV Protection: Suitable for coastal and high-irradiance regions, resisting corrosion and aging;

3. Pollution Resistance: Rated for Class IV pollution, the highest level per IEC standards

Structural Design and Installation Advantages

Direct-Mount, Base-Free Construction:
The YH5WZ-51/134 adopts a station-free structure that eliminates the need for a separate foundation or conventional base assembly. It can be installed directly on suitable transmission-line crossarms or tower structures, helping simplify field installation, reduce supporting work, and shorten installation time.
Durable ZnO and Silicone Rubber Construction:
High-performance zinc oxide varistor elements form the electrical protection core, while the external composite silicone rubber housing provides insulation and mechanical protection. The housing is designed to withstand outdoor exposure, including moisture, UV radiation, pollution, and corrosive conditions.
Compact and Lightweight Configuration:
Compared with conventional arrester arrangements that require additional supporting structures, the base-free design reduces the overall installation footprint and equipment weight. This is particularly beneficial for transmission towers, elevated locations, and sites where transportation and manual handling are difficult.

Lightning and Overvoltage Protection

10kA Surge Discharge Capability:
The arrester is capable of handling 10kA (8/20μs) lightning discharge current, helping limit transient overvoltages and protect transmission lines, substations, transformers, and other high-voltage equipment.
Effective Lightning Surge Protection:
The nonlinear characteristics of ZnO varistors enable the arrester to respond rapidly when abnormal voltage occurs. By diverting surge energy to ground, it helps reduce insulation stress and the risk of lightning-related equipment interruptions.
Long-Term Outdoor Operation:
The composite housing and gapless ZnO construction are designed for reliable operation with minimal routine maintenance. This makes the YH5WZ-51/134 suitable for long-term installation on transmission towers and other outdoor high-voltage facilities.

Application Scenarios

Transmission Tower and Crossarm Installation

The YH5WZ-51/134 Station-Free Surge Arrester is designed for direct installation on suitable transmission towers, crossarms, and other supporting structures. Its base-free configuration is particularly useful for new line construction as well as existing transmission-line upgrades, where reducing structural modifications and installation work is important.

Industrial and High-Pollution Environments

With its extended creepage design and strong pollution resistance, the arrester is suitable for demanding environments such as chemical processing facilities, steel and metallurgical plants, and other heavy industrial areas. The composite silicone rubber housing helps maintain reliable insulation performance under contamination, moisture, UV exposure, and corrosive atmospheric conditions.

Mountainous Regions and Wind Power Projects

The compact and lightweight construction makes the YH5WZ-51/134 suitable for mountain transmission lines and wind farm electrical systems, particularly at locations where transportation and installation access are limited. Its robust mechanical construction supports reliable operation under wind, vibration, and other dynamic environmental loads.

Key Advantages

Base-free installation: Direct mounting helps simplify installation and reduce supporting structure requirements.
Lightweight construction: Reduced equipment weight makes transportation, handling, and tower installation easier.
Reliable lightning protection: 10kA (8/20μs) discharge capability helps protect high-voltage equipment from transient overvoltages.
Low-maintenance operation: Gapless ZnO technology and a sealed composite housing support long-term outdoor service.
Strong environmental resistance: Silicone rubber insulation provides good resistance to UV radiation, salt fog, moisture, and external pollution.
High-voltage system compatibility: Designed for 10kV–220kV transmission and substation applications and manufactured in accordance with applicable GB and IEC-related requirements.