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15KV Polymer Surge Arrester

This is a 15kV Silicone Surge Arrester, a critical component designed to protect medium-voltage electrical equipment from damaging transient overvoltages.
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Product Introduction:

This is a 15kV Silicone Surge Arrester, a critical component designed to protect medium-voltage electrical equipment from damaging transient overvoltages. These overvoltages, often caused by lightning strikes on power lines or switching operations within the grid, can lead to equipment failure and power outages. The arrester safeguards the system by providing a high-resistance path under normal operating conditions. However, when a dangerous voltage surge occurs, it instantly becomes a low-resistance path, safely channeling the excessive electrical energy to the ground. This specific model is distinguished by its robust construction featuring gray silicone rubber housing with a 7-umbrella shed design, optimized for reliability in polluted and harsh environments.

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Technical Parameters:

Rated voltage:

15kv

Norminal discharge current:

10kA

Maximum continuous operating voltage (MCOV):

12.7kv

1/4µs steep current residual voltage:

51.0kv

8/20µs lightning current residual voltage :  

45kv

30/60µs switching current residual voltage:

38.5kv

2000µs rectangular wave current impulse:

250A

4/10µs high current withstand discharge capacity :

100KA

Discharge classic:

1

Creepage distance:

480mm


Product Construction:

The composite surge arrester's construction is engineered for durability and performance:

Metal-Oxide Varistor (MOV) Core: The heart of the arrester is a zinc oxide (MOV) block. This ceramic material has a non-linear resistance characteristic, which allows it to act as an insulator at normal voltages and become a conductor at surge voltages.

Silicone Rubber Housing: The MOV core is permanently encapsulated within a series of gray silicone rubber discs. These discs are molded and vulcanized together to form a single, seamless, hydrophobic housing. The specific “7-umbrella” design is not just for structure; it is a key performance feature.

Metal End Fittings: The assembly is terminated with high-strength metal terminals at both ends. The top stud is for connection to the live conductor, while the bottom terminal includes an attachment point for a braided copper grounding wire, ensuring a secure path to earth.

Mounting Bracket: An integrated gray polymer mounting bracket allows for secure and easy installation on cross-arms or structures.

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Key Features & Specifications:

Rated Voltage: 15 kV

Nominal Discharge Current:10 kA. This is the peak value of a current wave that the arrester is capable of discharging repeatedly.

High Current Withstand & Discharge Capacity: 100 kA. This indicates a very high ability to withstand and divert extreme surge currents, such as those from a direct lightning strike, without failure.

Creepage Distance: 480 mm. This long leakage distance over the insulator surface is crucial for preventing flashovers in areas with high pollution, salt, dust, or moisture, ensuring stable performance.

Superior Material Properties:

- Excellent Hydrophobicity: The silicone rubber surface repels water, preventing the formation of a continuous conductive film.

- Pollution & UV Resistance: The material is highly resistant to tracking, erosion, and degradation caused by environmental factors.

-Self-Cleaning: The smooth, hydrophobic surface aids in the washing away of contaminants by rain.

7-Umbrella Shed Design: This design maximizes the creepage distance and disrupts the path of water, enhancing the arrester's performance in wet and contaminated conditions by preventing bridging between sheds.

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Production Process:

The manufacturing process ensures high quality and reliability:

MOV Core Production: The zinc oxide varistor blocks are precision-manufactured and sintered to achieve their specific non-linear electrical characteristics.

Silicone Rubber Compounding: High-purity silicone rubber is mixed with additives (like ATH - Alumina Trihydrate) to enhance tracking and erosion resistance.

Molding and Vulcanization: The MOV core is placed in a mold, and the silicone rubber compound is injected or compression-molded around it under heat and pressure. This process forms the distinctive 7-umbrella shed shape and chemically bonds the rubber to the core and end fittings, creating a hermetic seal.

Curing: The unit is cured to cross-link the polymer chains, giving the silicone its final elastic and dielectric properties.

Machining and Assembly: Metal end fittings are machined to precise tolerances and assembled.

Rigorous Testing: Each unit undergoes a series of electrical tests (e.g., power frequency withstand voltage, residual voltage, leakage current measurement) to ensure it meets all specified performance criteria.

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Primary Applications:

This 15KV surge arrester (also named Oxide Zinc Surge Arrester) is widely used in outdoor medium-voltage (15kV) distribution networks to protect critical assets, including:

Power Transformers (both primary and secondary sides)

Switchgear and circuit breakers

Capacitor Banks

Rotating Machines (e.g., large motors)

Other sensitive electrical and electronic equipment connected to the grid.

Its robust construction and long creepage distance make it particularly suitable for installation in coastal areas, industrial zones, and other environments with high levels of air pollution, salt fog, or dust.


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