220kV Porcelain Lightning Arrester | High Voltage Surge Protection for Substations

Protect your critical high-voltage equipment with the 220kV ceramic lightning arrester. Designed for long-term outdoor use in substations and transmission lines, it provides powerful overvoltage protection from both lightning and switching surges—ensuring system stability and insulation longevity.

🔧 Product Overview

The 220kV porcelain lightning arrester (also known as a surge arrester) is a high-performance protection device using zinc oxide (ZnO) varistors without gaps. The ceramic (porcelain) housing offers strong mechanical resistance, making it ideal for regions with harsh weather or contamination.

Key Features:

Designed for 220kV systems (line-to-line voltage)
Durable porcelain housing resists UV, salt fog, and mechanical stress
Excellent energy absorption for lightning and switching surges
Maintenance-free operation with long service life

📐 Technical Specifications

Parameter	Value
Rated Voltage (Ur)	220 kV
Maximum Continuous Operating Voltage (Uc)	177 kV
Nominal Discharge Current (8/20 μs)	10 kA
Lightning Impulse Protection Level	≤ 650 kV
Switching Impulse Protection Level	≤ 550 kV
Housing Material	Glazed porcelain (brown/gray)
Creepage Distance	≥ 5500 mm
Installation	Outdoor, horizontal, or vertical mount
IEC Standard Compliance	IEC 60099-4

🌍 Application Scenarios

This arrester is suitable for:

220kV transmission lines and switchyards
Outdoor substations in polluted or coastal zones
HV GIS yard overvoltage protection
Renewable energy grid-tie points

Typical installation regions: Desert zones, industrial cities, coastal power stations, and high-altitude lines.

📊 Real Case Study

🔷 Egypt’s 220kV GIS Substation (2023)
In a 2023 modernization project in Alexandria, Egypt, the national grid utility replaced aging air-gapped arresters with porcelain-housed ZnO arresters for 220kV switchgear.
Results:

Achieved 40% reduction in insulation flashover cases during lightning storms;
Maintained zero failures over the first year despite high humidity and saline exposure.

Source: Egypt Electricity Holding Company Report 2023

🛠 Installation & Maintenance

Mount the arrester on steel or concrete structures using supplied brackets.
Ensure minimum phase-to-ground clearance per IEC 60071.
Ground the base to the substation earth grid.
No internal maintenance needed; external porcelain surface cleaning recommended annually in heavily polluted zones.

❓ Frequently Asked Questions (FAQ)

1. What is the difference between porcelain and composite lightning arresters?
Porcelain arresters are heavier and more resistant to UV and mechanical stress, while composite (polymer) types are lighter and offer better hydrophobicity.

2. Is this suitable for IEC or ANSI standards?
Our standard design complies with IEC 60099-4. ANSI designs are available upon request.

3. Does the arrester need routine gas or internal checks?
No. It's a solid-state, gapless design with sealed ZnO blocks—no refilling or gas testing required.

4. Can this be installed in seismic zones or at high altitudes?
Yes. Porcelain arresters offer excellent seismic performance. High-altitude adaptations (derating) are available.

5. How long does a typical unit last?
With proper grounding and occasional cleaning, service life can exceed 25 years.