Comprehensive Analysis of Surge Arrester Failure Causes & Practical Guide to Extend Service Life

Surge arresters are critical components designed to protect electrical

equipment from overvoltage and lightning strikes. In practical

applications, various factors can lead to performance degradation or

damage. Understanding these causes and implementing targeted protective

measures is essential for extending service life and ensuring electrical system safety. Below is a systematic analysis of primary failure causes

and mitigation strategies:

1. Lightning Strike Factors

Excessive Strikes: Lightning currents exceeding the arrester’s

design capacity (in magnitude or frequency) cause direct damage.

Mitigation: Select arresters matching local lightning activity intensity/frequency; regularly evaluate condition and replace when necessary.

Cumulative Effect: Energy accumulation from multiple minor strikes

gradually degrades performance.

Mitigation: Implement multi-stage lightning protection to distribute energy discharge and reduce single-stage burden.

2. Power System Overvoltage

Grid Fluctuations: Voltage transients or harmonic disturbances

impose additional stress, accelerating aging/damage.

Mitigation: Install voltage stabilizers and harmonic filters.

Switching Overvoltage: Transient overvoltage from operations like

motor startups or heavy load switching.

Mitigation: Use soft starters or VFDs for controlled equipment activation/deactivation.

3. Product Quality Issues

Material Defects: Substandard/counterfeit products prone to failure

under normal conditions.

Mitigation: Source from reputable brands/suppliers; verify

compliance certifications.

Poor Craftsmanship: Manufacturing flaws (e.g., weak soldering,

inadequate sealing) compromise performance/longevity.

Mitigation: Enforce strict pre-procurement quality inspections.

4. Installation & Grounding Errors

Inadequate Grounding: Ground resistance >4Ω impedes lightning current dissipation, causing damage.

Mitigation: Ensure compliant grounding systems; maintain resistance below 4Ω through regular testing.

Unsuitable Location: High temperature, humidity, or vibration

environments accelerate failure.

Mitigation: Install in environmentally stable locations.

Wiring Mistakes: Incorrect connections (especially grounding) prevent proper operation.

Mitigation: Follow manufacturer guidelines; use certified

technicians for installation.

5. Environmental Influences

Temperature Extremes: Thermal stress destabilizes internal components.

Mitigation: Select temperature-rated models; implement climate control where needed.

Humidity/Corrosion: Moisture/corrosive gases erode internals and

degrade insulation.

Mitigation: Use corrosion-resistant/humidity-proof arresters; enhance environmental management.

Contaminant Buildup: Dust/dirt accumulation impairs heat dissipation

and electrical performance.

Mitigation: Perform regular cleaning maintenance.

6. Natural Aging

Component Degradation: Critical elements (e.g., MOVs) lose

effectiveness over time.

Mitigation: Schedule periodic inspections and proactive

replacements.

Enclosure Deterioration: UV exposure/weathering causes casing cracking/degradation.

Mitigation: Choose UV-resistant materials; apply protective measures.

7. Related Electrical Faults

Short Circuits: High current/temperature events directly destroy

arresters.

Mitigation: Install fuses/circuit breakers for fault isolation.

Adjacent Equipment Failures: Transformer/cable faults induce

overvoltage/short circuits.

Mitigation: Conduct systematic equipment maintenance to preempt failures.

Key Strategies to Extend Service Life:

Product Selection: Choose high-quality arresters based on protection level and environmental

requirements.

Compliant Installation: Ensure proper mounting and verified low-resistance grounding.

Scheduled Maintenance: Implement routine inspections and corrective

actions.

Environmental Control: Minimize exposure to extreme conditions and

contaminants.

Conclusion: Surge arrester failures result from multifaceted factors

including lightning strikes, grid anomalies, product defects,

installation errors, environmental stress, aging, and electrical faults. Adopting these integrated protection strategies significantly reduces

failure risks and ensures long-term electrical system reliability.