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Safety and Protection
Low-voltage circuit breakers offer automatic disconnection in case of overload or short circuits, preventing damage and fires.
All three components contribute to a safer electrical environment, protecting both property and individuals. -
Reliability and Stability
Integrated protection functions in circuit breakers, such as leakage and overvoltage protection, enhance the reliability of electrical systems.
Surge protectors improve the stability of critical equipment and systems by reducing the impact of voltage fluctuations. -
Efficiency and Energy Conservation
Prompt disconnection of overloaded circuits by circuit breakers helps in saving energy and reducing waste.
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Maintenance and Cost Reduction
The ease of maintenance of low-voltage circuit breakers reduces service costs and downtime.
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Common Issues in High Voltage Products & Solutions
Q: What are the signs and causes of insulation aging/breakdown in high-voltage equipment?
Signs: Increased leakage current, localized overheating, abnormal discharge sounds.
Causes:
Long-term electrical stress degrading materials.
Environmental factors (humidity, pollutants like salt/dust).
Overvoltage surges (lightning, switching operations).
Solutions:
Perform regular dielectric loss testing (tanδ) and partial discharge detection.
Upgrade to weather-resistant insulation materials (silicone rubber, epoxy resin).
Install surge arresters and overvoltage protection devices.
Q: How to address corona discharge in high-voltage conductors?
Signs: Visible blue-purple glow, ozone odor.
Causes: Sharp edges/small curvature radii causing electric field concentration.
Solutions:
Optimize grading ring design for uniform electric field distribution.
Apply anti-corona coatings (e.g., semi-conductive paint).
Clean conductor surfaces regularly to remove contaminants.
Q: Why do circuit breaker switching mechanisms jam, and how to fix this?
Signs: Delayed opening/closing, abnormal vibrations.
Causes:
Aged lubricant or contamination ingress.
Component wear (spring fatigue, gear deformation).
Solutions:
Use fully sealed designs to block dust.
Conduct mechanical characteristic tests every 3 years (operation timing, bounce time).
Replace parts with self-lubricating bearings or ceramic-coated components.
Q: How to prevent sealing failures in SF6 gas/oil-immersed equipment?
Signs: SF6 gas leakage, oil leakage in oil-immersed equipment.
Causes:
Degraded seals (temperature cycling causing rubber cracks).
Uneven flange installation stress.
Solutions:
Adopt dual-seal designs with leakage monitoring sensors.
Replace rubber seals with metal bellows for critical joints.
Monitor gas pressure/oil levels routinely.
Q: What causes overheating at electrical contact points?
Signs: Infrared shows contact temperatures >80°C.
Causes:
Increased contact resistance (oxidation, loosening).
Overloading beyond rated current.
Solutions:
Use silver-plated contacts to reduce resistance.
Install wireless temperature sensors (e.g., CT-powered modules).
Implement forced-air or water cooling.
Q: How to resolve poor heat dissipation in transformers?
Signs: Oil temperature >95°C in oil-immersed transformers.
Causes: Clogged radiators, fan failures, or inadequate ventilation.
Solutions:
Clean annually; upgrade to variable-frequency smart fans.
Add heat pipe systems or auxiliary air conditioning.
Q: How to prevent condensation/icing in high-voltage enclosures?
Signs: Water droplets on inner walls, reduced insulation performance.
Solutions:
Install auto-heating/dehumidification systems.
Use aerogel insulation to block external cold sources.
Design enclosures with sloped tops to prevent water accumulation.
Q: How to mitigate corrosion and pollution flashovers?
Signs: Rust on metal parts, pollution-induced flashovers on insulators.
Solutions:
Use 316L stainless steel or aluminum alloy coatings in coastal areas.
Apply RTV silicone coatings (hydrophobic surfaces).
Perform live-line washing periodically.
Q: What technologies enable predictive maintenance for high-voltage systems?
Solutions:
Deploy multi-sensor monitoring (DGA for oil analysis, high-frequency partial discharge detection, vibration sensors).
Use AI models trained on historical data to predict failures 2–3 months in advance.
Follow standardized protocols (e.g., *DL/T 596 Power Equipment Preventive Test Code*).
Case Study Example
Q: A 500kV GIS reports frequent partial discharge alarms. How to diagnose and resolve this?
Diagnosis: Ultrasound testing locates surface burrs on disconnector contacts.
Solution: Polish contacts during outage, apply conductive grease. Post-repair discharge levels drop to <5pC (meets national standard <20pC).
