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ZW32-12 0utdoor HV Vacuum Circuit Breaker
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S11 Series 10KV Distribution Transformer
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ZN85-40.5 Indoor HV Vacuum Circuit breaker
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S10 Series 10KV Distribution Transformer
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Single-phase Oil Immersed Transformer
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ZW8-12,ZW8-12G Hv Vacuum Circuit Breaker
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VS1(ZN63) H.V Vacuum Circuit Breaker
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SC(ZB)10 Series 10KV Dry Transformer
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VS1-12 Type Side-Mounted(Vbm7) Vacuum Circuit Breaker
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Comprehensive Portfolio
A full spectrum of high voltage solutions to meet diverse industry needs, from grid infrastructure to industrial power systems.
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Proven Safety & Reliability
Designed and tested to meet international standards, ensuring safe operation, reduced downtime, and long service life.
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Tailored Engineering Solutions
Fit-for-purpose product designs that adapt to customer requirements across power, transmission, distribution, and renewables.
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Efficient Project Delivery
From conceptual design to commissioning, YIFA products are supported by a skilled team of industry specialists to guarantee quality and on-time completion.
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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. -
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. -
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.
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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. -
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. -
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. -
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. -
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. -
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*). -
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).
