Question 1

What are the common faults in dense busways (busbar trunking systems)?

Accepted Answer

Dense busways can experience four main categories of faults: 1) Insulation performance degradation caused by material aging, thermal stress accumulation, and partial discharge; 2) Conductor connection deterioration due to joint loosening, contact surface oxidation, and electromagnetic force effects; 3) External environment and mechanical stress impacts including environmental corrosion, overload operation, and mechanical damage; 4) Manufacturing and installation issues such as manufacturing defects and improper installation practices.

Question 2

Why use distributed fiber optic temperature sensing (DTS) for power cables?

Accepted Answer

DTS provides full-line dead-zone-free temperature monitoring, precise hotspot localization, electromagnetic interference immunity, long-distance maintenance-free operation, and early warning for fire or insulation breakdown. Over 80% of cable failures are temperature-related and most start as invisible local hotspots that point sensors cannot detect.

Question 3

Why do high/medium voltage distribution equipment need arc energy absorbing base?

Accepted Answer

Internal short-circuit arcs in 10–35kV switchgear reach 15,000–20,000°C, generate pressures of tens to hundreds of kPa in milliseconds, and release MJ-level energy. Traditional top-only pressure relief panels cannot withstand high-current arcs (≥20kA). The Arc Energy Absorbing Base absorbs peak pressure (50%–80% reduction), directionally vents hot gas away from personnel, blocks arc root penetration into cable trenches, and protects cable compartments and secondary circuits. Standards IEC 62271-200 and GB 3906 mandate pressure relief + energy absorption for internal arc protection.

Question 4

How to extend aging equipment life by 5 years with partial discharge without replacing components?

Accepted Answer

Aging equipment with partial discharge can extend service life by 5 years without component replacement under these preconditions: no penetrating cracks, no large-area carbonization, no metal melting, PD <500pC, no obvious developing trend, and normal oil/gas indicators. The three-pronged approach includes: 1) Power-off non-invasive repair: cleaning & drying, electric field equalization & shielding, insulation reinforcement (RTV coating, silicone rubber injection), and connection tightening; 2) Conservative operation: voltage reduction to 0.9-0.95 pu, load ≤70% rated, strict environmental control; 3) 24/7 online monitoring: UHF+ultrasonic+TEV triple PD monitoring, fiber optic temperature sensing, and oil/gas chromatography. Equipment with >1000pC PD or rapid escalation requires load reduction and replacement planning.

常见问题 Frequently Asked Questions

密集母线（母线槽）常见故障？ What Are the Common Faults in Dense Busways (Busbar Trunking Systems)?

为何电缆需要用分布式光纤测温？ Why Use Distributed Fiber Optic Temperature Sensing (DTS) for Power Cables?

为何高中压配电设备需要燃弧吸能底座？ Why Do High/Medium Voltage Distribution Equipment Need Arc Energy Absorbing Base?

应急处理局放问题，如何不换件让老旧设备再运行5年？ Emergency PD Treatment: Extend Aging Equipment Life 5 Years Without Replacement?