Mga Detalyadong Solusyon para sa Karaniwang mga Problema sa SF6 Ring Main Units (RMUs)
Mahinog nga mga Solusyon alang sa Karaniwang Problema sa SF6 Ring Main Units (RMUs)
Ang matumong operasyon sa high-voltage SF6 RMUs mahalaga kaayo sa seguridad sa grid. Tungod sa pagtubag sa tipikal nga problema nga gitawag karon sa dugay nga panahon sa operasyon, ug batas sa industriya ug teknikal nga pamaagi, ang sumusunod nga sistemang solusyon gipanghangyo:
I. Komprehensibong Plano sa Pamamahala sa Pagdumop sa Gas
- Phenomenon & Risk:
- Ang pagdumop sa gas sa SF6 mababa ang dielectric strength (ang breakdown voltage mababa ngadto sa higit pa 30% kon ang presyon mababa sa 0.4MPa).
- Ang mga produkto sa decomposition sa ark (e.g., SF4, SOF2) nagpapailubon sa seguridad sa mga tawo.
- Proactive Defense System:
|
Kontra-hakot |
Pamantaran |
Bilis / Pamaagi |
|
Laser Imaging Leak Detection |
DL/T 1145 |
Annual census + Special inspections after rain |
|
Dual-Channel Density Relay Monitoring |
IEC 62271 |
Real-time alarm threshold setting (0.55MPa at 20°C) |
|
Complete Sealing Component Retrofit |
GB/T 11023 |
Use fluororubber O-rings + metal bellows seals |
|
Emergency Response Drills |
Q/GDW 1799.2 |
Quarterly drills (including positive pressure breathing apparatus operation) |
II. Strategiya para sa Pagwagtaw sa Mga Pagkakamali sa Mechanical Operation
- Mga Mechanism sa Pagkakamali:
- Mechanism sticking/jamming (80% caused by lubricant hardening).
- Micro-switch failure.
- Operation refusal/maloperation caused by secondary wiring oxidation.
- Precision Maintenance Plan:
- Semi-Annual Maintenance: Encompasses two critical tasks: 1) Disassembly and refurbishment of the operating mechanism; 2) Coil resistance testing. These tasks enable timely assessment of the equipment's fundamental condition.
- Intelligent Monitoring: Focuses on in-depth analysis of operational status, specifically including: 1) Analysis of open/close coil current waveforms; 2) Assessment of the energy storage motor status. This achieves precise control over equipment operation.
- Preventive Testing: Utilizes specialized instruments to ensure test accuracy, employing mechanical characteristic testers and micro-ohm meters for contact resistance testing. This provides robust data support for safe and stable operation.
III. Pagpanalipod ug Pagkontrol sa Insulation Degradation ug Overheating
- Comprehensive Protective Measures:
- Insulation Refurbishment:
- Apply moisture-proof RTV coating to epoxy barrel surfaces (withstands 40% higher voltage).
- Replace porcelain bushings with silicone rubber bushings (impact resistance strength increased by 3 times).
- Thermal Management Upgrade:
Heat Dissipation Power = 6.5×10⁻³×(T_cabinet - 25)³ // Optimization Measures:
- Install IP55 centrifugal fans at the cabinet top (ΔT reduced by 8℃).
- Silver plating treatment of copper busbars (contact resistance reduced by 35%).
- Embed heat pipe radiators into the contact assemblies.
IV. Pagtatukod sa Intelligent Operation & Maintenance (O&M) System
|
Technology Module |
Function Implementation |
Benefit |
|
UHF Partial Discharge (PD) Monitoring |
Captures 300MHz-1.5GHz signals |
Provides 3-month early warning for insulation defects |
|
Pressure Cloud Map Analysis |
Leakage prediction based on temperature compensation |
Increases leak location efficiency by 70%+ |
|
Mechanical Life Assessment |
Stress analysis based on cumulative switching operations |
Achieves >90% mechanism failure prediction rate |
Validation via Typical Case
Matapos ang implementasyon niining solusyon sa usa ka State Grid 220kV substation:
▶ Annual SF6 leakage rate dropped from 0.8% to 0.05%.
▶ Number of mechanical failures decreased by 82% (from 2021 to 2023).
▶ Peak temperature rise reduced from 75K to 48K (IEC 60298).
Key O&M Implementation Points
- Establish a full life-cycle equipment database (including spare parts life warnings).
- Promote live detection techniques to replace scheduled outage testing.
- Deepen the application of Condition-Based Maintenance (CBM) decision systems.
