
Background
Sa panahon ng pag-upgrade ng urban power grid, ang limitadong mga mapagkukunan ng lupa ay isang pangunahing hamon. Ang tradisyonal na kagamitang GIS ay okupado ng malaking vertical na espasyo dahil sa hiwalay na istraktura ng current transformers (CTs) at grounding switches, na naging botelya ng leche sa disenyo ng miniaturization ng substation.
Solusyon: Modular Integrated Design
Ang solusyong ito ay inobatibong nag-integrate nang malalim ang CT functionality sa operating mechanism ng grounding switch, na nagpapakamit ng muling paggamit ng espasyo at paglalampas sa performance:
- Space-Efficient Reuse:
- Embedded CT Coil: Inalis ang tradisyonal na standalone CT insulator, at direktang inembed ang high-precision measurement coils sa inner cavity structure ng insulated operating rod ng grounding switch.
- GIS Enclosure Magnetic Circuit Closure: Nakamit ang breakthrough na paggamit ng high-strength metal enclosure mismo ng kagamitang GIS bilang core low-resistance path para sa CT magnetic flux, na nagpapabuo ng buong saradong magnetic circuit. Ang okupasyon ng vertical na espasyo ay malaki ring nabawasan.
- Precise Magnetic Circuit Compensation:
- Dual-C Laminated Silicon Steel: Upang tugunan ang potensyal na hindi pantay na distribusyon ng magnetic field dahil sa non-axisymmetric equipment structure (estimated linearity deviation ≤5%), ang core ay gumagamit ng dual-C type 0.23mm high-permeability silicon steel sheet laminated modules.
- Directed Magnetic Flux Guidance: Ang symmetric C-shaped structure design ay eksaktong nagkompensate sa asymmetry ng magnetic circuit, na nagpapasiyang ang current measurement linearity deviation ay nananatiling stable sa ≤0.5% sa parehong steady-state at transient conditions (hanggang 40kA peak), na sumasakto sa Class 0.2S accuracy requirements.
- Contact Synchronization Monitoring:
- Dual Hall-Effect Sensor Synchronization: Inembed ang high-sensitivity Hall-effect sensor arrays sa key transmission nodes ng power linkage ng grounding blade.
- State Synchronized Output: Real-time collection ng open/close mechanical position status ng blade, na nagpapakamit ng high-precision time synchronization (timestamp alignment accuracy ≤1ms) sa phase current signal output mula sa CT.
Core Scenario Value: Urban Compact GIS Substations
- Spatial Compression Breakthrough: Nai-reduce ang vertical structure depth ng kagamitan ng 1.2 meters, na nagdala sa pag-optimize ng overall substation layout. Ang average footprint ng substation ay matagumpay na nabawasan ng 30% (halimbawa, 220kV GIS distribution area).
- Lifespan Consistency Design: Simplified ang integrated structure ng transmission chain. Ang CT at grounding switch ay nagbabahagi ng core moving parts (halimbawa, operating rod bearing system). Ito ay na-validate sa higit sa 10,000 full-capacity open/close operation cycles, na nagpapakamit ng synchronized mechanical lifespan targets.
- Intelligent O&M Enablement: Ang highly reliable millisecond-level synchronization ng Hall position signals at CT data ay nagbibigay ng unprecedented device-level data support para sa pag-analyze ng grounding switch operation transient currents at pagsusuri ng mga risk ng arc reignition.
Summary of Technical Advantages
Dimension
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Traditional Solution
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This Integrated Solution
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Key Improvements
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Equipment Structure
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CT at grounding switch independent
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Embedded CT sa operating rod, reused enclosure magnetic circuit
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Vertical height reduced by 1.2m
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Footprint
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Malaking base footprint
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Optimized overall layout
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Saves 30% area
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Measurement Performance
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Susceptible sa proximity effects
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Dual-C silicon steel compensates asymmetric magnetic field
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Steady/Transient accuracy ≤0.5%
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Lifespan Coordination
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Independent parts, unsynchronized lifespan
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Shared transmission chain, optimized design
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Synchronized operational lifespan to 10,000 cycles
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Condition Monitoring
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Position at current monitoring separate
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Hall sensors provide real-time synchronized phase data
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Provides millisecond-level operational transient data
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