
Pangunguna
Sa panahon ng pag-upgrade sa urban power grid, ang limitadong mga yuta ay nagbibigay ng pangunahing hamon. Ang tradisyonal na kagamitang GIS ay okupado ng malaking espasyo pataas dahil sa hiwalay na struktura ng current transformers (CTs) at grounding switches, naging botelya ng leche sa disenyo ng miniaturized substation.
Solusyon: Modular Integrated Design
Ang solusyong ito ay maipapakita ang mapagkukunan ng CT functionality sa operasyon ng grounding switch, nagpapahiwatig ng espasyo at performance breakthroughs:
- Epektibong Reuse ng Espasyo:
- Embedded CT Coil: Inalis ang tradisyonal na independiyenteng CT insulator, in-embed ang high-precision measurement coils sa loob ng inner cavity structure ng grounding switch's insulated operating rod.
- GIS Enclosure Magnetic Circuit Closure: Naglabas ng mahalagang paggamit ng high-strength metal enclosure ng kagamitang GIS bilang core low-resistance path para sa CT magnetic flux, nabuo ang buong closed magnetic circuit. Ang vertical space occupation ay malaki ang pagbawas.
- 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 epektibong kompensasyon sa magnetic circuit asymmetry, nagpapatunay na ang current measurement linearity deviation ay nananatiling stable sa ≤0.5% sa parehong steady-state at transient conditions (hanggang 40kA peak), sumasabay sa Class 0.2S accuracy requirements.
- Contact Synchronization Monitoring:
- Dual Hall-Effect Sensor Synchronization: Ang high-sensitivity Hall-effect sensor arrays ay in-embed sa key transmission nodes ng grounding blade's power linkage.
- State Synchronized Output: Real-time collection ng open/close mechanical position status ng blade, nagpapahiwatig 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: Ang equipment vertical structure depth ay bawasan ng 1.2 meters, nagpapahiwatig ng overall substation layout optimization. Ang average substation footprint ay matagumpay na bawasan ng 30% (halimbawa, 220kV GIS distribution area).
- Lifespan Consistency Design: Ang integrated structure ay simplifies ang transmission chain. Ang CT at grounding switch ay nagbabahagi ng core moving parts (halimbawa, operating rod bearing system). Pinagtibay sa higit sa 10,000 full-capacity open/close operation cycles, natutugunan ang 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 analisis ng grounding switch operation transient currents at assessment ng arc reignition risks.
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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