Selection Recommendations Section

"Choosing the right switchgear saves more than just budget—it saves the O&M costs of the next decade."

1-1. High Voltage Switchgear Selection Guide（11kV/24kV/27kV/33kV/38kV/10kV/35kV）

Step 1：Clarify Basic Parameters (Customer Self-Check List)

ParameterWhy It MattersCommon Pitfalls
Rated VoltageDetermines insulation level and cubicle dimensionsA 35kV project mistakenly selects a 12kV cubicle—scrapped outright
Rated CurrentDetermines busbar specifications and temperature riseSelect based on peak load, leave 20% margin
Short-Circuit Breaking CurrentDetermines circuit breaker capabilityIgnoring maximum system short-circuit current—undersized selection can explode
Protection DegreeDetermines cubicle sealing methodIP40 vs IP41, IP4X vs IP54—huge difference between outdoor/indoor
Operating MechanismManual/motorized/springUnattended substations must be equipped with motorized + remote

Step 2: Cubicle Type Quick Reference Table

Application ScenarioRecommended Cubicle TypeKey Rationale
Urban SubstationKYN28A-12Withdrawable type, easy maintenance, mainstream application
Industrial & Mining EnterprisesXGN15-12 (Ring Main Unit)Compact, low cost, maintenance-free
Data CenterDual Power + Bus Tie CubiclePower supply continuity is top priority
Offshore Platform/ChemicalFully Enclosed Gas-Insulated Cubicle (C-GIS)Corrosion-resistant, explosion-proof, adapts to harsh environments

⚠️ Three Common Misconceptions in Customer Selection

  • Only looking at price, not short-circuit capacity — Cheap cubicles work in systems with small short-circuit currents, but once the system expands, it becomes a hidden danger
  • Ignoring five-prevention interlocks — Inadequate mechanical interlocks lead to misoperation and direct injury
  • Insufficient cable compartment space — During later capacity expansion, cables cannot be connected, forcing cubicle replacement

1‑2. Low Voltage Switchgear Selection Guide (0.4kV)

Core Selection Dimensions

Load Type → Determines choice of withdrawable/fixed partition/frame circuit breaker

├── Motor Load (frequent start/stop) → MCC Cubicle + Molded Case Circuit Breaker

├── Capacitor Compensation → Dedicated Reactive Power Compensation Cubicle

├── Lighting/Small Power → Fixed Partition Type is Sufficient

└── Main Incoming/Bus Tie → Air Circuit Breaker (ACB) + Intelligent Protection Unit

Cubicle Type Comparison Overview

Cubicle TypeApplicable ScenarioAdvantagesLimitations
GGDSmall factories, temporary power for infrastructureLow price, simple structureAverage safety, inconvenient maintenance
GCK/GCSCommercial buildings, medium-sized factoriesWithdrawable, maintenance without power outageLarge depth, medium cost
MNSLarge-scale industry, data centersHighest modularity, best safetyRelatively high price
BlokSeT/MDmaxHigh-end projects, foreign-funded factoriesInternational brand quality, complete certificationsLong lead time, obvious premium

Golden Rules of Selection

Rated current of main incoming cubicle circuit breaker ≥ 1.2× transformer rated current

Number of feeder cubicles = Actual number of circuits × 1.3 (reserve 30% spare circuits)

1‑3. Industry-Customized Selection Recommendations

IndustrySpecial RequirementsOur Recommended Solution
New Energy PV/WindDC component, large harmonicsAdd Active Power Filter (APF) + Dedicated surge protection module
Hospital/Data CenterZero interruptionDual power ATS + Bus tie auto-transfer & auto-recovery + Online monitoring
Metallurgy/MiningHeavy dust, strong vibrationIP54 protection + Seismic design + Dust filter
Chemical/PetroleumExplosion-proof, corrosion-proofExplosion-proof certified cubicle + Positive pressure ventilation/sand-filled structure
Rail TransitLimited spaceCompact gas-insulated cubicle + Seismic brackets
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