High-Performance Medium Voltage & Protection Modules
Explore certified modular solutions engineered in our high-tier Yueqing fabrication lines, built for extreme operational conditions and continuous duty cycles.
Engineered Integrity: KYN28-24 Structural & Electrical Anatomy
KYN28-24 armored removable AC metal-enclosed switchgear is an advanced MV distribution panel engineered for three-phase AC 50/60Hz networks operating at 24kV rated system voltage.
LSC2B Loss of Service Continuity
Configured with metallic partitions between all compartments (busbar, circuit breaker, cable, and low voltage control). Maintenance can be safely executed in the breaker bay while main busbars remain completely energized under continuous load.
Mandatory "Five-Proof" Interlocks
Robust mechanical and electro-magnetic interlocks systematically prevent: breaker movement under load, incorrect breaker closing, energized earthing switch closure, earthing switch grounding energization, and unauthorized compartment entry.
Internal Arc Classification (IAC AFLR)
Fabricated using 2.0mm aluminum-zinc coated sheet steel folded via multi-flanging CNC processes. Tested and certified to withstand internal arc overpressures of 25kA/31.5kA for 1.0 second, with independent pressure relief channels directed safely upward.
| Electrical Parameter Specification | Standard Unit | KYN28-24 Baseline Rating | Mingri Heavy-Duty Custom Option |
|---|---|---|---|
| Rated Voltage (Ur) | kV | 24 kV | Up to 27 kV dielectric margin |
| Power Frequency Withstand Voltage (1 min) | kV | Phase-to-Earth: 65 kV / Across Isolating: 79 kV | Enhanced Creepage Formats available |
| Lightning Impulse Withstand (BIL) | kV (Peak) | 125 kV (Common) / 145 kV (Isolating) | 145 kV High-Insulation Spec |
| Rated Operational Current (Ir) | A | 630 / 1250 / 1600 / 2000 / 2500 / 3150 | 4000A Forced Air Cooling Available |
| Rated Short-Time Withstand Current (Ik) | kA (4s) | 20 / 25 / 31.5 kA | 31.5 kA (4s Full Thermal Envelope) |
| Enclosure Protection Degree | IP Code | IP4X Enclosure / IP2X Between Compartments | IP54 Outdoor Prefabricated Enclosures |
Why Tier-1 EPCs Source KYN28-24 from Yueqing, China
The Yueqing electrical industrial corridor in Zhejiang Province integrates end-to-end manufacturing depth, reducing lead times and engineering overhead while ensuring rigorous global compliance.
Vertical Component Integration
Yueqing houses 90% of sub-tier component specialists within a 15km perimeter: vacuum interrupters, epoxy resin cast insulators, copper busbar processing, and current/voltage transformers. This localized clustering eliminates supply chain bottlenecks and cuts standard manufacturing cycles to under 20 business days.
Automated CNC Sheet Fabrication
Our intelligent factory utilizes Salvagnini and Trumpf CNC flexible manufacturing lines. Every KYN28-24 structural module is cut and punch-formed from high-tensile Al-Zn sheets without external welding, securing dimensional tolerances under Âą0.2mm for seamless truck interchangeability.
Cost-Efficiency without Spec Compromise
Global procurement teams secure up to a 35-45% cost reduction against European OEMs while matching ABB UniGear ZS1 or Schneider MCset performance specifications. Mingri provides complete type testing verification through accredited laboratories including KEMA, ASTA, and CNAS.
Universal Compliance & Turnkey EPC Localization
Global grid connections demand adherence to distinct statutory directives, seismic regulations, and communication protocols. Mingri engineers resolve multi-jurisdictional compliance prior to freight dispatch.
IEC / IEEE / GB Harmonization
Fully compliant with IEC 62271-200, IEC 62271-1, IEEE C37.20.2, and GB 3906. Complete dual-labeled documentation, schematics, and bilingual terminal tagging provided standard.
Substation Automation & SCADA
Native integration of microprocessor protection relays supporting IEC 61850 MMS/GOOSE, Modbus-RTU, and DNP3. Pre-wired fiber optic communication backbones ready for modern digital substations.
Harsh Environment Packaging
Special tropicalization treatments, anti-condensation heaters with automatic digital humidistats, and corrosion-resistant C4/C5 hardware for high-salinity coastal or desert mining deployments.
Field Commissioning & Spares
Full FAT / SAT engineering protocols, cloud-based video engineering supervision, and modular 10-year spare parts inventories packed in climate-proof maritime crating.
Mission-Critical Applications of KYN28-24 Panels
From multi-megawatt renewable generation plants to demanding heavy industrial facilities, our 24kV assemblies maintain uninterrupted distribution stability.
Utility Solar & Wind Farm Collector Substations
Designed to handle frequent capacitive switching surges, solar inverter harmonics, and severe ambient thermal swings. Provides robust circuit isolation and step-up transformer protection in 20kV-24kV renewable collector loops.
Petrochemical & Metallurgy Processing
High short-time withstand ratings (31.5kA/4s) safeguard continuous-process refinery pumps, arc furnace feeders, and rolling mills against sudden grid transients and voltage sags, avoiding multimillion-dollar plant shutdowns.
Hyperscale Data Centers & Transit Infrastructure
Paired with fast-acting automatic transfer switches (ATS) and intelligent digital tripping units, KYN28-24 ensures Tier III and Tier IV uptime reliability across central computing facilities and urban electric traction systems.
Industry Evolution: The Next Decade of 24kV Switchgear
Strategic modernization is transforming medium-voltage distribution from purely electromechanical isolation toward predictive, cyber-physical ecosystems.
IoT-Enabled Predictive Diagnostics
Integration of wireless SAW temperature sensors on primary tulip contacts, non-invasive partial discharge (TEV/UHF) tracking, and breaker mechanical curve profiling for real-time condition-based maintenance.
SF6-Free & Eco-Conscious Interruption
With tightening F-gas regulations worldwide, KYN28-24 utilizes clean vacuum arc extinguishing paired with dry air or clean-air alternative insulations, leaving zero environmental footprint and zero global warming potential (GWP).
Digital Twins & Motorized Remote Racking
Safety-first automated truck racking: technicians rack breakers between "Service" and "Test" positions via remote tablets outside the arc flash boundary, fully aligned with NFPA 70E electrical workplace safety codes.
Frequently Asked Questions on KYN28-24 Switchgear
Detailed engineering and procurement insights compiled by Mingri Electric's chief application engineers.
Q. What distinguishes KYN28-24 from KYN28-12 switchgear?
The primary differentiation lies in the insulation class, phase clearance, and creepage distances. KYN28-24 is engineered specifically for 24kV rated networks, requiring 125kV BIL impulse withstand and minimum 180mm electrical air clearance (or composite solid barrier insulation), whereas KYN28-12 is built for 12kV networks with 75kV BIL. Cabinet dimensions for the 24kV unit are consequently wider (typically 1000mm vs 800mm).
Q. Can KYN28-24 accept circuit breakers from third-party brands?
Yes. While Mingri manufactures proprietary high-end VS1 vacuum circuit breaker handcarts calibrated for KYN28-24, our chassis guides and primary plug tulip interfaces can be customized to dock ABB VD4, Schneider EVLIS, or Siemens SION vacuum circuit breakers upon EPC request.
Q. How does Mingri guarantee mechanical interlock reliability?
Our interlocking mechanisms are CNC-machined from hardened stainless steel linkages. Every switchgear cubicle undergoes 2,000 continuous manual and motorized interlock test cycles during our internal Quality Acceptance Test (QAT) before passing to factory testing.
Q. What documentation is provided for international utility approval?
We supply comprehensive design documentation packages: Single-Line Diagrams (SLD), 3D footprint layouts, schematic wiring diagrams, complete certified routine test certificates (dielectric, contact resistance, mechanical timing), and type test reports from internationally recognized test bodies.
Associated Substation, Breaker & Distribution Equipment
Complementary medium and low voltage balance-of-plant apparatus to complete your primary substation infrastructure packages.
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