High-voltage control cabinets are critical assets in power distribution and motor control for heavy industries – mining, cement, water treatment, petrochemicals, and utilities. Unlike low-voltage panels, these cabinets operate at 3kV to 35kV, requiring rigorous design, premium materials, and strict safety compliance. Off-the-shelf solutions rarely meet the diverse demands of different sites, load profiles, and protection schemes. At Huadong Industry Control, we specialise in custom-engineered HV cabinets – designed and built exactly to your technical specifications, ensuring reliable operation in your specific environment.
1.Why Customisation Is Essential for High-Voltage Applications
High-voltage systems are not plug-and-play. Factors like fault current levels, ambient conditions, relay coordination, and physical space vary significantly between projects. A cabinet that works perfectly in a temperate indoor substation may fail in a tropical outdoor installation or a high-altitude mining site. Standard designs may not accommodate your preferred vacuum or SF6 circuit breaker models, or your desired protection relay brand. Customisation addresses all these variables, delivering a cabinet that performs safely and efficiently in your exact application – without compromises.
2.What We Can Tailor in Your HV Cabinet
Voltage and Current Ratings – We design cabinets for any system voltage from 3kV to 35kV, with current ratings from 200A to 4000A. Busbar cross-sections, insulator creepage distances, and internal clearances are calculated based on your nominal voltage and prospective short-circuit current.
Main Switching Devices – You choose the circuit breaker technology and brand: vacuum, SF6, or hybrid. We integrate models from leading manufacturers (Siemens, ABB, Schneider, or Chinese premium brands) based on your preference and maintenance practices.
Protection and Control Scheme – We implement your specified protection functions – overcurrent, earth fault, differential, distance, or directional. Relays can be electromechanical, solid-state, or numerical (IEC 61850 compatible). Interlocking logic, synchronisation checks, and auto-reclosing sequences are programmed to match your network requirements.
Enclosure Construction and IP Rating – For indoor installations, metal-clad or metal-enclosed designs with IP4X are standard. For outdoor or harsh environments, we provide weatherproof enclosures (IP54 to IP66) with anti-corrosion coatings, sun shields, and forced ventilation or heating systems.
Physical Dimensions and Layout – We adjust cabinet depth, width, and height to fit your substation footprint and cable entry/exit points. Front-access or rear-access designs, cable compartments, and busbar chambers are arranged for safe operation and convenient maintenance.
3.Our Custom Design Process for HV Cabinets
Stage 1 – Technical Specification Review
We collect your single-line diagram, load data, system fault level, protection philosophy, and site conditions. Our engineering team performs a gap analysis against standard designs, identifying all custom elements.
Stage 2 – Detailed Engineering and Drawings
We produce manufacturing drawings, electrical schematics, and GA (general arrangement) views for your approval. This includes dimensioned layouts, busbar routing, cable entries, and grounding details.
Stage 3 – Component Sourcing and Assembly
All major components – breakers, CTs, VTs, relays, surge arresters, and busbars – are sourced per your approved list. Assembly follows our ISO-certified production procedures, with torque-controlled bolting and precise wiring.
Stage 4 – Factory Testing
Each cabinet undergoes a comprehensive routine test: insulation resistance, power frequency withstand voltage, primary and secondary injection, and mechanical endurance. Optional type tests (temperature rise, short-circuit withstand, internal arc) can be conducted at accredited labs.
Stage 5 – Documentation and Delivery
We provide English-language manuals, wiring diagrams, test reports, and spare parts lists. Packaging for export includes corrosion protection, shock bracing, and lifting instructions.
We have been designing and supplying HV control cabinets for over 20 years, working with clients in power generation, transmission, and large-scale industrial projects. Our team of experienced HV engineers understands the nuances of arc protection, insulation coordination, and switching transient management. We provide full technical support from specification to commissioning, and our after-sales service includes remote diagnostics and spare parts supply.
