Unitised Sub-Station (USS)
The MOBY Unitised Sub-Station (USS) is an integrated, factory-assembled, outdoor compact substation designed to replace conventional open-yard substations. Housing an MV Ring Main Unit / Load Break Switch, an energy-efficient distribution transformer (up to 1000 kVA), and an LT distribution switchboard with APFC power factor correction within a single tamper-proof, tropicalized enclosure, the USS slashes required civil land area by over 75%.
Comprehensive Technical Specifications
Detailed parameter ratings, insulation limits, standards compliance, and fabrication tolerances engineered for Unitised Sub-Station (USS).
| Technical Parameter | Engineering Specification | Compliance Standard / Condition |
|---|---|---|
| 🔷 General System & Rating Architecture | ||
| Rated Power Capacity | 100 kVA, 250 kVA, 400 kVA, 500 kVA, 630 kVA, 750 kVA, 1000 kVA | Standard Ratings |
| Rated High Voltage (HV) | 6.6 kV / 11 kV / 12 kV / 22 kV / 24 kV | IS 14786 / IEC 62271-202 |
| Rated Low Voltage (LV) | 415 V / 433 V AC, 3-Phase, 4-Wire, 50 Hz | LT Distribution |
| Internal Sub-Compartments | Three physically segregated chambers: MV Switchgear, Transformer, and LV Board | Fully Isolated |
| Footprint Comparison | Requires less than 25% of conventional brick-and-mortar substation area | Compact footprint |
| Ambient Operating Range | -5°C to +50°C tropical ambient | Weatherproof Outdoor |
| 🔷 Compartment 1: Medium Voltage Switchgear | ||
| MV Switchgear Type | Compact SF6 Insulated Ring Main Unit (RMU) or Air-Break Load Break Switch (LBS) | IEC 62271-200 |
| Configuration | 2-Way Incomer + 1-Way Transformer Feeder (CCF / CCCF) or VCB Breaker | Extensible |
| Short-Time Withstand | 20 kA / 21 kA for 3 Seconds | CPRI Tested |
| Safety Interlocks | Integral earthing switch with mechanical padlockable interlocks | Operator Safe |
| 🔷 Compartment 2: Transformer Chamber | ||
| Transformer Type | Hermetically Sealed Oil Immersed (ONAN) or Cast Resin Dry Type (AN) | BEE Star Compliant |
| Vector Group & Impedance | Dyn11, 4.5% to 5.0% impedance | IS 2026 / IS 1180 |
| Core & Coil | Prime CRGO core with electrolytic copper / aluminium windings | High Efficiency |
| Ventilation System | Natural thermodynamic cross-ventilation louvers with vermin wire mesh | IP23/IP33 chamber |
| 🔷 Compartment 3: Low Voltage Distribution Board | ||
| LV Incomer Switchgear | 4-Pole Air Circuit Breaker (ACB) or Molded Case Circuit Breaker (MCCB) | IS 13947-2 |
| Outgoing Feeders | Multiple MCCB / SDF feeders tailored to customer distribution layout | Compartmentalized |
| Integrated APFC | Optional built-in automatic power factor correction capacitor bank (50–250 kVAr) | Power Quality |
| Metering & Monitoring | Class 0.5S digital multi-function power meter with Modbus RTU telemetry | Energy Auditing Ready |
| 🔷 Kiosk Enclosure & Fabrication | ||
| Enclosure Material | Double-skin thermal insulated Galvanized Sheet Steel / ALUZINC (2.0mm thickness) | Corrosion Proof |
| Surface Finish | Epoxy primer followed by electrostatic pure polyester powder coat (RAL 7035 / Green) | Anti-UV Coating |
| Security & Vandal Proofing | Internal concealed door hinges, three-point lockable handles with padlock shrouds | Public Area Safe |
Key Engineering & Operational Features
Why electrical consultants, industrial plants, and utility engineers specify MOBY Unitised Sub-Station (USS).
Over 75% Civil Land Area Savings
Compact monolithic layout eliminates the need for sprawling brick substation buildings, outdoor security fences, and open yard trenches, conserving valuable commercial real estate.
Factory Assembled & Pre-Commissioned
The entire substation—RMU, transformer, and LT panel—is pre-wired, busbar-coupled, and fully tested in our Kolkata factory, enabling same-day site plug-and-play energization.
Total Public & Operator Safety
All live conductors are fully enclosed in earthed metal compartments. Padlockable double doors with safety interlocks make it completely safe for installation in crowded parks and streets.
All-Weather Double-Skin Kiosk
Double-wall thermally insulated galvanized steel kiosk prevents solar radiation buildup inside the chambers while resisting driving rain, coastal humidity, and corrosive dust.
Integrated Energy Management
Equipped with secondary digital energy meters, APFC capacitors, and communication gateways that feed real-time power parameters directly to remote SCADA networks.
Tremendous Project Cost Reduction
Eliminates civil architects, bricklaying, cable tray fabrication, and multi-vendor coordination, drastically lowering overall substation turnkey execution costs.
Certified Quality & Factory Testing Standards
Every Unitised Sub-Station (USS) is manufactured under strict ISO 9001:2008 quality control protocols and subjected to comprehensive routine testing at our Kolkata facility before dispatch.
Target Industrial Sectors & Deployment Scenarios
Engineered and tested for severe continuous operational duty across diverse sectors:
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Frequently Asked Questions
Authoritative engineering answers regarding voltage ratings, CPRI testing, custom SLD fabrication, and warranty for Unitised Sub-Station (USS).
What are the technical voltage and breaking ratings for MOBY Unitised Sub-Station (USS)? +
Primary Parameter Ratings: MOBY Unitised Sub-Station (USS) is engineered for rated voltage Up to 1000 kVA and rated normal current Up to 12 kV / 24 kV. It is built to withstand prospective short-circuit breaking currents up to 40 kA for 3 seconds, fully adhering to national and international power engineering guidelines.
Is MOBY Unitised Sub-Station (USS) CPRI tested and certified? +
Certification & Type Testing: Yes, MOBY Unitised Sub-Station (USS) is IS 14786 / IEC 62271-202 Compliant. All switchgears undergo comprehensive type-testing at the Central Power Research Institute (CPRI) and are routine tested (high-voltage dielectric withstand, contact resistance, and operational timing) at our ISO 9001:2008 certified Kolkata manufacturing facility prior to customer dispatch.
Can this equipment be customized according to our single-line diagram (SLD)? +
Custom Engineering Capabilities: Yes, Moby Electrotech specializes in custom-engineered electrical switchgear systems. Our Kolkata engineering team customizes incoming/outgoing feeder arrangements, CT/PT ratios, numerical protection relays, busbar ratings, enclosure dimensions, and ingress protection (IP42 to IP55) to match your exact site layout and SLD.
What is the standard warranty and quotation timeline for Unitised Sub-Station (USS)? +
Commercial Terms & Warranty: All MOBY equipment carries an engineering equipment warranty of 12 months from commissioning or 18 months from delivery. Technical commercial quotations are typically provided within 24 to 48 hours following single-line diagram (SLD) review.
Request Technical Quote for Unitised Sub-Station (USS)
Our senior electrical engineering team will review your single-line diagram (SLD), system voltage, and breaking requirements to provide a competitive quotation within 24 hours.