Compact Substation
Compact Substation (CSS)
Integrated HT, Transformer & LT Distribution in One Compact Solution
A Compact Substation (CSS) is a factory-assembled, ready-to-install electrical unit that combines High Voltage (HT) switchgear, a distribution transformer, and a Low Voltage (LT) distribution panel within a single enclosed system.
It is designed to provide safe, reliable and efficient power distribution while occupying less space, making it suitable for urban infrastructure, industrial facilities, commercial installations and other space-constrained applications.
How Does a Compact Substation Work?
The Compact Substation receives electrical power at medium-voltage levels, typically 11 kV, 22 kV or 33 kV. The integrated distribution transformer steps down the incoming voltage to the required LT level, typically 415 V, after which the LT panel distributes the power to connected loads.
HT Supply → HT Switchgear → Transformer → LT Panel → End Users
The company profile specifies CSS solutions from 100 kVA to 3 MVA and voltage levels of 11 kV / 22 kV / 33 kV.
Key Features
- Integrated Design – HT switchgear, transformer and LT panel combined in one unit
- Space Efficient – Requires less installation space
- Factory Tested & Wired – Ready for installation and commissioning
- High Safety – Metal-enclosed construction
- Reliable Power Distribution – Designed for efficient power distribution
- Low Maintenance – Simplified maintenance requirements
- Neat & Compact Construction – Suitable where space is limited
- Indoor & Outdoor Applications – Suitable for different installation environments
Technical Specifications
| Parameter | Specification |
|---|---|
| Type | Compact Substation (CSS) |
| Capacity | 100 kVA to 3 MVA |
| HT Voltage | 11 kV / 22 kV / 33 kV |
| LT Voltage | 415 V |
| Installation | Indoor / Outdoor |
| HT Section | RMU / LBS / VCB, HT Fuses, Lightning Arresters |
| Transformer Section | Oil Type or Dry Type Transformer |
| LT Section | PCC Panel with ACB / MCCB |
| Cooling | ONAN for oil-type transformer |
| Protection | Buchholz, PRD, OTI and related protection devices |
Applications
Compact Substations are suitable for:
- Industrial Plants
- Manufacturing Facilities
- Commercial Buildings
- Urban Infrastructure
- Power Distribution Networks
- Factories & Industrial Estates
- Space-Constrained Electrical Installations
Why Choose Polarity Energy?
Polarity Energy Pvt. Ltd. provides electrical power and distribution solutions covering transformers, compact substations, electrical control panels, and voltage stabilizer installation services.
- Integrated electrical solutions
- CPRI Approved
- ISO 9001 Certified
- 11 kV / 22 kV / 33 kV Solutions
- 100 kVA to 3 MVA CSS range
- Factory-tested and wired solutions
- Installation and technical support
- Electrical testing and maintenance services
Three Main Compartments
HT Compartment
- RMU / LBS / VCB
- Load Break Switch
- HT Fuses
- Lightning Arresters
Transformer Compartment
- Oil-type or dry-type transformer
- ONAN cooling for oil-type transformers
- Buchholz relay
- Pressure Relief Device (PRD)
- Oil & Winding Temperature Indicator (OTI)
LT Compartment
- PCC panel
- ACB / MCCB
- Outgoing feeders
- APFC panel as an optional arrangement
These compartment configurations are described in the company profile.