11 kV Pole Mounted Substation Overview and Applications
An 11 kV Pole Mounted Substation is a compact, elevated power distribution solution primarily used in rural, semi-urban, and industrial areas where ground-mounted substations are impractical or cost-prohibitive. By mounting the substation equipment on poles, utilities can reduce space requirements while maintaining reliability and performance in medium-voltage distribution networks.
What is an 11kV Pole Mounted Substation?
A pole-mounted substation transforms 11,000 volts (11 kV) of medium-voltage power into a lower voltage—typically 400/230 volts—for end-user consumption. Unlike ground-mounted units, this type of substation is elevated on poles (concrete, steel, or wooden), making it ideal for locations with:
- Limited land availability
- Flood-prone or hilly terrain
- Quick deployment requirements
Key Components of a Pole Mounted Substation
A typical 11kV pole-mounted substation includes:
- 11kV Distribution Transformer (e.g., 25 kVA to 250 kVA)
- HT Fuses or Drop-Out Fuses
- Lightning Arresters
- Isolators / Disconnectors
- Low Voltage Distribution Box
- Earthing and Pole Structure
Standard Ratings and Configuration
| Parameter | Value Range |
|---|---|
| Primary Voltage | 11 kV |
| Secondary Voltage | 400 V / 230 V |
| Transformer Rating | 25–250 kVA |
| Mounting Type | Single Pole / H-Pole / 4-Pole |
| Cooling | ONAN (Oil Natural Air Natural) |
| Phase Configuration | 3-Phase, 3-Wire or 4-Wire |
Advantages of Pole Mounted Substations
- ✅ Space-Efficient – No need for land acquisition
- ✅ Cost-Effective – Lower civil construction costs
- ✅ Quick to Install – Less on-site work compared to ground substations
- ✅ Elevated Protection – Reduced risk of theft or water damage
- ✅ Low Maintenance – Fewer moving parts, minimal manual supervision
Price of 11 kV Pole Mounted Substations
The total cost depends on transformer capacity, mounting structure, and protective gear. Here’s a rough guide:
| Transformer Rating | Typical Cost (USD) | Includes |
|---|---|---|
| 25 kVA | $2,000 – $2,800 | Transformer, arresters, fuses |
| 63 kVA | $2,800 – $3,500 | Full pole-mounted kit |
| 100 kVA | $3,800 – $4,600 | With isolators, protection, wiring |
| 250 kVA | $5,500 – $7,000 | Heavy-duty structure & accessories |
💡 Prices are estimates and may vary by country, supplier, and customization.
Where Are Pole Mounted Substations Used?
- ✅ Rural Electrification Projects
- ✅ Agricultural Farms & Irrigation Systems
- ✅ Mining Sites
- ✅ Roadside Industrial Units
- ✅ Small Residential Communities
- ✅ Railways and Highway Lighting
Compliance and Standards
An 11 kV pole-mounted substation typically adheres to:
- IEC 60076 (Power Transformers)
- IS 1180 (Indian Standards for Distribution Transformers)
- ANSI C57 (U.S. Standard)
- Local electrical codes and utility requirements
FAQs About 11 kV Pole Mounted Substations
Q1: What is the lifespan of a pole-mounted substation?
A: With proper maintenance, 20–25 years is common for outdoor-rated equipment.
Q2: Is it safe to use in areas with high lightning risk?
A: Yes. Lightning arresters and surge protection devices are standard.
Q3: Can it be used with solar or backup generators?
A: Yes. Pole-mounted units can integrate with alternate energy sources through proper switching.
