Introduction to 315 kVA Mini Substations
The 315 kVA mini substation is a compact, pre-engineered power distribution unit that integrates a medium-voltage (MV) switchgear, distribution transformer, and low-voltage (LV) switchboard into a single enclosure. These substations are especially popular in small industries, commercial buildings, and infrastructure projects where space and quick deployment are key concerns.
This article covers key information about the 315 kVA mini substation price, influencing factors, technical features, and installation dimensions.
Price Range for 315 kVA Mini Substation
The price of a 315 kVA mini substation depends on several factors, including transformer type, protection systems, and enclosure material. Below is a general price estimate:
| Configuration | Estimated Price (USD) |
|---|---|
| Basic Oil-Immersed Transformer | $7,500 – $9,000 |
| Dry-Type Transformer | $9,000 – $11,500 |
| With Ring Main Unit (RMU) | $11,000 – $13,000 |
| With Smart Monitoring (IoT Enabled) | $13,000 – $15,000 |
Standard Technical Specifications
| Parameter | Value |
| Rated Power | 315 kVA |
| Primary Voltage | 11 kV / 13.8 kV / 33 kV |
| Secondary Voltage | 400/230 V |
| Frequency | 50 Hz or 60 Hz |
| Cooling Type | ONAN (Oil) or AN (Dry) |
| Vector Group | Dyn11 |
| Impedance | ~4–6% |
| Standards | IEC 60076, IEC 62271, GB, ANSI |
Core Components Included
A mini substation typically integrates the following:
MV Section:
- Incoming load break switch or VCB
- Surge arresters and fuses
- RMU (optional)
Transformer Section:
- 315 kVA oil-immersed or dry-type transformer
- Oil containment tank or sealed resin body
LV Distribution Panel:
- MCCBs / ACBs / MCBs for outgoing feeders
- Optional capacitor bank for power factor correction
- Energy metering and remote monitoring (if smart)
Typical Size & Footprint
| Substation Type | L x W x H (mm) | Weight (Approx.) |
| Oil Type, Metal Enclosure | 2800 x 1600 x 2000 | ~2500 kg |
| Dry Type, Metal Enclosure | 2600 x 1400 x 1900 | ~2300 kg |
| Concrete Kiosk Type | 3200 x 1800 x 2200 | ~3000 kg |
Installation Considerations
- Requires flat concrete plinth (200–300 mm above grade)
- Side clearance ≥ 1000 mm for maintenance
- Overhead clearance ≥ 2500 mm for ventilation
- Earth resistance target < 1 ohm
- Oil pit for containment if oil-immersed type
Typical Applications
- Residential and commercial complexes
- Hotels, hospitals, and shopping malls
- Telecom towers and data centers
- Small-scale industrial units
- Renewable energy distribution points
Frequently Asked Questions (FAQs)
Q1: How long does delivery take?
Standard delivery time is 3–5 weeks depending on configuration and stock.
Q2: Can this substation be installed indoors?
Yes, especially dry-type versions with proper ventilation and IP-rated enclosures.
Q3: What protection devices are included?
Basic models include fuses and MCCBs; advanced units include relays, earth fault, and overcurrent protection.
Conclusion
The 315 kVA mini substation is a compact yet powerful solution for low-to-medium voltage power distribution. With customizable options and competitive pricing, it delivers high performance, safety, and space efficiency for modern distribution networks.
Optimized power delivery begins with the right-sized substation.
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