1. Underground Utility Trench System
Torrent Power’s electrical layout uses pre-cast concrete utility trenches to organize cables and simplify maintenance:
- Dry Utility Trench Allocation: Electricity cables are housed in dedicated dry utility compartments, separate from wet utilities (such as water supply and sewage lines) to prevent electrical short-circuits.
- Voltage Segregation: High-voltage transmission feeds (33kV and 11kV) are separated from low-voltage distribution cables (415V three-phase and 230V single-phase) using distinct cable ladder racks.
- Thermal Protection: Underground cables are wrapped in Cross-Linked Polyethylene (XLPE) insulation with steel wire armoring, protecting the lines from moisture and temperature fluctuations.
2. DSIRDA Substation Setbacks & Technical Standards
To maintain electrical safety standards across residential, commercial, and industrial plots, DSIRDA enforces strict boundary rules:
- Transformer Setback: Any localized step-down transformer or ring main unit (RMU) must be placed inside the plot boundary, maintaining a minimum setback clearance of 3.0 meters from the street line.
- Access Requirements: Substation chambers must feature direct access roads at least 6.0 meters wide to allow Torrent Power maintenance vehicles to reach the equipment.
- Masonry Enclosures: Step-down installations must be enclosed within a solid brick masonry wall at least 2.0 meters high, fitted with warning signs.
The table below lists the technical parameters of Dholera’s underground power grid:
| Grid Parameter | Cable Type / Voltage | Installation Depth | Protection Standard |
|---|---|---|---|
| **High-Voltage Feeders** | 33kV & 11kV XLPE copper/aluminum | 1.2 to 1.5 Meters | Segregated steel ladder racks within dry ducts |
| **Low-Voltage Distribution** | 415V (3-Phase) & 230V (Single-Phase) | 0.8 to 1.0 Meters | Direct buried inside HDPE pipe conduits |
| **Trench Isolation** | Fire-retardant concrete partitions | N/A | Separates power lines from gas/water pipes |
| **Substation Setbacks** | Step-down RMUs & Transformers | Ground/Elevated | Min. 3.0-meter clearance from plot margins |
| **Grid Redundancy** | Dual-loop ring configuration | N/A | Automated breaker switching within 50ms |
3. Key Advantages for Industrial and Plotted Developers
- Continuous Power Supply: Because Dholera’s power cables are buried, the grid is protected from high winds, storms, and traffic accidents that typically cause blackouts on overhead grids.
- Clean Streetscapes: The absence of overhead poles, overhead lines, and hanging wires improves visibility and allows for larger trees to line the streets.
- Reduced Power Loss: The use of high-efficiency XLPE insulated cables lowers transmission losses compared to traditional overhead aluminum lines.
Frequently Asked Questions (FAQ)
#### Are there overhead power cables in Dholera SIR?
No. Under DSIRDA guidelines, all power distribution lines are laid underground inside concrete utility ducts beneath the pedestrian walkways.
#### Who manages the power grid in Dholera?
The electrical grid in Dholera SIR is managed by Torrent Power, which acts as the official licensee for power distribution in the region.
#### What is the setback distance for local substations?
All transformers and substation units must maintain a minimum setback distance of 3.0 meters from the plot boundary and be enclosed by a protective masonry wall.
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