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35kV Mining Skid-Mounted Outdoor Substation

A Robust Mobile Power Solution Tailored for Extreme Mining Environments

The 35kV Mining Skid-Mounted Outdoor Substation by Zhejiang Tianrun Electric Equipment Co., Ltd. is a high-reliability, mobile power distribution solution specifically designed for open-pit mines, remote mining areas, and temporary power supply scenarios. This integrated substation combines 35kV high-voltage switchgear, a 10,000 kVA S20-M series oil-immersed transformer, and a 6kV low-voltage distribution system into a single skid-mounted unit that can be quickly transported and deployed without the need for fixed foundations.

The substation features a ship-shaped reinforced steel chassis with the transformer centrally located and high/low voltage compartments on either side, connected via sealed cable bridges. It is engineered to withstand extreme conditions such as temperatures ranging from -45°C to +50°C, severe wind and sandstorms, and large daily temperature fluctuations, ensuring continuous operation in harsh mining environments.

At the heart of the system is the S20-M-10000/35 energy-efficient oil-immersed power transformer, which provides excellent performance, durability, and environmental adaptability.

Products

Features

Superior Environmental Adaptability

Operating Temperature Range: -45°C to +50°C (using high-quality No. 45 transformer oil)

Protection Rating: IP44D, providing effective protection against dust, small animals, and rainwater ingress

Enclosure made from ≥5mm thick steel plates with double-sealed structures; all cabinet doors are waterproof

Equipped with an automatic heating and dehumidification system to prevent condensation and ensure electrical safety

High Reliability and Safety

Comprehensive relay protection system including differential protection, body protection, high/low backup protection

Microprocessor-based protection devices (XR-200 series) support "Four Remote" functions (Telemetry, Telecontrol, Telecommand, and Teleadjustment)

High and low voltage rooms are independently isolated with pressure relief channels to prevent internal fault propagation

The entire station is equipped with five-prevention interlock functions to eliminate the risk of operational errors

Modular, Mobile, and Easy Maintenance

Ship-shaped reinforced chassis (≥11.2m long × ≥3.5m wide) with three longitudinal towing hooks and four lifting points

Chassis plate thickness ≥15mm, side panels ≥20mm, wear-resistant and anti-deformation

All cabinet doors feature pin-type locks and double-glazed observation windows (≥45×30cm), external operation handles allow maintenance without opening cabinets

Pre-wired and pre-commissioned at the factory, only requiring connection on-site before operation

Intelligent and Energy-Efficient

Transformer meets GB 20052-2020 Energy Efficiency Level 2 standards, offering low no-load and load losses

Equipped with HUAWEI UPS2000-A-3K long-life power supplies and XRP-2000 DC110V rectifier modules

Supports remote monitoring, fault recording (pre-fault 4 cycles + post-fault 8 cycles), and a user-friendly Chinese LCD interfac

Professional Grounding and Electromagnetic Compatibility

Dual grounding points for both working ground and protective ground, complying with SDJ8-1979 standards

Grounding conductors use 30×4mm copper busbars, terminals are ≥M12 copper bolts for easy testing

Parameters

Specification	Details
Rated Voltage	High Voltage Side: 35kV (±2×2.5%) Low Voltage Side: 6.3kV
Transformer Model	S20-M-10000/35
Rated Capacity	10,000 kVA
Connection Group	Dyn11
Voltage Regulation Method	Off-circuit tap changer, 5 steps (each step 2.5%)
Cooling Method	ONAN (Natural Oil Immersion Self-Cooling)
Transformer Oil	Premium No. 45 Insulating Oil (suitable for -45°C)
High Voltage Switch	VD4-40.5/1250A-40kA Vacuum Circuit Breaker
Low Voltage Switch	VD4-12/1250A-40kA (110VDC control)
Neutral Point Grounding	GE7.5kV/91kW/145Ω Resistor Cabinet + Voltage/Current Transformers
Protection Device	XR-200 Series Microprocessor-Based Protection (DC110V), supports Ethernet + RS485 communication
Enclosure Protection Rating	IP44D
Chassis Dimensions (L×W×H)	≥11.2m × ≥3.5m × ≥0.5m
High Voltage Room Dimensions	≥4.0m × ≥2.5m × ≥2.75m
Low Voltage Room Dimensions	≥2.2m × ≥2.3m × ≥2.5m
Operating Altitude	≤1400 meters
Certifications	Complies with IEC, GB, and relevant industry standards (CE, ISO, IEEE certifications available upon request)

Typical Applications

•Large Open-Pit Coal/Metal Mines: Suitable for high-altitude, cold, and sandy regions like the PingShuo mining area in Shanxi Province, supporting frequent relocation
•Remote Areas Temporary Power Supply: Ideal for rapid deployment in infrastructure projects such as railways, highways, and water conservancy
•Emergency Repair and Backup Power: Quick restoration of power after natural disasters or grid failures
•Renewable Energy Integration: Step-up and grid connection nodes for wind farms and photovoltaic power plants
•Industrial Plant Expansion: Rapid deployment of additional loads without the need for civil construction