Mining Substation Product Introduction

1. Product Brief Introduction

The mining substation is a complete set of explosion-proof, shock-resistant and anti-interference power transformation and distribution equipment specially designed for mine open-pit and underground mining scenarios. It is divided into mining flameproof type and mining general type. It integrates transformers, high and low voltage flameproof switches, mining protection and monitoring devices, reactive power compensation and other core components into an explosion-proof sealed cabinet/mobile skid-mounted base. It is suitable for high voltage and high gas, explosive gas explosion risk, strong vibration and corrosive environment in mines, realizing safe power supply for mine mining, ventilation, drainage, water supply and other equipment, as well as voltage reduction distribution and fault protection. It is the core power distribution and protection equipment for mine production, and all designs and manufacturing comply with mine explosion-proof safety regulations.

2. Scope of Application

• Underground scenarios: Coal mines/metal mines underground mining faces, shaft bottom yards, electromechanical chambers, transportation roadways and other areas with gas/coal dust explosion risks (flameproof type)
• Surface scenarios: Open-pit mining sites, ore dressing plants, mine stockyards, gangue yards, mine industrial squares and other areas with high dust, strong vibration and outdoor open-air conditions (general type / increased safety type)
• Mobile configuration: Exclusive power supply for large mining equipment such as mine underground working faces, drainage pumps, hoists, roadheaders, shearers, etc.
• Temporary power supply: Temporary/mobile power supply for underground comprehensive mining working faces and open-pit mobile mining sites (mobile skid-mounted mining substation)
• Voltage level: 6kV/10kV high-voltage incoming line, 0.4kV/1.14kV low-voltage outgoing line (mine-specific low-voltage grade), covering power supply for small, medium and large power loads in mines

3. Model Definition (Compiled according to Mining Explosion-proof Standard, MT/T Industry Specification)

The model number of mining substation is compiled by mining explosion-proof code + equipment type + voltage level + capacity + structure code. The core model numbers include underground flameproof type KBSGZY-10/0.69-500 and surface general type KYD-10/0.4-800. The definition of each part conforms to mine specifications with high identification:

3.1 Underground Flameproof Type (Core)

• K: Mining flameproof type (explosion-proof code Exd I, suitable for underground gas environment); increased safety type is marked with A
• BS: Mining dry-type transformer (oil-free, mandatory for underground mines)
• GZY: Combined mobile type (Z - Combined, Y - Mobile, skid-mounted base, suitable for underground mobile power distribution)
• 10/0.69: Rated voltage, 10kV (mainstream in mines) / 6kV on high voltage side, 0.69kV/1.14kV on low voltage side (mine-specific low voltage, suitable for large mining equipment)
• 500: Rated capacity of transformer, unit kVA, commonly used 200/315/500/800kVA underground

3.2 Surface General Type

• KYD: Mining general prefabricated substation (Y - Prefabricated, D - Substation)
• 10/0.4: Rated voltage, 10kV on high voltage side, 0.4kV (conventional low voltage) on low voltage side
• Extended code: L - Open-air type / Q - Skid-mounted type / Z - Intelligent type, marking surface environmental characteristics
• Explosion-proof supplement: Marked as Exib I (intrinsically safe type) for surface areas with slight explosive gas risk

4. Working Conditions

4.1 Environmental Conditions (Adapt to Harsh Environment in Mines)

• Ambient temperature: -5℃~40℃ underground, -30℃~+55℃ on surface (open-air high temperature design)
• Relative humidity: ≤95% (at 25℃), short-term condensation is allowed (equipped with dehumidification device)
• Altitude: ≤2000m (mainstream in mines), customized capacity for altitude >2000m
• Explosion-proof requirement: Underground areas must meet GB3836.1~4-2010 explosion-proof standard, no open fire and no electric spark leakage
• Environmental medium: Withstand underground gas, coal dust, surface dust, sulfide corrosive gas, rainwater (open-air mines)
• Vibration and impact: Withstand mine mining and transportation vibration (acceleration ≤5g), and underground skid-mounted type is equipped with anti-vibration buffer structure
• Installation space: Compact design for underground confined chambers/roadways with narrow space, meeting the installation spacing specifications of mine equipment

4.2 Electrical Working Conditions (Conform to Mine Power Distribution Specifications)

• Power frequency: 50Hz±1Hz (high precision frequency requirement for mines)
• Voltage fluctuation: ±10% on high voltage side, ±7% on low voltage side, withstand voltage fluctuation caused by frequent start-stop of mine loads
• Load characteristics: Adapt to heavy load, impact load and frequent start-stop load of mine fans, water pumps, roadheaders, etc., supporting long-term full load operation
• Grounding method: Special protective grounding underground (grounding resistance ≤2Ω), neutral point direct grounding/ungrounded on surface
• Executive standards: MT/T 661-2018《Mining Flameproof Mobile Substation》, GB3836《Explosion-proof Standard》, 《Coal Mine Safety Regulations》

5. Main Technical Parameters

5.1 Core Universal Parameters (Mine-specific)

• Explosion-proof grade: Exd I Mb for underground flameproof type (compliant with GB3836.1-2010), IP65+Exib I for surface general type (increased safety type)
• Protection grade: Overall cabinet IP54/IP65 (underground), IP66 (surface open-air), internal components IP23

5.2 High Voltage Side (6kV/10kV Mine Power Grid)

• Rated Voltage: 6kV, 10kV (mainstream in mines), 35kV (large surface mines)
• Rated Current: 200A/400A/630A
• Rated Short-Circuit Breaking Current: 12.5kA/16kA (underground), 20kA/25kA (surface)
• Switch Type: Mining flameproof vacuum circuit breaker/load switch (underground), mining general vacuum circuit breaker (surface), all with electric/manual operation
• Protection Function: Mining overcurrent, quick break, zero sequence, leakage interlock, overvoltage and undervoltage protection (leakage protection is mandatory underground)

5.3 Mining Dry-type Transformer Part (Mandatory Oil-free Explosion-proof Underground)

• Type: KBSG series mining flameproof dry-type transformer (underground core), SCB15 mining dry-type transformer (surface)
• Rated Capacity: 6~8% (10kV~120kV), 4%~6% (6kV~2500kVA)
• Connection Group: Dyn11/Yyn0 (mine standard, adapting to unbalanced load of mining equipment)
• Insulation Grade: H grade (mine-specific, temperature resistant to 180℃, suitable for high temperature and confined environment underground)
• Cooling Method: Natural cooling (AN) + forced air cooling (AF), suitable for underground scenarios without forced ventilation
• Noise Level: ≤65dB (noise design for underground confined environment)

5.4 Low Voltage Side (0.4kV/0.69kV/1.14kV Mine-specific)

• Rated Voltage: 0.4kV (surface), 0.69kV/1.14kV (underground mining equipment exclusive)
• Rated Current: 400A/630A/1250A/2000A
• Rated Short-Circuit Breaking Capacity: 30kA/50kA (underground), 50kA/80kA (surface)
• Switch Type: Mining flameproof molded case circuit breaker/vacuum air switch (underground), with leakage protection and overload protection
• Outgoing Circuits: 4-12 circuits (underground), 6-16 circuits (surface), customizable multi-circuit output for mobile mining sites
• Reactive Power Compensation: Mining low-voltage reactive power compensation device, compensation capacity 10~100kvar, power factor ≥0.95 (reducing mine line loss)

5.5 Mobile/Intelligent Parameters (Mine Standard Configuration)

• Structural Form: Underground skid-mounted type (with traction device, anti-vibration support legs), surface fixed/mobile trailer type
• Monitoring Function: Mining intelligent monitoring and control terminal, monitoring current, voltage, power, temperature, leakage value, data display on site
• Communication Function: Mining intrinsically safe RS485/fiber optic communication, supporting connection with mine surface and underground monitoring system (no wireless communication, adapting to underground flameproof area)
• Auxiliary Function: Built-in dehumidification, explosion-proof lighting, emergency power-off device in cabinet, rainproof and dustproof on surface

6. Performance Characteristics

• Mining explosion-proof, full safety compliance: Underground Exd I Mb explosion-proof standard, all components are mining flameproof type, no open fire and no electric spark, fundamentally eliminating gas/coal dust explosion risks; surface can be customized as flameproof type, adapting to slightly explosive areas
• Weather resistance and shock resistance, adapting to harsh mine environment: Cabinet adopts mine-specific thickened steel plate, anti-corrosion, explosion-proof, dust-proof treatment, withstanding high temperature, high humidity and multi-dust corrosion underground; skid-mounted type with anti-vibration buffer structure, withstanding vibration and impact of mine mining and transportation, extremely low failure rate
• Oil-free design, mandatory underground: Underground core KBSG series mining flameproof dry-type transformer, H-grade insulation, oil-free and maintenance-free, avoiding fire and explosion risks caused by oil leakage underground, suitable for closed and non-ventilated underground scenes
• Mobile and convenient, adapting to mine mobile operation: Underground skid-mounted structure with traction device and anti-vibration support legs, can be pulled by mine locomotives to mobile working faces and mobile mining sites, quickly connected to electricity, meeting the dynamic power distribution demand of mine surface and underground
• Complete protection, ensuring mine safety: Equipped with mine-specific high and low voltage protection devices, overcurrent, quick break, leakage protection, ensuring personal and equipment safety underground, meeting the safety requirements of coal mine safety regulations
• Compact and optimized, saving installation space: Under the premise of meeting explosion-proof requirements, minimize the volume, adapting to limited installation space in mines, optimize internal layout, and improve space utilization
• Core components are mine-specific with high reliability: All components adopt mine-specific and national standard products, transformers and monitoring terminals pass mine safety certification, stable operation, MTBF ≥15 years, adapting to complex mine operation environment
• Easy operation and maintenance, adapting to mine operation habits: The whole cabinet has flameproof and anti-corrosion design, all operation and inspection ports are mining intrinsically safe type, on-site viewing of operation parameters, simplified maintenance process
• Strong power distribution adaptability, full coverage: Supporting 6kV/10kV high-voltage incoming line, 0.4kV, 0.69kV/1.14kV low-voltage outgoing line, capacity covering 100kVA~2500kVA, meeting the power demand of all mine surface and underground equipment, supporting surface/underground/fixed/mobile power distribution with high generalization degree
• Intelligent monitoring, improving mine safety management: Equipped with mining intrinsically safe intelligent control system, real-time monitoring of key parameters such as current, voltage, temperature and leakage, remote data transmission to mine management platform, no wired communication risk, adapting to underground flameproof requirements, realizing intelligent and visualized management of mine power distribution