Mining transformers are power supply and transformation devices specifically designed for explosion-hazardous environments such as coal mines. Their specifications, models, and parameters must meet special requirements including explosion-proof performance, moisture resistance, and corrosion resistance. Here is a detailed introduction:

　　Classification and Model Meanings

　　Mining flameproof dry-type transformers:

　　Model examples: KSG-2.5/0.66, KBSG-500/6.

　　Meanings: "K" stands for mining, "S" for three-phase, and "G" for dry-type; "B" indicates flameproof; the numerical parts represent the rated capacity (kVA) and the primary-side rated voltage (kV), respectively.

　　Mining mobile substations (combined units):

　　Model example: KBSGZY-630/6.

　　Meanings: "Z" stands for combined type, and "Y" for mobile type; the numerical parts represent the capacity (kVA) and the high-voltage side voltage (kV), respectively.

　　Key Technical Parameters

　　Capacity and Voltage:

　　Capacity range: From 2.5 kVA to 3150 kVA, covering small-capacity power supplies for electric drills and lighting to long-distance power supplies for large-scale fully-mechanized mining faces.

　　Voltage levels: The primary-side voltage is mostly 6 kV or 10 kV, and the secondary-side voltage supports multi-stage adjustments, such as 400 V, 660 V, 1140 V, and 3450 V, to match different underground equipment.

　　Loss Characteristics:

　　No-load loss: Increases with capacity, e.g., 520 W for the KBSGZY-100/10 model and 5300 W for the KBSGZY-3150/10 model.

　　Load loss: Ranges from 6100 W to 12500 W, reflecting energy efficiency levels.

　　Short-circuit Impedance and No-load Current:

　　Short-circuit impedance: Ranges from 4.0% to 5.5%, affecting the transformer's ability to withstand short circuits and voltage regulation.

　　No-load current: As low as 0.7% (for models with a capacity of 1000 kVA and above), indicating low-loss core design.

　　Insulation and Cooling:

　　Insulation class: Mostly Class H or Class F, ensuring stable operation in high-temperature environments.

　　Cooling method: Air natural cooling (AN) is predominant, with some models equipped with fans to enhance cooling efficiency.

　　Protection and Certification:

　　Explosion-proof certification: Complies with the GB 3836.1-2021 standard, with explosion-proof ratings such as ExdⅠ or ExdⅠ Mb.

　　Coal mine safety certification: Passes the MA mark certification to ensure compliance with coal mine safety requirements.

　　Enclosure protection class: Mostly IP54 or IP55, suitable for humid and dusty underground environments.

　　Typical Model Parameter Table

　　Selection Recommendations

　　Select capacity based on mine scale:

　　Small mines: Prioritize the KBSGZY-100/10 or KBSGZY-500/10 models for their portability and ease of movement.

　　Large-scale fully-mechanized mining faces: Recommend the KBSGZY-2000/10 or KBSGZY-3150/10 models for their sufficient capacity and support for long-distance power supplies.

　　Match voltage levels with equipment:

　　Underground low-voltage equipment: Select models with secondary-side voltages of 1140 V or 660 V.

　　High-voltage power supply systems: Select models with primary-side voltages of 6 kV/10 kV.

　　Select explosion-proof ratings based on safety requirements:

　　High-gas environments: Confirm the transformer's explosion-proof rating (e.g., ExdⅠ Mb) to ensure compliance with safety standards.

　　Consider customizing parameters for special environments:

　　Humid and corrosive environments: Choose materials that are moisture-resistant and corrosion-resistant, and enhance enclosure protection.

　　Space-constrained environments: Select models with compact dimensions and light weight.