A mine-used current conversion mobile substation with control power supply

Abstract

The invention discloses a mine-used current conversion mobile substation with a control power supply, and relates to the technical field of mine-used power equipment. The substation includes a transformer part, a high-voltage vacuum switch box and a low-voltage protection box. The transformer part is an explosion-proof shell, and the transformer part includes a converter transformer and a control transformer. The converter transformer adopts a connection group of Dd0y11, wherein the high-voltage winding is a delta connection, and the low-voltage winding is a star connection and a delta connection respectively; the coil of the low-voltage winding is composed of two wire packages, the upper half of the wire package adopts a Y-shaped connection method, and the lower half of the wire package adopts a D-shaped connection method, the phase angle of the voltage is 30° different from each other, the number of layers of the two wire packages are both even, and a pad is set between the upper and lower half of the wire packages; a high-voltage segment adjustment device is also set at the high-voltage winding of the converter transformer. The control transformer adopts 20KVA, adopts a three-phase four-wire connection mode, and the high-voltage part and the low-voltage part are both star-connected. The present invention meets the complex working environment underground, reduces the space occupied by the equipment underground, and facilitates the transportation and installation of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of mining power equipment, in particular to a mining current conversion mobile substation with a control power supply. Background Art

[0002] The explosion-proof mobile substation for mining is a high-tech, energy-saving, green and environmentally friendly product that supports multiple rectification, unit series connection, multi-level, and phase-shift inverter main circuit topology. It can promote and realize low harmonic or even harmonic-free frequency conversion speed regulation of high-voltage series ordinary AC asynchronous motors, and can solve the harmonic pollution problem in high-voltage frequency conversion applications from the source. Generally, the explosion-proof mobile substation for mining should be used in conjunction with the inverter, and the control circuit of the inverter requires power supply, and its voltage is generally around 380V. At the same time, the main circuit of the mobile substation, inverter and load is a separate circuit system from the control circuit of the inverter, and should not interfere with each other; in addition, the working environment is quite special. Compared with the ground, the use environment of electrical equipment in coal mines is essentially different. The most important difference is that coal mines usually contain explosive gases such as gas, and the electrical equipment used in coal mines needs to have explosion-proof performance, that is, the explosion inside the equipment cannot ignite the flammable substances outside the equipment. However, the space underground in coal mines is usually limited, and the size and number of equipment should also be considered. Therefore, considering the above conditions, it is necessary to improve the existing mine-used mobile substation. Summary of the invention

[0003] The present invention provides a mine-used current conversion mobile substation with a control power supply in order to solve the problem that when a mine-used flameproof current conversion mobile substation is used in conjunction with a frequency converter, the frequency converter requires a control power supply, occupies a large space when working, and cannot ensure full flameproof.

[0004] The present invention is realized through the following technical scheme: a mine-used current conversion mobile substation with a control power supply, comprising a transformer part, a high-voltage vacuum switch box and a low-voltage protection box, the outside of the transformer part is an explosion-proof shell, and the transformer part comprises a dry-type transformer for a mine-used flameproof current conversion mobile substation and a dry-type transformer for a control power supply. Two B5 pressure plate type introduction devices and four A4 compression nut type introduction devices are arranged on the side of the high-voltage vacuum switch box, and a closing command module, an opening command module, a fault opening module, an emergency stop module and a ready signal module, a closing feedback output module, an opening feedback output module and a fault opening output module are arranged inside; one of the B5 pressure plate type introduction devices is connected to the isolating switch through a terminal post, and is divided into two paths after the isolating switch, one path is connected to the terminal post of the dry-type transformer for mine flameproof type converter mobile substation through a vacuum circuit breaker, and the other path is connected to the terminal post of the dry-type transformer for control power supply through a high-voltage fast-fuse coil; the low-voltage side of the dry-type transformer for mine flameproof type converter mobile substation is connected to the low-voltage protection box through a terminal post, and is led out through two pairs of B5 pressure plate type introduction devices, the low-voltage side of the dry-type transformer for control power supply is also connected to the low-voltage protection box through a terminal post, and is led out through three A5 pressure plate type introduction devices, and four A4 compression nut type introduction devices are also arranged on the side wall of the low-voltage protection box. The dry-type transformer for the mine explosion-proof mobile substation adopts the connection group of Dd0y11, in which the high-voltage winding is delta-connected, and the low-voltage winding is star-connected and delta-connected respectively; a shielding grounding layer is provided between the high-voltage winding and the low-voltage winding, and the shielding grounding layer is composed of a vertically distributed metal film on the surface of the cylindrical insulation layer between the primary winding and the secondary winding; the core silicon steel sheets of the high-voltage winding and the low-voltage winding adopt high magnetic induction oriented silicon steel sheets and multi-stage step-type full-bevel joint lamination structure, and the core of the high-voltage winding and the low-voltage winding adopts The hole-free binding method is adopted, and the cut of the iron core sheet is coated with anti-rust liquid, and the surface of the iron core column and the lower iron yoke is coated with high-temperature resistant anti-rust and moisture-proof paint; the clamps of the high-voltage winding and the low-voltage winding adopt a channel steel structure, and the upper and lower tightening adopts a pull screw structure; the coil of the low-voltage winding is composed of two wire packages, the upper wire package adopts a Y-shaped connection method, and the lower wire package adopts a D-shaped connection method. The phase angle of the voltage is 30° different from each other, and the number of layers of the two wire packages is an even number of layers; the high-voltage winding of the dry-type transformer 5 for the mine flameproof type current conversion mobile substation is also provided with a high-voltage segment adjustment device. The dry-type transformer for the control power supply adopts 20KVA, adopts a three-phase four-wire wiring mode, and the high-voltage part and the low-voltage part are both corner-connected. An explosion-proof joint surface is provided between the transformer part and the high-voltage vacuum switch box, an explosion-proof joint surface is also provided on the explosion-proof shell, and an explosion-proof joint surface is also provided on the outer side of the corresponding position of the dry-type transformer for the control power supply and the explosion-proof shell; an explosion-proof joint surface is also provided between the transformer part and the low-voltage protection box.

[0005] The mine-used current conversion mobile substation with control power provided by the present invention mainly solves the heat dissipation of low-voltage wire packages and makes the dry-type transformer for control power supply (hereinafter referred to as control transformer) and the dry-type transformer for mine-used flameproof current conversion mobile substation (hereinafter referred to as converter transformer) work together and are explosion-proof together, saving space and having a large number of advantages. The present invention mainly includes a transformer part, a high-voltage vacuum switch box and a low-voltage protection box. The outside of the transformer part is an explosion-proof shell. The transformer part includes a converter transformer and a control transformer. The two transformers are integrated in the same explosion-proof shell to form a whole. The bodies and high and low voltage leads of the two transformers meet the electrical performance gap between each other, and there is no mutual interference between the supply and distribution circuits of the two transformers. Two B5 pressure plate type introduction devices and four A4 compression nut type introduction devices are arranged on the side of the high-voltage vacuum switch box for introducing power lines. A closing command module, an opening command module, a fault opening module, an emergency stop module, a ready signal module, a closing feedback output module, an opening feedback output module and a fault opening output module are arranged inside the high-voltage vacuum switch box; one of the B5 pressure plate type introduction devices is connected to the isolating switch through a terminal post, and is divided into two paths after the isolating switch, one path is connected to the terminal post of the converter transformer through the vacuum circuit breaker, and the other path is connected to the terminal post of the control transformer through the high-voltage fast-fuse coil; the low-voltage side of the converter transformer is connected to the low-voltage protection box through the terminal post, and is led out through two pairs of B5 pressure plate type introduction devices, the low-voltage side of the control transformer is also connected to the low-voltage protection box through the terminal post, and is led out through three A5 pressure plate type introduction devices, and four A4 compression nut type introduction devices are also arranged on the side wall of the low-voltage protection box. The converter transformer adopts the connection group of Dd0y11, in which the high-voltage winding is delta-connected, and the low-voltage winding is star-connected and delta-connected respectively. This connection form can well suppress high-order harmonics and improve voltage quality. A shielding grounding layer is provided between the high-voltage winding and the low-voltage winding. The shielding grounding layer is composed of a vertically distributed metal film on the surface of the cylindrical insulation layer between the primary winding and the secondary winding. This is to eliminate the capacitive coupling between the primary side and the secondary side; the core silicon steel sheets of the high-voltage winding and the low-voltage winding adopt high magnetic induction oriented silicon steel sheets and multi-stage step-type full-bevel joint lamination structure, which has high magnetic flux capacity. At the same time, the magnetic flux density B is designed to take a low value, which can prevent the magnetic saturation of the core from affecting the frequency conversion effect. The core is tied without holes to reduce the no-load current and loss of the core. The core of the high-voltage winding and the low-voltage winding adopts a hole-free binding method, the cut of the iron sheet is coated with anti-rust liquid, and the surface of the core column and the lower iron yoke is coated with high-temperature rust-proof and moisture-proof paint, all for moisture-proof and rust-proof, and prolonging the service life. The clamps of high-voltage winding and low-voltage winding adopt channel steel structure, and the upper and lower tensioning adopts the tension screw structure. Measures need to be taken to prevent the iron core and the clamps from relative displacement to avoid affecting the product quality. The iron core insulation adopts domestic high-quality C-class insulation material; the main longitudinal insulation adopts domestic high-quality C-class insulation material; the high and low voltage coils adopt tight winding and vacuum pressure varnishing process to improve the mechanical strength of the coils.The coil of the low-voltage winding is composed of two wire packages. The upper wire package adopts Y-shaped connection, and the lower wire package adopts D-shaped connection. The phase angle of the voltage is 30° different from each other. The number of layers of the two wire packages is an even number, which makes it easy to get out the low voltage. The high-voltage winding of the dry-type transformer used in the mine explosion-proof mobile substation is also equipped with a high-voltage segment adjustment device. The control transformer adopts 20KVA and adopts a three-phase four-wire connection mode. Both the high-voltage part and the low-voltage part are star-connected; because the control power supply can be manually sent and cut off in the low-voltage side protection box, and one side must output 380V power before the high-voltage side can be closed, and after the 380V control power supply is disconnected, the high-voltage side must trip. It serves as the power supply for the inverter control circuit and charges the internal capacitor. It belongs to non-stop power supply and long-term power supply. An explosion-proof joint surface is arranged between the transformer part and the high-voltage vacuum switch box, an explosion-proof joint surface is also arranged on the explosion-proof shell, and an explosion-proof joint surface is also arranged on the outside of the corresponding position of the control transformer and the explosion-proof shell; an explosion-proof joint surface is also arranged between the transformer part and the low-voltage protection box.

[0006] Preferably, the high-voltage and low-voltage winding coils of the dry-type transformer for the mine flameproof mobile substation adopt a tight winding and vacuum pressure varnishing process, and use Nomex paper-wrapped oxygen-free copper wire with C-class insulation. The dielectric constant of Nomex paper is very close to that of air, the electric field around the coil is uniform, and the local discharge is small; the coil insulation is reliable, has good heat resistance and electrical properties, and can operate at high temperature for a long time; the coil is vacuum-impregnated, and has good mechanical strength and moisture resistance.

[0007] Preferably, an insulating partition is provided between the dry-type transformer for the mine flameproof mobile substation and the dry-type transformer for the control power supply; it can well enhance the insulation strength between the two transformers and avoid mutual interference between the leads of the two transformers.

[0008] Preferably, the dry-type transformer for control power supply is located at the lower side of the dry-type transformer for mine flameproof mobile substation, and is placed vertically with the high-voltage side facing the explosion-proof shell; such a layout is conducive to the lead-out of the auxiliary transformer high-voltage lead to meet its higher electrical performance, while avoiding mutual interference with the high-voltage lead of the converter transformer; secondly, the auxiliary transformer has a low voltage on the low-voltage side and low electrical performance requirements, and silicone wire can be used to connect to the low-voltage terminal at a long distance on the inner wall of the shell to avoid safety hazards such as creepage with the converter transformer body and shell; thirdly, there is a large gap under the high-voltage side of the converter transformer, and this part of the space can be fully utilized by the auxiliary transformer, and the electrical clearance can also be well met, thereby reducing production costs.

[0009] Preferably, the high-voltage lead wires of the dry-type transformer for the mine flameproof mobile substation are led out in a D-connection mode, and the head and tail are connected in an AZ, BX, and CY manner.

[0010] Preferably, the high-voltage segmented regulating device is arranged on the high-voltage winding of the dry-type transformer 5 for the mine-used flameproof mobile substation. On the one hand, since the converter transformer has more high-voltage taps, its flange will be correspondingly larger, and the upper cover space is larger, which can be welded and matched, and it is indeed convenient for the mine's high-voltage tap transformation operation; on the other hand, due to its high voltage, the electrical clearance requirement is high, and the space here is large and can meet it. In addition, it is also conducive to the arrangement of high-voltage leads to avoid mutual interference between high-voltage tap lines.

[0011] Preferably, the low-voltage side of the dry-type transformer for the mine flameproof mobile substation is provided with 6 lead-out flexible connecting wires, which are distributed as 3 on the top and 3 on the bottom. Such an arrangement can not only meet the electrical clearance between the leads, but also has a reasonable layout, is easy to identify, and is convenient for construction and operation.

[0012] Preferably, a 10mm thick pad is provided between the upper coil and the lower coil of the low-voltage winding. The pad is distributed in 12 equal parts along the circumference, and one end of the pad is clamped on the dovetail support bar. The pad is made of DMC. The pad will not deviate or loosen even when subjected to external force, which increases the mechanical strength and increases the airflow channel between the upper and lower coils, so that the hot air of the lower coil is dissipated through the airway between the pads, thereby increasing the heat dissipation effect of the low-voltage coil. According to test comparison, the temperature rise of the coil can be reduced by 4-5K.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the mining-use mobile substation with a control power supply provided by the present invention can, on the one hand, well realize power supply to the inverter control circuit, meet the normal use of the inverter and the detection and debugging needs before use, and the power on and off of the main circuit and the control circuit do not affect each other, thereby achieving good functional effects; on the other hand, due to the integrity and safety of the explosion-proof shell, it meets the complex working environment underground, reduces the space occupied by the equipment underground, facilitates the transportation and installation of the equipment, reduces the production cost and the workload of daily maintenance of the equipment, and this design has the effects of convenient maintenance, safety and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the overall structure of the present invention.

[0015] Figure 2 It is a top view of the overall structure of the present invention.

[0016] Figure 3 It is a circuit schematic diagram of the present invention.

[0017] Figure 4 It is a schematic diagram of the grounding shielding layer of the one side winding and the secondary winding of the present invention.

[0018] Figure 5It is a schematic front view of the structure of the upper half coil package, the lower half coil package and the cushion block of the low-voltage coil of the present invention.

[0019] Figure 6 The schematic diagram of the structure of the upper half coil package and the lower half coil package and the cushion block of the low voltage coil of the present invention is shown in the top view

[0020] Figure 7 This is a schematic diagram of high-voltage side wiring of the present invention.

[0021] Figure 8 Schematic diagram of low voltage side wiring of the present invention, wherein a1, b1, c1 are Y (star connection); a2, b2, c2 are △ (delta connection).

[0022] The markings in the figure are as follows: 1-transformer part, 2-high-voltage vacuum switch box, 3-low-voltage protection box, 4-dry-type transformer for control power supply, 5-dry-type transformer for mine flameproof mobile substation, 6-explosion-proof joint surface, 7-explosion-proof shell, 8-secondary winding, 9-primary winding, 10-shielding grounding layer, 11-transformer support, 12-transformer yoke, 13-skeleton, 14-dovetail support, 15-Y wiring package protrusion, 16-pad, 17-Y low-voltage wire package, 18-D low-voltage wire package, 19-D wiring package protrusion, 20-high-voltage wiring chamber, 21-low-voltage wiring chamber. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with specific embodiments.

[0024] A mine-used current conversion mobile substation with a control power supply, such as Figure 1 to Figure 6As shown: it includes a transformer part 1, a high-voltage vacuum switch box 2 and a low-voltage protection box 3. The transformer part 1 is externally an explosion-proof shell 7. The transformer part 1 includes a dry-type transformer 5 for a mine flameproof current conversion mobile substation and a dry-type transformer 4 for a control power supply; two B5 pressure plate type lead-in devices and four A4 compression nut type lead-in devices are arranged on the side of the high-voltage vacuum switch box 2, and a closing command module, an opening command module, a fault opening module, an emergency stop module and a ready signal module, a closing feedback output module, an opening feedback output module and a fault opening output module are arranged inside; one of the B5 pressure plate type lead-in devices is connected to the isolating switch through a terminal, and is divided into two paths from the isolating switch, one path is through a vacuum The circuit breaker is connected to the terminal of the dry-type transformer 5 for mine flameproof mobile current conversion substation, and the other way is connected to the terminal of the dry-type transformer 4 for control power supply through a high-voltage fast-fuse coil; the low-voltage side of the dry-type transformer 5 for mine flameproof mobile current conversion substation is connected to the low-voltage protection box 3 through the terminal, and is led out through two pairs of B5 pressure plate type introduction devices, and the low-voltage side of the control power supply dry-type transformer 4 is also connected to the low-voltage protection box 3 through the terminal, and is led out through three A5 pressure plate type introduction devices, and four A4 compression nut type introduction devices are also provided on the side wall of the low-voltage protection box 3; the dry-type transformer 5 for mine flameproof mobile current conversion substation adopts the connection group of Dd0y11, in which the high-voltage winding is Corner connection, star connection and corner connection for low voltage winding respectively; a shielding grounding layer 10 is arranged between the high voltage winding and the low voltage winding, and the shielding grounding layer is composed of a vertically distributed metal film on the surface of the cylindrical insulating layer between the primary winding 9 and the secondary winding 8; the core silicon steel sheets of the high voltage winding and the low voltage winding adopt high magnetic induction oriented silicon steel sheets and a multi-stage step-type full-bevel joint lamination structure, the core of the high voltage winding and the low voltage winding adopts a hole-free binding method, and the cut of the iron sheet is coated with anti-rust liquid, and the surface of the core column and the lower iron yoke is coated with high temperature resistant anti-rust and moisture-proof paint; the clamps of the high voltage winding and the low voltage winding adopt a channel steel structure, and the upper and lower tightening adopts a pull screw structure; the coil of the low voltage winding consists of two wire packages, and the upper half of the wire package adopts a Y-shaped Connection method, the lower half of the wire package adopts D-type connection, the phase angle of the voltage differs by 30°, and the number of layers of the two wire packages is an even number; the high-voltage winding of the dry-type transformer 5 for mine flameproof current conversion mobile substation is also provided with a high-voltage section adjustment device; the control power supply dry-type transformer 4 adopts 20KVA, adopts a three-phase four-wire connection mode, and the high-voltage part and the low-voltage part are both star-connected; an explosion-proof joint surface 6 is provided between the transformer part 1 and the high-voltage vacuum switch box 2, an explosion-proof joint surface 6 is also provided on the explosion-proof shell 7, and an explosion-proof joint surface 6 is also provided on the outside of the corresponding position of the control power supply dry-type transformer 4 and the explosion-proof shell 7; an explosion-proof joint surface 6 is also provided between the transformer part 1 and the low-voltage protection box 3.

[0025] The preferred solution is adopted in this embodiment: the high-voltage and low-voltage winding coils of the dry-type transformer 5 for mine flameproof current conversion mobile substation adopt tight winding and vacuum pressure varnishing process, and adopt Nomex paper-wrapped oxygen-free copper wire with C-class insulation; an insulating partition is arranged between the dry-type transformer 5 for mine flameproof current conversion mobile substation and the dry-type transformer 4 for control power supply; the dry-type transformer 4 for control power supply is located at the lower side of the dry-type transformer 5 for mine flameproof current conversion mobile substation, and is placed vertically, with the high-voltage side facing the explosion-proof housing 7; the dry-type transformer 5 for mine flameproof current conversion mobile substation The high-voltage lead wire is led out in D connection mode, and the head and tail are connected in AZ, BX, and CY mode; the high-voltage segmented regulating device is arranged on the high-voltage winding of the dry-type transformer 5 for mine flameproof current conversion mobile substation, and the low-voltage side of the dry-type transformer 5 for mine flameproof current conversion mobile substation is provided with 6 lead-out soft connecting wires, and are distributed as 3 on the top and 3 on the bottom; a 10mm thick pad 16 is arranged between the upper half wire package and the lower half wire package of the coil of the low-voltage winding, and the pad 16 is equally distributed along the circumference 12, and one end of the pad is clamped on the dovetail support bar, and the pad material is DMC.

[0026] In this embodiment, the high / low voltage side wiring is as follows Figure 7~Figure 8 The specific operation is: put the transformer part 1, high-voltage vacuum switch box 2, low-voltage protection box 3 and explosion-proof shell 7 into place. Figure 1 Assemble it, connect the wires separately, and finally put it into use.

[0027] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mine-used current conversion mobile substation with a control power supply, characterized in that: It comprises a transformer part (1), a high-voltage vacuum switch box (2) and a low-voltage protection box (3); the transformer part (1) has an explosion-proof housing (7) on the outside; the transformer part (1) comprises a dry-type transformer (5) for a mine-use flameproof current conversion mobile substation and a dry-type transformer (4) for a control power supply; The high-voltage vacuum switch box (2) is provided with two B5 pressure plate type lead-in devices and four A4 compression nut type lead-in devices on the side thereof, and is provided with a closing command module, an opening command module, a fault opening module, an emergency stop module, a ready signal module, a closing feedback output module, an opening feedback output module and a fault opening output module inside; one of the B5 pressure plate type lead-in devices is connected to the isolating switch via a terminal post, and is divided into two paths after the isolating switch, one of which is connected to the terminal post of the dry-type transformer (5) for mine flameproof current conversion mobile substation via a vacuum circuit breaker. The low-voltage side of the dry-type transformer (5) for the mine flameproof current conversion mobile substation is connected to the low-voltage protection box (3) through the terminal and is led out through two pairs of B5 pressure plate type lead-in devices. The low-voltage side of the dry-type transformer (4) for the control power supply is also connected to the low-voltage protection box (3) through the terminal and is led out through three A5 pressure plate type lead-in devices. Four A4 compression nut type lead-in devices are also provided on the side wall of the low-voltage protection box (3); The dry-type transformer (5) for a mine flameproof current conversion mobile substation adopts a connection group of Dd0y11, wherein the high-voltage winding is delta-connected, and the low-voltage winding is star-connected and delta-connected respectively; a shielding grounding layer (10) is provided between the high-voltage winding and the low-voltage winding, and the shielding grounding layer is composed of a vertically distributed metal film on the surface of a cylindrical insulating layer between the primary winding (9) and the secondary winding (8); the core silicon steel sheets of the high-voltage winding and the low-voltage winding adopt a high magnetic induction oriented silicon steel sheet and a multi-stage step-type full-bevel joint lamination structure, and the high-voltage winding and the low-voltage winding are The core of the group is tied in a hole-free manner, and the cut of the core sheet is coated with anti-rust liquid, and the surface of the core column and the lower iron yoke is coated with high-temperature resistant anti-rust and moisture-proof paint; the clamps of the high-voltage winding and the low-voltage winding are of channel steel structure, and the upper and lower tightening adopts a tension screw structure; the coil of the low-voltage winding is composed of two wire packages, the upper wire package adopts a Y-shaped connection method, and the lower wire package adopts a D-shaped connection method, the phase angles of the voltages differ by 30°, and the number of layers of the two wire packages is an even number; the high-voltage winding of the dry-type transformer (5) for mining flameproof current conversion mobile substation is also provided with a high-voltage segment adjustment device; The control power supply dry-type transformer (4) is 20KVA and adopts a three-phase four-wire connection mode, with both the high-voltage part and the low-voltage part being star-connected; An explosion-proof joint surface (6) is provided between the transformer part (1) and the high-voltage vacuum switch box (2), an explosion-proof joint surface (6) is also provided on the explosion-proof housing (7), and an explosion-proof joint surface (6) is also provided on the outer side of the corresponding position of the control power supply dry-type transformer (4) and the explosion-proof housing (7); an explosion-proof joint surface (6) is also provided between the transformer part (1) and the low-voltage protection box (3); The high-voltage and low-voltage winding coils of the dry-type transformer (5) for the mine flameproof current conversion mobile substation are tightly wound and vacuum pressure impregnated with paint, and use Nomex paper-wrapped oxygen-free copper wires with C-class insulation; An insulating partition is provided between the dry-type transformer (5) for the mine flameproof current conversion mobile substation and the dry-type transformer (4) for the control power supply; The control power supply dry-type transformer (4) is located below the side of the mine flameproof current conversion mobile substation dry-type transformer (5) and is placed vertically with the high-voltage side facing the explosion-proof housing (7); The high voltage lead wire of the dry-type transformer (5) for the mine flameproof mobile substation adopts the D connection method, and the head and tail adopt the AZ, BX, CY connection method; The high-voltage segmented regulating device is arranged on the upper part of the high-voltage winding of the dry-type transformer (5) for a mine flameproof current conversion mobile substation.

2. A mine-used current conversion mobile substation with a control power supply according to claim 1, characterized in that: The low-voltage side of the dry-type transformer (5) for a mine flameproof current conversion mobile substation is provided with 6 lead-out flexible connecting wires, which are distributed as 3 on the upper side and 3 on the lower side.

3. A mine-used current conversion mobile substation with a control power supply according to claim 1, characterized in that: A 10 mm thick pad (16) is provided between the upper coil and the lower coil of the low voltage winding, the pad (16) being distributed in 12 equal parts along the circumference, and one end of the pad is clamped on the dovetail support bar, and the pad is made of DMC.

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