CN113036650A - Mining variable-current mobile substation with control power supply - Google Patents
Mining variable-current mobile substation with control power supply Download PDFInfo
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- CN113036650A CN113036650A CN202110443437.2A CN202110443437A CN113036650A CN 113036650 A CN113036650 A CN 113036650A CN 202110443437 A CN202110443437 A CN 202110443437A CN 113036650 A CN113036650 A CN 113036650A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B7/00—Enclosed substations, e.g. compact substations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/52—Mobile units, e.g. for work sites
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
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- Engineering & Computer Science (AREA)
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- Housings And Mounting Of Transformers (AREA)
Abstract
The invention discloses a mining variable-current mobile substation with a control power supply, and relates to the technical field of mining power equipment. The transformer substation comprises a transformer part, a high-voltage vacuum switch box and a low-voltage protection box, wherein an explosion-proof shell is arranged outside the transformer part, and the transformer part comprises a converter transformer and a control transformer. The converter transformer adopts a Dd0y11 connection group, wherein a high-voltage winding is in angular connection, and a low-voltage winding is in star connection and angular connection respectively; the coil of the low-voltage winding is composed of two coils, the upper half coil adopts a Y-shaped connection method, the lower half coil adopts a D-shaped connection method, the phase angles of the voltages are different by 30 degrees, the number of the two coils is even, and a cushion block is arranged between the upper half coil and the lower half coil; and a high-voltage section adjusting device is also arranged at the high-voltage winding of the converter transformer. The control transformer adopts 20KVA, adopts a three-phase four-wire system wiring mode, and the high-voltage part and the low-voltage part are all star-connected. The underground complex working environment is met, the underground occupied space of the equipment is reduced, and the equipment is convenient to transport and install.
Description
Technical Field
The invention relates to the technical field of mining electric equipment, in particular to a mining variable-current mobile substation with a control power supply.
Background
The mining explosion-proof type current transformation mobile substation is a high-technical-performance, energy-saving and environment-friendly product, supports a main circuit topological structure of a multi-rectification, unit series, multi-level and phase-shifting type frequency converter, can promote and realize low-harmonic and even harmonic-free frequency conversion speed regulation of a high-voltage series common alternating-current asynchronous motor, and can solve the problem of harmonic pollution in high-voltage frequency conversion application from the source. The general mining explosion-proof type variable current mobile substation is used together with a frequency converter, a control loop of the frequency converter needs power supply, the voltage of the frequency converter is about 380V generally, and meanwhile, a main circuit of the variable current mobile substation, the frequency converter and a load and the control loop of the frequency converter are separated circuit systems and should not interfere with each other; in addition, the working environment is special, and compared with the ground, the underground coal mine has essential differences in the use environment of the electrical equipment, the most important difference is that the underground coal mine usually contains gas and other explosive gases, and the electrical equipment used in the underground coal mine needs to have explosion-proof performance, namely, the explosion inside the equipment can not ignite inflammable substances outside the equipment. In the coal mine, the space is usually limited, and the external dimension and the number of equipment are generally considered, so that the existing mining variable-flow mobile substation needs to be improved in consideration of the situations.
Disclosure of Invention
The invention provides a mining variable-current mobile substation with a control power supply, and aims to solve the problems that when a mining explosion-proof variable-current mobile substation is matched with a frequency converter for use, the frequency converter needs the control power supply, the occupied space is large during working, and full explosion-proof cannot be guaranteed.
The invention is realized by the following technical scheme: the mining variable-current mobile substation with the control power supply comprises a transformer part, a high-voltage vacuum switch box and a low-voltage protection box, wherein an explosion-proof shell is arranged outside the transformer part, and the transformer part comprises a dry-type transformer for the mining explosion-proof variable-current mobile substation and a dry-type transformer for the control power supply. The side surface of the high-pressure vacuum switch box is provided with two B5 pressure plate type leading-in devices and four A4 pressure nut type leading-in devices, and 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 in the high-pressure vacuum switch box; one B5 pressure plate type leading-in device is connected with an isolating switch through a binding post and is divided into two paths from the rear of the isolating switch, one path is connected with the binding post of the dry type transformer for the mining explosion-proof type variable current mobile transformer station through a vacuum circuit breaker, and the other path is connected with the binding post of the dry type transformer for the control power supply through a high-voltage fast-melting coil; the low-voltage side of the dry type transformer for the mining explosion-proof type current transformation mobile substation is connected with a low-voltage protection box through a binding post and is led out through two pairs of B5 pressure plate type leading-in devices, the low-voltage side of the dry type transformer for the control power supply is also connected with the low-voltage protection box through the binding post and is led out through three A5 pressure plate type leading-in devices, and four A4 pressure nut type leading-in devices are further arranged on the side wall of the low-voltage protection box. The dry-type transformer for the mining explosion-proof type current transformation mobile substation adopts a Dd0y11 connection group, wherein a high-voltage winding is in angular connection, and a low-voltage winding is in star connection and angular connection respectively; a shielding grounding layer is arranged between the high-voltage winding and the low-voltage winding and is formed by a metal film which is vertically distributed on the surface of a cylindrical insulating layer between the primary winding and the secondary winding; the iron 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 stepping full-inclined seam laminated structure, the iron cores of the high-voltage winding and the low-voltage winding adopt a non-porous binding mode, the cut of an iron core sheet is coated with antirust liquid, and the surfaces of an iron core column and a lower iron yoke are coated with high-temperature-resistant antirust moisture-proof paint; the clamping pieces of the high-voltage winding and the low-voltage winding adopt a channel steel structure, and a pull screw structure is adopted for vertical tensioning; the coil of the low-voltage winding consists of two coils, the upper half coil adopts a Y-shaped connection method, the lower half coil adopts a D-shaped connection method, the phase angles of the voltages are different by 30 degrees, and the number of the two coils is even; and a high-voltage section adjusting device is also arranged at the high-voltage winding of the dry type transformer 5 for the mining explosion-proof type current transformation mobile substation. The dry type transformer for the control power supply adopts 20KVA and a three-phase four-wire system wiring mode, and a high-voltage part and a low-voltage part are in angle connection. 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 outside the position of the dry type transformer for the control power supply, which corresponds to the explosion-proof shell; an explosion-proof joint surface is also arranged between the transformer part and the low-voltage protection box.
The mining variable-current mobile substation with the control power supply mainly solves the problem of heat dissipation of a low-voltage coil and integrates a dry-type transformer (hereinafter referred to as a control transformer) for the control power supply and a dry-type transformer (hereinafter referred to as a variable-current transformer) for a mining explosion-proof variable-current mobile substation into a whole, works together and is explosion-proof together, saves space and has a great number of advantages. The transformer mainly comprises a transformer part, a high-voltage vacuum switch box and a low-voltage protection box, wherein an explosion-proof shell is arranged outside the transformer part, the transformer part comprises a converter transformer and a control transformer, the two transformers are integrated in the same explosion-proof shell to form a whole, the bodies of the two transformers and high-voltage and low-voltage leads meet the electrical performance gap, and the supply and distribution circuits of the two transformers do not interfere with each other. The side surface of the high-pressure vacuum switch box is provided with two B5 pressure plate type leading-in devices and four A4 pressure nut type leading-in devices for leading in a power supply circuit, and a closing command module, a switching-off command module, a fault switching-off module, an emergency stop module, a ready signal module, a closing feedback output module, a switching-off feedback output module and a fault switching-off output module are arranged in the high-pressure vacuum switch box; one B5 pressure plate type leading-in device is connected with a disconnecting switch through a binding post and is divided into two paths from the rear of the disconnecting switch, one path is connected with the binding post of a converter transformer through a vacuum circuit breaker, and the other path is connected with the binding post of a control transformer through a high-voltage fast-melting coil; the low-voltage side of the converter transformer is connected with a low-voltage protection box through a binding post and is led out through two pairs of B5 pressure plate type leading-in devices, the low-voltage side of the control transformer is also connected with the low-voltage protection box through the binding post and is led out through three A5 pressure plate type leading-in devices, and four A4 pressure nut type leading-in devices are further arranged on the side wall of the low-voltage protection box. The converter transformer adopts a Dd0y11 connection group, wherein a high-voltage winding is in angular connection, and a low-voltage winding is in star connection and angular connection respectively, and the connection form can well inhibit higher harmonics and improve the voltage quality. A shielding grounding layer is arranged between the high-voltage winding and the low-voltage winding, and the shielding grounding layer is formed by a metal film which is vertically distributed on the surface of a cylindrical insulating layer between the primary winding and the secondary winding and is used for eliminating the capacitive coupling between the primary side and the secondary side; the iron 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 stepping full-oblique seam laminated structure, so that the iron core has high magnetic flux capacity, the magnetic flux density B is designed to be low, the frequency conversion effect can be prevented from being influenced by iron core magnetic saturation, and the no-hole binding mode of the iron core reduces the no-load current and loss of the iron core. The iron cores of the high-voltage winding and the low-voltage winding adopt a hole-free binding mode, the notch of the iron core piece is coated with antirust liquid, and the surfaces of the iron core column and the lower iron yoke are coated with high-temperature-resistant antirust moisture-proof paint, so that the moisture-proof and rust-proof effects are achieved, and the service life is prolonged. The clamping pieces of the high-voltage winding and the low-voltage winding are of channel steel structures, the upper part and the lower part of the clamping pieces are tensioned to adopt pull screw rod structures, and measures are needed to prevent relative displacement of the iron core and the clamping pieces so as to avoid influencing product quality. The iron core insulating part is made of a domestic high-quality C-grade insulating material; the main longitudinal insulation adopts a domestic high-quality C-grade insulation material; the high-low voltage coil adopts the processes of tightly winding and vacuum pressure paint dipping, so that the mechanical strength of the coil is improved. The coil of the low-voltage winding is composed of two coils, the upper half coil is connected in a Y shape, the lower half coil is connected in a D shape, the phase angle of voltage is 30 degrees, the number of the two coils is even, and the number of the coils is even, so that the low-voltage tapping can be facilitated. The high-voltage winding of the dry type transformer for the mining explosion-proof type current transformation mobile substation is also provided with a high-voltage section adjusting device. The control transformer adopts 20KVA, a three-phase four-wire system wiring mode is adopted, and a high-voltage part and a low-voltage part are all star-connected; the control power supply can carry out manual power supply and power off operation on the low-voltage side protection box, high-voltage side switching-on can be carried out only after 380V power supply is output, and the high-voltage side tripping operation is carried out after the 380V control power supply is disconnected, so that the high-voltage side tripping operation is used as a frequency converter control loop to serve as a power supply and also charges an internal capacitor, and the power supply is in non-stop power supply and long-term power supply. An explosion-proof joint face is arranged between the transformer part and the high-voltage vacuum switch box, an explosion-proof joint face is also arranged on the explosion-proof shell, and an explosion-proof joint face is also arranged outside the position of the control transformer corresponding to the explosion-proof shell; an explosion-proof joint surface is also arranged between the transformer part and the low-voltage protection box.
Preferably, the high-voltage and low-voltage winding coil of the dry type transformer for the mining explosion-proof type current transformation mobile substation adopts a tightly winding and vacuum pressure paint dipping process, and a C-level insulated Nomex paper is used for wrapping an oxygen-free copper wire, the dielectric constant of the Nomex paper is very close to that of air, the electric field around the coil is uniform, and the partial discharge is small; the coil is reliable in insulation, has better heat resistance and electrical performance, and can operate at high temperature for a long time; the coil adopts vacuum dip coating, and has better mechanical strength and moisture resistance.
Preferably, an insulating partition plate is arranged between the dry-type transformer for the mining explosion-proof type current transformation mobile substation and the dry-type transformer for the control power supply; the transformer can well enhance the insulation strength between two transformers and simultaneously avoid the mutual interference of the leads of the two transformers.
Preferably, the dry-type transformer for the control power supply is positioned below the side of the dry-type transformer for the mining explosion-proof type variable current mobile substation and is longitudinally arranged, and the high-voltage side faces the explosion-proof shell; the layout is beneficial to the auxiliary leading-out of the high-voltage lead, the high electrical performance of the lead is met, and the mutual interference with the high-voltage lead of the converter transformer is avoided; the auxiliary transformer low-voltage side voltage is low, the electrical performance requirement is low, a silica gel wire can be selected to be connected to the low-voltage wiring terminal on the inner wall of the shell in a long distance, and potential safety hazards such as creepage and the like between the transformer body and the shell of the converter transformer are avoided; thirdly, a larger gap is arranged below the high-voltage side of the converter transformer, the space can be fully utilized by auxiliary transformation, and the electrical gap can be well met, so that the production cost is reduced.
Preferably, a high-voltage lead of the dry-type transformer for the mining explosion-proof type transformer mobile substation is led out in a D connection mode, and the head and the tail of the dry-type transformer are connected in an A-Z, B-X, C-Y connection mode.
Preferably, the high-voltage section adjusting device is arranged above a high-voltage winding of the dry type transformer 5 for the mine explosion-proof type transformer mobile substation, on one hand, because the number of high-voltage taps of the transformer is large, the flange of the transformer is correspondingly large, the space of the upper cover is large, the transformer can be welded and matched, and the operation of mine high-voltage tapping transformation is really facilitated; on the other hand, the voltage is higher, the requirement on the electric gap is higher, and the space at the position is larger, so that the requirements can be met, the arrangement of high-voltage leads is facilitated, and the mutual interference of high-voltage branch lines is avoided.
Preferably, the low-voltage side of the dry-type transformer for the mining explosion-proof type current transformation mobile substation is provided with 6 leading-out flexible connecting wires which are distributed into 3 wires at the upper part and 3 wires at the lower part, so that the arrangement can meet the electrical clearance among the leads, and the dry-type transformer is reasonable in layout, easy to identify and convenient to construct and operate.
Preferably, a cushion block with the thickness of 10mm is arranged between the upper half coil and the lower half coil of the low-voltage winding, the cushion block is distributed along the circumference 12 in an equal distribution mode, one end of the cushion block is clamped on the dovetail supporting strip, and the cushion block is made of DMC. The cushion blocks are not deviated and loosened by external force, the mechanical strength is increased, and the airflow channels of the upper coil and the lower coil are additionally arranged, so that hot air of the lower coil part is distributed out through the air passages between the cushion blocks, the heat dissipation effect of the low-voltage coil is increased, and the temperature rise of the coil can be reduced by 4-5K through tests.
Compared with the prior art, the invention has the following beneficial effects: on one hand, the mining variable-current mobile substation with the control power supply can well supply power to the control circuit of the frequency converter, meets the requirements of normal use and detection and debugging before use of the frequency converter, ensures that the power on and off of the main circuit and the control circuit are not influenced mutually, and realizes good functional effect; on the other hand, due to the integrity and the safety of the explosion-proof shell, the underground complex working environment is met, the occupied space of the equipment in the underground is reduced, the equipment is convenient to transport and install, the production cost and the daily maintenance workload of the equipment are reduced, and the design has the effects of convenience in maintenance, safety and durability.
Drawings
Fig. 1 is a front view of the overall structure of the present invention.
Fig. 2 is a top view of the overall structure of the present invention.
Fig. 3 is a schematic circuit diagram of the present invention.
Fig. 4 is a schematic diagram of the ground shields of one side winding and the secondary winding of the present invention.
Fig. 5 is a front view of the upper and lower coils and the spacer of the low voltage coil of the present invention.
FIG. 6 is a schematic top view of the upper and lower coils and spacers of the low voltage coil of the present invention
FIG. 7 is a schematic diagram of the high side wiring of the present invention.
FIG. 8 is a schematic diagram of the low-voltage side wiring of the present invention, wherein a1, b1, c1 are Y (star connection); a2, b2, c2 are Δ (triangle joining).
The figures are labeled as follows: 1-transformer part, 2-high voltage vacuum switch box, 3-low voltage protection box, 4-dry transformer for control power supply, 5-dry transformer for mine explosion-proof type transformer mobile substation, 6-explosion-proof joint surface, 7-explosion-proof shell, 8-secondary winding, 9-primary winding, 10-shielding ground layer, 11-transformer support, 12-transformer magnetic yoke, 13-framework, 14-dovetail stay, 15-Y wiring coil outlet, 16-cushion block, 17-Y wiring low voltage coil, 18-D wiring low voltage coil, 19-D wiring coil outlet, 20-high voltage wiring cavity and 21-low voltage wiring cavity.
Detailed Description
The present invention is further illustrated by the following specific examples.
A mining variable-current mobile substation with a control power supply is shown in figures 1-6: the transformer part 1 comprises a dry type transformer 5 for a mining explosion-proof type variable current mobile substation and a dry type transformer 4 for a control power supply, wherein the transformer part 1 comprises a transformer part 1, a high-voltage vacuum switch box 2 and a low-voltage protection box 3, an explosion-proof shell 7 is arranged outside the transformer part 1; the side surface of the high-pressure vacuum switch box 2 is provided with two B5 pressure plate type leading-in devices and four A4 pressure nut type leading-in devices, and the inside of the high-pressure vacuum switch box 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; one B5 pressure plate type leading-in device is connected with an isolating switch through a binding post and is divided into two paths from the rear of the isolating switch, one path is connected with the binding post of a dry type transformer 5 for a mine explosion-proof type variable current mobile transformer station through a vacuum circuit breaker, and the other path is connected with the binding post of a dry type transformer 4 for a control power supply through a high-voltage fast-melting coil; the low-voltage side of the dry type transformer 5 for the mining explosion-proof type current transformation mobile substation is connected with a low-voltage protection box 3 through a binding post and is led out through two pairs of B5 pressure plate type leading-in devices, the low-voltage side of the dry type transformer 4 for the control power supply is also connected with the low-voltage protection box 3 through the binding post and is led out through three A5 pressure plate type leading-in devices, and four A4 pressure nut type leading-in devices are further arranged on the side wall of the low-voltage protection box 3; the dry-type transformer 5 for the mining explosion-proof type current transformation mobile substation adopts a Dd0y11 connection group, wherein a high-voltage winding is in angular connection, and a low-voltage winding is in star connection and angular connection respectively; a shielding grounding layer 10 is arranged between the high-voltage winding and the low-voltage winding, and the shielding grounding layer is formed by a metal film which is vertically distributed on the surface of a cylindrical insulating layer between a primary winding 9 and a secondary winding 8; the iron 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 stepping full-inclined seam laminated structure, the iron cores of the high-voltage winding and the low-voltage winding adopt a non-porous binding mode, the cut of an iron core sheet is coated with antirust liquid, and the surfaces of an iron core column and a lower iron yoke are coated with high-temperature-resistant antirust moisture-proof paint; the clamping pieces of the high-voltage winding and the low-voltage winding adopt a channel steel structure, and a pull screw structure is adopted for vertical tensioning; the coil of the low-voltage winding consists of two coils, the upper half coil adopts a Y-shaped connection method, the lower half coil adopts a D-shaped connection method, the phase angles of the voltages are different by 30 degrees, and the number of the two coils is even; a high-voltage section adjusting device is further arranged at a high-voltage winding of the dry type transformer 5 for the mining explosion-proof type current transformation mobile substation; the dry type transformer 4 for the control power supply adopts 20KVA and a three-phase four-wire system wiring mode, and a high-voltage part and a low-voltage part are all star-connected; an explosion-proof joint surface 6 is arranged between the transformer part 1 and the high-voltage vacuum switch box 2, an explosion-proof joint surface 6 is also arranged on the explosion-proof shell 7, and the outer side of the position corresponding to the explosion-proof shell 7 of the dry type transformer 4 for the control power supply is also provided with the explosion-proof joint surface 6; an explosion-proof joint surface 6 is also arranged between the transformer part 1 and the low-voltage protection box 3.
The preferred scheme is adopted in the embodiment: the high-voltage and low-voltage winding coil of the dry type transformer 5 for the mining explosion-proof type current transformation mobile substation adopts a tightly winding and vacuum pressure paint dipping process and adopts a C-level insulated Nomex paper-coated oxygen-free copper wire; an insulating partition plate is arranged between the dry-type transformer 5 for the mining explosion-proof type variable current mobile substation and the dry-type transformer 4 for the control power supply; the dry-type transformer 4 for the control power supply is positioned below the side of the dry-type transformer 5 for the mining explosion-proof type variable current mobile substation and is longitudinally arranged, and the high-voltage side faces the explosion-proof shell 7; the high-voltage lead of the dry-type transformer 5 for the mining explosion-proof type current transformation mobile substation is led out in a D connection mode, and the head and the tail of the dry-type transformer are connected in an A-Z, B-X, C-Y connection mode; the high-voltage section adjusting device is arranged above a high-voltage winding of a dry type transformer 5 for the mine explosion-proof type transformer mobile substation, 6 leading-out soft connecting wires are arranged on the low-voltage side of the dry type transformer 5 for the mine explosion-proof type transformer mobile substation and are distributed into 3 pieces on the upper side and 3 pieces on the lower side; the coil of low pressure winding, set up 10mm thick cushion 16 between upper half solenoid and the lower half solenoid, cushion 16 is along circumference 12 partition distribution, and cushion one end card is on the forked tail stay, and the cushion material is DMC.
The high/low voltage side wiring in this embodiment is shown in FIGS. 7 to 8. The specific operation is as follows: the transformer part 1, the high-voltage vacuum switch box 2, the low-voltage protection box 3 and the explosion-proof shell 7 are assembled according to the figure 1, then are respectively connected, and finally are put into use.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.
Claims (8)
1. The utility model provides a mining conversion mobile substation of area control power supply which characterized in that: the transformer part (1) comprises a dry type transformer (5) for a mining explosion-proof type transformer mobile substation and a dry type transformer (4) for a control power supply, wherein the transformer part (1) is externally provided with an explosion-proof shell (7);
the side surface of the high-pressure vacuum switch box (2) is provided with two B5 press disc type leading-in devices and four A4 press nut type leading-in devices, and the inside of the high-pressure vacuum switch box 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; one B5 pressure plate type leading-in device is connected with an isolating switch through a binding post and is divided into two paths from the rear of the isolating switch, one path is connected with the binding post of a dry type transformer (5) for a mining explosion-proof type variable current mobile transformer station through a vacuum circuit breaker, and the other path is connected with the binding post of a dry type transformer (4) for a control power supply through a high-voltage fast-melting coil; the low-voltage side of the dry type transformer (5) for the mining explosion-proof type current transformation mobile substation is connected with a low-voltage protection box (3) through a binding post and is led out through two pairs of B5 pressure disc type leading-in devices, the low-voltage side of the dry type transformer (4) for the control power supply is also connected with the low-voltage protection box (3) through the binding post and is led out through three A5 pressure disc type leading-in devices, and four A4 pressure nut type leading-in devices are further arranged on the side wall of the low-voltage protection box (3);
the dry-type transformer (5) for the mining explosion-proof type current transformation mobile substation adopts a Dd0y11 connection group, wherein a high-voltage winding is in angular connection, and a low-voltage winding is in star connection and angular connection respectively; a shielding grounding layer (10) is arranged between the high-voltage winding and the low-voltage winding, and the shielding grounding layer is formed by vertically distributed metal films on the surface of a cylindrical insulating layer between a primary winding (9) and a secondary winding (8); the iron 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 stepping full-inclined seam laminated structure, the iron cores of the high-voltage winding and the low-voltage winding adopt a non-porous binding mode, the cut of an iron core sheet is coated with antirust liquid, and the surfaces of an iron core column and a lower iron yoke are coated with high-temperature-resistant antirust moisture-proof paint; the clamping pieces of the high-voltage winding and the low-voltage winding adopt a channel steel structure, and a pull screw structure is adopted for vertical tensioning; the coil of the low-voltage winding consists of two coils, the upper half coil adopts a Y-shaped connection method, the lower half coil adopts a D-shaped connection method, the phase angles of the voltages are different by 30 degrees, and the number of the two coils is even; a high-voltage section adjusting device is further arranged at a high-voltage winding of the dry type transformer (5) for the mining explosion-proof type current transformation mobile substation;
the dry type transformer (4) for the control power supply adopts 20KVA and a three-phase four-wire system wiring mode, and a high-voltage part and a low-voltage part are all star-connected;
an explosion-proof joint surface (6) is arranged between the transformer part (1) and the high-voltage vacuum switch box (2), an explosion-proof joint surface (6) is also arranged on the explosion-proof shell (7), and the explosion-proof joint surface (6) is also arranged on the outer side of the position, corresponding to the explosion-proof shell (7), of the dry type transformer (4) for the control power supply; an explosion-proof joint surface (6) is also arranged between the transformer part (1) and the low-voltage protection box (3).
2. The mining variable-current mobile substation with the control power supply according to claim 1, characterized in that: the high-voltage and low-voltage winding coil of the dry type transformer (5) for the mining explosion-proof type current transformation mobile substation adopts a tightly winding and vacuum pressure paint dipping process and adopts a C-level insulated Nomex paper-coated oxygen-free copper wire.
3. The mining variable-current mobile substation with the control power supply according to claim 1, characterized in that: an insulating partition plate is arranged between the dry-type transformer (5) for the mining explosion-proof type current transformation mobile substation and the dry-type transformer (4) for the control power supply.
4. The mining variable-current mobile substation with the control power supply according to claim 1, characterized in that: the dry type transformer (4) for the control power supply is located below the side of the dry type transformer (5) for the mining explosion-proof type variable current mobile substation and is longitudinally placed, and the high-voltage side faces the explosion-proof shell (7).
5. The mining variable-current mobile substation with the control power supply according to claim 1, characterized in that: the high-voltage lead of the dry-type transformer (5) for the mining explosion-proof type current transformation mobile substation is led out in a D connection mode, and the head and the tail of the dry-type transformer are connected in an A-Z, B-X, C-Y connection mode.
6. The mining variable-current mobile substation with the control power supply according to claim 1, characterized in that: the high-voltage section adjusting device is arranged on a high-voltage winding of a dry type transformer (5) for the mine explosion-proof type variable current mobile substation.
7. The mining variable-current mobile substation with the control power supply according to claim 1, characterized in that: the low-voltage side of the dry-type transformer (5) for the mining explosion-proof type current transformation mobile substation is provided with 6 leading-out flexible connecting wires which are distributed into 3 pieces at the upper part and 3 pieces at the lower part.
8. The mining variable-current mobile substation with the control power supply according to claim 1, characterized in that: according to the coil of the low-voltage winding, a cushion block (16) with the thickness of 10mm is arranged between an upper half coil and a lower half coil, the cushion block (16) is distributed along the circumference 12 in an equal distribution mode, one end of the cushion block is clamped on a dovetail supporting strip, and the cushion block is made of DMC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110443437.2A CN113036650A (en) | 2021-04-23 | 2021-04-23 | Mining variable-current mobile substation with control power supply |
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| CN202110443437.2A CN113036650A (en) | 2021-04-23 | 2021-04-23 | Mining variable-current mobile substation with control power supply |
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| CN214899767U (en) * | 2021-04-23 | 2021-11-26 | 山西华鑫电气有限公司 | Mining variable-current mobile substation with control power supply |
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| US20100109582A1 (en) * | 2006-12-27 | 2010-05-06 | Teroede Gerd | Method for controlling a load with a predominantly inductive character and a device applying such a method |
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