1140V mining long-distance power supply device

Abstract

The 1140V mining long-distance power supply device comprises an explosion-proof shell, a frequency converter, a dry-type transformer, a heat exchanger, an output reactor and a contactor assembly, and the frequency converter is composed of a rectification part and an inversion part; the explosion-proof device is characterized in that an insulating partition plate is arranged in an inner cavity of the explosion-proof shell; the input end of the frequency converter is connected with a power grid through an input reactor, the output end of the frequency converter is connected with a primary winding terminal of the dry-type transformer through an output reactor, and a secondary winding terminal of the dry-type transformer is connected to the power grid through a contactor assembly. According to the mining long-distance power supply device, the voltage on the power grid is rectified and inverted by the frequency converter, boosted by the dry-type transformer and then input to the power grid, so that reactive current and active current can be effectively supplemented for power grid voltage fluctuation caused by impact of a nonlinear load in an underground coal mine; and the phenomenon that the tail end voltage of underground coal mine equipment is low is avoided as much as possible.

Description

TECHNICAL FIELD

[0001] The utility model relates to a 1140V mine long distance power supply device, more specifically, especially relates to a 1140V mine long distance power supply device capable of reducing the grid voltage reduction caused by reactive current and active current of terminal equipment. BACKGROUND

[0002] With the continuous improvement of modernization and intelligent production degree of coal mine underground production, the proportion of high-power motor equipment use is increasing, and the use of some impact load and nonlinear load leads to a series of power quality problems such as power factor reduction, voltage fluctuation, voltage and current waveform distortion of power grid, which leads to misoperation or refusal of relay protection and automatic device in power distribution system, destroys microcomputer protection, and causes large error of comprehensive automation device, instrument and electric energy metering.

[0003] At present, the distance between the equipment and the power supply of the coal mine underground heading face is generally between 1000m-1500m, and if the power supply distance is increased, the terminal voltage of the heading face will be low, which will lead to difficult starting of the heading motor and even burning.

[0004] At present, the coal mine underground heading face power supply generally has the problem of low terminal voltage of terminal equipment in long distance power supply as introduced above, and the following measures are mainly taken at present:

[0005] (1) Increase the power supply head power voltage to make up for the loss on the line, but this will increase the total installed capacity of the front power supply, and at the same time, when the equipment is shut down or running at no load, it will cause the voltage of the equipment and cable to be too high, which will pose a certain threat to the insulation voltage resistance of the cable and equipment.

[0006] (2) Move the position of the mobile transformer forward to reduce the length of the power cable between the related equipment and the power supply, and then reduce the voltage drop on the cable. Or take the scheme of parallel connection of multiple power cables to reduce the equivalent impedance of the cable and then reduce the voltage drop on the cable. This scheme greatly increases the workload of coal mine heading operation, reduces the work efficiency, and cannot effectively compensate for the power quality of the power supply system and the cable loss caused by reactive current, resulting in waste of electric energy and increase of heading operation cost.

[0007] The main reason for the low terminal voltage of underground equipment is the voltage drop caused by the reactive current and active current of the related inductive motor equipment in the power supply line, so how to reduce the voltage drop of the reactive and active current of the related equipment on the cable is the key to solve the related problems. SUMMARY

[0008] The utility model discloses in order to overcome the shortcoming of above -mentioned technical problem provides a 1140V mine long distance power supply device.

[0009] The utility model discloses a 1140V mine long -distance power supply unit, including the explosion -proof casing, frequency converter, dry -type transformer, heat exchanger, output electric reactor, input contactor and contactor subassembly, is provided with the door plate on the explosion -proof casing, and the frequency converter is constituted by rectification part and inverter part, the heat exchanger, dry -type transformer and output electric reactor are set up in the rear of the internal cavity of explosion -proof casing, and the frequency converter is fixed on the inboard of door plate, and the heat exchanger and output electric reactor are located dry -type transformer's left side and right side respectively, its characterized in that: the internal cavity of explosion -proof casing is provided with the insulating partition that separates dry -type transformer and output electric reactor with frequency converter, and the input of frequency converter is connected with the power grid through input contactor, and the output of frequency converter is connected with the primary winding terminal of dry -type transformer through output electric reactor, and the secondary winding terminal of dry -type transformer is connected on the power grid through contactor subassembly.

[0010] The utility model discloses a 1140V mine long -distance power supply unit, the heat exchanger is constituted by centrifugal fan, heat exchange pipe, heat exchange sheet and heat dissipation air duct, and the centrifugal fan is set up at the air outlet of heat dissipation air duct, and the heat exchange sheet is set up in heat dissipation air duct, and the heat exchange pipe is fixed with heat exchange sheet, and the periphery of dry -type transformer is provided with the peripheral plate, and the air inlet chamber of upper end opening is formed between the peripheral plate and dry -type transformer, and the air inlet of heat dissipation air duct is connected with air inlet chamber.

[0011] The utility model discloses a 1140V mine long -distance power supply unit, and the periphery of explosion -proof casing at heat exchanger position is provided with the explosion -proof board, and the explosion -proof board is provided with the water inlet and the water outlet interface that communicate respectively with the both ends of heat exchange pipe, and the contact surface of explosion -proof board and explosion -proof casing is explosion -proof surface.

[0012] The utility model discloses a 1140V mine long -distance power supply unit, and the input contactor is connected on the power grid through fuse and wall -penetrating terminal, and the internal cavity of explosion -proof casing is provided with the buffer resistance component that is parallelly connected with input contactor, and the upper portion of output electric reactor is provided with the filter capacitance component that is parallelly connected with it.

[0013] The utility model discloses a 1140V mine long -distance power supply unit, the front side of heat exchanger is provided with control transformer, and the upper portion of output electric reactor is provided with lighting transformer, and the right upper side of control transformer is provided with power component, and the input of control transformer and lighting transformer is connected with the lower wiring port of input contactor, and the output of control transformer is connected with power component, and the output of lighting transformer is connected with external lighting circuit through wall -penetrating terminal.

[0014] The utility model discloses a 1140V mine long -distance power supply unit, and the rear side of explosion -proof casing is the corrugated backboard of increasing the area of heat dissipation.

[0015] The utility model discloses a 1140V mine long distance power supply device, the contactor subassembly is by the bottom plate and is fixed on the output contactor, thyristor and bypass contactor of bottom plate, and the input end of output contactor is connected with the input end of bypass contactor through thyristor, and the parallel connection of thyristor and dry type transformer.

[0016] The utility model discloses a 1140V mine long distance power supply device, the upper portion of filter capacitor subassembly is provided with leakage lockout subassembly, and leakage lockout subassembly is by the base and is fixed on the leakage lockout circuit board and high voltage ceramic relay of base, and high voltage ceramic relay is used for the control of the on-off state of power grid input.

[0017] The utility model discloses a 1140V mine long distance power supply device, the upper portion of input contactor is provided with external water machine control subassembly, and external water machine control subassembly is used for controlling the water cooling system of load motor.

[0018] The utility model discloses a 1140V mine long distance power supply device, sets up heat exchanger, frequency converter, dry type transformer, output electric reactor and contactor subassembly in explosion -proof enclosure, and power grid is connected in the input end of frequency converter through input contactor, and the output end of frequency converter is connected on the primary side winding of dry type transformer through output electric reactor, and the secondary side winding of dry type transformer is connected on the power grid through contactor subassembly, like this, the voltage on the power grid is converted into phase and power controllable ac input to dry type transformer after rectification, inversion of frequency converter, and is input to the power grid after the step -up of dry type transformer, can effectively carry out the reactive current and active current of power grid voltage fluctuation caused by coal mine downhole impact nonlinear load and supplement, as far as possible avoided the phenomenon of low voltage of coal mine downhole equipment end, compared with the prior art of improving power supply first end power voltage, will not increase the total installed capacity of power supply source, compared with the prior art of moving the position of mobile transformer forward, will not increase the workload of coal mine tunneling operation, effectively realizes the reactive current and active current of inductive motor equipment in power supply line compensation.

[0019] Further, by setting the insulating partition in the explosion -proof enclosure, the dry type transformer and output electric reactor are separated from the frequency converter, the heat influence of the heating device on the circuit board and the frequency converter is reduced, and the adverse effect of the dry type transformer leakage magnetic on the frequency converter is reduced.

[0020] Further, by setting the radiator composed of centrifugal fan, heat exchange pipe, heat dissipation air duct and heat exchange fin in the explosion -proof enclosure, the air inlet of heat dissipation air duct and the air inlet cavity between the peripheral plate and the dry type transformer are communicated, so that the circulation flow of the air in the heat dissipation air duct in the explosion -proof enclosure is realized by the centrifugal fan, and then the cooling liquid flowing in the heat exchange pipe carries away the heat generated by the dry type transformer and other devices, so as to ensure the normal work of the mine long distance power supply device.

[0021] Further, by setting the contactor assembly composed of output contactor, thyristor and bypass contactor, when the dry-type transformer fails, it can be bypassed, which facilitates the maintenance of the dry-type transformer and ensures uninterrupted reactive power compensation of the frequency converter to the power grid.

[0022] Further, by setting the leakage lockout assembly, when a leakage fault occurs, the leakage lockout circuit board cuts off the input of the power grid through the high-voltage ceramic relay to ensure the safety of the equipment and personnel.

[0023] Further, by setting the external water machine control assembly, the water cooling system of the load motor can be monitored to ensure the safe operation of the water-cooled motor. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a front view of the 1140V mine long-distance power supply device of the utility model;

[0025] Figure 2 It is a perspective view of the 1140V mine long-distance power supply device of the utility model;

[0026] Figure 3 , Figure 4 and Figure 5 It is a perspective view of the 1140V mine long-distance power supply device of the utility model after removing part of the shell;

[0027] Figure 6 It is a sectional view of the 1140V mine long-distance power supply device of the utility model;

[0028] Figure 7 It is a structural schematic view of the dry-type transformer in the utility model;

[0029] Figure 8 It is a structural schematic view of the leakage lockout assembly in the utility model;

[0030] Figure 9 It is a structural schematic view of the contactor assembly in the utility model;

[0031] Figure 10 It is a structural schematic view of the buffer resistance assembly in the utility model.

[0032] In the figure: 1 explosion-proof shell, 2 door plate, 3 insulation partition, 4 front cavity, 5 rear cavity, 6 frequency converter, 7 dry-type transformer, 8 heat exchanger, 9 output reactor, 10 centrifugal fan, 11 fuse, 12 input contactor, 13 buffer resistance assembly, 14 filter capacitor assembly, 15 contactor assembly, 16 control transformer, 17 lighting transformer, 18 power supply assembly, 19 leakage locking assembly, 20 external water machine control assembly, 21 heat exchange pipe, 22 water inlet interface, 23 water outlet interface, 24 corrugated back plate, 25 base, 26 leakage locking circuit board, 27 high-voltage ceramic relay, 28 bottom plate, 29 output contactor, 30 thyristor, 31 bypass contactor, 32 explosion-proof plate, 33 peripheral plate, 34 air inlet cavity, 35 heat dissipation air duct, 36 heat exchange fin. DETAILED DESCRIPTION

[0033] The utility model will be further described below in combination with the drawings and examples.

[0034] As shown in Figure 1 and Figure 2 , the front view and perspective view of the 1140V mine long-distance power supply device of the utility model are respectively given, Figure 3 , Figure 4 and Figure 5 all give the perspective view after removing part of the shell, Figure 6 give its sectional view, the 1140V mine long-distance power supply device shown is composed of explosion-proof shell 1 and heat exchanger 8, frequency converter 6, output reactor 9, dry-type transformer 7, contactor assembly 15 arranged in the internal cavity of the explosion-proof shell, the internal cavity in the explosion-proof shell 1 is provided with insulation partition 3, the internal cavity in the middle and right side of the explosion-proof shell 1 is divided into front cavity 4 and rear cavity 5 by insulation partition 3. The door plate 2 is arranged on the explosion-proof shell 1. The frequency converter 6 is composed of rectification part and inversion part, so as to rectify and invert the input alternating current in turn, the frequency converter 6 is fixed on the inner side surface of the door plate 2, so that the frequency converter 6 is located in the front cavity 4.

[0035] The heat exchanger 8, dry-type transformer 7 and output reactor 9 are all arranged at the bottom of the rear cavity 5, and the dry-type transformer 7 and output reactor 9 are isolated from the frequency converter 6 by the insulation partition 3. The dry-type transformer 7 and output reactor 9 are isolated from the frequency converter 6 by the insulation partition 3, which reduces the thermal influence of the heat generating device on the circuit board and the frequency converter 6, and reduces the adverse effect of dry-type transformer 7 leakage magnetic on the frequency converter 6.

[0036] The input of the external power grid is connected to the input of the frequency converter 6 through the input contactor 12, the output of the frequency converter 6 is connected to the terminal of the primary winding of the dry-type transformer 7 through the output reactor 9, and the terminal of the secondary winding of the dry-type transformer 7 is connected to the external power grid through the contactor assembly 15. In this way, the alternating current input from the power grid is first processed by the rectifying part of the frequency converter 6 and is converted into direct current, and then the inverting part of the frequency converter 6 is controlled to convert the direct current into alternating current with controllable phase and power according to the fluctuation of the power grid caused by the impact load on the power grid, so that the alternating current output from the frequency converter 6 is input to the power grid through the voltage boost of the dry-type transformer 7 to compensate for the voltage drop caused by the reactive current and active current of the impact equipment on the power grid and to maintain the stability of the terminal voltage of the coal mine tunneling equipment.

[0037] The heat exchanger 8 is composed of a centrifugal fan 10, heat exchange pipes 21, a heat dissipation air duct 35 and heat exchange fins 36. The upper end of the heat dissipation air duct 35 is an air outlet, the lower end is an air inlet, the heat exchange fins 36 are arranged in the heat dissipation air duct 35, the heat exchange pipes 21 are in a continuous S shape, and the heat exchange pipes 21 are fixed to the heat exchange fins 36. The centrifugal fan 10 is arranged at the air outlet of the heat dissipation air duct 35. The periphery of the dry-type transformer 7 is provided with a peripheral plate 33, and the peripheral plate 33 and the shell of the dry-type transformer 7 form an air inlet cavity 34 with an open upper end.

[0038] In this way, under the effect of the centrifugal fan 10, the air in the explosion-proof housing 1 enters the air inlet cavity 34, exchanges heat with the heat exchange fins 36, and then transfers the heat generated by the coils and other devices of the dry-type transformer 7 to the cooling medium in the heat exchange pipes 21 and is carried away by the cooling medium circulating in the heat exchange pipes 21. Under the effect of the centrifugal fan 10, the air in the explosion-proof housing 1 circulates in the heat dissipation air duct 35, so that the temperature of the dry-type transformer 7 and other heat generating devices in the explosion-proof housing 1 can be maintained at a suitable temperature to ensure the long-term stable operation of the entire device.

[0039] The outer side of the explosion-proof housing 1 at the position of the heat exchanger 8 is provided with an explosion-proof plate 32, the explosion-proof plate 32 is provided with a water inlet interface 22 and a water outlet interface 23, the water inlet interface 22 and the water outlet interface 23 are connected to the two ends of the heat exchange pipes 21 respectively, so that the cooling medium in the heat exchange pipes 21 is connected to the cooling device outside the explosion-proof housing 1 through the water inlet interface 22 and the water outlet interface 23 to carry away the heat carried by the cooling medium. In order to ensure the overall explosion-proof performance of the explosion-proof housing 1, the contact surface between the explosion-proof plate 32 and the explosion-proof housing 1 is an explosion-proof surface.

[0040] The upper side of the heat exchanger 8 is provided with an input contactor 12 and a fuse 11 from bottom to top in sequence, the upper wiring port of the input contactor 12 is connected with the power grid through a wall terminal, the fuse 11 is arranged on the upper wiring port of the input contactor, and the lower wiring port of the input contactor 12 is connected with the input end of the frequency converter 6. In this way, the alternating current on the power grid is input to the frequency converter 6 through the wall terminal, the fuse 11 and the input contactor 12 in sequence. The front side of the heat exchanger 8 is provided with a buffer resistance assembly 13, the buffer resistance assembly 13 is connected in parallel with the input contactor 12, when the power grid voltage is input to the frequency converter 6, the buffer resistance assembly 13 is first used for buffering power-on, and then the input contactor 12 is closed after power-on is completed.

[0041] The right side of the buffer resistance assembly 13 is provided with a control transformer 16, the upper right side of the control transformer 16 is provided with a power supply assembly 18, the upper side of the output reactor 9 is provided with an illumination transformer 17 and a filter capacitor assembly 14, the filter capacitor assembly 14 is connected in parallel with the output reactor 9, and the filter capacitor assembly 14 is used for filtering out noise. The input ends of the control transformer 16 and the illumination transformer 17 are connected with the lower wiring port of the disconnecting switch 10, so that the power supply of the control transformer 16 and the illumination transformer 17 by the power grid is not affected in the case that the fuse 11 is disconnected. The control transformer 16 is used for supplying power to the power supply assembly 18, and the illumination transformer 17 supplies power to the illumination loop outside through a wall terminal.

[0042] The power supply assembly 18 is provided with a line board of a control contactor and an axial flow fan, a switching power supply and a pulse group suppressor, and the power supply assembly 18 is designed as an openable and closable structure, so that when the devices on the power supply assembly 18 need to be maintained, the power supply assembly 18 can be opened as a whole.

[0043] The contactor assembly 15 is arranged above the dry-type transformer 7, as shown in the drawing, Figure 7 The structure schematic view of the dry-type transformer in the utility model is shown, Figure 9 The structure schematic view of the contactor assembly in the utility model is shown, the contactor assembly 15 is composed of a bottom plate 28, an output contactor 29, a silicon controlled rectifier 30 and a bypass contactor 31 fixed on the bottom plate 28, the input end of the output contactor 29 is connected with the input end of the bypass contactor 31 through the silicon controlled rectifier 30, the input end of the bypass contactor 31 is connected with the primary side of the dry-type transformer 7, the secondary side of the dry-type transformer 7 is connected with the input end of the output contactor 29, and the output ends of the output contactor 29 and the bypass contactor 31 are connected with the power grid through wall terminals.

[0044] In the normal working state, the output of the dry-type transformer 7 is output to the power grid through the output reactor 8, realizing the reactive and active power supplement to the power grid to avoid the low voltage at the end of the coal mine underground equipment. When the dry-type transformer 7 fails, the thyristor 30 is turned on, the dry-type transformer 7 is short-circuited, and the output of the frequency converter 6 is input to the power grid through the bypass contactor 31.

[0045] The upper part of the filter capacitor assembly 14 is provided with a leakage locking assembly 19, as shown. Figure 8 As shown, the structure diagram of the leakage locking assembly in the utility model is given, and the leakage locking assembly is composed of a base 25, a leakage locking circuit board 26 fixed on the base 25 and a high-voltage ceramic relay 27. When the leakage locking circuit board 26 detects that the power supply device of the utility model has a leakage fault, the connection with the power grid is cut off through the high-voltage ceramic relay 27, so as to realize the protection of the equipment.

[0046] The upper part of the disconnector 10 is provided with an external water machine control assembly 20, which is used for controlling the water cooling system of the load motor to ensure the stable operation of the water-cooled motor. As shown, Figure 10 As shown, the structure diagram of the buffer resistance assembly in the utility model is given. In the power supply device of the utility model, the buffer resistance assembly 13, the power supply assembly 18, the contactor assembly 15, the leakage locking assembly 19 and the external water machine control assembly 20 are all designed in the form of assembly, so as to facilitate the disassembly and maintenance in the later period.

Claims

1. An 1140V long-distance power supply device for mining, comprising an explosion-proof housing (1), a frequency converter (6), a dry-type transformer (7), a heat exchanger (8), an output reactor (9), an input contactor (12) and a contactor assembly (15), wherein a door panel (2) is provided on the explosion-proof housing, and the frequency converter is composed of a rectifier part and an inverter part; the heat exchanger, the dry-type transformer and the output reactor are arranged on the rear side of the internal cavity of the explosion-proof housing, the frequency converter is fixed on the inner side of the door panel, and the heat exchanger and the output reactor are respectively located on the left and right sides of the dry-type transformer; and the device is characterized in that: An insulating partition (3) is provided in the internal cavity of the explosion-proof housing to isolate the dry-type transformer and the output reactor from the frequency converter; the input end of the frequency converter is connected to the power grid via the input contactor (12), the output end of the frequency converter is connected to the primary winding terminal of the dry-type transformer via the output reactor, and the secondary winding terminal of the dry-type transformer is connected to the power grid via the contactor assembly.

2. The 1140V long-distance power supply device for mining according to claim 1, characterized in that: The heat exchanger (8) is composed of a centrifugal fan (10), a heat exchange tube (21), a heat exchange fin (36) and a heat dissipation duct (35). The centrifugal fan is arranged at the air outlet of the heat dissipation duct, the heat exchange fin is arranged in the heat dissipation duct, and the heat exchange tube is fixed to the heat exchange fin. An outer plate (33) is arranged on the periphery of the dry-type transformer. An air inlet cavity (34) with an upper end opening is formed between the outer plate and the dry-type transformer. The air inlet cavity is connected to the air inlet of the heat dissipation duct.

3. The 1140V long-distance power supply device for mining according to claim 2, characterized in that: An explosion-proof plate (32) is provided on the periphery of the explosion-proof housing (1) at the position of the heat exchanger (8), and a water inlet interface (22) and a water outlet interface (23) are provided on the explosion-proof plate, which are respectively connected to the two ends of the heat exchange tube (21), and the contact surface between the explosion-proof plate and the explosion-proof housing is an explosion-proof surface.

4. The 1140V long-distance power supply device for mining according to claim 1 or 2, characterized in that: The input contactor (12) is connected to the power grid via the fuse (11) and the through-wall terminal. A buffer resistor component (13) connected in parallel with the input contactor is provided in the internal cavity of the explosion-proof housing (1). A filter capacitor component (14) connected in parallel with the output reactor (9) is provided above the output reactor (9).

5. The 1140V long-distance power supply device for mining according to claim 4, characterized in that: A control transformer (16) is provided on the front side of the heat exchanger (8), a lighting transformer (17) is provided above the output reactor (9), and a power supply assembly (18) is provided on the upper right side of the control transformer. The input ends of the control transformer and the lighting transformer are both connected to the lower wiring port of the input contactor (12), the output of the control transformer is connected to the power supply assembly, and the output of the lighting transformer is connected to the external lighting circuit via a through-wall terminal.

6. The 1140V long-distance power supply device for mining according to claim 1 or 2, characterized in that: The rear side of the explosion-proof housing (1) is a corrugated back plate (24) for increasing the heat dissipation area.

7. The 1140V long-distance power supply device for mining according to claim 1 or 2, characterized in that: The contactor assembly (15) is composed of a base plate (28), an output contactor (29), a thyristor (30), and a bypass contactor (31) fixed to the base plate. The input end of the output contactor is connected to the input end of the bypass contactor via the thyristor, and the thyristor is connected in parallel with the dry-type transformer.

8. The 1140V long-distance power supply device for mining according to claim 5, characterized in that: A leakage locking assembly (19) is provided above the filter capacitor assembly (14). The leakage locking assembly is composed of a base (25), a leakage locking circuit board (26) fixed to the base, and a high-voltage ceramic relay (27). The high-voltage ceramic relay is used to control the on / off state of the grid input.

9. The 1140V long-distance power supply device for mining according to claim 1 or 2, characterized in that: An external water machine control component (20) is provided above the input contactor (12), and the external water machine control component is used to control the water cooling system of the load motor.

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