An integrated high-voltage solid-state soft start device for mining

Abstract

The invention discloses an integrated high-voltage solid-state soft start device for mining, comprising a supporting protection structure, an upper device module, a thyristor module and a lower electrical component; the upper device module comprises a device chamber (10), a high-voltage fuse (2) and a voltage transformer (3) arranged on one side of the device chamber (10); the thyristor module comprises a thyristor valve group (12), an upper beam insulator (4) and a call sensor (6); the lower electrical component comprises a high-voltage vacuum contactor (7), a current transformer (8), an incoming cable (9) and an outgoing cable (15); the incoming cable (9) passes through the current transformer (8) and is connected to a copper bus (26). The starting device of the invention provides a soft start device with excellent voltage and current controllability in a mine passage without the danger of gas and dust explosion, which can effectively eliminate the impact of motor starting on the power grid and realize accurate control of the motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor control equipment, and more specifically, relates to an integrated high-voltage solid-state soft starting device for mining. Background Art

[0002] In recent years, as the country vigorously advocates energy conservation and emission reduction, a large number of small and medium-sized mining companies have eliminated obsolete low-voltage motors and replaced them with high-voltage motors. Especially for some water pumps and ventilation equipment in mines, the motors are generally large, which requires the use of high-voltage soft start equipment. In recent years, the technology has developed more maturely, and the high-voltage solid-state soft start device with high cost performance has become the only choice.

[0003] High voltage solid-state soft start equipment is widely used in petroleum, chemical, building materials, steel, papermaking and military industries. After years of development, it has become the mainstream configuration of high voltage motor starting equipment below 6000KW due to its wide application field, good starting performance, and especially suitable for various harsh working environments.

[0004] Traditional high-voltage solid-state soft start devices have the following shortcomings: (1) During the starting process of the high-voltage AC asynchronous motor, only simple control methods such as voltage ramp control, current ramp control, and jump start can be implemented, and precise control of the motor cannot be achieved; (2) Low-speed speed regulation movement (such as 8% or 15% of the rated speed) cannot be achieved. For some equipment that requires low-speed adjustment (such as belt conveyors), there is no way to meet customer needs; (3) Forward and reverse switching cannot be achieved without phase adjustment or changing the wiring. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an integrated high-voltage solid-state soft starting device for mining, which provides a soft starting device with excellent voltage and current controllability for mine passages without the risk of gas and dust explosion. It can effectively eliminate the impact of motor startup on the power grid and achieve precise control of the motor.

[0006] In order to achieve the above-mentioned object, the present invention provides an integrated high-voltage solid-state soft start device for mining, comprising a supporting and protective structure, an upper device module, a thyristor module and a lower electrical component arranged in the supporting and protective structure; wherein,

[0007] The upper device module comprises a device chamber (10), a high-voltage fuse (2) and a voltage transformer (3) arranged on one side of the device chamber (10), and the outlet terminal of the high-voltage fuse (2) is connected to the inlet terminal of the voltage transformer (3);

[0008] The thyristor module comprises a thyristor valve group (12), an upper beam insulator (4) and an incoming call sensor (6); a copper busbar (26) is connected between the upper beam insulator (4) and the incoming call sensor (6) and connected to the incoming line end of the thyristor valve group (12);

[0009] The lower electrical assembly comprises a high-voltage vacuum contactor (7), a current transformer (8), an incoming cable (9) and an outgoing cable (15); the incoming cable (9) passes through the current transformer (8) and is connected to a copper bar (26); the bottom end of the copper bar (26) is fixedly connected to the incoming call sensor (6) and then led down to connect to the high-voltage vacuum contactor (7); the top end passes through the upper beam insulator (4) and is connected to the incoming end of the high-voltage fuse (2); the outgoing end of the thyristor valve group (12) is connected to the outgoing cable (15) by a copper bar (26); and the outgoing cable (15) is connected to the high-voltage vacuum contactor (7).

[0010] Furthermore, the support and protection structure comprises a support installation unit, and the support installation unit comprises a shell composed of anti-corrosion and moisture-proof aluminum-zinc coated plates, a lower side beam (21), an upper side beam (23) and a mounting bracket (25);

[0011] The housing is sleeved on the mounting bracket (25) and is divided into three layers: upper, middle and lower. The upper layer is used to mount the upper device module, the middle layer is used to mount the thyristor module, and the lower layer is used to mount the electrical components.

[0012] The upper beam (23) is arranged at the bottom of the upper device module, and the lower beam (21) is arranged at the bottom of the thyristor module.

[0013] Furthermore, the left and right sides of the shell are respectively spliced ​​into a whole by two pieces of aluminum-zinc coated plates, which are riveted to the surrounding mounting brackets (25), and the surrounding mounting brackets (25) are folded in half by the aluminum-zinc coated plates to form a C-shaped structure.

[0014] Furthermore, the supporting protection structure comprises an internal environment protection unit, and the internal environment protection unit comprises an anti-drip protection plate (1) and an insulating baffle (13);

[0015] The anti-drip guard plate (1) is a plate-shaped structure and is arranged on the top of the mounting bracket (25);

[0016] The insulating baffle (13) is a plate-shaped structure and is fixed to a side surface of the mounting bracket (25) by means of bolts.

[0017] Furthermore, the internal environment protection unit comprises a filter (17) and an exhaust fan (18);

[0018] The filter screen (17) is arranged at a corner of the bottom of the housing;

[0019] The exhaust fan (18) is arranged on one side of the top of the housing.

[0020] Furthermore, the internal environment protection unit comprises a plate heater (24), and the plate heater (24) is arranged on one side surface of the bottom of the outer shell.

[0021] Furthermore, the thyristor module comprises a lower beam insulator (14), the top of which is fixedly connected to the lower beam (21), and the other end of which is connected to a copper busbar (26).

[0022] Furthermore, the thyristor module comprises an upper rectangular insulating beam (19) and a lower rectangular insulating beam (20);

[0023] The top of the thyristor valve group (12) is fixedly connected to the upper rectangular insulating cross beam (19) via mounting bolts (22), and the bottom is fixedly connected to the lower side beam (21) via a lower rectangular insulating cross beam (20).

[0024] Furthermore, the lower electrical component comprises a zero-sequence transformer (16), which is fixed on a mounting bracket (25), and the outgoing cable (15) passes through its inner hole.

[0025] Furthermore, the upper device module comprises a control panel (11), and the control panel (11) is arranged on the upper front part of the housing.

[0026] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0027] 1. The starting device of the present invention provides a soft starting device with excellent voltage and current controllability for mine passages without gas and dust explosion hazards, which can effectively eliminate the impact of motor starting on the power grid and achieve precise control of the motor.

[0028] 2. The starting device of the present invention adopts riveting to provide a good sealing environment for the high-voltage solid-state soft starting device, and the use of aluminum-zinc coated plate can ensure that the high-voltage solid-state soft starting device will not be corroded when working in a humid environment, effectively avoiding the occurrence of safety hazards.

[0029] 3. The starting device of the present invention controls the temperature and humidity of the internal environment of the high-voltage solid-state soft starting device through the heater to ensure that the electrical components inside it provide a suitable working environment. A filter is provided inside the rectangular area to facilitate ventilation of the high-voltage solid-state soft starting device.

[0030] 4. The starting device of the present invention utilizes the arc extinguishing principle of the vacuum arc extinguishing chamber to remotely control the on and off of the circuit where the high-voltage vacuum contactor is located, which is beneficial to effectively control the high-voltage solid-state soft starting device and improve the controllability of the high-voltage solid-state soft starting device.

[0031] 5. In the starting device of the present invention, the through-type current transformer is horizontally arranged and fixed on the vertical surface of the L-shaped base by bolts, and is used to measure the current state of the three-phase electricity derived by the high-voltage solid-state soft-starting device, and convert the derived current state into an electrical signal and feed it back to the control system, so that the staff can timely control the working state of the high-voltage solid-state soft-starting device and improve the accuracy of the high-voltage solid-state soft-starting device.

[0032] 6. In the starting device of the present invention, the voltage transformer is fixed to the back of the secondary device chamber by bolts, and is used to measure the real-time voltage of the high-voltage solid-state soft starting device. Through the cooperation of the voltage transformer and the current transformer, the current entering the thyristor module can be accurately calculated, thereby improving the reliability and accuracy of the high-voltage solid-state soft starting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a front view of an integrated high-voltage solid-state soft starter for mining according to an embodiment of the present invention;

[0034] Figure 2 This is a left view of the internal structure of an integrated high-voltage solid-state soft starting device for mining according to an embodiment of the present invention.

[0035] In all the drawings, the same figure numbers represent the same technical features, specifically: 1-anti-drip guard plate, 2-high-voltage fuse, 3-voltage transformer, 4-upper beam insulator, 5-lightning arrester, 6-incoming call sensor, 7-high-voltage vacuum contactor, 8-current transformer, 9-incoming cable, 10-device room, 11-control panel, 12-thyristor module, 13-insulating baffle, 14-lower beam insulator, 15-outgoing cable, 16-zero sequence transformer, 17-filter, 18-exhaust fan, 19-upper rectangular insulating beam, 20-lower rectangular insulating beam, 21-lower side beam, 22-mounting bolts, 23-upper side beam, 24-plate heater, 25-mounting bracket, 26-copper busbar. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] like Figure 1 and Figure 2 As shown, the high-voltage solid-state soft-start device includes a supporting and protective structure, a lower electrical component, a thyristor module and a device chamber. The supporting and protective structure provides installation support and protection for the internal devices of the high-voltage solid-state soft-start device, and the lower electrical component, the thyristor component and the upper device chamber are respectively arranged in the lower layer, the middle layer and the lower layer of the supporting and protective structure. The function of high-voltage solid-state soft-start is completed by the mutual cooperation of the electrical components arranged therein. The high-voltage solid-state soft-start device provides a soft-start device with excellent voltage and current controllability for mine passages without the danger of gas and dust explosion, which can effectively reduce the cost investment of mining enterprises during the construction period.

[0038] like Figure 1As shown, the support and protection structure includes a support installation unit and an internal environment protection unit. The support installation unit includes a shell composed of anti-corrosion and moisture-proof aluminum-zinc plates, a lower side beam 21, an upper side beam 23 and a mounting bracket 25. Among them, each side of the left and right sides of the shell is spliced ​​into a whole by two aluminum-zinc plates, which are riveted to the surrounding columns with rivets. The surrounding columns are folded in half with aluminum-zinc plates and then folded into a C shape. A pressure relief channel is opened on the top of the shell, and the frame is divided into three layers: the upper layer is the device room, the middle part is equipped with a thyristor module, and the lower layer is equipped with electrical components. The front upper cabinet door is equipped with a soft start controller and a measuring instrument, the outer layer is equipped with a layer of organic glass protective cover, the front lower cabinet door is equipped with an electromagnetic lock to prevent the cabinet door from being opened accidentally with power on, the lower part of the cabinet door is equipped with a ventilation stretching hole, and the part of the cabinet door with the stretching ventilation hole is equipped with a dust filter, the rear upper sealing plate is equipped with an exhaust fan, and the user is used to fan the cabinet body. The upper part of the cabinet body is equipped with a layer of anti-drip protective plate with a slope. The mounting bracket 25 is a rectangular box-shaped structure as a whole. The left end face, right end face and rear end face of the box-shaped structure are double-layer aluminum-zinc plates that are folded in half and then folded into a C shape. The upper end face and the lower end face are riveted on the box-shaped structure by aluminum-zinc plates. The front end face is a door made of aluminum-zinc plates, which is installed at the front end frame of the box-shaped structure. A rectangular hole is opened in the upper part of the front end face to facilitate the installation of the control panel 11. At the same time, an electromagnetic lock is provided at the lower part of the front end face to prevent the cabinet door from being opened by mistake when it is powered on. Two aluminum-zinc plates are respectively provided on the outer sides of the front and rear end faces, which are fixed on the surrounding columns by riveting. Among them, a hole with the same size as the upper part of the door is opened on the aluminum-zinc plate on the upper part of the front end face to facilitate the installation of the control panel 11. The riveting method can provide a good sealing environment for the high-voltage solid-state soft start device, and the selection of aluminum-zinc plates can ensure that the high-voltage solid-state soft start device will not be corroded when working in a humid environment, effectively avoiding the generation of safety hazards. The lower side beams 21 are two horizontal beams arranged from the rear end face of the mounting bracket 25 to its front end face, and the horizontal beams are made of aluminum-zinc plate, and are fixed to the lower inner positions of the left and right end faces of the mounting bracket 25 by bolting, providing effective and stable support for the lower electrical components and controllable silicon components, thereby improving the reliability of the high-voltage solid-state soft start device. The upper side beams 23 are two horizontal beams arranged from the rear end face of the mounting bracket 25 to its front position, and the upper side beams 23 are also made of aluminum-zinc plate, and are fixed to the lower inner positions of the left and right end faces of the mounting bracket 25 by bolting, providing effective and stable support for the controllable silicon components and the upper device chamber, thereby further improving the reliability of the high-voltage solid-state soft start device.

[0039] In addition, the internal environment protection unit includes an anti-drip guard plate 1, an insulating baffle 13, a filter screen 17, an exhaust fan 18 and a plate heater 24. The anti-drip guard plate 1 is arranged on the upper side of the upper end surface of the mounting bracket 25. The anti-drip guard plate 1 is a plate-like structure as a whole, and is arranged on the upper end surface of the mounting bracket 25 in an approximately horizontal direction. The front end of the plate-like structure is folded downward, and then the folded lower end edge of the anti-drip guard plate 1 is welded and fixed to the front upper side edge of the mounting bracket 25 by welding. At the same time, an annular structure for supporting is arranged at the left and right ends between the anti-drip guard plate 1 and the upper end surface of the mounting bracket 25. While supporting the anti-drip guard plate 1, the front end of the anti-drip guard plate 1 is slightly higher than the rear end height, so that water flows along the anti-drip guard plate 1, and then flows down from the rear end surface of the mounting bracket 25, thereby improving the safety and reliability of the high-voltage solid-state soft start device. The exhaust fan 18 is arranged at the upper side of the rear end surface of the mounting bracket 25, and is used to provide effective ventilation for the high-voltage solid-state soft start device and provide a good working environment for the internal electrical components. The insulating baffle 13 is a plate-shaped structure as a whole, fixed to the left and right end surfaces of the mounting bracket 25 by bolts, and is located near the middle position of the front end surface of the mounting bracket 25. When the staff opens the cabinet door, it is used to isolate the staff and the internal electrical components with high voltage, provide protection for the safety of the staff, and improve the safety and reliability of the high-voltage solid-state soft start device. The plate heater 24 is arranged at the bottom position of the right end surface of the mounting bracket 25 by bolt fixing. The temperature and humidity of the internal environment of the high-voltage solid-state soft start device are controlled by the heater 24 to ensure that the internal electrical components provide a suitable working environment. The filter 17 is arranged at the lower position of the front end surface of the mounting bracket 25, and rectangular holes are evenly opened in the rectangular range of this position. The filter 17 is arranged inside the rectangular range to facilitate ventilation of the high-voltage solid-state soft start device.

[0040] like Figure 1As shown, the lower electrical components include a high-voltage vacuum contactor 7, a current transformer 8, an incoming cable 9, an outgoing cable 15, and a zero-sequence transformer 16. Among them, the power incoming cable 9 passes through the current transformer 8 and is connected to a copper bar, the lower end of which is fixed on the incoming call sensor 6, and then led down to the lower end of the high-voltage vacuum contactor 7, the upper end of which is fixed on the insulator 4, and then connected to the high-voltage fuse 2, the other end of which is connected to the incoming end of the voltage transformer 3, and a copper bar is connected between the insulator 4 and the incoming call sensor 6 to the upper end of the thyristor valve group 12, and the upper end of the thyristor module is fixed on the rectangular insulating beam 19. The lower end is fixed on the rectangular insulating beam 20, the rectangular insulating beam 19 and the rectangular insulating beam 20 are respectively fixed on the upper beam 23 and the lower beam 21, the outgoing end of the thyristor valve group 12 is connected to the outgoing copper bar with a copper bar, one section of the outgoing copper bar is connected to the upper end of the high-voltage vacuum contactor 7, and then a small copper bar is connected from the upper end of the high-voltage vacuum contactor 7 to the incoming end of the lightning arrester 5, the other end of the outgoing copper bar is connected to the insulator 14, and the outgoing cable 15 passes through the zero-sequence mutual inductor 16 and is connected to the outgoing copper bar.

[0041] like Figure 1As shown, the controllable silicon assembly includes electrical components on the beam and a thyristor module. Among them, the electrical components on the beam include an upper beam insulator 4, a lightning arrester 5, an incoming call sensor 6 and a lower beam insulator 14. The upper beam insulator 4 is a cylindrical structure, and the upper beam insulator 4 is fixed to the rear side of the left end beam of the upper side beam 23 by bolts, which is used to provide support for the copper bar 26. At the same time, it prevents the three-phase power on the copper bar 26 from leaking from the upper side beam 23, thereby improving the safety of the high-voltage solid-state soft start device. The incoming call sensor 6 is a cylindrical structure as a whole, and the incoming call sensor 6 is horizontally installed inside the front end beam of the lower side beam 21 by bolting, close to the rear side. On the one hand, it is used to provide insulation and support for the copper bar 26, and on the other hand, it monitors whether there is electricity on the incoming line side. Through the cooperation of the voltage transformer 3 and the current transformer 8, the current entering the thyristor module can be accurately calculated, thereby improving the reliability and accuracy of the high-voltage solid-state soft start device. The overall structure of the arrester 5 is a cylindrical structure, which is fixed horizontally by bolts inside the left end beam of the lower beam 21, and is located in front of the incoming call sensor 6. The head end of the arrester 5 is connected to the outlet end of the high-voltage vacuum contactor 7 through the copper bar 26, and the end is connected to the left end beam of the lower beam 21. Under normal voltage conditions, the arrester 5 is not conductive, and only milliampere current is allowed to pass through; when the external three-phase cable is struck by lightning and the voltage rises sharply, the arrester 5 is quickly conductive, which facilitates the introduction of the fault current through the device into the grounded aluminum bar on the front end face of the lower beam 21, and then into the earth through the grounded aluminum bar, which can effectively protect the internal electrical components of the high-voltage solid-state soft start device and further improve the safety and reliability of the high-voltage solid-state soft start device. The lower beam insulator 14 is a cylindrical structure as a whole. The lower beam insulator 14 is arranged on the left end beam of the lower side beam 21. The upper end surface of the beam insulator 14 is fixedly installed on the lower end surface of the front end position of the left end beam of the lower side beam 21 by bolt fixing, so as to provide insulating support for the copper busbar 26.

[0042] In addition, the thyristor module includes a thyristor valve group 12, an upper rectangular insulating beam 19, a lower rectangular insulating beam 20 and a mounting bolt 22. The upper rectangular insulating beam 19 is two beams with a rectangular cross section arranged horizontally from left to right. The two beams of the upper rectangular insulating beam 19 are arranged at the front end of the upper beam 23. At the same time, four bolt holes are arranged in the middle of the two beams of the upper rectangular insulating beam 19, and two bolt holes are arranged on each beam to provide an installation position for the mounting bolt 22. The mounting bolt 22 is a cylindrical bolt-shaped structure as a whole. The mounting bolt 22 extends downward through the bolt hole set in the upper rectangular insulating beam 19 to provide upper end support for the thyristor valve group 12, ensure the stable installation of the thyristor valve group 12, and improve the safety and reliability of the high-voltage solid-state soft start device. The lower rectangular insulating beam 20 is two horizontal beams with rectangular cross sections arranged from left to right. The two beams of the lower rectangular insulating beam 20 are arranged in the middle of the lower side beam 21, between the arrester 5 and the lower beam insulator 14. Bolt holes are arranged in the middle of the two beams of the lower rectangular insulating beam 20, which are in the same position as the bolt holes arranged on the two beams of the upper rectangular insulating beam 19, and are located for the thyristor valve group 12 to be supported by the installation. The thyristor valve group 12 is a vertically arranged rectangular parallelepiped structure as a whole, and the thyristor valve group 12 is fixed between the mounting bolts 22 and the lower rectangular insulating beam 20 by bolt fixing. The inlet end of the thyristor valve group 12 is arranged in the middle of the upper side of the rear end surface of the rectangular parallelepiped structure, and the outlet end is led out from the lower end surface of the rectangular parallelepiped structure. The thyristor valve group 12 controls the gate current of the thyristor inside it, thereby controlling the conduction of the thyristor. At the same time, the control system controls the sequential conduction of the thyristors to gradually increase the current and voltage of the three-phase electricity, thereby achieving the soft start effect and providing a more ideal starting current and voltage for the motor, effectively reducing the cost investment of mining enterprises during the construction period, and improving the economy and reliability of the high-voltage solid-state soft start device.

[0043] like Figure 1 and Figure 2As shown, the upper device chamber includes a high-voltage fuse 2, a voltage transformer 3, a device chamber 10, a control panel 11 and a copper bus 26. Among them, the control panel 11 is a rectangular plate-shaped structure as a whole, and is arranged at a hollow position arranged on the upper front end surface of the mounting bracket 25. Preferably, a layer of organic glass protective cover is arranged on the outer side of the rectangular plate-shaped structure to reduce the risk of accidental electric shock and improve the safety of the high-voltage solid-state soft start device. The control panel 11 is used to control the soft start in real time to ensure the safe operation of the high-voltage solid-state soft start device. The device chamber 10 is a rectangular box-shaped structure as a whole, and the front end surface of the rectangular box-shaped structure can be rotated and opened along its left front end edge. The device chamber 10 is horizontally arranged at the rear of the control panel 11 in the left and right directions, and its left and right end surfaces overlap with the left and right end surfaces of the mounting bracket 25. The device chamber 10 is used to install secondary control elements. The voltage transformer 3 is a horizontally arranged horn-shaped structure as a whole, and the cylindrical structure is a mounting platform flange, a voltage transformer device and a horn device from front to back. A mounting flange is provided at the front end thereof, and the voltage transformer 3 is installed at the middle position of the rear end face of the device chamber 10 by bolt fixing. The voltage transformer device is arranged at the rear end of the mounting flange, and its function is to convert the high voltage into a low voltage. The horn device is a cylindrical rod-shaped structure, which is convenient for introducing the power supply into the voltage transformer 3. The voltage transformer 3 is used to detect the voltage applied to the thyristor valve group 12 and the high-voltage vacuum contactor 7, and then the detection data is transmitted to the control system for processing, so as to improve the accuracy of the high-voltage solid-state soft start device. The high-voltage fuse 2 includes a mounting base and a fuse core, and the mounting base is a rectangular plate-shaped structure, which is installed on the copper bar 26 and the access device of the voltage transformer 3 by bolt fixing. The fuse core is arranged at the upper end of the mounting base. Preferably, the fuse core is made of a material with a large resistance value, a small cross-sectional area and easy to melt. When a fault occurs in the voltage transformer, it can quickly fuse to protect the voltage transformer from damage. The copper bar 26 is a plate-like structure. The copper bar 26 is divided into three sections from the end of the incoming cable 9. The upper copper bar 26 passes through the upper beam insulator 4 and is connected to the access end of the high-voltage fuse 2; the middle copper bar 26 is connected to the incoming end of the rear end of the thyristor valve group 12; the lower copper bar 26 is divided into the lower front copper bar 26 and the lower rear copper bar 26, wherein the lower rear copper bar 26 passes through the incoming call sensor 6 and is connected to the incoming end of the high-voltage vacuum contactor 7; the starting point of the lower rear copper bar 26 is the outlet end of the high-voltage vacuum contactor 7, where it is divided into two directions, one direction is connected to the front side of the lightning arrester 5 upward, and the other direction is horizontally forward and sequentially connected to the lower end outlet end of the thyristor valve group 12, the lower end of the lower beam insulator 14 and the upper end of the outlet cable 15. The copper bar 26 provides a conduction path for the current, ensuring that a mining integrated high-voltage solid-state soft start device can normally complete the soft start work.

[0044] The embodiment of the present invention is an integrated high-voltage solid-state soft start device for mining, and its working principle and implementation steps are as follows:

[0045] Step 1: Before performing a high-voltage solid-state soft start, the electromagnetic lock at the front lower end of the mounting bracket 25 should be unlocked when the power is off, and a preliminary inspection of the high-voltage solid-state soft start device should be performed to eliminate potential safety hazards and ensure the safety of the equipment and personnel.

[0046] Step 2: After the detection is completed, a good working environment is provided for the high-voltage solid-state soft start device by controlling the exhaust fan 18 and the plate heater 24. The three-phase high voltage electricity is connected to the high-voltage solid-state soft start device through the high-voltage incoming cable 9. When working, the control panel 11 issues a working command, and the thyristor valve group 12 gradually conducts after receiving the working command. During the conduction process, the conduction angle of the thyristor is adjusted by the signal fed back by the voltage transformer 3 and the current transformer 8, thereby providing the motor with a stable rising voltage and current, until the motor reaches the rated speed and the high-voltage vacuum contactor 7 is closed, and the starting process is completed.

[0047] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated high-voltage solid-state soft start device for mining, characterized in that: It includes a supporting and protective structure, an upper device module, a thyristor module and a lower electrical component arranged in the supporting and protective structure; wherein, The upper device module comprises a device chamber (10), a high-voltage fuse (2) and a voltage transformer (3) arranged on one side of the device chamber (10), wherein the outlet terminal of the high-voltage fuse (2) is connected to the inlet terminal of the voltage transformer (3); The thyristor module comprises a thyristor valve group (12), an upper beam insulator (4) and an incoming call sensor (6); a copper bar (26) is connected between the upper beam insulator (4) and the incoming call sensor (6) and connected to the incoming line end of the thyristor valve group (12); the incoming call sensor (6) is a cylindrical structure; the incoming call sensor (6) is horizontally mounted inside the supporting protection structure by means of bolt fixing; The lower electrical components include a high-voltage vacuum contactor (7), a current transformer (8), an incoming cable (9), and an outgoing cable (15); the incoming cable (9) passes through the current transformer (8) and is connected to a copper busbar (26); the bottom end of the copper busbar (26) is fixedly connected to the incoming call sensor (6) and then led down to connect to the high-voltage vacuum contactor (7); the top end passes through the upper beam insulator (4) and is connected to the incoming end of the high-voltage fuse (2); the outgoing end of the thyristor valve group (12) is connected to the outgoing cable (15) by means of a copper busbar (26); and the outgoing cable (15) is connected to the high-voltage vacuum contactor (7).

2. The integrated high-voltage solid-state soft start device for mining according to claim 1 is characterized in that: The support and protection structure comprises a support installation unit, wherein the support installation unit comprises an outer shell composed of anti-corrosion and moisture-proof aluminum-zinc coated plates, a lower side beam (21), an upper side beam (23) and a mounting bracket (25); The housing is sleeved on the mounting bracket (25), and is divided into three layers: upper, middle and lower. The upper layer is used to mount the upper device module, the middle layer is used to mount the thyristor module, and the lower layer is used to mount the electrical components. The upper beam (23) is arranged at the bottom of the upper device module, and the lower beam (21) is arranged at the bottom of the thyristor module.

3. The integrated high-voltage solid-state soft start device for mining according to claim 2, characterized in that: The left and right sides of the shell are respectively composed of two pieces of aluminum-zinc coated plates, which are spliced ​​into a whole and riveted to the mounting brackets (25) on all sides. The mounting brackets (25) on all sides are folded in half by the aluminum-zinc coated plates to form a C-shaped structure.

4. The integrated high-voltage solid-state soft start device for mining according to claim 2, characterized in that: The supporting protection structure comprises an internal environment protection unit, wherein the internal environment protection unit comprises an anti-drip protection plate (1) and an insulating baffle (13); The anti-drip guard plate (1) is a plate-shaped structure and is arranged on the top of the mounting bracket (25); The insulating baffle (13) is a plate-shaped structure and is fixed to a side surface of the mounting bracket (25) by means of bolts.

5. The integrated high-voltage solid-state soft start device for mining according to claim 4, characterized in that: The internal environment protection unit comprises a filter (17) and an exhaust fan (18); The filter screen (17) is arranged at a corner of the bottom of the housing; The exhaust fan (18) is arranged on one side of the top of the housing.

6. The integrated high-voltage solid-state soft start device for mining according to claim 4, characterized in that: The internal environment protection unit comprises a plate heater (24), and the plate heater (24) is arranged on one side surface of the bottom of the outer shell.

7. The integrated high-voltage solid-state soft start device for mining according to claim 2, characterized in that: The thyristor module comprises a lower beam insulator (14), the top of which is fixedly connected to the lower beam (21), and the other end of which is connected to a copper busbar (26).

8. The integrated high-voltage solid-state soft start device for mining according to claim 2, characterized in that: The thyristor module comprises an upper rectangular insulating crossbeam (19) and a lower rectangular insulating crossbeam (20); The top of the thyristor valve group (12) is fixedly connected to the upper rectangular insulating cross beam (19) via mounting bolts (22), and the bottom is fixedly connected to the lower side beam (21) via a lower rectangular insulating cross beam (20).

9. The integrated high-voltage solid-state soft start device for mining according to claim 2, characterized in that: The lower electrical component comprises a zero-sequence transformer (16), which is fixed on a mounting bracket (25), and the outlet cable (15) passes through an inner hole of the zero-sequence transformer (16).

10. The integrated high-voltage solid-state soft start device for mining according to claim 2, characterized in that: The upper device module comprises a control panel (11), which is arranged at the upper front part of the housing.

Images