CN114530858B - Quick pressure regulating system of coal mine excavation site overhead line - Google Patents

Abstract

The application discloses a rapid pressure regulating system for an overhead line of a coal mine mining field, which comprises a regulating unit, an energy supply unit and a connecting unit, wherein the regulating unit comprises a compensating transformer connected to a bus, a bypass power supply connected to the input end of the compensating transformer, and a power unit cabinet connected to the input end of the bypass power supply, and the input end of the compensating transformer is connected with a current transformer; the energy supply unit comprises an energy supply transformer connected between the bus and the power unit cabinet and a circuit breaker connected to the output end of the energy supply transformer; a connection unit; the voltage regulating system can stabilize load voltage and eliminate three-phase unbalance of system voltage; the system stability and the power transmission capability can be improved; the electric energy quality problems such as power grid voltage fluctuation, voltage harmonic waves and the like can be eliminated; the response speed is high, the operation range is wide, and the voltage stability can be ensured at any time; the power unit fault can automatically switch the bypass operation state, and the continuity of the power supply of the later stage is ensured.

Description

A rapid voltage regulation system for overhead lines in coal mine excavation sites

Technical field

The invention relates to the technical field of distribution line voltage regulation, and in particular to a rapid voltage regulation system for overhead lines in coal mine mining sites.

Background technique

The open-pit coal mine excavation site uses a 35kV overhead ring pit line as the main trunk, and a 35/6.3kV mobile substation is arranged around the pit. The 6kV cable line is fed from the substation to distribute power to the excavators on each mining and stripping working platform. Because the upper power supply of the 35kV power distribution system is unstable (Voltage fluctuation range is 33500V~37500V). Large coal mine excavators have frequency conversion control systems and are particularly sensitive to power supply. For example, the WK-20 excavator uses Siemens AC-DC-AC frequency conversion control system. The network voltage directly acts on the power electronic devices. If the voltage is too high, If it is too low, it will cause the PLC secondary control components to burn out. The normal operation of large coal mine excavators requires stable power supply.

Defects or shortcomings in the existing technology: 1. Adjustment of the tap changer of the 35/6.3kV mobile substation requires a power outage in the substation. After adjustment, preventive testing of the transformer is required, which affects the continuity of power supply; 2. 35/6.3kV mobile substation Frequent adjustment of the tap changer will increase the resistance of the poor contact point and increase the heat. Over time, the temperature will rise, which may burn out the winding, and also cause the transformer loss to increase. In addition, when adjusting and compensating from overhead lines, there are connection stability and safety issues in the connection between the busbar and branch lines, which need to be resolved.

Contents of the invention

The purpose of this section is to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, the abstract and the title of the invention to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the invention.

In view of the above-mentioned problems existing in the voltage regulation of overhead lines in existing coal mine excavation sites, the present invention is proposed.

Therefore, the purpose of the present invention is to provide a rapid voltage regulation system for overhead lines in coal mines, which aims to solve the problems of unstable power supply of the distribution system and difficulty in connecting the voltage regulation system and busbars in overhead lines in coal mines.

In order to solve the above technical problems, the present invention provides the following technical solution: a rapid voltage regulation system for overhead lines in coal mine excavation sites. This voltage regulation system includes a regulating unit, an energy supply unit and a connecting unit. The regulating unit includes a regulating unit connected to a busbar. A compensation transformer on the computer, a bypass power supply connected to the input end of the compensation transformer, and a power unit cabinet connected to the input end of the bypass power supply, the input end of the compensation transformer is connected to a current transformer; an energy supply unit, which includes a power supply transformer connected between the busbar and the power unit cabinet and a circuit breaker connected to the output end of the power supply transformer; and a connection unit including a first wire harness assembly and a second wire harness assembly, the third wire harness assembly being A wire harness assembly is connected to the busbar, and the second wire harness assembly is connected to the input end of the energy supply transformer.

As a preferred solution of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention, it also includes a protection unit, which includes a high-voltage bypass switch connected in parallel to the input side and the output side of the busbar, and a high-voltage bypass switch connected in series to the busbar. The high-voltage input switch on the input side and the high-voltage output switch on the output side of the busbar are connected in series; the regulating unit and the energy supply unit are connected in parallel in the area between the input side and the output side of the busbar; the input side of the busbar is also connected There is a voltage transformer.

As a preferred solution of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention, the protection unit also includes a grounding protection piece, and the grounding protection piece is respectively connected to the input side and output side lines of the busbar. Above; the grounding protection component includes a grounding switch and an overcurrent protector connected in parallel to the grounding switch line.

As a preferred solution of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention, the connection unit further includes a connecting pipe assembly, and the connecting pipe assembly includes an installation pipe and a third pipe disposed in the installation pipe. A conductor and a second conductor, as well as a limiting member fitted on the installation tube; the limiting member is cooperatively connected to the second conductor.

As a preferred solution of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention, the two ends of the installation pipe are connected through each other, and an external thread groove is provided on the outer wall of the pipe body, and the side walls of the pipe body are symmetrical. A strip chute is provided, and the strip chute is distributed parallel to the axis of the installation pipe.

As a preferred solution of the rapid voltage regulation system for overhead lines in coal mine excavation sites of the present invention, one end of the first conductor is provided with a wiring slot, and the other end is provided with a conductive protrusion; the second conductor is One end is provided with a conductive slot, and the other end is provided with an arc-shaped conductive block; the conductive protrusion can be inserted into the conductive slot, and its radial length is greater than the radial depth of the conductive slot.

As a preferred solution of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention, the limiter includes a limiter pipe slidably sleeved on the outer wall of the installation pipe, and a The insulating tube on the outer wall of the two conductors and the connecting column symmetrically arranged between the limiting tube and the side wall of the insulating tube; a deflection rod is hinged on the side wall of the end of the limiting tube away from the connecting column; An elastic member is provided between the insulating tube and the inner cavity mouth of the installation pipe. The elastic member is sleeved on the outer wall of the second conductor; the connecting column is slidably limited in the strip chute.

As a preferred solution of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention, the limit member further includes a limit ring, and the limit ring is cooperatively connected to the external thread groove, and Its end can contact the end of the limiting tube away from the deflection rod.

As a preferred solution of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention, the first beam line assembly includes a first arc-shaped splint and a second arc-shaped splint arranged symmetrically. One end of the arc-shaped splint and the second arc-shaped splint is arranged on the end side wall of the installation pipe through a hinge seat; and an arc-shaped groove is provided in the arc-shaped cavity of the two; the arc-shaped conductive block can be accommodated in the inside the arc-shaped groove.

As a preferred solution of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention, the second wire harness assembly includes several sets of clamping blocks, one end of each of the clamping blocks is hinged to the installation The end side wall of the tube away from the first wire harness assembly, and the end of the deflection rod away from the limiting tube is hinged to the middle side wall of the clamping block.

Beneficial effects of the present invention:

The voltage regulating system of the present invention can stabilize the load voltage and eliminate the three-phase imbalance of the system voltage; it can improve system stability and power transmission capacity; it can eliminate power quality problems such as power grid voltage fluctuations and voltage harmonics; it can respond quickly and has a wide operating range. It can ensure voltage stability at all times; when the power unit fails, it can automatically switch to the bypass operating state to ensure the continuity of power supply to the subsequent stages; the power unit adopts modular parallel connection, which greatly reduces the size of the equipment with the same capacity, has a simple structure and is easy to maintain; in addition, through The new line connection unit has the characteristics of convenient connection, safety and stability.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting any creative effort. in:

Figure 1 is an overall electrical schematic diagram of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention.

Figure 2 is a specific connection schematic diagram of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention.

Figure 3 is a schematic diagram of the connection scene of the connection unit of the rapid voltage regulation system for overhead lines in coal mine mining sites according to the present invention.

Figure 4 is a schematic three-dimensional structural diagram of the connection unit of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention.

Figure 5 is a schematic cross-sectional structural diagram of the connection unit in the initial state of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention.

Figure 6 is a schematic structural diagram of the connection state of the connection unit of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention.

Figure 7 is a schematic cross-sectional view of the connection state of the connection unit of the rapid voltage regulation system for overhead lines in coal mine excavation sites according to the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention will be described in detail below with reference to the accompanying drawings.

Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Those skilled in the art can do so without departing from the connotation of the present invention. Similar generalizations are made, and therefore the present invention is not limited to the specific embodiments disclosed below.

Second, reference herein to "one embodiment" or "an embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

Next, the present invention will be described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples and should not be used here. Limit the scope of protection of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual production.

Example 1

Referring to Figures 1 and 2, a first embodiment of the present invention provides a rapid voltage regulation system for overhead lines in a coal mine. The voltage regulation system includes a regulation unit 100, an energy supply unit 200, a connection unit 300 and a protection unit 400. , among which, the open-pit coal mine excavation site has a 35kV overhead ring pit line as the main trunk, a 35/6.3kV mobile substation is arranged in the ring pit, and the 35kV distribution line supplies power to the load. When voltage fluctuations occur in the distribution line system, the regulating unit 100 is used for the line Dynamic adjustment of system voltage, and the energy supply unit 200 is used to compensate electric energy to the adjustment unit 100, and the protection unit 400 is used to protect the circuit of the voltage regulation system; the connection unit 300 is a new type of line connector, used for busbars and branch lines Line connections to improve the convenience, safety and stability of connections between lines.

The regulating unit 100 includes a compensation transformer 101 connected to the bus L, a bypass power supply 102 connected to the input end of the compensation transformer 101, and a power unit cabinet 103 connected to the input end of the bypass power supply 102. The input end of the compensation transformer 101 is connected to Current transformer 101a; among them, the power unit cabinet 103, the bypass power supply 102 and the compensation transformer 101 have one-way output and are connected to the bus L to adjust the voltage abnormality appearing on the bus L. The power supply 102 provides the required electric energy, and the bypass power supply 102 compensates the reserved electric energy into the bus L through the compensation transformer 101. The current transformer 101a is used for current collection on the secondary side of the transformer to monitor the compensation situation of the adjustment unit 100.

The energy supply unit 200 includes an energy supply transformer 201 connected between the bus bar L and the power unit cabinet 103 and a circuit breaker 202 connected to the output end of the energy supply transformer 201;. The energy supply unit 200 is used to compensate electric energy to the functional unit cabinet 103, and the circuit breaker 202 is used for circuit break protection of the energy supply transformer 201.

The connection unit 300 includes a first wire harness assembly 301 and a second wire harness assembly 302. The first wire harness assembly 301 is connected to the bus bar L, and the second wire harness assembly 302 is connected to the input end of the energy supply transformer 201; wherein, The first wire harness assembly 301 is connected to the busbar L, and the second wire harness assembly 302 is connected to the input terminals of the energy supply transformer 201 and other lines. The two wire harness assemblies are internally connected to realize the connection between the busbar L and other branches.

It also includes a protection unit 400, which includes a high-voltage bypass switch 401 connected in parallel to the input side and the output side of the bus L, a high-voltage input switch 402 connected in series to the input side of the bus L, and a high-voltage output switch 403 connected in series to the output side of the bus L; a regulating unit 100 and the energy supply unit 200 are connected in parallel in the area between the input side and the output side of the bus L; the input side of the bus L is also connected to a voltage transformer D.

The protection unit 400 also includes a grounding protection component 404, which is connected to the input side and output side lines of the bus L respectively; the grounding protection component 404 includes a grounding switch 404a and an overcurrent protector 404b connected in parallel to the line of the grounding switch 404a. .

A high-voltage input switch 302 and a high-voltage output switch 303 are connected in series on both sides of the line where the regulating unit 100 and the energy supply unit 200 are connected to the bus L to form a compensation area, and a high-voltage bypass switch 301 is also connected outside the compensation area. Used for circuit protection. The connected voltage transformer D is used for real-time monitoring of the voltage of bus L to achieve accurate compensation.

The input terminals of the compensation transformer 101, the energy supply transformer 201 and the grounding switch 404a are all connected to the bus bar L through the connection unit 300. Since each branch is connected to the main bus L through conductors in a T-shaped structure, the connection unit 300 adapted to this shape is used for quick connection.

Combined with what is shown in Figures 1 to 2, this voltage regulation system can quickly compensate for system voltage fluctuations and stabilize the load voltage. The control process is to monitor the line voltage of the 35kV bus in real time through the current transformer 101a and the voltage transformer D. When the system voltage does not meet the requirements, the power unit cabinet 103 outputs the same voltage as the system phase through the bypass power supply 102, and compensates The transformer 101 is coupled with the 35kV system voltage to stabilize the load terminal voltage. In the same way, when the actual output voltage is high, the voltage with a certain phase difference between the output of the regulating unit 100 and 35kV is coupled through the transformer to make the output voltage meet the standard. When there are certain harmonics in the system voltage, the regulating unit 100 will output the same voltage. Harmonic voltages in opposite directions cancel them. This voltage regulating system is used for one-way lines and can also be used for dynamic compensation of three-phase voltage imbalance.

Example 2

Referring to Figures 3 to 7, a second embodiment of the present invention is shown. The difference between this embodiment and the first embodiment is that the connection unit 300 also includes a connecting pipe assembly 303. The connecting pipe assembly 303 includes an installation pipe 303a, a The first conductor 303b and the second conductor 303c in the installation tube 303a, and the limiting member 303d cooperatively set on the installation tube 303a; the limiting member 303d is cooperatively connected to the second conductor 303c.

The two ends of the installation pipe 303a are connected, and an external thread groove 303a-1 is provided on the outer wall of the pipe body. A strip chute 303a-2 is symmetrically provided on the side wall of the pipe body. The strip chute 303a-2 is parallel to the installation pipe. Axis distribution of tube 303a.

One end of the first conductor 303b is provided with a wiring slot 303b-1, and the other end is provided with a conductive protrusion 303b-2; wherein, the wiring slot 303b-1 is used to connect the end of the branch cable, and connect the end of the cable to The core end is inserted, and then the second wire harness assembly 302 is used to clamp the insulation layer of the cable to achieve a stable connection. One end of the second conductor 303c is provided with a conductive slot 303c-1, and the other end is provided with an arc-shaped conductive block 303c-2, wherein the arc-shaped conductive block 303c-2 is used to fit on the side wall of the exposed bus bar L, and Cooperate with the first wire harness component 301 to stably cover the outer wall of the bus bar L to achieve connection; the conductive protrusion 303b-2 can be fit and inserted into the conductive slot 303c-1, and its radial length is larger than the conductive slot 303c -1 radial depth. The purpose is that when the first conductor 303b is plug-connected to the second conductor 303c, they must be able to maintain circuit communication between the two.

The limiting member 303d includes a limiting tube 303d-1 slidably sleeved on the outer wall of the installation tube 303a, an insulating tube 303d-2 covering the outer wall of the second conductor 303c, and symmetrically arranged on the limiting tube 303d-1 and The connecting post 303d-3 between the side walls of the insulating tube 303d-2; the deflection rod 303d-4 is hinged on the side wall of the end of the limiting tube 303d-1 away from the connecting post 303d-3; the insulating tube 303d-2 and the installation tube 303a An elastic member 303d-5 is provided between the inner cavity openings, and the elastic member 303d-5 is sleeved on the outer wall of the second conductor 303c; the connecting column 303d-3 is slidably limited in the strip chute 303a-2.

The limiter 303d also includes a limiter ring 303d-6. The limiter ring 303d-6 is cooperatively connected to the external thread groove 303a-1, and its end can be away from the deflection rod 303d-4 from the limiter tube 303d-1. Contact at one end.

The first wire harness assembly 301 includes a symmetrically arranged first arc-shaped clamping plate 301a and a second arc-shaped clamping plate 301b. One end of the first arc-shaped clamping plate 301a and the second arc-shaped clamping plate 301b is arranged at the end of the installation tube 303a through a hinge seat 301c. on the side walls of the two parts; and an arc-shaped groove H is provided in the arc-shaped cavity of the two; the arc-shaped conductive block 303c-2 can be accommodated in the arc-shaped groove H. Among them, the movements of the first arc-shaped clamping plate 301a and the second arc-shaped clamping plate 301b are controlled by the telescopic position of the arc-shaped conductive block 303c-2. They deflect around their respective hinge points and can finally be hugged on the outer wall of the bus bar L. on, or separated from each other to form the opening shape in the initial state.

The second wire harness assembly 302 includes several sets of clamping blocks 302a. One end of each clamping block 302a is hinged to the end side wall of the installation tube 303a away from the first wire harness assembly 301, and the deflection rod 303d-4 is away from the limit. One end of the tube 303d-1 is hinged to the middle side wall of the clamping block 302a. The shapes of each group of clamping blocks 302a may be the same or different. In this embodiment, the same structure is taken as an example for description. Specifically, one end of each clamping block 302a is hinged, and the other end is a free end that can rotate around the hinge point. One end of the deflection rod 303d-4 is hinged on the middle side wall of the clamping block 302a, thereby limiting the deflection. The deflectable range of rod 303d-4. It should be noted that, in order to facilitate each group of clamping blocks 302a to be stably clamped on the outer wall of a branch cable, the side walls of each group of clamping blocks 302a that contact the cable can be adapted.

Compared with Embodiment 1, further, the connecting pipe assembly 303 is the main body assembly of the connecting unit 300, and the first wire harness assembly 301 and the second wire harness assembly 302 are distributed at both ends; specifically, the installation pipe 303a is a connecting pipe. The main shell part of the component 303 is a tubular structure with a hollow interior and two ends that pass through. The first conductor 303b and the second conductor 303c cooperate and slide in the inner cavity of the installation tube 303a, and the two can be plugged and connected into one body; The limiting member 303d is a limiting structure of the connecting tube assembly 303, and is used to clamp and restrain the wires by the first wire harness assembly 301 and the second wire harness assembly 302.

Furthermore, the external thread groove 303a-1 is provided at one end of the installation pipe 303a where the first conductor 303b is installed, and is an indented groove. The purpose of the indentation is not to affect the position of the limiting pipe 303d-1 outside the installation pipe 303a. Sliding, and itself is used to limit the position of the limiting ring 303d-6; thereby limiting the position of the limiting tube 303d-1. The strip chute 303a-2 is distributed in a strip shape along the axial side wall of the installation pipe 303a, with at least two symmetrical ones, penetrating the inner cavity and outer side wall of the installation pipe 303a, and used for the installation and limiting of the connecting column 303d-3. .

Further, the limiting tube 303d-1 and the insulating tube 303d-2 are two independent ring tubes, wherein the insulating tube 303d-2 is located in the inner cavity of the installation tube 303a and is wrapped on the outer wall of the second conductor 303c. , and the limiting pipe 303d-1 is located in the outer cavity of the installation pipe 303a, and is sleeved on the outer wall of the installation pipe 303a; one end of the connecting column 303d-3 is connected to the inner wall of the limiting pipe 303d-1, and the other end is connected to the insulating On the outer wall of the tube 303d-2, due to the existence of the strip chute 303a-2, that is, the sliding range of the limiting tube 303d-1 and the insulating tube 303d-2 is the length of the strip chute 303a-2.

Furthermore, the other end of the limiting tube 303d-1 has a deflection rod 303d-4, and through deflection, the state of the second wire harness assembly 302 is changed. The elastic member 303d-5 is used to maintain the connection unit 300 to return to the initial state after use, and generally a spring can be used; the movable range of the limiting ring 303d-6 is the axial distribution range of the external thread groove 303a-1. In the clamping or releasing state of limiting or releasing the connection unit 300.

The rest of the structure is the same as that of Embodiment 1.

As shown in Figures 3 to 7, in the initial state of the connection unit 300, due to the existence of the elastic member 303d-5, the second conductor 303c is pulled to one side of the first harness assembly 301. At this time, the first The conductor 303b and the second conductor 303c are separated from each other, and the first arc-shaped clamping plate 301a and the second arc-shaped clamping plate 301b of the first harness assembly 301 are in an open state to facilitate the insertion of the clamping on the bus bar L; while at the same time, the connecting column 303d Under the synchronization effect of -3, the limiting tube 303d-1 is at the top (the side close to the first wire harness assembly 301 in the plane of the drawing), causing the deflection rod 303d-4 to deflect, and pulling each clamping block 302a to deflect, so that The entire second wire harness assembly 302 is in an open state to facilitate the insertion of branch cables. At this time, the limiting ring 303d-6 has no contact with or is above the end of the limiting tube 303d-1.

After the bus bar L and branch cables are placed, rotate the limit ring 303d-6 to approach or squeeze the side wall of the limit tube 303d-1, so that it slides down along the wall of the installation tube 303a, by pushing the deflection rod 303d -4 deflection, so that the second wire harness assembly 302 is in a closed state as a whole; and the limiting tube 303d-1 drives the insulating tube 303d-2 to slide towards the inner cavity of the installation tube 303a through the connecting column 303d-3, that is, the second conductor 303c moves towards the installation tube. The inner cavity of the tube 303a slides and is finally plugged and matched with the end of the first conductor 303b to form an integral body; during the sliding process of the second conductor 303c, the elastic member 303d-5 is stretched, and the arc-shaped conductive block 303c-2 at its end It is gradually fit and stored in the arc-shaped groove H, and the first arc-shaped clamping plate 301a and the second arc-shaped clamping plate 301b are moved to deflect, and finally cover the outer wall of the bus bar L. Finally, under the action of the limiting ring 303d-6, a stable connection state is maintained.

When the connection unit 300 needs to be dismantled, the limiting ring 303d-6 only needs to be rotated in the reverse direction to release the restriction on the limiting tube 303d-1. Under the action of the elastic member 303d-5, the first wire harness assembly 301 And the second wire harness assembly 302 can be restored to the initial open state in preparation for reuse.

It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solution of the present invention can be carried out. Modifications or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention shall be included in the scope of the claims of the present invention.

Claims (2)

1. A rapid voltage regulation system for overhead lines in coal mines, which is characterized by: including, The regulating unit (100) includes a compensation transformer (101) connected to the bus bar (L), a bypass power supply (102) connected to the input end of the compensation transformer (101), and a bypass power supply (102) connected to the input end of the compensation transformer (101). ) The power unit cabinet (103) at the input end, the input end of the compensation transformer (101) is connected to a current transformer (101a); Energy supply unit (200), which includes an energy supply transformer (201) connected between the busbar (L) and the power unit cabinet (103) and a circuit breaker (202) connected to the output end of the energy supply transformer (201) ); The connection unit (300) includes a first wire harness assembly (301) and a second wire harness assembly (302). The first wire harness assembly (301) is connected to the bus bar (L), and the second wire harness assembly (302) The harness assembly (302) is connected to the input end of the energy supply transformer (201); and, Protection unit (400), which includes a high-voltage bypass switch (401) connected in parallel to the input side and output side of the bus (L), a high-voltage input switch (402) connected in series to the input side of the bus (L), and a series A high-voltage output switch (403) on the output side of the bus bar (L); The protection unit (400) also includes a grounding protection piece (404), which is connected to the input side and output side lines of the bus bar (L) respectively; the grounding protection piece (404) It includes a grounding switch (404a) and an overcurrent protector (404b) connected in parallel to the grounding switch (404a) line; The connection unit (300) also includes a connection pipe assembly (303). The connection pipe assembly (303) includes an installation pipe (303a), a first conductor (303b) disposed in the installation pipe (303a), and a third conductor (303b). The two conductors (303c), and the limiting member (303d) that is cooperatively mounted on the installation pipe (303a); the limiting member (303d) is cooperatively connected to the second conductor (303c); The two ends of the installation pipe (303a) are connected, an external thread groove (303a-1) is provided on the outer wall of the pipe body, and a strip chute (303a-2) is symmetrically provided on the side wall of the pipe body. The chute (303a-2) is distributed parallel to the axis of the installation pipe (303a); One end of the first conductor (303b) is provided with a wiring slot (303b-1), and the other end is provided with a conductive protrusion (303b-2); One end of the second conductor (303c) is provided with a conductive slot (303c-1), and the other end is provided with an arc-shaped conductive block (303c-2); the conductive protrusion (303b-2) can be plugged into the Within the conductive slot (303c-1), and its radial length is greater than the radial depth of the conductive slot (303c-1) The limiting member (303d) includes a limiting tube (303d-1) slidably sleeved on the outer wall of the installation tube (303a), and an insulating tube covering the outer wall of the second conductor (303c). (303d-2), the connecting column (303d-3) symmetrically arranged between the side wall of the limiting tube (303d-1) and the insulating tube (303d-2); the limiting tube (303d-1) A deflection rod (303d-4) is hinged on the side wall of one end away from the connecting column (303d-3); an elastic spring is provided between the insulating tube (303d-2) and the inner cavity mouth of the installation tube (303a). (303d-5), the elastic member (303d-5) is sleeved on the outer wall of the second conductor (303c); the connecting column (303d-3) is slidably limited to the strip chute (303d-5). 303a-2); The limiter (303d) also includes a limiter ring (303d-6). The limiter ring (303d-6) is cooperatively connected to the external thread groove (303a-1), and its end can Contact with the end of the limiting tube (303d-1) away from the deflection rod (303d-4); The first wire harness assembly (301) includes a symmetrically arranged first arc-shaped splint (301a) and a second arc-shaped splint (301b). ) is set on the end side wall of the installation tube (303a) through the hinge seat (301c); and an arc-shaped groove (H) is provided in the arc-shaped cavity of the two; The arc-shaped conductive block (303c-2) can be accommodated in the arc-shaped groove (H); The second wire harness assembly (302) includes several sets of clamping blocks (302a), one end of each clamping block (302a) is hinged to the installation tube (303a) away from the first wire harness assembly (302a). 301) on the end side wall, and the end of the deflection rod (303d-4) away from the limiting tube (303d-1) is hinged on the middle side wall of the clamping block (302a). 2. The rapid voltage regulation system for overhead lines in coal mines according to claim 1, characterized in that: the regulating unit (100) and the energy supply unit (200) are connected in parallel to the input side and the output side of the busbar (L) the area between; A voltage transformer (D) is also connected to the input side of the busbar (L).