A reactive compensation device for eliminating harmonics in power transmission system

Abstract

The present invention discloses a reactive power compensation device for eliminating harmonics in a power transmission system, comprising a main support, an adjusting capacitor fixedly mounted on the bottom of the main support, and an inductor fixedly mounted on the upper end of the main support; a base is provided at the lower end of the main support, and a bottom line groove is provided at the lower end of the base, a bottom line with three-way branches is fixedly connected in the middle of the bottom line groove; a lower support plate with a plate-like structure is fixedly connected to the upper end of the base, and three capacitor mounting holes are evenly distributed in the middle of the lower support plate; by adjusting the capacitance value of the adjusting capacitor, the adjusting capacitor, the inductor and the fixed capacitor can be made into harmonic filters of different sizes, without the need to use multiple harmonic filters for assembly, thereby reducing the increase in reactive power and improving the effect of reactive power compensation; by adjusting the adjusting capacitor, the entire device is set within a high-voltage or low-voltage usage range, thereby increasing the applicability of the entire device.

Description

Technical Field

[0001] The present invention relates to the technical field of improving power systems, and in particular to a reactive power compensation device for eliminating harmonics in a power transmission system. Background Art

[0002] Transmission systems transmit electricity to substations at the same or lower levels. They typically use high voltage transmission and operate with fixed-frequency, sinusoidal voltage and current waveforms. However, when nonlinear loads such as thyristor rectifiers, inverters, and arc furnaces are connected to the system, they generate significant harmonic currents, leading to voltage and current distortion. Harmonics reduce the efficiency of energy production, transmission, and utilization, causing electrical equipment to overheat, generate vibration and noise, and age insulation, shortening its service life and even causing failure or burnout. Harmonics can induce local parallel or series resonance in the power system, amplifying harmonic content and damaging equipment such as capacitors. Harmonics can also cause malfunctions in relay protection and automatic devices, disrupting energy metering. Externally, harmonics can severely interfere with communications and electronic equipment. Furthermore, many load components in the transmission system generate significant reactive power, which results in significant losses.

[0003] In order to eliminate the damage caused by harmonics and the loss of reactive power, harmonic filters with reactive power compensation have been developed in the prior art. While they have solved some of the harmonic problems in power transmission systems to a certain extent, they still have the following drawbacks in actual use:

[0004] 1. The adjustment range of harmonic filters in the prior art is a predetermined adjustment range. However, when harmonic filters of different specifications are required, the filtering function is usually achieved by connecting multiple filters in series or in parallel, thereby increasing the filtering cost.

[0005] 2. The filter in the prior art has a filtering range divided into high-voltage filtering and low-voltage filtering, which are not universal, thus limiting the application range of the filter to a certain extent. Summary of the Invention

[0006] The object of the present invention is to provide a reactive power compensation device for eliminating harmonics in a power transmission system, so as to solve the technical defects of the harmonic filter in the prior art proposed in the above background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a reactive power compensation device for eliminating harmonics in a power transmission system, comprising a main support, an adjusting capacitor and an inductor mounted on the main support, a base being provided at the lower end of the main support, a bottom line groove being provided at the lower end of the base, a bottom line with three branches being provided on the bottom line groove, a lower support plate of a plate-like structure being provided at the upper end of the base, three capacitor mounting holes being arranged in the middle of the lower support plate, and adjusting capacitors being inserted into the capacitor mounting holes; support columns I are respectively provided at the four corners of the upper end surface of the lower support plate, an upper support plate of a plate-like structure is connected to the upper end of the support column I, three inductors are mounted on the upper end surface of the upper support plate, two terminal posts I are provided at the upper end of the inductors, three fixed capacitors are mounted on the upper end of the upper support plate and on the inner side surrounded by the three inductors, two terminal posts II are provided at the upper end of the fixed capacitors, sleeved wires are installed on the terminal posts I and the terminal posts II, and an external wire is plugged and connected to the terminal post I.

[0008] Furthermore, the main body of the regulating capacitor is a fixed tube with a tubular structure, a fixing groove with a slot structure is provided at the bottom of the fixed tube, an electrode plate I with a plate structure is installed in the fixed groove, and a guide sleeve I is provided in the middle of the electrode plate I, a screw is passed through the guide sleeve I, and a wire insertion groove connected to the bottom line is provided on the lower end face of the electrode plate I, a limiting ring with an annular boss structure is provided in the middle of the fixed tube and on the inner wall of the fixed tube, two guide grooves with a slot structure are provided in the wall of the fixed tube and along the axial direction of the fixed tube, an electrode plate II with a plate structure is mounted on the upper end of the inner wall of the fixed tube, two guide blocks that slide in the guide groove are symmetrically provided on the outer side of the electrode plate II, the electrode plate II is screwed to the screw, a connecting wire is connected to the upper end of the electrode plate II, and the other end of the connecting wire is connected to the terminal I.

[0009] Preferably, a spacer with a triangular slot structure is provided between the inductor and the fixed capacitor and on the upper end surface of the upper support plate, and a guide column is provided in the middle of the spacer and on the upper end surface of the upper support plate.

[0010] Preferably, four support columns II are symmetrically provided at the four corners of the upper end surface of the upper support plate, and connecting holes are provided at the upper ends of the support columns II.

[0011] Preferably, an outer cover of a shell structure is provided on the outer side of the lower support plate and the upper support plate, the lower end of the outer cover is connected to the base through a fixing bolt II, and four mounting holes are provided at the upper end of the outer cover and at corresponding positions of the connecting holes, and the mounting holes are provided with fixing bolts I that are screwed to the connecting holes.

[0012] Preferably, a guide hole adapted to the guide column is provided in the middle of the upper end surface of the outer cover, and two lifting ears are fixedly connected on both sides of the guide hole and on the upper end surface of the outer cover, and three wire holes adapted to pass through external wires are provided on the upper end surface of the outer cover and on one side of the lifting ear.

[0013] Preferably, a fixing plate with a plate-like structure is provided in an annular direction around the lower end of the fixing tube, and the fixing plate and the lower support plate are fixedly connected together by connecting bolts I.

[0014] Preferably, an end cover of a shell structure is provided at the upper end of the fixed tube, and the end cover is fitted with the screw rod.

[0015] Preferably, the lower end of the bottom line groove is provided with a sewing opening of a groove structure in an annular direction, and a sealing plate of a plate structure is clamped in the sewing opening.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. By adjusting the size of the regulating capacitor, the regulating capacitor, inductor and fixed capacitor can form harmonic filters of different sizes. There is no need to use multiple harmonic filters for assembly, thus reducing costs, reducing the increase in reactive power and improving the effect of reactive power compensation;

[0018] 2. By adjusting the capacitance, the entire device is set to a high voltage or low voltage operating range, thereby increasing the applicability of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an exploded view of the structure of the present invention from the axial side;

[0020] Figure 2 for Figure 1 A magnified schematic diagram of the local structure at center A;

[0021] Figure 3 This is a half-section axonometric structural view of the present invention;

[0022] Figure 4 This is the top view of the main support axis;

[0023] Figure 5 This is the main support axis side elevation view;

[0024] Figure 6 To adjust the capacitance axis side structure view;

[0025] Figure 7 for Figure 6 Schematic diagram of the cross-section structure at the middle BB;

[0026] Figure 8 for Figure 6Schematic diagram of the cross-sectional structure at CC.

[0027] In the figure: 1. Main frame; 2. Adjustable capacitor; 3. Inductor; 4. Fixed capacitor; 5. Socketed wire; 6. External wire; 7. Outer cover; 8. Closing plate; 101. Base; 102. Lower support plate; 103. Capacitor mounting hole; 104. Support column I; 105. Upper support plate; 106. Support column II; 107. Connecting hole; 109. Spacer; 110. Guide column; 111. Bottom line groove; 112. Sewing opening; 113. Bottom line; 201. Fixing plate; 202. Connecting bolt I; 203, fixing tube; 204, fixing groove; 205, electrode plate I; 206, wire insertion groove; 207, guide sleeve I; 208, limiting ring; 209, guide groove; 210, electrode plate II; 211, guide block; 212, screw; 214, connecting wire; 215, end cover; 301, terminal I; 401, terminal II; 701, mounting hole; 702, fixing bolt I; 703, lifting ear; 704, wire hole; 705, fixing bolt II; 706, guide hole. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1 to 8 The present invention provides a technical solution: a reactive power compensation device for eliminating harmonics in a power transmission system, comprising a main frame 1, an adjusting capacitor 2 fixedly mounted on the bottom of the main frame 1, and an inductor 3 fixedly mounted on the upper end of the main frame 1, wherein a base 101 is provided at the lower end of the main frame 1, and a bottom line groove 111 is provided at the lower end of the base 101, a bottom line 113 with three branches is fixedly connected in the middle of the bottom line groove 111, a lower support plate 102 with a plate-like structure is fixedly connected to the upper end of the base 101, and three capacitor mounting holes 103 are evenly distributed in the middle of the lower support plate 102, and the adjusting capacitor 2 is respectively installed in the three capacitor mounting holes 103, specifically, a flange-shaped fixing plate 201 is provided at the lower part of the adjusting capacitor 2, and the adjusting capacitor 2 is fixed to the lower support plate 102 by the fixing plate 201, and four supporting columns 1 104 are symmetrically provided at the four corners of the upper end surface of the lower support plate 102, the supporting columns 1 The upper end of 104 is fixedly connected to an upper support plate 105 of a plate-like structure, and three inductors 3 are fixedly installed on the upper end surface of the upper support plate 105, such as Figure 2As shown, two terminals I 301 are provided at the upper end of each inductor 3, three fixed capacitors 4 are installed at the upper end of the upper support plate 105 and on the inner side surrounded by the three inductors 3, two terminals II 401 are provided at the upper end of each fixed capacitor 4, and socket wires 5 are installed on the terminals I 301 and the terminals II 401, and an external wire 6 is plugged and connected to the terminal I 301.

[0030] like Figures 6 to 8 As shown, the main body of the regulating capacitor 2 is a fixed tube 203 of a tubular structure, and a fixed groove 204 of a slot structure is provided at the bottom of the fixed tube 203, an electrode plate I 205 of a plate structure is fixedly installed in the fixed groove 204, and a guide sleeve I 207 is fixedly provided in the middle of the electrode plate I 205, a screw 212 is set in the guide sleeve I 207, and a wire insertion groove 206 that is plugged into the bottom line 113 is fixedly connected to the lower end surface of the electrode plate I 205. The wire insertion groove 206 forms a parallel relationship between the three regulating capacitors 2 to increase the capacitance, and a limiting ring 208 of an annular boss structure is provided in the middle of the fixed tube 203 and on the inner wall of the fixed tube 203, two guide grooves 209 of a slot structure are provided in the wall of the fixed tube 203 and along the axial direction of the fixed tube 203, and the upper end of the inner wall of the fixed tube 203 is set with an electrode plate II 210 of a plate structure. Two guide blocks 211 that slide in conjunction with the guide groove 209 are symmetrically provided on the outer side of 210. The electrode plate II 210 is screwed to the screw 212. The upper end of the electrode plate II 210 is fixedly connected to the connecting wire 214, and the other end of the connecting wire 214 is plugged into the terminal I 301. The screw 212 is rotated to make the electrode plate II 210 move up and down along the guide groove 209 in the fixed tube 203, and when the electrode plate II 210 slides to the limit ring 208, it will stop. By adjusting the distance between the electrode plate I 205 and the electrode plate II 210, the capacitance value of the adjustment capacitor 2 can be changed.

[0031] Furthermore, a spacer seat 109 with a triangular slot structure is provided between the inductor 3 and the fixed capacitor 4 and on the upper end face of the upper support plate 105, and a guide column 110 is fixedly connected in the middle of the spacer seat 109 and on the upper end face of the upper support plate 105, wherein the spacer seat 109 plays a good isolation and protection role between the inductor 3 and the fixed capacitor 4.

[0032] Furthermore, four support columns II 106 are symmetrically provided at the four corners of the upper end surface of the upper support plate 105, and connecting holes 107 are provided at the upper ends of the support columns II 106. This structure facilitates the assembly of the outer cover 7 and the outer side of the main frame 1.

[0033] Furthermore, an outer cover 7 of a shell structure is fixedly installed on the upper end of the main support 1 and on the outer sides of the lower support plate 102 and the upper support plate 105. The lower end of the outer cover 7 is fixedly connected to the base 101 by a fixing bolt II 705. Four mounting holes 701 are provided at the upper end of the outer cover 7 at the corresponding positions of the connecting holes 107. The mounting holes 701 are equipped with fixing bolts I 702 that are screwed to the connecting holes 107. The outer cover 7 provides good protection for the main support 1 and other components installed on the upper end of the main support 1.

[0034] Furthermore, a guide hole 706 that fits with the guide column 110 is provided in the middle of the upper end surface of the outer cover 7, and two lifting ears 703 are fixedly connected on both sides of the guide hole 706 and on the upper end surface of the outer cover 7. The lifting ears 703 facilitate the lifting and transportation of the entire device. Three wire holes 704 that fit with the external wires 6 are provided on the upper end surface of the outer cover 7 and on one side of the lifting ears 703. The wire holes 704 facilitate the entry and exit of the external wires 6 into the outer cover 7.

[0035] Furthermore, a plate-shaped fixing plate 201 is provided in an annular manner around the lower end of the fixing tube 203, and the fixing plate 201 and the lower support plate 102 are fixedly connected together by connecting bolts I 202. This structure facilitates the loading, unloading, replacement and maintenance of the adjusting capacitor 2 on the main bracket 1.

[0036] Furthermore, an end cover 215 of a shell structure is screwed onto the outer circle of the upper end of the fixed tube 203 , and the end cover 215 is fitted with the screw rod 212 . This structure can effectively prevent dust from entering the fixed tube 203 .

[0037] Furthermore, a suture opening 112 with a groove structure is provided in an annular manner at the lower end of the bottom line groove 111 , and a sealing plate 8 with a plate-like structure is fitted in the suture opening 112 . This arrangement effectively prevents moisture from returning to the bottom of the main support 1 .

[0038] Working principle: put the fixed tube 203 into the capacitor mounting hole 103, and fix the fixed plate 201 on the upper end surface of the lower support plate 102 by connecting the bolts I 202, fix the inductor 3 and the fixed capacitor 4 on the inner and outer sides of the spacer 109 respectively, and connect the terminal I 301 and the terminal II 401 together through the sleeve wire 5, plug the external wire 6 into the terminal II 401 on one side of the fixed capacitor 4, pass the connecting wire 214 through the upper support plate 105 and fix it with the terminal II 401 on the other side of the fixed capacitor 4, plug the bottom line 113 into the wire slot 206, adjust the capacitance value of the capacitor 2 as needed, rotate the screw 212 to make the electrode plate II 210 move up and down in the fixed tube 203 along the guide of the guide groove 209, so that the electrode plate II210 and the electrode plate I 205 is changed, thereby adjusting the capacitance value of the entire regulating capacitor 2. After the adjustment is completed, the external wire 6 is passed through the wire hole 704, and the guide hole 706 is matched with the guide column 110 to make the lower end of the outer cover 7 fit with the base 101, and the lower end of the outer cover 7 is fixedly connected to the base 101 by the fixing bolt II 705, and the mounting hole 701 and the connecting hole 107 are matched together by the fixing bolt I702 to complete the fixation of the outer cover 7 and the main bracket 1, and then the sealing plate 8 is buckled into the suture 112 at the lower end of the main bracket 1. In the entire device, by adjusting the size of the regulating capacitor 2, the entire device can adapt to the harmonic filtering of the power transmission system within different power supply ranges, while avoiding the assembly of multiple harmonic filtering devices, reducing the increase of reactive power, and thus improving the effect of reactive power compensation.

Claims

1. A reactive power compensation device for eliminating harmonics in a power transmission system, comprising a main frame (1), an adjusting capacitor (2) and an inductor (3) mounted on the main frame (1); a base (101) is provided at the lower end of the main frame (1); a bottom line groove (111) is provided at the lower end of the base (101); a bottom line (113) with three-way branches is provided on the bottom line groove (111); a lower support plate (102) with a plate-like structure is provided on the base (101); three capacitor mounting holes (103) are arranged in the middle of the lower support plate (102); the adjusting capacitor (2) is installed in the capacitor mounting hole (103); and the adjusting capacitor (2) is installed in the four corners of the upper end surface of the lower support plate (102). Support columns I (104) are provided at the respective locations, an upper support plate (105) of a plate-like structure is connected to the upper end of the support column I (104), three inductors (3) are installed on the upper end of the upper support plate (105), two binding posts I (301) are provided on the upper end of the inductors (3), three fixed capacitors (4) are installed on the upper end of the upper support plate (105) and on the inner side surrounded by the three inductors (3), two binding posts II (401) are provided on the upper end of the fixed capacitors (4), sleeved wires (5) are installed on the binding posts I (301) and the binding posts II (401), and an external wire (6) is plugged and connected to the binding post I (301); Its characteristics are: The main body of the regulating capacitor (2) is a fixed tube (203) of a tubular structure, a fixed groove (204) of a slot body structure is provided at the bottom of the fixed tube (203), an electrode plate I (205) of a plate structure is installed in the fixed groove (204), a guide sleeve I (207) is provided in the middle of the electrode plate I (205), a screw (212) is passed through the guide sleeve I (207), a wire insertion groove (206) connected to the bottom line (113) is provided on the lower end surface of the electrode plate I (205), an annular boss structure is provided in the middle of the fixed tube (203) and on the inner wall of the fixed tube (203). A limiting ring (208) is provided with two guide grooves (209) of a slot structure in the wall of the fixed tube (203) and along the axial direction of the fixed tube (203); an electrode plate II (210) of a plate-like structure is mounted on the upper end of the inner wall of the fixed tube (203); two guide blocks (211) that are symmetrically arranged on the outer side of the electrode plate II (210) and are slidably matched with the guide grooves (209); the electrode plate II (210) is screwed to the screw rod (212); a connecting wire (214) is connected to the upper end of the electrode plate II (210), and the other end of the connecting wire (214) is connected to the terminal I (301).

2. The reactive power compensation device for eliminating harmonics in a power transmission system according to claim 1, characterized in that: A spacer seat (109) with a triangular slot structure is provided between the inductor (3) and the fixed capacitor (4) and on the upper end surface of the upper support plate (105); a guide column (110) is provided in the middle of the spacer seat (109) and on the upper end surface of the upper support plate (105).

3. The reactive power compensation device for eliminating harmonics in a power transmission system according to claim 2, characterized in that: Support columns II (106) are respectively provided at the four corners of the upper end surface of the upper support plate (105), and a connecting hole (107) is provided at the upper end of the support column II (106).

4. The reactive power compensation device for eliminating harmonics in a power transmission system according to claim 3, characterized in that: An outer cover (7) of a shell structure is sleeved on the outer sides of the lower support plate (102) and the upper support plate (105); the lower end of the outer cover (7) is connected to the base (101) through a fixing bolt II (705); four mounting holes (701) are provided at the upper end of the outer cover (7) and at positions corresponding to the connecting holes (107); fixing bolts I (702) threadedly connected to the connecting holes (107) are inserted into the mounting holes (701).

5. The reactive power compensation device for eliminating harmonics in a power transmission system according to claim 4, characterized in that: A guide hole (706) adapted to the guide column (110) is provided in the middle of the upper end surface of the outer cover (7), and two hanging ears (703) are fixedly connected on both sides of the guide hole (706) and on the upper end surface of the outer cover (7). Three wire holes (704) adapted to be passed through external wires (6) are provided on the upper end surface of the outer cover (7) and on one side of the hanging ears (703).

6. The reactive power compensation device for eliminating harmonics in a power transmission system according to claim 1, characterized in that: A plate-shaped fixing plate (201) is provided in an annular manner at the lower end of the fixing tube (203), and the fixing plate (201) and the lower support plate (102) are fixedly connected together by connecting bolts I (202).

7. The reactive power compensation device for eliminating harmonics in a power transmission system according to claim 1, characterized in that: An end cover (215) of a shell structure is provided at the upper end of the fixed tube (203), and the end cover (215) is fitted with the screw rod (212).

8. The reactive power compensation device for eliminating harmonics in a power transmission system according to claim 1, characterized in that: A sewing opening (112) with a groove structure is provided in an annular manner at the lower end of the bottom thread groove (111), and a sealing plate (8) with a plate-like structure is fixed in the sewing opening (112).

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