CN209472400U - A reactive power compensation device for eliminating harmonics in power transmission system - Google Patents

Abstract

The utility model discloses a kind of reactive power compensators of transmission system harmonic carcellation, including main body rack, the inductance for adjusting capacitor, being fixedly mounted in main body rack upper end being fixedly mounted in main body rack bottom, the lower end of the main body rack is equipped with pedestal, and baseline slot is equipped in the lower end of pedestal, the centre of the baseline slot is fixedly connected with the baseline of three-dimensional branch, the upper end of the pedestal is fixedly connected with the lower supporting plate of plate structure, and is laid with three capacitor mounting holes in the centre of lower supporting plate；By adjusting the capacitance size for adjusting capacitor, it can make to adjust capacitor, inductance and the different size of harmonic filter of fixed capacity composition, be assembled without using multiple harmonic filters, reduce idle increase, improve the effect of reactive compensation；Whole device is set in one high pressure or low pressure use scope by the way that adjusting capacitor will be adjusted, and then improves the scope of application of whole device.

Description

A reactive power compensation device for eliminating harmonics in power transmission system

technical field

The utility model relates to the technical field of improving power systems, in particular to a reactive power compensation device for eliminating harmonics in a power transmission system.

Background technique

The power transmission system is to transmit power to the substation at the same level or lower level. In the power transmission system, high voltage transmission is generally used. The power transmission system operates under a fixed frequency sine wave voltage and current waveform, but when nonlinear loads—such as thyristor rectifiers, frequency converters and After the electric arc furnace is connected to the system, a large amount of harmonic current will be generated, which will lead to distortion of voltage and current. Harmonics will reduce the efficiency of production, transmission and utilization of electric energy, overheat electrical equipment, generate vibration and noise, and cause insulation Aging, shortened service life, or even failure or burnout; harmonics can cause partial parallel resonance or series resonance in the power system, amplify the harmonic content, and cause equipment such as capacitors to burn out; harmonics can also cause relay protection and automatic device malfunctions , causing confusion in electric energy measurement; for the outside of the power system, harmonics cause serious interference to communication equipment and electronic equipment. At the same time, in the power transmission system, many load elements will generate a large amount of reactive power, and these reactive power will generate large losses.

In order to eliminate the damage of harmonics and the loss of reactive power, a harmonic filter for reactive power compensation has been developed in the prior art, which solves some problems of harmonics in the transmission system to a certain extent, but it is used in actual The following disadvantages still exist in the process:

1. The adjustment range of the harmonic filter in the prior art is the predetermined adjustment range, and when harmonic filters of different specifications are required, the filtering function is usually realized by connecting multiple filters in series or in parallel, thereby increasing its filtering cost;

2. The filtering range of the filter in the prior art is divided into high-voltage filtering and low-voltage filtering, which cannot be used universally, thus limiting the scope of application of the filter to a certain extent.

Utility model content

The purpose of this utility model 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-mentioned background technology.

In order to achieve the above purpose, the utility model provides the following technical solutions: a reactive power compensation device for eliminating harmonics in a power transmission system, including a main body bracket, an adjustment capacitor and an inductance installed on the main body bracket, and a base at the lower end of the main body bracket, There is a bottom thread groove at the lower end of the base, and a three-way branched bottom thread is arranged on the bottom thread groove, and a lower support plate with a plate-like structure is arranged at the upper end of the base, and three capacitor installation holes are arranged in the middle of the lower support plate. The inner sleeve adjusts the capacitor; the four corners of the end surface of the lower support plate are respectively provided with support columns I, the upper end of the support column I is connected with a plate-shaped upper support plate, and three inductors are installed on the upper end surface of the upper support plate. There are two terminal posts I on the upper end of the inductance, three fixed capacitors are installed on the upper end of the upper support plate and inside the three inductance enclosures, two terminal posts II are arranged on the upper end of the fixed capacitors, and the terminal post I A sleeve wire is installed on the terminal post II, and an external lead wire is mated and connected to the terminal post I.

Further, the main body of the adjustment capacitor is a fixed pipe with a tubular structure, and a fixed groove with a groove structure is provided at the bottom of the fixed pipe, and an electrode plate I with a plate structure is installed in the fixed groove, and the electrode plate I A guide sleeve 1 is provided in the middle, and a screw rod is pierced in the guide sleeve 1. A wire slot for insertion with the bottom line is provided on the lower end surface of the electrode plate 1. In the middle of the fixed pipe and on the inner wall of the fixed pipe A stop ring with an annular boss structure is provided on the top, two guide grooves with a groove structure are provided in the wall of the fixed pipe and along the axial direction of the fixed pipe, and a plate-shaped The structure of the electrode plate II, on the outside of the electrode plate II, there are two guide blocks slidingly matched with the guide groove, the electrode plate II is screwed with the screw rod, and the upper end of the electrode plate II is connected with a connection wire, and the other end of the connecting wire is connected to the terminal I.

Preferably, a spacer with a triangular groove structure is provided between the inductor and the fixed capacitor and on the upper end surface of the upper support plate, and a guide post is provided in the middle of the spacer and on the upper end surface of the upper support plate.

Preferably, four support columns II are symmetrically provided at the four corners of the upper surface of the upper support plate, and connection holes are provided at the upper ends of the support columns II.

Preferably, an outer cover of the shell structure is sheathed on the outer side of the lower support plate and the upper support plate, the lower end of the outer cover is connected with the base through the fixing bolt II, and the upper end of the outer cover is at the corresponding position of the connection hole. Four installation holes are provided, and the fixing bolts I screwed in the connection holes are worn in the installation holes.

Preferably, a guide hole adapted to the guide post is provided in the middle of the upper end surface of the outer cover, and two lifting lugs are fixedly connected on both sides of the guide hole and on the upper end surface of the outer cover, and the upper end surface of the outer cover There are three wire holes on one side of the lifting ear that are matched with the external wires.

Preferably, the lower end of the fixed pipe is provided with a plate-shaped fixed plate in the circumferential direction, and the fixed plate and the lower support plate are fixedly connected together by connecting bolts I.

Preferably, the upper end of the fixed pipe is provided with an end cap of a shell structure, and the end cap is mated with the screw rod.

Preferably, the lower end of the bottom thread trough is circumferentially provided with a suture opening of the trough body structure, and a sealing plate of a plate-shaped structure is snapped into the suture opening.

Compared with the prior art, the beneficial effects of the utility model are: the utility model has a reasonable structure and strong functionality, and has the following advantages:

1. By adjusting the size of the adjusting capacitor, the adjusting capacitor, inductance and fixed capacitor can form harmonic filters of different sizes, without using multiple harmonic filters for assembly, thus reducing the cost and reducing the increase in reactive power , which improves the effect of reactive power compensation;

2. By adjusting the adjustment capacitor, the whole device is set in a high-voltage or low-voltage range, thereby improving the application range of the whole device.

Description of drawings

Fig. 1 is an exploded view of the structure axis side of the utility model;

Figure 2 is an enlarged schematic view of the local structure at A in Figure 1;

Fig. 3 is a half-section axial side structural view of the utility model;

Fig. 4 is an axial top view of the main body bracket;

Fig. 5 is a bottom view of the shaft side of the main body bracket;

Fig. 6 is a structural view of the axial side of the adjustment capacitor;

Fig. 7 is a schematic diagram of a cross-sectional structure at B-B in Fig. 6;

Fig. 8 is a schematic diagram of the cross-sectional structure at C-C in Fig. 6 .

In the figure: 1. Main body support; 2. Adjusting capacitor; 3. Inductance; 4. Fixed capacitor; 5. Sleeve wire; 6. External wire; 7. Outer cover; 8. Sealing plate; Plate; 103, capacitor installation hole; 104, support column I; 105, upper support plate; 106, support column II; 107, connecting hole; 109, spacer seat; 110, guide column; ; 113, bottom line; 201, fixed plate; 202, connecting bolt 1; 203, fixed pipe; 209, guide groove; 210, electrode plate II; 211, guide block; 212, screw rod; 214, connecting wire; 215, end cover; 301, terminal post I; 401, terminal post II; 701, installation hole; 702, fixed Bolt I; 703, lifting lug; 704, wire hole; 705, fixing bolt II; 706, guide hole.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figures 1 to 8, the utility model provides a technical solution: a reactive power compensation device for eliminating harmonics in a power transmission system, including a main body bracket 1, an adjusting capacitor 2 fixedly installed at the bottom of the main body bracket 1, and a 1. The upper end of the inductor 3 is fixedly installed. The lower end of the main body support 1 is provided with a base 101, and the lower end of the base 101 is provided with a bottom line groove 111. The middle of the bottom line groove 111 is fixedly connected with a three-way branched bottom line 113. There is a lower support plate 102 with a plate-like structure, and three capacitor installation holes 103 are evenly arranged in the middle of the lower support plate 102, and the adjustment capacitor 2 is respectively set in the three capacitor installation holes 103, specifically, the lower part of the adjustment capacitor 2 A flange-shaped fixed plate 201 is provided, and the adjustment capacitor 2 is fixed on the lower support plate 102 by the fixed plate 201, and four support columns 1 104 are symmetrically arranged at the four corners of the upper end surface of the lower support plate 102, and the support columns The upper end of I 104 is fixedly connected with the upper support plate 105 of plate-like structure, and is fixedly installed with three inductors 3 on the upper end face of upper support plate 105, as shown in Figure 2, is provided with two in the upper end of each inductor 3 Terminal I301, on the upper end of the upper support plate 105 and three fixed capacitors 4 are installed on the inner side surrounded by three inductors 3, two terminal II401 are arranged on the upper end of each fixed capacitor 4, the terminal I301 is connected with the wiring The socket wire 5 is installed on the column II 401 , and the external wire 6 is mated and connected to the terminal I 301 .

As shown in Figures 6 to 8, the main body of the adjustment capacitor 2 is a fixed pipe 203 with a tubular structure, and a fixed groove 204 with a groove structure is provided at the bottom of the fixed pipe 203, and a plate-shaped structure is fixedly installed in the fixed groove 204. The electrode plate I 205, and the middle fixed sleeve of the electrode plate I 205 is provided with a guide sleeve I 207, the guide sleeve I 207 is set with a screw 212, and the lower end surface of the electrode plate I 205 is fixedly connected with the bottom line 113. The wire insertion slot 206, through the wire insertion slot 206, the three adjustment capacitors 2 form a parallel relationship to increase the capacitance, and the middle of the fixed tube 203 and the inner wall of the fixed tube 203 are provided with a stop ring 208 of an annular boss structure , the wall of the fixed pipe 203 and along the axial direction of the fixed pipe 203 are provided with two guide grooves 209 of groove structure, the upper end of the inner wall of the fixed pipe 203 is covered with a plate-shaped electrode plate II 210, on the electrode plate II 210 There are two guide blocks 211 that are slidingly matched with the guide groove 209 on the outside left and right. The electrode plate II 210 is screwed with the screw rod 212. The upper end of the electrode plate II 210 is fixedly connected with a connecting wire 214, and the other end of the connecting wire 214 It is plugged with the terminal I 301, wherein the rotating screw 212 makes the electrode plate II 210 move up and down in the fixed tube 203 along the guide groove 209, 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 changes the capacitance value of the adjustment capacitor 2 .

Further, between the inductance 3 and the fixed capacitor 4 and on the upper end surface of the upper support plate 105, a spacer 109 with a triangular groove structure is provided, and in the middle of the spacer 109 and on the upper end surface of the upper support plate 105 is fixedly connected with The guide post 110 , wherein the spacer 109 plays a good role of isolation and protection between the inductor 3 and the fixed capacitor 4 .

Further, four support columns II 106 are symmetrically arranged at the four corners of the upper end surface of the upper support plate 105, and a connection hole 107 is provided at the upper end of the support column II 106. This structure facilitates the assembly of the outer cover 7 and the outside of the main body bracket 1 .

Further, the upper end of the main body support 1 and the outer side of the lower support plate 102 and the upper support plate 105 are fixedly installed with a housing structure housing 7, the lower end of the housing 7 is fixedly connected with the base 101 through the fixing bolt II 705, and the housing 7 Four installation holes 701 are provided at the corresponding positions of the connection holes 107, the installation holes 701 are equipped with fixing bolts I 702 screwed with the connection holes 107, and the main body support 1 and the main body support 1 are connected through the outer cover 7. Other components installed on the upper end are well protected.

Further, a guide hole 706 matched with the guide post 110 is provided in the middle of the upper end surface of the outer cover 7, and two lifting lugs 703 are fixedly connected on both sides of the guide hole 706 and on the upper end surface of the outer cover 7. The ear 703 is convenient for the whole device to be hoisted and carried. The upper end surface of the outer cover 7 and one side of the lifting ear 703 are provided with three wire holes 704 that are matched with the external wire 6. in and out.

Further, the lower end of the fixed tube 203 is provided with a plate-shaped fixed plate 201 around the ring, and the fixed plate 201 and the lower support plate 102 are fixedly connected together through the connecting bolts 1 202. This structure is convenient for adjusting the capacitor 2 on the main body bracket 1. Handling, replacement and repair on the machine.

Further, the outer circle of the upper end of the fixed pipe 203 is screwed with an end cap 215 of shell structure, and the end cap 215 is matched with the screw rod 212 , this structure can effectively prevent dust from entering the fixed pipe 203 .

Further, the lower end of the bottom thread groove 111 is circumferentially provided with a suture opening 112 of a groove structure, and a sealing plate 8 of a plate-shaped structure is clamped in the suture opening 112. This arrangement effectively prevents the bottom of the main body bracket 1 from regaining moisture .

Working principle: put the fixed tube 203 into the capacitor installation hole 103, and fix the fixed plate 201 on the upper end surface of the lower support plate 102 through the connecting bolt I 202, and fix the inductance 3 and the fixed capacitor 4 on the spacer seat 109 respectively Connect the terminal I 301 with the terminal II 401 through the socket wire 5, connect the external wire 6 to the terminal II 401 on the side of the fixed capacitor 4, and pass the connecting wire 214 through The upper support plate 105 is fixedly plugged with the terminal II 401 on the other side of the fixed capacitor 4, the bottom wire 113 is plugged into the wire slot 206, and the capacitance value of the capacitor 2 is adjusted according to the demand, and the screw 212 is rotated to make the electrode plate II 210 moves up and down in the fixed tube 203 along the guidance of the guide groove 209, so that the distance between the electrode plate II 210 and the electrode plate I 205 is changed, and then the capacitance value of the entire adjustment capacitor 2 is adjusted. After the adjustment, connect the external wire 6 from Pass through the wire hole 704, match the guide hole 706 with the guide post 110, make the lower end of the outer cover 7 fit the base 101, and make the lower end of the outer cover 7 and the base 101 fixedly connected together through the fixing bolt II 705. The bolt I702 makes the mounting hole 701 and the connecting hole 107 paired together to complete the fixing of the outer cover 7 and the main body bracket 1, and then fasten the sealing plate 8 into the seam opening 112 at the lower end of the main body bracket 1. In the whole device, through adjustment The size of the capacitor 2 enables the whole device to adapt to the harmonic filtering of the transmission system in different power supply ranges, avoids the assembly of multiple harmonic filtering devices, reduces the increase of reactive power, and thus improves the effect of reactive power compensation.

Claims (9)

1. A reactive power compensation device for eliminating harmonics in a power transmission system, comprising a main body support (1), an adjusting capacitor (2) and an inductance (3) installed on the main body support (1), characterized in that: in the main body support ( 1) The lower end is provided with a base (101), the lower end of the base (101) is provided with a bottom thread groove (111), the bottom thread groove (111) is provided with a three-way branched bottom thread (113), and the base (101) is provided with There is a lower support plate (102) with a plate-like structure, three capacitor mounting holes (103) are arranged in the middle of the lower support plate (102), and the capacitor (2) is set in the capacitor mounting hole (103); ) at the four corners of the upper end surface are respectively provided with support columns I (104), the upper end of the support column I (104) is connected with the upper support plate (105) of the plate-like structure, the upper end of the upper support plate (105) is equipped with three An inductance (3), two binding posts I (301) are arranged on the upper end of the inductance (3), and three fixed capacitors are installed on the upper end of the upper support plate (105) and on the inner side enclosed by the three inductances (3). (4), two terminal posts II (401) are arranged on the upper end of the fixed capacitor (4), and a sleeve wire (5) is installed on the terminal post I (301) and the terminal post II (401), and the wiring The column I (301) is mated with an external wire (6). 2. A reactive power compensation device for eliminating harmonics in a power transmission system according to claim 1, characterized in that: the main body of the adjustment capacitor (2) is a fixed tube (203) with a tubular structure, and the fixed tube (203) ) is provided with a fixed groove (204) with a tank structure, and an electrode plate I (205) with a plate-like structure is installed in the fixed groove (204), and a guide sleeve I is provided in the middle of the electrode plate I (205) (207), in the guide sleeve 1 (207), a screw rod (212) is worn, and the lower end surface of the electrode plate 1 (205) is provided with a wire slot (206) inserted with the bottom line (113). In the middle of the fixed pipe (203) and on the inner wall of the fixed pipe (203), there is a limit ring (208) with an annular boss structure, inside the wall of the fixed pipe (203) and along the axial direction of the fixed pipe (203) There are two guide grooves (209) of groove structure, and an electrode plate II (210) with a plate structure is set on the upper end of the inner wall of the fixed pipe (203), and two symmetrically arranged on the outside of the electrode plate II (210). A guide block (211) slidingly matched with the guide groove (209), the electrode plate II (210) is screwed with the screw rod (212), and the upper end of the electrode plate II (210) is connected with a connecting wire (214), and The other end of the connecting wire (214) is connected with the terminal post I (301). 3. A reactive power compensation device for eliminating harmonics in a power transmission system according to claim 1, characterized in that: between the inductor (3) and the fixed capacitor (4) and on the upper end surface of the upper support plate (105) A spacer seat (109) with a triangular trough structure is provided on the top, and a guide post (110) is provided in the middle of the spacer seat (109) and on the upper end surface of the upper support plate (105). 4. A reactive power compensation device for eliminating harmonics in a power transmission system according to claim 3, 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 connection hole (107) is provided at the upper end of the support column II (106). 5. A reactive power compensation device for eliminating harmonics in a power transmission system according to claim 4, characterized in that: an outer cover of a shell structure ( 7), the lower end of the outer cover (7) is connected to the base (101) through the fixing bolt II (705), and four mounting holes are arranged on the upper end of the outer cover (7) and at the corresponding positions of the connecting holes (107). hole (701), the mounting hole (701) is equipped with a fixing bolt I (702) screwed to the connecting hole (107). 6. A reactive power compensation device for eliminating harmonics in a power transmission system according to claim 5, characterized in that: a guide hole matching the guide post (110) is provided in the middle of the upper end surface of the outer cover (7) (706), and on both sides of the guide hole (706) and on the upper end surface of the outer cover (7) are fixedly connected with two lifting ears (703), on the upper end surface of the outer cover (7) and on the lifting ear ( One side of 703) is provided with three wire holes (704) that are matched with the external wires (6). 7. A reactive power compensation device for eliminating harmonics in a power transmission system according to claim 2, characterized in that: the lower end of the fixed pipe (203) is circumferentially provided with a plate-shaped fixed plate (201), and The fixed plate (201) and the lower supporting plate (102) are fixedly connected together by connecting bolts 1 (202). 8. A reactive power compensation device for eliminating harmonics in a power transmission system according to claim 2, characterized in that: the upper end of the fixed pipe (203) is provided with an end cover (215) of a shell structure, and the end cover ( 215) is matched with screw rod (212). 9. A reactive power compensation device for eliminating harmonics in a power transmission system according to claim 1, characterized in that: the lower end of the bottom thread groove (111) is circumferentially provided with a seam opening (112) of the groove structure, and A sealing plate (8) with a plate-like structure is clamped in the seam opening (112).