CN215643879U - Arc attracting device for direct current grounding electrode circuit - Google Patents
Arc attracting device for direct current grounding electrode circuit Download PDFInfo
- Publication number
- CN215643879U CN215643879U CN202122162832.1U CN202122162832U CN215643879U CN 215643879 U CN215643879 U CN 215643879U CN 202122162832 U CN202122162832 U CN 202122162832U CN 215643879 U CN215643879 U CN 215643879U
- Authority
- CN
- China
- Prior art keywords
- side electrode
- insulator string
- grounding
- arc
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Insulators (AREA)
Abstract
The utility model relates to an arc attracting device for a direct-current grounding electrode circuit, which comprises an insulator string, and a grounding electrode, a grounding electrode circuit and a converter station which are sequentially connected, wherein the grounding electrode circuit is suspended below the insulator string, and arc attracting pieces are arranged at two ends of the insulator string on one side facing the grounding electrode. The arc attracting member is arranged on one side facing the grounding electrode, the arc attracting device is not arranged on one side facing the converter station, when the tower is struck by lightning and discharges electricity, the lightning current is discharged through the arc attracting member and does not pass through the insulator string, and the generated electric arc is far away from the insulator string, so that the arc attracting device has the functions of providing a flashover path, transferring and dredging the electric arc and protecting the insulator string.
Description
Technical Field
The utility model relates to the technical field of high-voltage transmission lines, in particular to an arc attracting device for a direct-current grounding electrode line.
Background
The direct current transmission project is a project for realizing electric energy transmission in a direct current mode. At present, most of power generation and power utilization in a power system are alternating current, and direct current transmission needs to be adopted for current conversion. That is, alternating current needs to be converted into direct current (called rectification) at a sending end, and electric energy is sent to a receiving end through a direct current transmission line; the receiving end needs to convert the dc power into ac power (called inversion) before the ac power can be transmitted to the receiving end ac system for use by the user. The direct current transmission system for current conversion of the transmitting end and the receiving end mainly comprises a transmitting end converter station, a direct current transmission line, a transmitting end grounding electrode and a grounding electrode line. In most cases, the direct current side closed loop is formed by connecting positive and negative poles of the converter stations at two ends by positive and negative pole wires. The earth (metal) loop formed by the grounding electrodes at two ends can be used as a standby lead of a power transmission system. When the direct current grounding circuit normally operates, the path of the direct current is a positive pole lead and a negative pole lead, and almost no current passes through the direct current grounding circuit. When one pole of the transmission line or the converter station has a fault and needs to be quitted, the operation can be converted into a single-pole metal loop mode, the current of a sound pole returns through a loop formed by the grounding poles at two ends and the metal loop (grounding pole line), and the direct current equivalent to a pole wire passes through the grounding pole line at the moment and simultaneously bears a certain system voltage.
The insulation matching of the direct current grounding electrode circuit meets the requirement that the direct current transmission system runs safely and reliably under rated current, maximum overload current, operation overvoltage and lightning overvoltage when running in a single-pole earth return mode. Arc striking devices are additionally arranged at two ends of the insulator string of the grounding electrode circuit to prevent the insulator from being damaged by direct current follow current after overvoltage breakdown and then the insulator is adjusted.
The existing arc attracting device is shown in fig. 1, the arc attracting devices are arranged on two sides of an insulator string, when a circuit is subjected to overvoltage breakdown to penetrate gaps of the arc attracting devices, the gaps on the two sides can be simultaneously broken down, any one side can be broken down, and when an electric arc moves towards a direction close to the insulator string, the insulator string can be ablated to cause a string breaking accident. In recent years, the direct current grounding electrode circuit has the defects that the lightning strike causes the arc striking device of the insulator string to discharge for many times, and the arc approaches the insulator string and ablates the insulator string under the condition of direct current follow current, so that the string is broken.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an arc attracting device for a direct current grounding electrode circuit, which can prevent an electric arc from approaching an insulator string and ablating the insulator string.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a attract arc device for direct current earthing pole circuit, including insulator chain and the earthing pole, earthing pole circuit and the converter station that connect gradually, the earthing pole circuit hangs and sets up the below at insulator chain, the both ends of insulator chain are provided with in one side towards the earthing pole and attract the arc piece.
Further, it includes high-pressure side electrode and ground connection side electrode to attract the arc piece, the high-pressure side electrode is located between insulator chain and the earthing pole circuit, and the ground connection side electrode is located the other end of insulator chain, high-pressure side electrode and ground connection side electrode all have the bending section, and the minimum distance between the bending section of high-pressure side electrode and the bending section of ground connection side electrode is less than the length of insulator chain.
Further, the minimum distance between the bent section of the high-voltage side electrode and the bent section of the ground side electrode is 85% of the length of the insulator string.
Furthermore, the high-voltage side electrode and the grounding side electrode are both galvanized round steel.
Furthermore, the high-voltage side electrode and the grounding side electrode are connected with two ends of the insulator string through the connecting hardware fitting.
Furthermore, the bending section of the high-voltage side electrode is in an inverted V shape, and the bending section of the grounding side electrode is in a V shape.
The utility model has the beneficial effects that: the arc attracting member is arranged on one side facing the grounding electrode, the arc attracting device is not arranged on one side facing the converter station, when the tower is struck by lightning and discharges electricity, the lightning current is discharged through the arc attracting member and does not pass through the insulator string, and the generated electric arc is far away from the insulator string, so that the arc attracting device has the functions of providing a flashover path, transferring and dredging the electric arc and protecting the insulator string.
Drawings
FIG. 1 is a schematic view of a prior art arcing apparatus;
FIG. 2 is a schematic view of the arrangement of the arcing member of the present invention;
FIG. 3 is a schematic diagram of DC power transmission;
FIG. 4 is a schematic diagram showing the current distribution and the direction of electromagnetic force when the positive electrode is in operation;
fig. 5 is a schematic view of current distribution and electromagnetic force direction when the cathode operates.
Detailed Description
The utility model is further illustrated with reference to the following figures and examples.
As shown in fig. 2, the arc striking device for the direct current grounding electrode circuit of the utility model comprises an insulator string 4, and a grounding electrode 1, a grounding electrode circuit 2 and a converter station 3 which are connected in sequence, wherein the grounding electrode circuit 2 is suspended below the insulator string 4, and arc striking pieces 5 are arranged at two ends of the insulator string 4 on one side facing the grounding electrode 1.
The insulator string 4, the grounding electrode 1, the grounding electrode line 2 and the converter station 3 which are connected in sequence adopt the prior embodiment to form a direct current transmission system, the schematic diagram is shown in figure 3, and the grounding electrode line 2 is hung below the insulator string 4.
When the direct-current transmission system operates in a single pole mode, the positive electrode operates in a positive mode, the negative electrode operates in a negative mode, the positive electrode operates as shown in fig. 4, the current direction is from the grounding electrode 1 to the converter station 3, in a normal state, the current I2 passing through the arc striking piece 5 is 0, and when the arc striking piece 5 breaks down, the total current I3 is I1+ I2. According to the direction of the current I1, the direction of the magnetic flux is from the outside to the inside according to the right hand rule, as shown in B. According to the direction of I2 and the direction of the magnetic flux, the direction of the electromagnetic force F is the direction from the direction of the converter station 3 to the earth pole 1, i.e. away from the insulator string 4, according to the left hand rule, in order to avoid that the arc ablates the insulator string 4.
The negative operation is as shown in fig. 5, the current direction is from the converter station 3 to the earth 1, the current I2 through the arcing device 5 is 0 in the normal state, and when the arcing device 5 breaks down, the total current I3 is I1+ I2. According to the direction of the current I1, the direction of the magnetic flux is from inside to outside according to the right-hand rule, as shown in the drawing symbol B. According to the direction of I2 and the direction of the magnetic flux, the direction of the electromagnetic force F is the direction from the direction of the converter station 3 to the earth pole 1, i.e. away from the insulator string 4, according to the left hand rule, in order to avoid that the arc ablates the insulator string 4.
If an arc striking device is also arranged on the side of the insulator string 4 facing the converter station 3, when the arc striking device is broken down, the direction of the electromagnetic force F is also from the direction of the converter station 3 to the grounding electrode 1, but at this time the insulator string 4 is located between the arc striking device and the grounding electrode 1, the generated arc will reach the insulator string 4, so that the insulator string 4 is ablated.
Therefore, the utility model only arranges the arc catching piece 5 at one side facing the grounding electrode 1, and does not arrange the arc catching piece 5 at one side facing the converter station 3, thereby obtaining a better protection structure and better protecting the insulator string 4.
The arc attracting piece 5 can adopt the existing various arc attracting devices, preferably, the arc attracting piece 5 comprises a high-voltage side electrode 52 and a grounding side electrode 51, the high-voltage side electrode 52 is positioned between the insulator string 4 and the grounding electrode circuit 2, the grounding side electrode 51 is positioned at the other end of the insulator string 4, the high-voltage side electrode 52 and the grounding side electrode 51 are galvanized round steel, and are connected with the two ends of the insulator string 4 through connecting hardware fittings. The high-voltage side electrode 52 and the ground side electrode 51 both have curved sections, which may be circular arc-shaped, and preferably, the curved section of the high-voltage side electrode 52 is inverted V-shaped, and the curved section of the ground side electrode 51 is V-shaped. The minimum distance between the bending section of the high-voltage side electrode 52 and the bending section of the grounding side electrode 51 is smaller than the length of the insulator string 4, preferably, the minimum distance between the bending section of the high-voltage side electrode 52 and the bending section of the grounding side electrode 51 is 85% of the length of the insulator string 4, when the tower is subjected to lightning stroke discharge, lightning current is discharged through the bending section of the high-voltage side electrode 52 and the bending section of the grounding side electrode 51 and does not pass through the insulator string 4, and the generated electric arc is far away from the insulator string 4, so that the functions of providing a flashover path, transferring and dredging the electric arc and protecting the insulator string 4 are achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A move arc device for direct current earthing pole circuit, including insulator chain (4) and earthing pole (1), earthing pole circuit (2) and converter station (3) that connect gradually, earthing pole circuit (2) hang and set up the below at insulator chain (4), its characterized in that: and arc striking pieces (5) are arranged at two ends of the insulator string (4) on one side facing the grounding electrode (1).
2. The arcing apparatus for a direct current earth electrode line of claim 1, wherein: the arc attracting piece (5) comprises a high-voltage side electrode (52) and a grounding side electrode (51), the high-voltage side electrode (52) is located between an insulator string (4) and a grounding electrode circuit (2), the grounding side electrode (51) is located at the other end of the insulator string (4), the high-voltage side electrode (52) and the grounding side electrode (51) are both provided with bending sections, and the minimum distance between the bending sections of the high-voltage side electrode (52) and the grounding side electrode (51) is smaller than the length of the insulator string (4).
3. The arcing apparatus for a direct current earth electrode line of claim 2, wherein: the minimum distance between the bent section of the high-voltage side electrode (52) and the bent section of the grounding side electrode (51) is 85% of the length of the insulator string (4).
4. The arcing apparatus for a direct current earth electrode line of claim 2, wherein: the high-voltage side electrode (52) and the grounding side electrode (51) are both galvanized round steel.
5. The arcing apparatus for a direct current earth electrode line of claim 2, wherein: the high-voltage side electrode (52) and the grounding side electrode (51) are connected with two ends of the insulator string (4) through connecting hardware fittings.
6. The arcing apparatus for a direct current earth electrode line of claim 2, wherein: the bending section of the high-voltage side electrode (52) is in an inverted V shape, and the bending section of the grounding side electrode (51) is in a V shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122162832.1U CN215643879U (en) | 2021-09-08 | 2021-09-08 | Arc attracting device for direct current grounding electrode circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122162832.1U CN215643879U (en) | 2021-09-08 | 2021-09-08 | Arc attracting device for direct current grounding electrode circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215643879U true CN215643879U (en) | 2022-01-25 |
Family
ID=79911617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122162832.1U Active CN215643879U (en) | 2021-09-08 | 2021-09-08 | Arc attracting device for direct current grounding electrode circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215643879U (en) |
-
2021
- 2021-09-08 CN CN202122162832.1U patent/CN215643879U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201478816U (en) | Air blowing and variable gap arc extinguishing lightning protection gap device | |
| CN203386547U (en) | Integrated fixed external series gap self-disengaging metal oxide lightning arrester insulators | |
| CN209823107U (en) | High-efficient lightning protection system of wind-powered electricity generation field | |
| CN215643879U (en) | Arc attracting device for direct current grounding electrode circuit | |
| CN103337315B (en) | The device of the lightning protection inter space Insulation Coordination method based on Coulomb force striking | |
| CN111200268B (en) | Installation method of safety lightning arrester | |
| CN209994107U (en) | Dynamic insulation matched boosting ionization device | |
| CN2438213Y (en) | Composite insulation zinc oxide arrester for lightning protection of line | |
| CN2912043Y (en) | Lightning stroke protector for overhead insulated wire | |
| CN201466619U (en) | Gap lightning protection device | |
| CN112117745A (en) | Dynamic insulation matching method and device for eliminating power frequency insulation strength loss | |
| CN204538463U (en) | A kind of paracentesis type external clearance arrester | |
| CN205565709U (en) | Intelligence remote control prevents built on stilts insulation protection device | |
| CN206388574U (en) | Parallel connection clearance device for porcelain insulator lightning protection | |
| CN114336179B (en) | Lightning-proof broken line protection device for shielding, insulating and isolating 10kV overhead insulated line | |
| CN215868826U (en) | Insulator lightning protection structure | |
| CN203631987U (en) | Lightning-protection device for insulator through employing rotating shaft for double-adjustment of parallel gap | |
| CN209804357U (en) | Lightning protection equipment for overhead line | |
| Ishimoto et al. | Calculation of wire breaking rate of medium-voltage distribution line due to lightning | |
| CN202996446U (en) | Composite insulator | |
| CN210142546U (en) | DC grounding electrode circuit arcing angle with self-arc-extinguishing function | |
| CN202549516U (en) | Suspension type line arrester for alternating current system | |
| CN214280429U (en) | 500kV discharge gap device | |
| CN203660276U (en) | Gap lightning protection device | |
| CN108281242A (en) | The line thunder protection insulator of annular valve structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |