CN213866420U - High-performance alternating-current interference current drainage device for cathode protection - Google Patents
High-performance alternating-current interference current drainage device for cathode protection Download PDFInfo
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- CN213866420U CN213866420U CN202022775623.XU CN202022775623U CN213866420U CN 213866420 U CN213866420 U CN 213866420U CN 202022775623 U CN202022775623 U CN 202022775623U CN 213866420 U CN213866420 U CN 213866420U
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Abstract
The utility model discloses a high performance alternating current interference current drainage ware for cathodic protection, include: the shell is a cast aluminum explosion-proof box and comprises a box body and an upper cover which can be opened and closed and is arranged on the box body; the capacitor is a non-polar capacitor and is fixed on the inner bottom surface of the box body; the diodes are fixed on the inner wall of the box body; and the surge protector is fixed on the inner bottom surface of the box body. The utility model discloses an adopt a plurality of powerful diodes, can switch on direct current heavy current effectively, clamp down electric capacity both ends ground voltage reliably below 2V, avoided probably the trouble that ground diode overflows and burns out, electric capacity excessive pressure punctures.
Description
Technical Field
The utility model relates to a current drainage ware field. More specifically, the present invention relates to a high performance ac interference current drainage device for cathodic protection.
Background
Along with the rapid and continuous development of national economy, a large number of oil and gas long-distance transmission pipelines and high-voltage transmission lines are constructed correspondingly. Under the limitation of conditions such as land conservation and farmland protection, facilities such as oil and gas pipelines, power transmission lines, electrified railways and the like are often arranged in parallel, adjacently or in a cross manner, and power supply systems, track traffic systems and third-party pipelines near metal pipelines often apply alternating-current stray currents and static-dynamic direct-current stray currents to the metal pipelines in a capacitive coupling, inductive coupling and resistive coupling manner. The stray currents can flow in and out from the defects of the anti-corrosion layer of the pipeline to cause the electrochemical corrosion of the pipeline, and the normal work of the cathodic protection system can be influenced by the potential fluctuation of the pipeline caused by the stray currents, so that the protection of the pipeline is damaged.
Aiming at the interference of alternating stray current, the current prevention and treatment method commonly used at home and abroad adopts the form of an alternating current drainer and a low-resistance anode ground bed and adopts the modes of polar drainage and forced drainage to reduce or eliminate the influence of the alternating stray current in the pipeline. At present, the alternating current drainer mostly adopts a large-capacity capacitor to conduct alternating current, and a diode is used to conduct abnormal direct current, and meanwhile, the loss of cathodic protection current is prevented. Alternating current drainage performance is concerned mostly in the industry, ultra-large-capacity capacitors are used for drainage, abnormal direct current is rarely researched, and a direct current diode adopts a low-power device, so that a drainage product is very easy to break down when being impacted by the abnormal current.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.
To achieve these objects and other advantages in accordance with the purpose of the invention, a high performance ac interference current collector for cathodic protection is provided, comprising:
the shell is a cast aluminum explosion-proof box and comprises a box body and an upper cover which can be opened and closed and is arranged on the box body;
the capacitor is a non-polar capacitor and is fixed on the inner bottom surface of the box body;
the diodes are fixed on the inner wall of the box body;
and the surge protector is fixed on the inner bottom surface of the box body.
Preferably, the high-performance ac interference current drainage device for cathodic protection further includes: the wiring terminal is provided with three terminals and fixed on the inner bottom surface of the box body.
Preferably, the number of the diodes is six, wherein the anodes and the cathodes of three of the diodes are sequentially connected in series through leads to form an anode direction diode group, and the anodes and the cathodes of the other three of the diodes are sequentially connected in series to form a cathode direction diode group.
Preferably, the bottom surface of the diode 7 is coated with heat-conducting silicone grease, and the bottom surface of the diode is attached to the inner wall of the box body.
Preferably, the capacitor, the surge protector, the anode direction diode group, and the cathode direction diode group are connected in parallel with each other.
Preferably, after the positive electrode of the capacitor, the positive electrode of the surge protector, the positive electrode of the anode direction diode group, and the negative electrode of the cathode direction diode group are connected to each other, the positive electrode of the capacitor is connected to the positive electrode of the connection terminal; and the negative electrode of the capacitor, the negative electrode of the surge protector, the negative electrode of the anode direction diode group and the positive electrode of the cathode direction diode group are connected with each other and then connected with the negative electrode of the connecting terminal.
Preferably, the upper cover and the box body are fixed through bolts, and a rubber gasket is arranged between the upper cover and the box body.
The utility model discloses at least, include following beneficial effect:
1. the utility model utilizes the capacitor to conduct the alternating current discharged from the ground bed, and when the larger impact current is not enough to trigger the surge protector, the diode plays the role of direct current conduction; a large current in the event of a fault, such as a lightning current, flows through the surge protector.
2. The utility model can clamp the DC potential difference between the cathode end and the anode end within the range of +/-2V, thereby avoiding the possible situations of over-current burning of the diode, over-voltage breakdown of the capacitor and the like; and the direct current passing through the alternating current drainer does not exceed 1mA, so that the cathodic protection potential of the pipeline cannot be influenced.
3. The utility model discloses in all electronic component all install in an explosion-proof box, the bottom surface of diode with the box inner wall closely laminates, ensures its heat conductivility, all the other components distribute be in on the electric bottom plate of box. The utility model discloses possess the stronger performance of resisting low pressure heavy current impact, can switch on the heavy current effectively, have good service performance.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural view of the upper cover according to the above embodiment of the present invention;
fig. 3 is a circuit diagram of the above embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1 to 3, the present invention provides a high performance ac interference current drainage device for cathode protection, including: the shell is a cast aluminum explosion-proof box and comprises a box body 6 and an upper cover 8 which can be opened and closed and is arranged on the box body; the capacitor 1 is a non-polar capacitor, and the capacitor 1 is fixed on the inner bottom surface of the box body 6; a plurality of diodes 7 fixed on the inner wall of the case 6; and a surge protector 4 fixed to an inner bottom surface of the case 6.
In the technical scheme, the capacitor 1, the diode 7 and the surge protector 4 are all installed in the explosion-proof box 6, the diode 7 is tightly attached to the inner wall of the box 6 to ensure the heat conduction performance of the box, and the rest elements are distributed on an electric bottom plate of the box 6, wherein the capacitor 1 is a large-capacity nonpolar capacitor with the electric capacity of 220000 muF, the diode 7 is a high-power diode, and the maximum passing current of the surge protector 4 is 100 kA. Under normal conditions, alternating current discharged by the ground bed flows through the capacitor 1, the alternating current impedance is as low as 15m omega, and the alternating current interference of the buried pipeline is effectively restrained; when the large impact current is not enough to trigger the surge protector 4, the diode 7 plays a role of direct current conduction, and bidirectional current of 100A is allowed to pass at maximum; a large current in the event of a fault, such as a lightning current, flows through the surge protector 4. When the direct current potential difference between the cathode end and the anode end is within the range of +/-2V, the direct current passing through the high-performance alternating current interference current discharger for cathode protection does not exceed 1mA, so that the cathode protection potential of the pipeline cannot be influenced.
In another embodiment, the high performance ac interference current drainage device for cathodic protection further comprises: binding post 5, binding post 5 is equipped with three terminal, binding post 5 is fixed on the interior bottom surface of box.
In another embodiment, the number of the diodes 7 is six, wherein the anodes and the cathodes of three of the diodes 7 are sequentially connected in series through conducting wires to form the anode direction diode group 3, and the anodes and the cathodes of the other three of the diodes are sequentially connected in series to form the cathode direction diode group 2. By using the high-power diode 7 to conduct abnormal direct current, the maximum direct current of 100A can be passed, and the current impact resistance of the product is greatly improved.
In another embodiment, the bottom surface of the diode 7 is coated with heat-conducting silicone grease, and the bottom surface of the diode 7 is attached to the inner wall of the box body. By coating the heat conductive silicone grease, the heat dissipation performance of the diode 7 is increased. The bottom surface of the diode 7 is tightly attached to the inner wall of the box body 6, so that heat is transferred to the outside through the box body 6 as soon as possible.
In another embodiment, the capacitor 1, the surge protector 4, the anode direction diode group 3 and the cathode direction diode group 2 are connected in parallel with each other.
In another embodiment, the positive electrode of the capacitor 1, the positive electrode of the surge protector 4, the positive electrode of the anode direction diode group 3, and the negative electrode of the cathode direction diode group 2 are connected to each other, and then connected to the positive electrode of the connection terminal 5; the negative electrode of the capacitor 1, the negative electrode of the surge protector 4, the negative electrode of the anode direction diode group 3, and the positive electrode of the cathode direction diode group 2 are connected to each other, and then connected to the negative electrode of the connection terminal 5. In the technical scheme, the anode diode group 3 and the cathode diode group 2 are reversely connected in parallel to form a clamping circuit, the potential of a pipeline is accurately clamped in a range of +/-2V, direct-current voltage above 2V is automatically eliminated, the cathode protection potential is ensured to be maintained at-1.2V while stray current is eliminated, and cathode protection current loss is effectively prevented.
In another embodiment, the upper cover 8 and the box body 6 are fixed by bolts, and a rubber gasket is arranged between the upper cover 8 and the box body 6. The joint of the upper cover 8 and the box body 6 is sealed by the rubber gasket.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (7)
1. A high performance ac interference current drain for cathodic protection, comprising:
the shell is a cast aluminum explosion-proof box and comprises a box body and an upper cover which can be opened and closed and is arranged on the box body;
the capacitor is a non-polar capacitor and is fixed on the inner bottom surface of the box body;
the diodes are fixed on the inner wall of the box body;
and the surge protector is fixed on the inner bottom surface of the box body.
2. The high performance ac interference current drain for cathodic protection as set forth in claim 1 further comprising: the wiring terminal is provided with three terminals and fixed on the inner bottom surface of the box body.
3. The high performance ac interference current drainage device for cathodic protection as claimed in claim 2, wherein said diodes are six in number, wherein the anodes and cathodes of three of said diodes are connected in series in turn by conductive wires to form an anode direction diode group, and the anodes and cathodes of the other three of said diodes are connected in series in turn to form a cathode direction diode group.
4. The high performance ac interference current drain for cathodic protection as set forth in claim 3 wherein said diode bottom surface is coated with a thermally conductive silicone grease, said diode bottom surface being attached to said tank interior wall.
5. The high performance ac interference current drain for cathodic protection as recited in claim 3 wherein said capacitor, said surge protector, said anode direction diode bank and said cathode direction diode bank are connected in parallel with each other.
6. The high-performance ac interference current discharger for cathodic protection as claimed in claim 5, wherein after the positive electrode of said capacitor, the positive electrode of said surge protector, the positive electrode of said anode direction diode group and the negative electrode of said cathode direction diode group are connected to each other, they are connected to the positive electrode of said connection terminal; and the negative electrode of the capacitor, the negative electrode of the surge protector, the negative electrode of the anode direction diode group and the positive electrode of the cathode direction diode group are connected with each other and then connected with the negative electrode of the connecting terminal.
7. The high performance ac interference current drain for cathodic protection as set forth in claim 1 wherein said upper cover is bolted to said box with a rubber gasket disposed therebetween.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022775623.XU CN213866420U (en) | 2020-11-26 | 2020-11-26 | High-performance alternating-current interference current drainage device for cathode protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022775623.XU CN213866420U (en) | 2020-11-26 | 2020-11-26 | High-performance alternating-current interference current drainage device for cathode protection |
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| CN213866420U true CN213866420U (en) | 2021-08-03 |
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| CN202022775623.XU Active CN213866420U (en) | 2020-11-26 | 2020-11-26 | High-performance alternating-current interference current drainage device for cathode protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116065156A (en) * | 2022-12-29 | 2023-05-05 | 北京安科管道工程科技有限公司 | Low-threshold potential polarity drainer |
-
2020
- 2020-11-26 CN CN202022775623.XU patent/CN213866420U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116065156A (en) * | 2022-12-29 | 2023-05-05 | 北京安科管道工程科技有限公司 | Low-threshold potential polarity drainer |
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