CN214707151U - Electromagnetic filter for eliminating stray current interference - Google Patents
Electromagnetic filter for eliminating stray current interference Download PDFInfo
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- CN214707151U CN214707151U CN202120030249.2U CN202120030249U CN214707151U CN 214707151 U CN214707151 U CN 214707151U CN 202120030249 U CN202120030249 U CN 202120030249U CN 214707151 U CN214707151 U CN 214707151U
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Abstract
The utility model relates to the technical field of electromagnetic interference resistance, and discloses an electromagnetic filter for eliminating strong stray current interference, which comprises a bottom plate fixed inside an explosion-proof shell through a fastener; a filtering circuit connected between the pipeline and the ground is fixed on the bottom plate; the filtering circuit comprises an alternating current filtering element, a direct current filtering element and a lightning surge filtering element which are sequentially connected in parallel; the alternating current filtering element is a capacitor; the direct current filtering element is a first diode and a second diode which are connected in parallel; the lightning surge filtering element is a lightning protection unit. When the filter of the utility model filters the alternating current, the current on the pipeline reaches the ground after passing through the capacitor; when the direct current is filtered, the current on the pipeline reaches the ground after passing through the first diode or the second diode; when the lightning surge current is filtered, the current on the pipeline reaches the ground after passing through the lightning protection unit to protect the strong current interference of the lightning surge.
Description
Technical Field
The utility model relates to an anti-interference technical field of electromagnetism, in particular to get rid of stray current interference's electromagnetic filter.
Background
When the buried steel pipeline is close to an electric power transmission iron tower or is interfered by stray current of an extra-high voltage transmission line, the existing drainage product, namely the fault current and steady-state current carrying capacity of the solid decoupling device, is not enough, so that the solid decoupling device is easily damaged. At present, a drainage scheme for an area with strong interference mainly comprises the steps that a plurality of solid-state decoupling devices are arranged to work simultaneously to remove interference, so that the solid-state decoupling devices can work in a high-load state for a long time, and the service life is greatly reduced; in addition, after the solid-state decoupling device fails, the pipe-to-ground potential generated by the stray current is in an abnormal state for a long time, so that the pipeline is subjected to accelerated corrosion and perforation, and safety accidents are caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides an get rid of stray current interference's electromagnetic filter puts, and it is not enough to solve current solid-state decoupling ware fault current and steady state current bearing capacity, can't satisfy actual demand's problem.
The utility model discloses a realize through following scheme:
an electromagnetic filter for eliminating stray current interference comprises a bottom plate fixed in an explosion-proof shell through a fastener; a filtering circuit connected between the pipeline and the ground is fixed on the bottom plate;
the filtering circuit comprises an alternating current filtering element, a direct current filtering element, a lightning surge filtering element and a ceramic piece which are sequentially connected in parallel; the alternating current filtering element is a capacitor; the direct current filtering element is a first diode and a second diode which are connected in parallel; the lightning surge filtering element is a lightning protection unit;
when alternating current is filtered, the current on the pipeline reaches the ground after passing through the capacitor;
when the direct current is filtered, the current on the pipeline reaches the ground after passing through the first diode or the second diode;
when the lightning surge current is filtered, the current on the pipeline reaches the ground after passing through the lightning protection unit;
when the circuit is subjected to alternating fault current, lightning surge current or alternating steady-state current overload operation, the circuit short circuit enables the ceramic piece to be conducted, and the current is led to the ground.
Further, the capacitor is a non-polar capacitor.
Further, the first diode and the second diode are conducted in opposite directions.
Furthermore, the first diode, the second diode and the lightning protection unit are packaged separately by a packaging mechanism.
Further, the encapsulation mechanism comprises rubber encapsulation outer sleeves, screw rods are arranged on the left side and the right side of each rubber encapsulation outer sleeve, a left electrode and a right electrode are arranged between the upper inner wall and the lower inner wall of each rubber encapsulation outer sleeve through glass cloth sleeves, and springs, first diodes, second diodes or lightning protection units are connected between the electrodes.
Furthermore, the screws on two sides of the packaging mechanism are respectively connected to two conductive metal plates, and four non-polar capacitors are distributed and connected on two sides of the two conductive metal plates.
Further, a ceramic piece for failure protection is connected to the filtering circuit in parallel.
Furthermore, the ceramic piece is internally provided with meltable soldering tin, and when a circuit is in short circuit, the soldering tin is melted to enable the ceramic piece to be conducted.
The utility model has the advantages of it is following:
1) an alternating current filtering unit, a direct current filtering unit and a lightning surge filtering element are arranged in the electromagnetic filter, alternating current is filtered through a non-polar capacitor, direct current is filtered through a first diode and a second diode, and strong current interference of lightning surge is protected through a lightning protection unit;
2) the conductive metal plate is used as an electrical connecting piece, so that the structure of the filter circuit is more compact, and meanwhile, the conductive metal plate is used as a heat dissipation plate, so that the heat of the power device is effectively dissipated;
3) the bottom plate of the electromagnetic filter adopts an epoxy resin plate, an explosion-proof shell is used, and the first diode, the second diode or the lightning protection unit are sealed by rubber, so that the safety performance of the product is further ensured;
4) still be provided with ceramic member, the inside soldering tin that can melt at specific temperature that sets up of ceramic member guarantees that the product can effective short circuit under the thermal failure state, does not influence the lightning grounding function of system.
Drawings
FIG. 1 is a block diagram of an electromagnetic filter;
FIG. 2 is a circuit diagram of a filter circuit;
FIG. 3 is a block diagram of a packaging mechanism;
in the figure: 1-bottom plate, 2-fastener, 3-explosion-proof shell, 40-capacitor, 41-first diode, 42-second diode, 43-lightning protection unit, 50-packaging outer sleeve, 51-glass cloth tube, 52-electrode, 53-spring, 6-conductive metal plate and 7-ceramic piece.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
An electromagnetic filter for eliminating interference of stray current, as shown in fig. 1, comprises a bottom plate 1 fixed inside an explosion-proof shell 3 through a fastener 2; the bottom plate 1 is made of epoxy resin; a filter circuit connected between the pipeline and the ground is fixed on the bottom plate 1;
as shown in fig. 2, the filtering circuit includes an ac filtering element, a dc filtering element and a lightning surge filtering element connected in parallel in sequence; the alternating current filtering element is a non-polar capacitor 40; the dc filter element is a first diode 41 and a second diode 42 connected in parallel, and the first diode 41 and the second diode 42 are opposite in conduction direction; the lightning surge filtering element is a lightning protection unit 43;
the first diode 41, the second diode 42 and the lightning protection unit 43 are separately packaged by a packaging mechanism; as shown in fig. 3, the encapsulation mechanism includes a rubber encapsulation outer sleeve 50 having screws on both left and right sides, a left electrode 52 and a right electrode 52 are sandwiched between the upper and lower inner walls of the rubber encapsulation outer sleeve through a glass cloth tube 51, and a spring 53, a first diode 41, a second diode 42 or a lightning protection unit 43 are connected between the electrodes 52; the screws on the two sides of the packaging mechanism are respectively connected to the two conductive metal plates 6, the conductive metal plates 6 are copper plates, and the two sides of the two conductive metal plates 6 are respectively connected with four non-polar capacitors.
The working principle of the embodiment is as follows:
when alternating current is filtered, the current on the pipeline reaches the ground after passing through the capacitor 40;
when the direct current is filtered, the current on the pipeline reaches the ground after passing through the first diode 41 or the second diode 42;
when the lightning surge current is filtered, the current on the pipeline reaches the ground after passing through the lightning protection unit 43.
The beneficial effect of this embodiment is:
in terms of circuitry: an alternating current filtering unit, a direct current filtering unit and a lightning surge filtering element are arranged in the electromagnetic filter, alternating current is filtered through a non-polar capacitor, direct current is filtered through a first diode and a second diode, and strong current interference of lightning surge is protected through a lightning protection unit; in terms of structure: the conductive metal plate is used as an electrical connecting piece, so that the structure of the filter circuit is more compact, and meanwhile, the conductive metal plate is used as a heat dissipation plate, so that the heat of the power device is effectively dissipated; in terms of materials: the bottom plate of the electromagnetic filter adopts an epoxy resin plate, an explosion-proof shell is used, the first diode, the second diode or the lightning protection unit are sealed through rubber, and the safety performance of the product is further guaranteed.
Example 2
In addition to embodiment 1, a ceramic member 7 for fail safe is connected in parallel to the filter circuit, and a fusible solder is provided inside the ceramic member 7.
The working principle of the embodiment is as follows:
when the filter circuit is subjected to overload operation or failure of alternating fault current, lightning surge current and alternating steady-state current, the filter circuit is in a short-circuit mode, at the moment, when the circuit temperature reaches the melting temperature of soldering tin in the ceramic piece 7, the soldering tin melts, the ceramic piece 7 is conducted, and the current is led to the ground.
The beneficial effect of this embodiment is: the inside soldering tin that can melt at specific temperature that sets up of ceramic member guarantees that the product can effective short circuit under the thermal failure state, does not influence the ground function of system.
The content of the present invention is not limited to the examples, and any equivalent transformation adopted by the technical solution of the present invention is covered by the claims of the present invention by those skilled in the art through reading the present invention.
Claims (7)
1. An electromagnetic filter for eliminating interference of stray current is characterized by comprising a bottom plate (1) fixed inside an explosion-proof shell (3) through a fastener (2); a filter circuit connected between the pipeline and the ground is fixed on the bottom plate (1);
the filter circuit comprises an alternating current filtering element, a direct current filtering element, a lightning surge filtering element and a ceramic piece (7) which are sequentially connected in parallel; the alternating current filtering element is a capacitor (40); the direct current filtering element is a first diode (41) and a second diode (42) which are connected in parallel; the lightning surge filtering element is a lightning protection unit (43);
when alternating current is filtered, the current on the pipeline reaches the ground after passing through the capacitor (40);
when the direct current is filtered, the current on the pipeline reaches the ground after passing through a first diode (41) or a second diode (42);
when the lightning surge current is filtered, the current on the pipeline reaches the ground after passing through the lightning protection unit (43);
when the circuit is subjected to an alternating fault current, a lightning surge current or an alternating steady-state current overload operation, the short circuit of the circuit makes the ceramic member (7) conductive, and the current is led to the ground.
2. The electromagnetic filter for rejecting interference from stray currents according to claim 1, wherein said capacitor (40) is a non-polar capacitor.
3. Electromagnetic filter for eliminating interference of stray currents according to claim 1, wherein said first diode (41) and said second diode (42) are conducted in opposite directions.
4. The electromagnetic filter for eliminating interference of stray current as claimed in claim 3, wherein said first diode (41), said second diode (42) and said lightning protection unit (43) are individually packaged by a packaging mechanism.
5. The electromagnetic filter for eliminating interference of stray current according to claim 4, wherein said packaging mechanism comprises a rubber packaging casing (50) with screws on both left and right sides, a left electrode (52) and a right electrode (52) are sandwiched between the upper and lower inner walls of the casing through a glass cloth tube (51), and a spring (53) and a first diode (41), a second diode (42) or a lightning protection unit (43) are connected between the electrodes (52).
6. The electromagnetic filter for eliminating interference of stray current according to claim 5, wherein the screws on both sides of the packaging mechanism are respectively connected to two conductive metal plates (6), and four non-polar capacitors are distributed and connected on both sides of the two conductive metal plates (6).
7. An electromagnetic filter for removing stray current interference according to claim 1, wherein said ceramic member (7) has a fusible solder disposed therein, and when the circuit is short-circuited, the solder melts to conduct the ceramic member (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120030249.2U CN214707151U (en) | 2021-01-07 | 2021-01-07 | Electromagnetic filter for eliminating stray current interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120030249.2U CN214707151U (en) | 2021-01-07 | 2021-01-07 | Electromagnetic filter for eliminating stray current interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214707151U true CN214707151U (en) | 2021-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120030249.2U Active CN214707151U (en) | 2021-01-07 | 2021-01-07 | Electromagnetic filter for eliminating stray current interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214707151U (en) |
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2021
- 2021-01-07 CN CN202120030249.2U patent/CN214707151U/en active Active
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