CN110911142A - Lightning-protection contact for three-dimensional wound core transformer - Google Patents
Lightning-protection contact for three-dimensional wound core transformer Download PDFInfo
- Publication number
- CN110911142A CN110911142A CN201911363145.7A CN201911363145A CN110911142A CN 110911142 A CN110911142 A CN 110911142A CN 201911363145 A CN201911363145 A CN 201911363145A CN 110911142 A CN110911142 A CN 110911142A
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- CN
- China
- Prior art keywords
- side electrode
- insertion block
- lightning
- shell
- zinc oxide
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- 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.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
Abstract
The invention discloses a lightning protection contact for a three-dimensional wound core transformer, which comprises a shell, wherein an umbrella sleeve is arranged outside the shell, an insulating support body is arranged in the shell, and a plurality of layers of zinc oxide resistance cards are arranged in the insulating support body; the inner wall of the upper end of the insulating support body is provided with a concave ring, a stop block made of low-temperature alloy is embedded into the concave ring, a baffle is arranged below the stop block, a pop-up spring and a zinc oxide resistance chip are arranged below the baffle, an upper binding post is fixed above the baffle, and the lower part of the zinc oxide resistance chip is connected with a lower electrode. The invention has the advantages that: when lightning stroke occurs, the lightning stroke current is conducted with the grounding end through the lightning arrester, and meanwhile, the connection with the power utilization end is disconnected, so that the three-dimensional iron core transformer connected with the power utilization end is protected.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a lightning arrester.
Background
The three-dimensional wound core transformer is different from the traditional planar laminated core transformer. The iron core is composed of three-phase column yokes with single frame pieces in three-dimensional triangular arrangement. Each column body is continuously rolled by a high-quality cold-rolled silicon steel strip, and the strip width is sheared linearly or in a curve by a numerical control cutting machine. Winding the strip on an iron core winding machine into a nearly circular or edgefold arc frame sheet, and then performing vacuum nitrogen-filling annealing treatment to eliminate processing stress, reorient crystal lattices, improve magnetic permeability and improve electromagnetic performance; the high-low voltage coil is directly wound on the iron core column paper tube by using a special winding machine, the whole structure is solid and compact, the body adopts upper and lower iron yoke insulation and laminated wood, and the coil is tightened by pulling screw rods all around, so that the high-low voltage coil is stable and firm and can bear the impact force during sudden short circuit. Due to the above characteristics, the three-dimensional wound core transformer is more and more widely used; however, when the lightning protection device is used, a corresponding lightning protection circuit needs to be arranged to prevent the overvoltage caused by lightning from damaging the lightning protection device. When overvoltage occurs, the power supply side is connected with the ground through the lightning arrester, preferably is simultaneously disconnected with the power supply side, and the existing lightning arresters do not have the function; in this case, the electric equipment is very easily damaged by the lightning strike.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a lightning protection contact for a three-dimensional wound core transformer, which comprises a shell, wherein an umbrella sleeve is arranged outside the shell, an insulating support body is arranged in the shell, and a plurality of layers of zinc oxide resistance cards are arranged in the insulating support body; the inner wall of the upper end of the insulating support body is provided with a concave ring, a stop block made of low-temperature alloy is embedded into the concave ring, a baffle plate is arranged below the stop block, an ejection spring and a zinc oxide resistance chip are arranged below the baffle plate, an upper binding post is fixed above the baffle plate, and the lower part of the zinc oxide resistance chip is connected with a lower electrode;
the upper wiring terminal is inserted into a force application hole of the pressure-driven opening and closing wire clamp and is abutted against the lower part of the insertion block; the pressure-driven opening and closing wire clamp comprises a base, wherein coaxial through holes are formed in two sides of the base, and a power supply side electrode and a power utilization side electrode are embedded into the through holes; a threaded through hole is formed above the base, threads are arranged on the outer side of the sliding seat, the sliding seat is screwed in the threaded through hole, and a slide way is arranged in the middle of the sliding seat; one end of the insertion block is a straight surface, the other end of the insertion block is an inclined surface, the surface of the power supply side electrode corresponding to the insertion block is a straight surface, and the surface of the power utilization side electrode corresponding to the insertion block is an inclined surface; the insertion block is arranged between the power supply side electrode and the power utilization side electrode; a sliding rod is arranged above the inserting block and inserted into the sliding way, and a spring is sleeved outside the sliding rod; and a force application hole is formed in the position, corresponding to the insertion block, below the base. And a protective cover is arranged outside the pressure-driven opening and closing wire clamp.
The invention has the advantages that: when a lightning strike occurs, the current melts the stop block, the baffle is upwards popped out under the action of the pop-up spring, the upper binding post is driven to upwards move, and then the inserting block is pressed to upwards move, because the contact surface of the inserting block and the power supply side electrode is a straight surface, the connection is always kept, and the contact surface of the inserting block and the power utilization side electrode is an inclined surface, therefore, the inserting block rises, the disconnection of the inserting block and the power utilization side electrode is caused, and thus, the lightning strike current is conducted with the grounding end through the lightning arrester, and meanwhile, the connection with the power utilization end is disconnected, and further, the three-dimensional iron core transformer connected with the power utilization end is protected.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of the invention in cooperation with a pressure-driven opening and closing wire clamp.
Detailed Description
The invention is described in detail with reference to the drawings, as shown in the drawings, the invention comprises a shell 12, an umbrella cover is arranged outside the shell, an insulating support 19 is arranged in the shell 12, and a multilayer zinc oxide resistor disc 18 is arranged in the insulating support 19;
a concave ring is arranged on the inner wall of the upper end of the insulating support body, a stop block 13 made of low-temperature alloy is embedded into the concave ring, a baffle plate 15 is arranged below the stop block, an ejecting spring 14 and a zinc oxide resistance sheet 18 are arranged below the baffle plate, an upper binding post 16 is fixed above the baffle plate 15, and the lower part of the zinc oxide resistance sheet is connected with a lower electrode 17;
the wire clamp comprises a base 1, wherein coaxial through holes are formed in two sides of the base 1, and a power supply side electrode 2 and a power utilization side electrode 3 are embedded into the through holes; a threaded through hole 7 is formed above the base, threads are formed on the outer side of the sliding seat 6, the sliding seat 6 is screwed in the threaded through hole 7, and a slide way 8 is arranged in the middle of the sliding seat 6; one end of the plug-in block 4 is a straight surface, the other end is an inclined surface, the surface of the power supply side electrode corresponding to the plug-in block is a straight surface 21, and the surface of the power utilization side electrode corresponding to the plug-in block is an inclined surface 31; the insertion block 4 is provided between the power supply side electrode 2 and the power consumption side electrode 3; a sliding rod 5 is fixedly arranged above the insertion block, the sliding rod 5 is inserted into the slideway 8, and a spring 9 is sleeved outside the sliding rod 5; and a force application hole 10 is formed in the position, corresponding to the insertion block, below the base.
The inclined angle of the inclined plane is 45 degrees.
And a protective cover 11 is arranged on the outer side of the wire clamp.
The base is cylindrical.
The axis of the force application hole is overlapped with the axis of the sliding rod.
The spring force of the ejection spring 14 is much larger than the spring force of the spring 9
When lightning strike occurs, the current melts the stop block 13, the baffle plate 15 is upwards popped out under the action of the pop-up spring to drive the upper wiring terminal 16 to upwards move, and further the insertion block 4 is pressed to upwards move, and the insertion block is always kept connected with the power supply side electrode because the contact surface of the insertion block and the power supply side electrode is a straight surface, and the contact surface of the insertion block and the power utilization side electrode is an inclined surface, so that the insertion block rises to cause the disconnection of the insertion block and the power utilization side electrode, and thus, the lightning strike current is conducted with the grounding terminal through the lightning arrester, and meanwhile, the connection with the power utilization terminal is disconnected. The power utilization end is connected with the three-dimensional iron core transformer.
The low-temperature melting alloy is bismuth-tin low-melting alloy, and the melting temperature of the low-temperature melting alloy is 150 ℃.
Claims (3)
1. The utility model provides a lightning-arrest contact for three-dimensional roll iron core transformer which characterized in that: the device comprises a shell, wherein an umbrella sleeve is arranged outside the shell, an insulating support body is arranged in the shell, and a plurality of layers of zinc oxide resistance cards are arranged in the insulating support body; the inner wall of the upper end of the insulating support body is provided with a concave ring, a stop block made of low-temperature alloy is embedded into the concave ring, a baffle is arranged below the stop block, a pop-up spring and a zinc oxide resistance chip are arranged below the baffle, an upper binding post is fixed above the baffle, and the lower part of the zinc oxide resistance chip is connected with a lower electrode.
2. The lightning protection contact for the three-dimensional wound core transformer according to claim 1, wherein: the upper wiring terminal is inserted into a force application hole of the pressure-driven opening and closing wire clamp and is abutted against the lower part of the insertion block; the pressure-driven opening and closing wire clamp comprises a base, wherein coaxial through holes are formed in two sides of the base, and a power supply side electrode and a power utilization side electrode are embedded into the through holes; a threaded through hole is formed above the base, threads are arranged on the outer side of the sliding seat, the sliding seat is screwed in the threaded through hole, and a slide way is arranged in the middle of the sliding seat; one end of the insertion block is a straight surface, the other end of the insertion block is an inclined surface, the surface of the power supply side electrode corresponding to the insertion block is a straight surface, and the surface of the power utilization side electrode corresponding to the insertion block is an inclined surface; the insertion block is arranged between the power supply side electrode and the power utilization side electrode; a sliding rod is arranged above the inserting block and inserted into the sliding way, and a spring is sleeved outside the sliding rod; and a force application hole is formed in the position, corresponding to the insertion block, below the base.
3. The lightning protection contact for the three-dimensional wound core transformer according to claim 1, wherein: and a protective cover is arranged outside the pressure-driven opening and closing wire clamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363145.7A CN110911142A (en) | 2019-12-26 | 2019-12-26 | Lightning-protection contact for three-dimensional wound core transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363145.7A CN110911142A (en) | 2019-12-26 | 2019-12-26 | Lightning-protection contact for three-dimensional wound core transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110911142A true CN110911142A (en) | 2020-03-24 |
Family
ID=69827794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911363145.7A Pending CN110911142A (en) | 2019-12-26 | 2019-12-26 | Lightning-protection contact for three-dimensional wound core transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110911142A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112349500A (en) * | 2020-10-21 | 2021-02-09 | 衢州学院 | Lightning-protection contact and transformer |
-
2019
- 2019-12-26 CN CN201911363145.7A patent/CN110911142A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112349500A (en) * | 2020-10-21 | 2021-02-09 | 衢州学院 | Lightning-protection contact and transformer |
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