CN209766158U - Transformer neutral point direct current magnetic biasing suppression inductance resistor - Google Patents
Transformer neutral point direct current magnetic biasing suppression inductance resistor Download PDFInfo
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- CN209766158U CN209766158U CN201920891852.2U CN201920891852U CN209766158U CN 209766158 U CN209766158 U CN 209766158U CN 201920891852 U CN201920891852 U CN 201920891852U CN 209766158 U CN209766158 U CN 209766158U
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Abstract
The utility model discloses a transformer neutral point DC magnetic biasing restraining inductance resistor, wherein an insulating column is fixedly connected below a C-shaped bottom ring; arranging a plurality of layers of spiral resistance cards above the C-shaped bottom ring; an inter-resistor-sheet insulation isolation block is arranged between the spiral resistors; respectively penetrating insulating isolation block fixing screw rods into through holes at two ends of an insulating isolation block between the resistor sheets for fixing; the outer ring of spiral resistance ring sheet is connected with the inner ring of spiral resistance sheet through a transition sheet of the outer ring connected with the inner ring after each spiral disk is wound for a plurality of circles; the inner ring spiral resistance cards are also connected with the outer ring spiral resistance cards through transition cards of which the inner ring is connected with the outer ring after each spiral disk is wound for a plurality of circles, and the inner ring spiral resistance cards are connected through inner ring cross connection sheets when the inner ring spiral resistance cards are crossed; the outer ring spiral resistance cards are connected through the outer ring cross connecting sheet when crossing; on the premise of ensuring that the neutral point grounding inductance resistor has the inductance and resistance value required by engineering, the volume of the neutral point grounding inductance resistor of the transformer is reduced, and the engineering application requirement is met.
Description
Technical Field
The utility model relates to an electric power system transformer relates to electric power system and restraines transformer neutral point of direct current magnetic biasing and uses resistor with ground, concretely relates to transformer neutral point direct current magnetic biasing restraines resistor belongs to transmission equipment technical field.
Background
In a single-stage power transmission mode of an extra-High Voltage Direct Current (HVDC) power transmission system, a dc bias current flows into a neutral point of a power transformer of each substation in a wide range around a ground electrode thereof. The direct current bias current can make the iron core magnetization of the transformer, the current waveform distortion, the vibration and the noise aggravated, and bring about extremely adverse effects to an alternating current system. In existing substations, the transformer neutral point is typically directly grounded through a reactor. In order to improve the safe operation level of the transformer, namely effectively inhibit the direct current magnetic biasing current of the neutral point of the transformer and reliably protect the neutral line of the transformer from damaging equipment insulation due to high-current overvoltage, a grounding loop series resistance device is required to be arranged at the neutral point of the transformer substation influenced by the direct current magnetic biasing.
Patent 201620320438.2 "a novel cylindrical spiral inductance resistance" discloses a novel cylindrical spiral inductance resistance which is suitable for grounding of a neutral point of a transformer in an extra-high voltage direct current transmission system transformer substation, has small volume and large power, and effectively inhibits the direct current magnetic bias current of the neutral point of the transformer, and is combined with an inductor and a resistor into a whole. However, the inductive resistor is wound by a single spiral, so that the inductive resistance and the resistance value required by engineering are achieved at the same time, and the volume of the inductive resistor is more than one time of that of the existing reactance resistance loop system, so that the inductive resistor cannot be applied to engineering.
Therefore, the size of the neutral point grounding inductance resistor of the transformer is reduced, the neutral point grounding inductance resistor is ensured to have the inductance and resistance value required by engineering, and the technical problem to be solved by adopting the inductance resistor of the neutral point direct-current magnetic bias suppression resistor of the transformer is solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects of the prior art, and the utility model realizes a transformer neutral point DC magnetic biasing restraining inductance resistor which is characterized by comprising a spiral resistance chip, an insulating column, an insulating isolation block between resistance chips, a C-shaped bottom ring and an insulating isolation block fixing spiral rod; the insulating column is fixedly connected below the C-shaped bottom ring; a plurality of layers of spiral resistance sheets are arranged above the C-shaped bottom ring; insulating isolation blocks between the resistor sheets are arranged between the spiral resistor sheets; the spiral resistance chip also comprises an inner ring spiral resistance chip, an outer ring spiral resistance chip, a transition chip of which the inner ring is connected with the outer ring, an outer ring cross connecting sheet, a transition chip of which the outer ring is connected with the inner ring, and an inner ring cross connecting sheet; the outer ring spiral resistance chip is connected with the inner ring spiral resistance chip through a transition chip which is connected with the inner ring through the outer ring after each spiral disk is wound for a plurality of circles; the inner ring spiral resistance card is also connected with the outer ring spiral resistance card through a transition piece of which the inner ring is connected with the outer ring after a plurality of turns of each spiral disc, and the inner ring spiral resistance cards are connected through an inner ring cross connecting piece when crossing; the outer ring spiral resistance sheets are connected through an outer ring cross connecting sheet when being crossed; the lowermost circle of the outer ring spiral resistance sheet is connected with a resistance sheet joint arranged on the C-shaped bottom ring.
Furthermore, the C-shaped bottom ring also comprises a bottom insulating column connecting joint, a C-shaped bottom ring body and a C-shaped bottom ring insulating isolation block; a resistor disc joint is fixed at one end of the C-shaped bottom ring body, and a bottom insulating column connecting joint is arranged below the C-shaped bottom ring body; a C-shaped bottom ring insulating isolation block is arranged above the C-shaped bottom ring body; the bottom insulating column connecting joints and the C-shaped bottom ring insulating isolation blocks are arranged in a one-to-one correspondence manner from top to bottom; two ends of the bottom insulating column connecting joint and two ends of the C-shaped bottom ring insulating isolation block are respectively provided with a through hole; the insulating isolation block fixing screw rod penetrates into the through hole; the insulating isolation block fixing screw rod longitudinally connects and fixes the bottom insulating column connecting joint, the C-shaped bottom ring insulating isolation block and the insulating isolation block between the resistor sheets.
Furthermore, at the opening of the C-shaped bottom ring body, an inlet wire end is arranged on the outer ring spiral resistance sheet at the bottommost layer; and an outlet end is arranged on the outer ring spiral resistance sheet on the uppermost layer at the opening of the C-shaped bottom ring body.
Furthermore, the incoming terminal and the outgoing terminal can be connected with the phase sequence of the power supply in an interchangeable way.
Furthermore, the spiral resistance sheet is formed by bending section steel.
furthermore, the number of layers of the spiral resistance sheet is 20-500.
The utility model aims to solve the technical problem that under the inductive reactance and the resistance value prerequisite that guarantee neutral point ground connection inductance resistance has the engineering needs, reduce the volume of the neutral point ground connection inductance resistance of transformer, satisfy engineering application needs. The technical effect of the utility model lies in utilizing inner circle spiral resistance card, outer lane spiral resistance card end to end structure, it is big to have overcome the potential difference between inner circle spiral resistance card and the outer lane spiral resistance card, insulating difficult technical difficulty. Meanwhile, the C-shaped bottom ring is a part of the spiral resistor and is also an installation base of the spiral resistor, and the problem that the insulation between the base and the resistor is easy to break down due to the rise of potential level of the base caused by eddy current is solved. The utility model discloses a two above-mentioned important measures, the effectual inductance resistance volume that has reduced have realized the engineering and have used.
Drawings
Fig. 1 is a schematic structural view of the present invention;
Fig. 2 is a schematic diagram of the winding structure of the inner ring spiral resistance card and the outer ring spiral resistance card of the present invention;
fig. 3 is a schematic structural view of the C-shaped bottom ring of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
With reference to fig. 1 and fig. 2, the present embodiment provides a transformer neutral point dc magnetic bias suppression inductive resistor, which includes a spiral resistor sheet 200, an insulating column 1, an inter-resistor-sheet insulating spacer block 3, a C-shaped bottom coil 400, and an insulating spacer block fixing screw rod 5; an insulating column 1 is fixedly connected below the C-shaped bottom ring 400 to form insulation at the lower part of the transformer neutral point direct-current magnetic bias suppression inductance resistor; arranging a plurality of layers of spiral resistance sheets 200 above the C-shaped bottom ring 400; an inter-resistor-sheet insulation isolation block 3 is arranged between the spiral resistor sheets 200; the main structure of the transformer neutral point direct current magnetic biasing restraining inductance resistor is formed by respectively penetrating insulating isolation block fixing screw rods 5 into through holes at two ends of an insulating isolation block 3 between resistor sheets for fixing, the structure utilizes an end-to-end connection structure of the spiral resistor sheets 200, the technical difficulties of large potential difference and difficult insulation between the spiral resistor sheets 200 are overcome, a C-shaped bottom ring 400 is formed and is a part of the spiral resistor and an installation base of the spiral resistor sheets, the problem that the insulation between the base and the resistor sheets is easy to break down due to eddy current and potential rise of the base is solved, and in order to solve the technical problems, the spiral resistor sheet 200 further comprises an inner ring spiral resistor sheet 201, an outer ring spiral connecting sheet 202, a transition sheet 203 with an inner ring connected to an outer ring, an outer ring cross 204, a transition sheet 205 with an outer ring connected to an inner ring, and an inner ring cross connecting sheet 206; the outer ring spiral resistance sheet 202 is connected with the inner ring spiral resistance sheet 201 through a transition sheet 205 of the outer ring connected with the inner ring after a plurality of turns of each spiral disc (in the embodiment, two turns can be selected at will, and the number of turns can be selected mainly by parameters such as eddy current, potential position and the like in practical application); the inner ring spiral resistance card 201 is also connected with the outer ring spiral resistance card 202 through a transition card 203 which is connected with the outer ring at the inner ring after a plurality of turns of each spiral disc (two turns in the embodiment, the number of turns can be selected at will in practical application, and parameters such as eddy current, potential and the like are mainly selected), and is connected through an inner ring cross connecting sheet 206 when the inner ring spiral resistance card 201 is crossed; when the outer ring spiral resistance cards 202 are crossed, the outer ring spiral resistance cards are connected through an outer ring cross connecting sheet 204; the lowermost turn of outer-ring spiral resistance sheet 202 is connected to resistance sheet joint 401 provided on C-shaped bottom ring 400.
As shown in fig. 3, the C-shaped bottom ring 400 further includes a bottom insulation column connection joint 402, a C-shaped bottom ring body 403, and a C-shaped bottom ring insulation isolation block 404; a resistor disc joint 401 is fixed at one end of the C-shaped bottom ring body 403, and a bottom insulating column connecting joint 402 is arranged below the C-shaped bottom ring body 403; a C-shaped bottom ring insulating isolation block 404 is arranged above the C-shaped bottom ring body 403; the bottom insulating column connecting joints 402 and the C-shaped bottom ring insulating isolation blocks 403 are arranged in an up-down one-to-one correspondence manner; two ends of the bottom insulating column connecting joint 402 and two ends of the C-shaped bottom ring insulating isolation block 403 are respectively provided with a through hole; an insulating isolation block fixing screw rod 5 penetrates through the through hole; the insulating isolation block fixing screw rod 5 longitudinally connects and fixes the bottom insulating column connecting joint 404, the C-shaped bottom ring insulating isolation block 403 and the inter-resistor-sheet insulating isolation block 3. The C-shaped bottom ring 40 structure is a key structure for solving the problem that the insulation between the base and the resistor sheet is easy to break down due to the rise of potential position of the base caused by eddy current.
Referring to fig. 1 and fig. 3, at the opening of the C-shaped bottom ring body 403, an inlet terminal 6 is disposed on the outer ring spiral resistance card 202 at the bottom layer; an outlet terminal 5 is arranged on the outer ring spiral resistance card 202 on the uppermost layer at the opening of the C-shaped bottom ring body 403; the line end 6 and the line outlet end 5 are used for being connected with a power supply for use, certainly, the line inlet end 6 and the line outlet end 5 can be connected with the phase sequence of the power supply in an interchangeable mode, the use is not influenced, and the phase sequence is mainly selected according to the directions of eddy currents and potential positions.
The spiral resistance chip 200 in this embodiment is formed by winding a steel bar, and the number of layers of the spiral resistance chip 200 is 20 to 500.
As a preferred embodiment of the present invention, it is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention, and that the scope of the present invention is also encompassed by the present invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A transformer neutral point direct current magnetic bias suppression inductance resistor is characterized by comprising a spiral resistance chip, an insulating column, an insulating isolation block between resistance chips, a C-shaped bottom ring and an insulating isolation block fixing spiral rod; the insulating column is fixedly connected below the C-shaped bottom ring; a plurality of layers of spiral resistance sheets are arranged above the C-shaped bottom ring; insulating isolation blocks between the resistor sheets are arranged between the spiral resistor sheets; the spiral resistance chip also comprises an inner ring spiral resistance chip, an outer ring spiral resistance chip, a transition chip of which the inner ring is connected with the outer ring, an outer ring cross connecting sheet, a transition chip of which the outer ring is connected with the inner ring, and an inner ring cross connecting sheet; the outer ring spiral resistance chip is connected with the inner ring spiral resistance chip through a transition chip which is connected with the inner ring through the outer ring after each spiral disk is wound for a plurality of circles; the inner ring spiral resistance card is also connected with the outer ring spiral resistance card through a transition piece of which the inner ring is connected with the outer ring after a plurality of turns of each spiral disc, and the inner ring spiral resistance cards are connected through an inner ring cross connecting piece when crossing; the outer ring spiral resistance sheets are connected through an outer ring cross connecting sheet when being crossed; the lowermost circle of the outer ring spiral resistance sheet is connected with a resistance sheet joint arranged on the C-shaped bottom ring.
2. The transformer neutral point dc magnetic bias suppression inductive resistor of claim 1, wherein said C-shaped bottom ring further comprises a bottom insulating column connection terminal, a C-shaped bottom ring body, a C-shaped bottom ring insulating spacer block; a resistor disc joint is fixed at one end of the C-shaped bottom ring body, and a bottom insulating column connecting joint is arranged below the C-shaped bottom ring body; a C-shaped bottom ring insulating isolation block is arranged above the C-shaped bottom ring body; the bottom insulating column connecting joints and the C-shaped bottom ring insulating isolation blocks are arranged in a one-to-one correspondence manner from top to bottom; two ends of the bottom insulating column connecting joint and two ends of the C-shaped bottom ring insulating isolation block are respectively provided with a through hole; the insulating isolation block fixing screw rod penetrates into the through hole; the insulating isolation block fixing screw rod longitudinally connects and fixes the bottom insulating column connecting joint, the C-shaped bottom ring insulating isolation block and the insulating isolation block between the resistor sheets.
3. The transformer neutral point direct current magnetic bias suppression inductive resistor as claimed in claim 2, wherein at the opening of said C-shaped bottom coil body, a wire inlet terminal is arranged on the outer ring spiral resistance sheet at the bottommost layer; and an outlet end is arranged on the outer ring spiral resistance sheet on the uppermost layer at the opening of the C-shaped bottom ring body.
4. The transformer neutral point dc bias suppressing inductive resistor of claim 3, wherein said incoming terminal and said outgoing terminal are interchangeable for connection to the phase sequence of a power source.
5. The transformer neutral point dc bias suppressing inductance resistor of claim 1, wherein said spiral resistor sheet is formed by bending a steel section.
6. The transformer neutral point dc bias suppressing inductance resistor of claim 1, wherein the number of layers of said spiral resistor sheet is 20-500.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920891852.2U CN209766158U (en) | 2019-06-13 | 2019-06-13 | Transformer neutral point direct current magnetic biasing suppression inductance resistor |
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| CN201920891852.2U CN209766158U (en) | 2019-06-13 | 2019-06-13 | Transformer neutral point direct current magnetic biasing suppression inductance resistor |
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| CN209766158U true CN209766158U (en) | 2019-12-10 |
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| CN201920891852.2U Active CN209766158U (en) | 2019-06-13 | 2019-06-13 | Transformer neutral point direct current magnetic biasing suppression inductance resistor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148504A (en) * | 2019-06-13 | 2019-08-20 | 上海久能机电制造有限公司 | A kind of transformer neutral point DC magnetic biasing inhibition inductive resistance device |
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2019
- 2019-06-13 CN CN201920891852.2U patent/CN209766158U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148504A (en) * | 2019-06-13 | 2019-08-20 | 上海久能机电制造有限公司 | A kind of transformer neutral point DC magnetic biasing inhibition inductive resistance device |
| CN110148504B (en) * | 2019-06-13 | 2024-02-27 | 上海久能机电制造有限公司 | Transformer neutral point DC magnetic bias suppression inductance resistor |
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