CN201918720U - Neutral point grounding resistor capable of removing arc flashover - Google Patents
Neutral point grounding resistor capable of removing arc flashover Download PDFInfo
- Publication number
- CN201918720U CN201918720U CN2010206224126U CN201020622412U CN201918720U CN 201918720 U CN201918720 U CN 201918720U CN 2010206224126 U CN2010206224126 U CN 2010206224126U CN 201020622412 U CN201020622412 U CN 201020622412U CN 201918720 U CN201918720 U CN 201918720U
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- resistance
- corner bracket
- earth
- resistor
- coiling
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Abstract
The utility model discloses a neutral point grounding resistor capable of removing arc flashover, which comprises an outer box, more than one resistor corner bracket, a plurality of electric supporting insulators, more than one group of resistor unit, a plurality of resistor fixing devices and more than one partial pressure connecting conductor, wherein the resistor corner brackets are erected inside the outer box through the plurality of electric supporting insulators so as to lead the resistor corner brackets to be in electric insulation with one another; the fixing devices are used for fixing the resistor units on the resistor corner brackets correspondingly; and all the resistor units are connected in series, and furthermore, the resistor units and the resistor corner brackets are electrically connected by the partial pressure connecting conductors so as to form same potential at resistance median parts of the serial resistor units, therefore, each resistor corner bracket has a voltage between total voltages, so that the highest potential difference between the resistor corner bracket and the resistor unit can be reduced, thereby avoiding the arc flashover between the resistor corner bracket and the resistor unit.
Description
Technical field
The utility model relates to a kind of grounding resistor, especially refer to a kind of neutral resistance of eliminating the electric arc flashover, the main potential difference that reduces resistance corner bracket and resistance unit, produce the high-tension electric arc flashover of unusual transient state when avoiding the transformer grounding fault, do not have ground connection burning because of neutral point when causing noise and resistance unit circuit fusing to cause this transformer grounding fault indirectly then.
Background technology
Grounding resistor is to be serially connected with the neutral ground end of high pressure or extra-high voltage transformer as earth resistance, and purpose is to protect this transformer, sees also Fig. 5, is known grounding resistor 60 stereograms, wherein includes:
One outer container 61;
One resistance corner bracket 62 is set up in this outer container 61;
A plurality of being electrically insulated supported insulator 63, is positioned in this outer container 61, places upper and lower each four corner of this resistance corner bracket 62 respectively, and this resistance corner bracket 62 is erected, and makes this resistance corner bracket 62 electrically isolate from this outer container 61;
A plurality of resistive elements 64, respectively by lead with its total series connection, and be installed on this resistance corner bracket 62;
A plurality of fixtures 65, respectively this resistive element 64 is fixed on this resistance corner bracket 62 respectively, and these a plurality of resistive elements 64 all are electrically insulated with this resistance corner bracket 62.
Because transformer is under the high-pressure situations, this grounding resistor 60 can because of this high pressure cause these a plurality of resistive elements 64 because of and 62 of this resistance corner brackets high potential difference and distance are arranged closely, and then generation electric arc flashover, constantly produce a thundering noise, again what is more in this transformer generation earth fault, this grounding resistor 60 is in the transient state high pressure, many places electric arc flashover can take place with this resistive element 64 in these grounding resistor 60 resistance corner brackets 62, cause these a plurality of resistive elements 64 to make resistance value less than original resistance value by these resistance corner bracket 62 short circuits, the fault current that fault is produced explodes and is several times as much as rated value and with these resistive element 64 fusing, further make this transformer neutral ground end can't ground connection and burn, so grounding resistor 60 has improved necessity really.
The utility model content
Because above-mentioned existing grounding resistor technological deficiency, main purpose of the present utility model is to propose a kind of neutral resistance of eliminating the electric arc flashover.
Desiring to reach the employed major technique means of above-mentioned purpose is to make the neutral resistance of this elimination electric arc flashover include:
One outer container;
An above resistance corner bracket is set up in this outer container inside;
A plurality of support insulators that are electrically insulated, an end is fixed in this outer container inboard respectively, and the other end is fixed in each resistance corner bracket outside, each resistance corner bracket is erected in this outer container inside, and made each resistance corner bracket electrically isolate from this outer container;
One group of above earth resistance unit is arranged at respectively on each corresponding resistance corner bracket, and wherein each winding earth resistance unit pack contains the earth resistance of a plurality of mutual series connection, and the series connection mutually again of each winding earth resistance unit;
A plurality of fixtures are fixed in each earth resistance unit on the corresponding resistance corner bracket respectively, and make these a plurality of earth resistances and the insulation of this resistance corner bracket;
An above dividing potential drop bonding conductor is electrically connected on corresponding resistance corner bracket and this earth resistance unit wherein between the earth resistance.
Because this dividing potential drop bonding conductor is electrically connected between the earth resistance and this resistance corner bracket at total resistance value place, according to the dividing potential drop theorem, the current potential of this resistance corner bracket should be between the potential minimum and maximum potential of this earth resistance unit, the maximum potential that so can reduce between this resistance corner bracket and this earth resistance is poor, avoids the generation of the electric arc flashover that high potential difference causes.
So, the maximum potential that can lower this earth resistance unit and this resistance corner bracket once more is poor, can make this potential difference be lower than the voltage threshold that produces the electric arc flashover, to eliminate the electric arc flashover.
Preferably, in this outer container, fold and establish two resistance corner brackets, and folder is established a plurality of support insulators that are electrically insulated between two resistance corner brackets.
Preferably, this connects earth resistance that conduction connects and organizes half earth resistance of resistance unit total resistance value for this.
Preferably, each earth resistance of each unit, winding ground respectively includes:
One insulation coiling insulator;
The coiling of one resistance is twined multiturn on its outer wall surface along this insulation coiling insulator; And
Two fixtures are fixed in this resistance coiling on this insulation coiling insulator respectively.
Preferably, each earth resistance of each unit, winding ground respectively includes:
One insulation coiling insulator;
The coiling of one resistance is twined multiturn on its outer wall surface along this insulation coiling insulator; And
Two fixtures are fixed in this resistance coiling on this insulation coiling insulator respectively.
Preferably, this dividing potential drop bonding conductor one end is that the fixture by the earth resistance that is electrically connected with it is fixed on this insulation coiling insulator, and is connected with this resistance coiling contact, and the other end then is fixed on this resistance corner bracket by this fixture.
Preferably, this dividing potential drop bonding conductor one end is that the fixture by the earth resistance that is electrically connected with it is fixed on this insulation coiling insulator, and is connected with this resistance coiling contact, and the other end then is fixed on this resistance corner bracket by this fixture.
Description of drawings
Fig. 1: be the stereogram of the utility model grounding resistor.
Fig. 2: be the local amplification stereogram of Fig. 1.
Fig. 3: be the stereogram of this earth resistance.
Fig. 4: be second preferred embodiment of the present utility model.
Fig. 5: be the stereogram of known grounding resistor.
The main element symbol description
10 grounding resistors, 11 outer containers
The 12 resistance corner brackets 13 support insulator that is electrically insulated
20 earth resistance unit, 21 earth resistances
The coiling of 211 insulation coiling insulators, 212 resistance
213 fixtures, 30 fixtures
40 dividing potential drop bonding conductors, 60 grounding resistors
61 outer containers, 62 resistance corner brackets
63 are electrically insulated supports insulator 64 earth resistances
65 fixtures.
Embodiment
See also Fig. 1, Fig. 2 and Fig. 3, be respectively the utility model grounding resistor 10 first preferred embodiment stereograms, part enlarged drawing and earth resistance stereogram, it includes:
One outer container 11;
An above resistance corner bracket 12 is set up in this outer container 11 inside, is single resistance corner bracket 12 in present embodiment;
A plurality of being electrically insulated supported insulator 13, is arranged at respectively between this outer container 11 and each the resistance corner bracket 12, each resistance corner bracket 12 erected in this outer container 11 inside, and each resistance corner bracket 12 is electrically insulated with this outer container 11;
One group of above earth resistance unit 20 is arranged at respectively on each corresponding resistance corner bracket 12, and wherein each winding earth resistance unit 20 includes the earth resistance 21 of a plurality of mutual series connection, and the series connection mutually again of each winding earth resistance unit 20; Wherein each earth resistance 21 includes an insulation coiling insulator 211,212 and two fixtures 213 of resistance coiling; Wherein this resistance coiling 212 is twined multiturns on its outer wall surface along this insulation coiling insulator 211, and by these two fixtures 213 this resistance 212 2 ends that wind the line is individually fixed in this insulation and winds the line on insulator 211;
A plurality of fixtures 30 are fixed in each earth resistance unit 20 on the corresponding resistance corner bracket 12 respectively, and these a plurality of earth resistances 21 are all insulated with this resistance corner bracket 12;
An above dividing potential drop bonding conductor 40, one end of each dividing potential drop bonding conductor 40 is electrically connected to corresponding resistance corner bracket 12, the other end then is electrically connected on the wherein earth resistance 21 on the corresponding resistance corner bracket 12, earth resistance 21 equipotentials that each resistance corner bracket 12 is electrically connected with it; In present embodiment, comprise a dividing potential drop bonding conductor 40, preferably, the resistance value of the earth resistance 12 that these dividing potential drop bonding conductor 40 1 ends are electrically connected, for this organizes half that is connected in series earth resistance 21 total resistance values, and an end of this dividing potential drop bonding conductor 40 is that the fixture 23 by the earth resistance 21 that is electrically connected with it is fixed on this insulation coiling insulator 211, and is connected with these resistance coiling 212 contacts, and the other end then is fixed on this resistance corner bracket 12 by this fixture 30.
Because this dividing potential drop bonding conductor 40 is electrically connected on wherein between the earth resistance 21 and this resistance corner bracket 12, according to the dividing potential drop theorem, these resistance corner bracket 12 current potentials should be between the potential minimum and maximum potential of this earth resistance unit 20, therefore when the maximum potential missionary society of this resistance corner bracket 12 and these earth resistance unit 20 each points is in zero potential less than this resistance corner bracket 12 and the maximum potential difference of this each earth resistance unit 20, present embodiment is selected respectively all-in resistance 1/2nd value places of the earth resistance 21 of group serial connection again, as the method for selecting this dividing potential drop bonding conductor 40 is electrically connected this resistance corner bracket 12 and specific this earth resistance 21; Meaning promptly, after this principle is selected, these resistance corner bracket 12 current potentials are 1/2nd current potentials of the earth resistance unit 20 of this series connection, so, this resistance corner bracket 12 is all 1/2nd of combined potential difference with the maximum potential and the potential minimum of this earth resistance unit 20, promptly can reduce the potential difference of this resistance corner bracket 12 and this earth resistance unit 20 to eliminate the generation of electric arc flashover by this utility model.
Illustrational, therefore the voltage threshold that generally produces the electric arc effect must if just this resistance corner bracket 12 is reduced to below the 21KV with the maximum potential difference of this earth resistance unit 20, can eliminate the electric arc effect greater than for more than the 21KV.
When the utility model grounding resistor 10 pours into the high pressure of 39.8KV, the utility model resistance corner bracket 12 current potentials are 19.9KV, and these earth resistance unit 20 ceiling voltages are 39.8KV, minimum voltage is 0KV, this resistance corner bracket 12 is 19.9KV with the maximum potential difference of this earth resistance unit 20, less than 21KV, so promptly do not have the electric arc flashover and take place.
See also Fig. 4, be the second preferred embodiment stereogram of the present utility model, compare first preferred embodiment in these outer container 11 folded two resistance corner brackets 12 of establishing, be provided with two winding earth resistance unit 20 in each resistance corner bracket, its quantity can be earth resistance 21 quantity of single group resistance corner bracket 12 of first preferred embodiment.Again, be folded with to be electrically insulated between the two folded resistance corner brackets of establishing 12 and support insulator 13, two resistance corner brackets 12 are electrically insulated; Therefore outside two resistance corner brackets 12 were electrically insulated each other, also each was electrically insulated with this outer container 11.Also include two dividing potential drop bonding conductors 40 in the present embodiment, respectively corresponding resistance corner bracket 12 is electrically connected with an earth resistance 21 wherein, preferably can select to be electrically connected to half earth resistance 21 of these winding earth resistance unit 20 total resistance values.
So, according to the dividing potential drop theorem, 20 of two groups of series resistance unit get an intermediate voltage, this magnitude of voltage can be between total voltage ceiling voltage and minimum voltage, this two resistance corner bracket 12 magnitude of voltage but also can be between intermediate voltage and ceiling voltage wherein not only, another resistance corner bracket 12 magnitudes of voltage can be between between intermediate voltage and minimum voltage, so be about to the combined potential difference and be pressed into quartile, through making wantonly two adjacent branch potential differences in the quartile after the design all less than the voltage threshold of this generation electric arc effect.
Again when the first embodiment grounding resistor of the present utility model when pouring into the high pressure of 50KV, make the ceiling voltage 50KV of the earth resistance unit 20 that this resistance corner bracket 12 is connected in series with this group and the potential difference of minimum voltage 0V be all 25KV after the dividing potential drop of the utility model resistance corner bracket 12, because surpassed 21KV, so still can produce the electric arc flashover, can carry out one second divided voltage this moment again, promptly as described in above-mentioned second embodiment, this earth resistance unit 20 is divided into two groups to be set up in respectively on the two resistance corner brackets 12, this moment, the both end voltage of two winding earth resistance unit 20 was respectively 50KV to 25KV and 25KV to 0V, two resistance corner brackets 12 are respectively 37.5KV and 12.5KV, two resistance corner brackets 12 with each under earth resistance unit 20 is the highest reduces to 12.5KV much smaller than 21KV with the potential minimum differential, so and eliminated electric arc flashover between this resistance corner bracket 12 and this earth resistance unit 20.
In sum, because the maximum potential difference of this resistance corner bracket and this earth resistance unit has reduced, it is poor further to reduce the maximum potential of this earth resistance unit and this resistance corner bracket again in second embodiment again, so can avoid causing electric arc flashover between this resistance corner bracket and this earth resistance unit because of high potential difference, further eliminate the huge noise that causes because of the electric arc flashover, the utility model also solved the problem that causes this grounding resistor and transformer to damage because of the electric arc flashover, so can improve the technological deficiency of grounding resistor really.
Claims (7)
1. a neutral resistance of eliminating the electric arc flashover is characterized in that, the neutral resistance of this elimination electric arc flashover includes:
One outer container;
An above resistance corner bracket is set up in this outer container inside;
A plurality of support insulators that are electrically insulated, an end is fixed in this outer container inboard respectively, and the other end is fixed in each resistance corner bracket outside, each resistance corner bracket is erected in this outer container inside, and made each resistance corner bracket electrically isolate from this outer container;
One group of above earth resistance unit is arranged at respectively on each corresponding resistance corner bracket, and wherein each winding earth resistance unit pack contains the earth resistance of a plurality of mutual series connection, and the series connection mutually again of each winding earth resistance unit;
A plurality of fixtures are fixed in each earth resistance on each resistance corner bracket respectively, and make these a plurality of earth resistances and the insulation of each resistance corner bracket;
An above dividing potential drop bonding conductor is electrically connected on corresponding resistance corner bracket and this earth resistance unit wherein between the earth resistance.
2. the neutral resistance of elimination electric arc flashover according to claim 1 is characterized in that, fold in this outer container and establish two resistance corner brackets, and folder is established a plurality of support insulators that are electrically insulated between two resistance corner brackets.
3. the neutral resistance of elimination electric arc flashover according to claim 1 and 2 is characterized in that, this connects earth resistance that conduction connects and organizes half earth resistance of resistance unit total resistance value for this.
4. the neutral resistance of elimination electric arc flashover according to claim 1 and 2 is characterized in that, each earth resistance of each unit, winding ground respectively includes:
One insulation coiling insulator;
The coiling of one resistance is twined multiturn on its outer wall surface along this insulation coiling insulator; And
Two fixtures are fixed in this resistance coiling on this insulation coiling insulator respectively.
5. the neutral resistance of elimination electric arc flashover according to claim 3 is characterized in that, each earth resistance of each unit, winding ground respectively includes:
One insulation coiling insulator;
The coiling of one resistance is twined multiturn on its outer wall surface along this insulation coiling insulator; And
Two fixtures are fixed in this resistance coiling on this insulation coiling insulator respectively.
6. the neutral resistance of elimination electric arc flashover according to claim 4, it is characterized in that, this dividing potential drop bonding conductor one end is that the fixture by the earth resistance that is electrically connected with it is fixed on this insulation coiling insulator, and be connected with this resistance coiling contact, the other end then is fixed on this resistance corner bracket by this fixture.
7. the neutral resistance of elimination electric arc flashover according to claim 5, it is characterized in that, this dividing potential drop bonding conductor one end is that the fixture by the earth resistance that is electrically connected with it is fixed on this insulation coiling insulator, and be connected with this resistance coiling contact, the other end then is fixed on this resistance corner bracket by this fixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206224126U CN201918720U (en) | 2010-11-19 | 2010-11-19 | Neutral point grounding resistor capable of removing arc flashover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206224126U CN201918720U (en) | 2010-11-19 | 2010-11-19 | Neutral point grounding resistor capable of removing arc flashover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201918720U true CN201918720U (en) | 2011-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206224126U Expired - Fee Related CN201918720U (en) | 2010-11-19 | 2010-11-19 | Neutral point grounding resistor capable of removing arc flashover |
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| Country | Link |
|---|---|
| CN (1) | CN201918720U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468649A (en) * | 2010-11-19 | 2012-05-23 | 嵩益电机股份有限公司 | Neutral point grounding resistor with function of eliminating electric arc flashover |
| CN103730853A (en) * | 2013-12-27 | 2014-04-16 | 苏州市龙源电力科技股份有限公司 | Grounding resistor cabinet |
| CN107180692A (en) * | 2017-05-05 | 2017-09-19 | 中国科学院合肥物质科学研究院 | A kind of current-limiting resistance for high power DC high voltage power supply |
-
2010
- 2010-11-19 CN CN2010206224126U patent/CN201918720U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468649A (en) * | 2010-11-19 | 2012-05-23 | 嵩益电机股份有限公司 | Neutral point grounding resistor with function of eliminating electric arc flashover |
| CN103730853A (en) * | 2013-12-27 | 2014-04-16 | 苏州市龙源电力科技股份有限公司 | Grounding resistor cabinet |
| CN107180692A (en) * | 2017-05-05 | 2017-09-19 | 中国科学院合肥物质科学研究院 | A kind of current-limiting resistance for high power DC high voltage power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110803 Termination date: 20161119 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |