CN202260146U - Neutral point grounding electrode step voltage reducing device - Google Patents
Neutral point grounding electrode step voltage reducing device Download PDFInfo
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- CN202260146U CN202260146U CN2011203565015U CN201120356501U CN202260146U CN 202260146 U CN202260146 U CN 202260146U CN 2011203565015 U CN2011203565015 U CN 2011203565015U CN 201120356501 U CN201120356501 U CN 201120356501U CN 202260146 U CN202260146 U CN 202260146U
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- lead rod
- earth lead
- insulation
- step voltage
- described insulation
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Abstract
The utility model relates to a neutral point grounding electrode step voltage reducing device, which is characterized in that an insulation grounding lead rod is arranged between a grounding electrode embedded in the ground and a transformer neutral point catcher. The insulation grounding lead rod is composed of an intermediate conductive body and an insulation outer layer surrounding the intermediate conductive body, the C end of the intermediate conductive body of the insulation grounding lead rod is connected with the grounding electrode embedded in the ground, the S end of the intermediate conductive body of the insulation grounding lead rod is connected with the transformer neutral point catcher, and the depth of the part of the insulation grounding lead rod embedded in the ground is larger than or equal to the step distance 0.8m. The neutral point grounding electrode step voltage reducing device has the advantages of being capable of extending to be applied to grounding systems of various arresters, reducing step voltage around a grounding wire during the working process of the arresters, and enabling damage of the most dangerous area of the step voltage to people and livestock to be reduced to the minimum level.
Description
Technical field
The utility model relates to the grounding system technology in the power supply field, particularly a kind of device that reduces neutral ground utmost point step voltage.
Background technology
Relatively approach, contain the area of the more geological conditions of sandstone soil layer, rock for specific soil layers such as mines, by the current standard device, earth connection goes into to adopt below the ground does not have the bare wire of insulating requirements to be connected with earth electrode.In order to satisfy earth resistance R
E≤4
Requirement, usually adopting increases burial depth L and the physical dimension measure that strengthens earth electrode.Usually require about earth electrode burial depth L=1.5m, main purpose is to reduce the current density on the face of land through reducing grounding resistance, finally guarantees the safety of step voltage.But above measure effect is very little, lets the unconfined minimizing of grounding resistance can only become a kind of ideal.In 380/220 volt of electric power system, when single-phase earthing took place, through theoretical calculation, ground connection total current I was no more than 27.5A.When human body touches exposed neutral ground line; The electric current that the person will pass through is about 11 milliamperes, and when the electric shock time surpassed 10 seconds, human body had got into and has been difficult for the threshold of let go current zone; The installation code device of this earth electrode is not to be perfectly safe to ensure to personnel.
This earthing device has the contact injury the person except above-mentioned, around the neutral ground device, also exist another kind of potential hazard to the person----the step voltage injury.So-called step voltage be meant between people's bipod 0.8m apart from the time earth potential difference, the zone that step voltage is the most dangerous is in apart from earth electrode or earth connection 0.8m radius (earth electrode and grounding terminal are equipotential).When the rainy day system earth; The electric current that the step voltage at neutral ground utmost point place causes the person to pass through can be up to 76 milliamperes; This electric current can make electric shock person in 2 second time, get into to be difficult for the threshold of let go current zone; Can make the people reactions such as contraction of muscle, expiratory dyspnea, heart body disorder occur, electric shock person has been constituted fatal harm.
Summary of the invention
The purpose of the utility model provides a kind of closely device of step voltage of neutral ground line that reduces, and eliminates the most dangerous zone of step voltage, guarantees personal safety.
The purpose of the utility model realizes through following technical proposals:
The device of the reduction neutral ground utmost point step voltage of the utility model; It is characterized in that between buried grounding electrode and transformer neutral point catcher, being provided with insulation earth lead rod; Described insulation earth lead rod is made up of middle electric conductor and the insulating outer layer of surrounding this middle electric conductor; The C end of the middle electric conductor of described insulation earth lead rod is connected with buried grounding electrode; The S end of the middle electric conductor of described insulation earth lead rod is connected with the transformer neutral point catcher, and the vertical buried degree of depth of described insulation earth lead rod is more than or equal to steplength 0.8m.
The sub-assembly that the insulation earth lead rod II that described insulation earth lead rod is connected with the earth lead rod I that insulate therewith by insulation earth lead rod I is constituted; The C end of the middle electric conductor of described insulation earth lead rod I welds with buried earth electrode mutually; The other end is processed and is had externally threaded plush copper; Middle electric conductor one end of described insulation earth lead rod II is designed to have the concave structure of internal thread; And is connected with the external screw thread of the indirect electric conductor of insulation earth lead rod I, the S end of described insulation ground conductive bar II is taken over transformer neutral point and is connected.
The device of the reduction neutral ground utmost point step voltage of the utility model take its measure be with go into behind the ground ground connection down the lead-in wire bare wire change the insulated conductor rod into and be connected with earth electrode, make near the surface potential and the buried underground earth electrode current potential effective isolation of earth connection and open the long distance of L.Move to deep under ground to the most dangerous zone of earthed voltage in the radius 0.8m scope around the earth connection.From Fig. 1 earthed voltage scatter chart, can find out; The most precipitous area segments of curve is by peak clipping; Making the earthed voltage distribution curve become mild---G-bar descends; Eliminated the deathtrap of radius 0.8m around the earth connection, the equilibrium degree that lets earthed voltage distribute is improved, and the voltage distributed area extends to around the earth electrode outside the radius 20m.Around the neutral ground line in the radius 0.8m scope; The curvilinear motion rate of earthed voltage is being not maximum; (slope is zero but approach the straight line of one section level; The earthed voltage gradient is zero), as shown in Figure 1, so just change the deathtrap of step voltage into step voltage safety zone (being about equal potential difference).
The beneficial effect of the utility model is: can extend the earth connection that is applied to various lightning arresters, when the lightning arrester course of work, reduce earth electrode step voltage on every side, make its injury to people and animals reduce to minimum level.Through using insulation earth lead rod; Idealized the earthed voltage regularity of distribution; The interior maximum zone of earthed voltage rate of change of radius 0.8m scope is able to comparatively ideal inhibition around making earth connection; Let earthed voltage balanced the extending to around the earth connection outside the radius 20m that distribute, reduced step voltage that conventional neutral point manufacture method produced risk of injury people and animals.
Description of drawings
Fig. 1 is the earthed voltage distribution schematic diagram.
Fig. 2 is the structural representation of the utility model.
Fig. 3 is the sketch map that the insulation earth lead rod of the utility model adopts combining structure.
Embodiment
Embodiment below in conjunction with description of drawings the utility model.
Like Fig. 1, shown in Figure 2; The device of the reduction neutral ground utmost point step voltage of the utility model; It is characterized in that between buried grounding electrode 1 and transformer neutral point catcher 3, being provided with insulation earth lead rod 2; Described insulation earth lead rod 2 is made up of middle electric conductor 2-1 and the insulating outer layer 2-2 that surrounds this middle electric conductor 2-1; The C end of the middle electric conductor 2-1 of described insulation earth lead rod is connected with buried grounding electrode 1; The S end of the middle electric conductor 2-1 of described insulation earth lead rod is connected with transformer neutral point catcher 3, and described insulation earth lead rod 2 vertical buried degree of depth L are more than or equal to steplength 0.8m.Ug among Fig. 1 is an earth electrode branch voltage; UgI is the arbitrfary point step voltage, and Ugn is the infinity earthed voltage, and Ugm is maximum ground connection step voltage; L is the earth electrode depth of burying; Curve a is for connecing the pole tension distribution curve, and b is part voltage distribution curve for bare wire the time, and c is part voltage distribution curve when insulating earth rod.
As can be seen from Figure 1 since adopted above-mentioned measure be with go into behind the ground ground connection down the lead-in wire bare wire change the insulated conductor rod into and be connected with earth electrode, make near the face of land voltage and the buried underground earth electrode current potential effective isolation of earth connection and open L length distance.Move to deep under ground to the most dangerous zone of earthed voltage in the radius 0.8m scope around the earth connection.The step voltage near-linear is evenly distributed in around the earth electrode, and the earthed voltage distributed area extends to around the earth electrode beyond the radius 20m, has reduced the harm of face of land step voltage to people and animals significantly.
As shown in Figure 3; The sub-assembly that the insulation earth lead rod II that the described insulation earth lead rod 2 of the utility model is connected with the earth lead rod I that insulate therewith by insulation earth lead rod I is constituted; The C end of the middle electric conductor 2-1 of described insulation earth lead rod I welds with buried earth electrode 1 mutually; The other end is processed and is had externally threaded plush copper 2-3; Middle electric conductor 2-1 one end of described insulation earth lead rod II is designed to have the concave structure 2-4 of internal thread, and is connected with the external screw thread of the indirect electric conductor of insulation earth lead rod I, and the S of described insulation ground conductive bar II holds and transformer neutral point is taken over 3 and is connected.The sub-assembly that the utility model insulation earth lead rod II is constituted also can adopt alternate manner to connect.
The main strain insulator intensity restriction of considering outer insulating material of this composite type insulation of the utility model earth lead rod; Can process the insulation earth lead rod of different length as required; The insulation earth lead rod of this fabricated structure not only is convenient to connect, and guarantees that transportation avoids insulation harm.
The utility model has been owing to adopted insulation earth lead rod, it vertically imbedded underground 0.8m can make around the earth connection closely that the current density on the face of land reduces significantly, and extend to around the earth electrode outside the radius 20m.The insulation earth lead rod of said structure has reduced the current density of shallow surface effectively, thereby has reduced the step voltage on the face of land.
Middle electric conductor according to the described insulation earth lead rod of the utility model is selected the zinc-plated reinforcing bar of 14mm～18mm for use.
Described external insulation layer is silicon rubber or epoxy resin material; And adopt pouring technology and reinforcing bar conductor element to water admittedly to be integral; Thereby played protection metallic conductor protect it from corrosion; And, kept earthing device in shape for a long time at medium-term and long-term embedding waterproof, the non-corrosive that can not wear out of soil.
Embodiment 1
The utility model is applied in the hilly country, mine; And the sub-assembly of the described insulation earth lead rod of the utility model is made up of the long insulation earth lead rod II of 2m that the long insulation earth lead rod I of 2.5m is connected with the earth lead rod I that insulate therewith, and the C end of described insulation earth lead rod sub-assembly is imbedded underground degree of depth 0.8m.So just can be underground the profound plant of the ground connection that has high potential, the current density that accumulates in the earth connection peripheral ground is reduced significantly; The step voltage near-linear is evenly distributed in around the earth connection; The earthed voltage distributed area extends to earth electrode on every side beyond the radius 20m; Reduced face of land step voltage; The test resistance of its earth electrode is not less than 4 ohm of conventional requirements, thereby has effectively solved the difficult problem that mountain and hill area ground connection resistance can not meet the demands.Realized not increasing grounding electrode size, floor space, saved again under the prerequisite of construction funds, effectively guaranteed the fail safe that hilly country, mine step voltage escapes injury to people and animals.
Claims (5)
1. device that reduces neutral ground utmost point step voltage; It is characterized in that between buried grounding electrode and transformer neutral point catcher, being provided with insulation earth lead rod; Described insulation earth lead rod is made up of middle electric conductor and the insulating outer layer of surrounding this middle electric conductor; The C end of the middle electric conductor of described insulation earth lead rod is connected with buried grounding electrode; The S end of the middle electric conductor of described insulation earth lead rod is connected with the transformer neutral point catcher, and the vertical buried degree of depth of described insulation earth lead rod is more than or equal to steplength 0.8m.
2. the device of reduction neutral ground utmost point step voltage according to claim 1; It is characterized in that the sub-assembly that the excellent II of insulation earth lead that described insulation earth lead rod is connected with the earth lead rod I that insulate therewith by insulation earth lead rod I is constituted; The C end of the middle electric conductor of described insulation earth lead rod I welds with buried earth electrode mutually; The other end is processed the external screw thread that has plush copper; Middle electric conductor one end of described insulation earth lead rod II is designed to concave structure; And have internal thread within it, and is connected with the external screw thread of the indirect electric conductor of insulation earth lead rod I, the S end of described insulation ground conductive bar II is taken over transformer neutral point and is connected.
3. the device of reduction neutral ground utmost point step voltage according to claim 2; The sub-assembly of described insulation earth lead rod is made up of the long insulation earth lead rod II of 2m that the long insulation earth lead rod I of 2.5m is connected with the earth lead rod I that insulate therewith, and the C end of described insulation earth lead rod sub-assembly is imbedded underground degree of depth 0.8m.
4. the device of reduction neutral ground utmost point step voltage according to claim 1 is characterized in that the electric conductor (lead) of the centre of described insulation earth connection is selected the zinc-plated reinforcing bar of 14mm～18mm for use.
5. the device of reduction neutral ground utmost point step voltage according to claim 1 is characterized in that described external insulation layer material is silicon rubber or epoxide resin material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203565015U CN202260146U (en) | 2011-09-22 | 2011-09-22 | Neutral point grounding electrode step voltage reducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203565015U CN202260146U (en) | 2011-09-22 | 2011-09-22 | Neutral point grounding electrode step voltage reducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202260146U true CN202260146U (en) | 2012-05-30 |
Family
ID=46121332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203565015U Withdrawn - After Issue CN202260146U (en) | 2011-09-22 | 2011-09-22 | Neutral point grounding electrode step voltage reducing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202260146U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324716A (en) * | 2011-09-22 | 2012-01-18 | 鞍钢集团矿业公司 | Device for reducing step voltage of neutral point grounding electrode |
-
2011
- 2011-09-22 CN CN2011203565015U patent/CN202260146U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324716A (en) * | 2011-09-22 | 2012-01-18 | 鞍钢集团矿业公司 | Device for reducing step voltage of neutral point grounding electrode |
| CN102324716B (en) * | 2011-09-22 | 2013-08-07 | 鞍钢集团矿业公司 | Device for reducing step voltage of neutral point grounding electrode |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120530 Effective date of abandoning: 20130807 |
|
| RGAV | Abandon patent right to avoid regrant |