CN101237127A - Method for eliminating neutral grounding line parallel bug in transmission and distribution system - Google Patents
Method for eliminating neutral grounding line parallel bug in transmission and distribution system Download PDFInfo
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- CN101237127A CN101237127A CNA200710002964XA CN200710002964A CN101237127A CN 101237127 A CN101237127 A CN 101237127A CN A200710002964X A CNA200710002964X A CN A200710002964XA CN 200710002964 A CN200710002964 A CN 200710002964A CN 101237127 A CN101237127 A CN 101237127A
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Abstract
The invention relates to the electrical power transmission line, and discloses a method for eliminating the defect of the parallel connection of the neutral earth line in a transmission and distribution system. The method comprises the following steps that: 1) whether neutral earth lines of a plurality of electric installations and the neutral earth line of an arrester are connected in parallel in detected; 2) if yes, the earth lines connected in parallel are changed into a single ray type earth line, the neutral earth line of the transmission and distribution system and that of the arrester are buried separately, a led-down junctor of the arrester adopts the conducting wire with an insulating coating not less than 25 millimeters <2>, the distance between the two wires is not less than 0.4 meters, the neutral earth lines of a generator transformer and a main transformer arrester are to be kept more than 5 meters; 3) iron wires and iron parts lapped on the earth lines in the construction are eliminated; 4) the change in the earth resistance of the modified earth line is detected periodically. The method has simple operation and can solve the problem of the parallel connection of electric neutral earth lines in the transmission and distribution system.
Description
Technical field
The present invention relates to the defeated modified line road of electric power, be specifically related to a kind of method of eliminating neutral ground line parallel defective in the electrical power trans mission/distribution system.
Background technology
All there are the neutral ground line of the lightning arrester of distribution transforming, main transformer and distribution transforming and main transformer in distribution of various countries, the world today and China and transmission of electricity and connect the significant deficiency that an earth connection discharges over the ground.The neutral ground line of each electric equipments of power plant, transformer station all is earth connection in parallel, is to cause one of the main reasons great, especially big power outage.Because transformer station, the main transformer in power plant, main electric equipment, before the operation and back in service all has every year regularly does withstand voltage test and Insulation Test.Therefore, especially big power outage having taken place, can not be attributed to the electric of ageing equipment, producer and be equipped with quality, or the problem of main transformer overload operation.
China Report on May 28th, 2005, the Moscow large-area power-cuts be to begin to be short-circuited by distribution, cause the main transformer explosive combustion, the expert of other country can only say the aging and overload operation of main transformer.14 Japan-US having added since the especially big power failure of August in 2003, various countries have a power failure on a large scale, all be because the neutral ground line parallel, gap on the overhead ground wire or the gap on the earth connection, gap three big defectives in the porcelain vase string and cause serious accident, particularly distribution transformer neutral ground line parallel can arrive with eyes in direct viewing, and the neutral ground line parallel of the neutral ground of lightning arrester and transformer connects.For these years, the expert of countries in the world does not see the defective that this is serious, after accident takes place, impaired lightning arrester, transformer is changed, continue to use earth connection in parallel, and still continue to use the method for this neutral ground line parallel significant deficiency in the construction so far, this is observable significant deficiency.Neutral ground line parallel in power plant, the transformer station is just seen with eyes and cannot see at all.Especially big power outage has taken place, and the existence that does not have method to go to detect it is the main cause of large-area power-cuts, continues to use the neutral ground line parallel, also can only change with high insulator arrangement to be damaged and exchange device more in a large number.And in the electric equipment of height insulation, earth connection in parallel is arranged, and serious accident all will take place and continue to take place, have only the ground wire testing method of using, could check out the power plant, there is the defective of neutral ground parallel connection in transformer station.
Lightning arrester neutral ground line and transformer neutral ground line parallel, the discharge arrester self that thunders damages, and discharge all will be impacted master, pair coil of main transformer and distribution transforming over the ground.Because three-phase electricity potential difference, the discharge of arrester ground line will be impacted master, pair coil of master, distribution transforming depressor, serious accidents such as blast, burning will be short-circuited.It can impact one and next transformer station and cause large-area power-cuts, and part is electric simultaneously also can be damaged.
Summary of the invention
(1) technical problem that will solve
The purpose of this invention is to provide a kind of simple to operately, can solve neutral ground line electric in the electrical power trans mission/distribution system and connect the method for neutral ground line parallel defective in the elimination electrical power trans mission/distribution system of problem.
(2) technical scheme
In order to achieve the above object, the present invention takes following scheme:
The method of neutral ground line parallel defective in the elimination electrical power trans mission/distribution system of the present invention has following steps:
Whether 1) must be that 200510068396.4 ground wire testing method detects the neutral ground line of the neutral ground line of some electric equipments in the electrical power trans mission/distribution system and lightning arrester with the patent No. in parallel;
2) if the neutral ground line parallel of described step 1), then the earth connection of parallel connection is transformed into the earth connection of single ray type, distribution transformer neutral ground line and lightning arrester neutral ground line will divide excavation to bury earth connection, the drawing second line of a couplet wiring and should adopt and be not less than 25mm of lightning arrester
2The lead that has insulating coating (because the stand of distribution transformer is an iron, the shell of distribution transformer is neutral ground entirely), the distance between two lines should be not less than 0.4m, the neutral ground line of main transformer and main transformer lightning arrester must remain on more than the 5m; Dig the wire spacing that buries other electric equipment earth connections in the ground connection ditch for unification and be not less than 0.4m.
3) remove iron wire, the ironware that rides in the construction on the earth connection;
4) regularly detect the variation of the earth resistance of improved earth connection.
Wherein, the electric equipment of described step 1) comprises that main transformer, distribution transformer, instrument transformer, capacitor etc. have the equipment of neutral ground line.
Wherein, the lead-in wire of described step 1) lightning arrester is not less than 25mm
2Insulated wire draws ground connection down.
Wherein, comprise that also the user passes in and out the step that the line place is provided with low voltage surge arrester and neutral ground line ground wire respectively.
(3) beneficial effect
1, owing to adopt above scheme, the present invention is simple to operate, can solve neutral ground line electric in the electrical power trans mission/distribution system and connect defective; 2, owing to be to transform in existing electrical power trans mission/distribution system, therefore, it is low to have a cost, and can be applicable to the various electric neutral ground line transformation in the electrical power trans mission/distribution system; 3, by neutral ground line electric in the method transformation electrical power trans mission/distribution system of the present invention and after connecing problem, can guarantee that electric equipment can not destroy by earth connection mutually because of heavy current in the electrical power trans mission/distribution system.
Description of drawings
Fig. 1 is the schematic diagram before electric neutral ground line is transformed in the electrical power trans mission/distribution system;
Fig. 2 is that the present invention is used for the improved schematic diagram of the electric neutral ground line of electrical power trans mission/distribution system.
Among the figure, 1 ', transformer; 2 ', lightning arrester; 3 ', the shared neutral ground line of transformer and lightning arrester; 1, transformer; 2, lightning arrester; 3, the single ray type of transformer neutral ground line; 4, the single ray type of lightning arrester neutral ground line.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
A kind of method of eliminating neutral ground line parallel defective in the electrical power trans mission/distribution system of the present invention has following concrete steps:
Referring to Fig. 1, Fig. 2.Must be that 200510068396.4 ground wire testing method detects power plant, transformer station, distribution transformer and main transformer and various neutral ground line with the patent No. at first, whether the earth connection that detects the high and low pressure electric equipment be (see figure 1) in parallel; Earth connection in parallel is transformed into the earth connection 3,4 of single ray type; And notice that single ray type earth connection spacing distance is: the neutral ground line of main transformer and main transformer lightning arrester must remain on more than the 5m; Distance between the neutral ground line of distribution transformer and lightning arrester should be not less than 0.4m; Dig the wire spacing that buries other electric equipment earth connections in the ground connection ditch for unification and be not less than 0.4m.Improved earth connection guarantees not have iron wire, ironware to ride on the preceding earth connection of construction transformation, causes parallel connection.
The neutral ground line of distribution transformer and lightning arrester is separated ground connection, and the lead-in wire of lightning arrester will be with being not less than 25mm
2Insulated wire draws ground connection down; The high-low pressure lightning arrester of indoor and outdoor all will separate earth connection with the ground connection of instrument transformer electric capacity ammeter; The low pressure neutral ground line of outlet adds and buries, the auxiliary earth line, the user passes in and out line, mountain area particularly, the user of open country, ore deposit passes in and out the line place low voltage surge arrester and neutral ground line ground wire is installed respectively, cause thunder and lightning damage to be controlled on the electric equipment, and avoid this harm to transformer station and the diffusion of transfer transformer station to electric equipment; In case accident all will at first detect earth connection after taking place.
Whether in parallel about the neutral ground line of the neutral ground line that detects some electric equipments in the electrical power trans mission/distribution system and lightning arrester method, can adopt number of patent application is 200510068396.4 " method for detecting ground wire of power transmission and distribution system ".
Claims (4)
1. method of eliminating neutral ground line parallel defective in the electrical power trans mission/distribution system is characterized in that following steps are arranged:
1) whether the neutral ground line of the neutral ground line of some electric equipments and lightning arrester is in parallel in the detection electrical power trans mission/distribution system;
2) if the neutral ground line parallel of described step 1), then the earth connection of parallel connection is transformed into the earth connection of single ray type, distribution transformer neutral ground line and lightning arrester neutral ground line will divide excavation to bury earth connection, the drawing second line of a couplet wiring and should adopt and be not less than 25mm of lightning arrester
2The lead that has insulating coating, the distance between two lines should be not less than 0.4m, the neutral ground line of main transformer and main transformer lightning arrester must remain on more than the 5m;
3) remove iron wire, the ironware that rides in the construction on the earth connection;
4) regularly detect the variation of the earth resistance of improved earth connection.
2. a kind of method of eliminating neutral ground line parallel defective in the electrical power trans mission/distribution system as claimed in claim 1, it is characterized in that: the electric equipment of described step 1) comprises main transformer, distribution transformer, instrument transformer etc.
3. a kind of method of eliminating neutral ground line parallel defective in the electrical power trans mission/distribution system as claimed in claim 1, it is characterized in that: the lead-in wire of described step 1) lightning arrester is not less than 25mm
2Insulated wire draws ground connection down.
4. a kind of method of eliminating neutral ground line parallel defective in the electrical power trans mission/distribution system as claimed in claim 1 is characterized in that: comprise that also the user passes in and out the step that the line place is provided with low voltage surge arrester and neutral ground line ground wire respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710002964XA CN101237127B (en) | 2007-01-30 | 2007-01-30 | Method for eliminating neutral grounding line parallel bug in transmission and distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710002964XA CN101237127B (en) | 2007-01-30 | 2007-01-30 | Method for eliminating neutral grounding line parallel bug in transmission and distribution system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101237127A true CN101237127A (en) | 2008-08-06 |
| CN101237127B CN101237127B (en) | 2011-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710002964XA Expired - Fee Related CN101237127B (en) | 2007-01-30 | 2007-01-30 | Method for eliminating neutral grounding line parallel bug in transmission and distribution system |
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| Country | Link |
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| CN (1) | CN101237127B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377649A (en) * | 2014-11-14 | 2015-02-25 | 云南电力调度控制中心 | Automatic switching method of transformer neutral grounding knife-switch |
| CN110265800A (en) * | 2019-05-21 | 2019-09-20 | 中国建筑第八工程局有限公司 | Based on the earthing or grounding means and its construction method under the conditions of plate brad supporting |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033675C (en) * | 1992-12-05 | 1996-12-25 | 徐毅军 | protection method for preventing thunder to distribution transformer |
| CN1077734C (en) * | 1996-08-16 | 2002-01-09 | 徐毅军 | New lightning-protection method for distribution transformer and low-voltage power network |
-
2007
- 2007-01-30 CN CN200710002964XA patent/CN101237127B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377649A (en) * | 2014-11-14 | 2015-02-25 | 云南电力调度控制中心 | Automatic switching method of transformer neutral grounding knife-switch |
| CN104377649B (en) * | 2014-11-14 | 2017-06-13 | 云南电力调度控制中心 | Transformer neutral point grounding switch automatic switching method |
| CN110265800A (en) * | 2019-05-21 | 2019-09-20 | 中国建筑第八工程局有限公司 | Based on the earthing or grounding means and its construction method under the conditions of plate brad supporting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101237127B (en) | 2011-07-20 |
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