CN103414147A - Method for reducing direct current grounding times in power grid - Google Patents
Method for reducing direct current grounding times in power grid Download PDFInfo
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- CN103414147A CN103414147A CN201310388520XA CN201310388520A CN103414147A CN 103414147 A CN103414147 A CN 103414147A CN 201310388520X A CN201310388520X A CN 201310388520XA CN 201310388520 A CN201310388520 A CN 201310388520A CN 103414147 A CN103414147 A CN 103414147A
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- direct current
- pipe
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- earthing
- cable
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Abstract
A method for reducing current direct grounding times in a power grid comprises the following steps: analyzing essential factors, and analysis showing that direct current grounding is mainly because direct current grounding is high in signal sending sensitivity and can not escape interference at direct current circuit insulation descending time; using fireproof blocking materials to block a terminal box, a mechanism box, a CT, a disconnecting link cable pipe orifice in a standard mode, wherein the fireproof blocking materials comprise chlorinated paraffin and China clay powder; improving the cable joint pipe orifice, and changing the cable joint pipe orifice into a pipe orifice of a U-shaped groove structure, wherein the height of the U-shaped groove is 35-45mm, and the width of the U-shaped groove is 35-45mm. The method reduces direct current grounding times and ensures normal and stable operation of a direct current system.
Description
Technical field:
The present invention relates to the electric network reconstruction field, particularly a kind of method that reduces DC earthing number of times in electrical network.
Background technology:
In electric power system, during the transformer station long-play, to constantly transform equipment, many reasons causes the insulation of part secondary device to reduce, when suffering thunderstorm weather, the instantaneous reduction of some insulation often occurs, the phenomenon of ground connection even, this forms resistance to carrying out unattended operation work, DC earthing is in the process of searching, consider in case of necessity to exit relevant protection, some have been increased dangerous, the factor of irregular operation, therefore, for improving the safe operation of direct current system equipment, reduce the number of times of DC system grounding, prevent unit exception, the generation of accident, seem very important.
Direct current system as the operation of transformer station, protection, automatically, the core energy such as signal and emergency lighting, be the important component part of transformer station.Reduce DC system grounding, guarantee that the normal stable operation of direct current system is the needs of system safety stable operation.2 ground connection occur direct current system may cause the protection malfunction, and circuit breaker mistrip, tripping or DC insurance fusing, make operation and protection lose power supply, expansion accident scope.Direct-flow ground signalling, make the operations staff easily produce paralysis psychology frequently, and the unattended operation work of carrying out transformer station is formed to resistance.
Summary of the invention:
In view of this, be necessary to provide a kind of method that reduces DC earthing number of times in electrical network.
A kind of method that reduces DC earthing number of times in electrical network comprises the following steps:
Essential factor is analyzed, in electrical network, the direct current system number of times of posting a letter is 8 to 29 times, the ground connection number of times is 3 to 4 times, and DC system grounding point is that 35kV2PT isolating switch auxiliary contact loop, 2PT113/101,110kV1113 control electric power loop, 110kV1100 switch closing circuit, 1Y182/2,110kV1112 the third isolating switch 2Y185/801,1114 first 1 isolating switch 2Y188/801 auxiliary contact loops;
The analysis showed that DC earthing is mainly because DC earthing is posted a letter highly sensitively, can not escape the DC loop insulation interference while descending;
Terminal box, mechanism case, CT, the disconnecting link cable mouth of pipe are adopted to the fire-proof sealing material shutoff that standardizes;
The cable connection mouth of pipe is improved, the cable connection mouth of pipe is changed into to the mouth of pipe of U-shaped groove structure, make the cable at wiring mouth of pipe place and the wiring mouth of pipe leave distance, the height of U-shaped groove is 35 to 45mm, and wide is 35 to 45mm.
Fire-proof sealing material comprises chlorinated paraffin wax, china clay in powder.
Adopt the present invention, reduced the DC earthing number of times, guaranteed the normal stable operation of direct current system.
Embodiment:
Reduce the method for DC earthing number of times in electrical network, comprise the following steps:
Essential factor is analyzed, in electrical network, the direct current system number of times of posting a letter is 8 to 29 times, the ground connection number of times is 3 to 4 times, and DC system grounding point is that 35kV2PT isolating switch auxiliary contact loop, 2PT113/101,110kV1113 control electric power loop, 110kV1100 switch closing circuit, 1Y182/2,110kV1112 the third isolating switch 2Y185/801,1114 first 1 isolating switch 2Y188/801 auxiliary contact loops;
The analysis showed that DC earthing is mainly because DC earthing is posted a letter highly sensitively, can not escape the DC loop insulation interference while descending;
Terminal box, mechanism case, CT, the disconnecting link cable mouth of pipe are adopted to the fire-proof sealing material shutoff that standardizes, and fire-proof sealing material comprises chlorinated paraffin wax, china clay in powder;
The improved new technology secondary cable wiring mouth of pipe is improved, by gapless, change the cable wiring mouth of pipe and cable into U-shaped groove interface, the height of U-shaped groove is 35 to 45mm, and wide is 35 to 45mm.
Cable is during shutoff, through operating personnel's test, and 24 branch roads, DC earthing easily occurs in 4 branch roads, and while posting a letter, positive and negative resistance is 3.38 kilo-ohms to 142.6 kilo-ohms, mostly occurs overcast and rainy, causes that the part secondary insulating reduces.
Transformation due to the secondary cable new technology, do not consider that ground is subjected to the impact of expansion factor in season, cause secondary cable destroyed in the insulation of mouth of pipe place, change the interface between the cable wiring mouth of pipe and cable into U-shaped groove interface, avoided, because being subjected to seasonal effect that cable is expanded, causing the breakage of cable insulated hull.
Adopt the present invention, reduced the DC earthing number of times, guaranteed the normal stable operation of direct current system.
Claims (2)
1. method that reduces DC earthing number of times in electrical network comprises the following steps:
Essential factor is analyzed, in electrical network, the direct current system number of times of posting a letter is 8 to 29 times, the ground connection number of times is 3 to 4 times, and DC system grounding point is that 35kV2PT isolating switch auxiliary contact loop, 2PT113/101,110kV1113 control electric power loop, 110kV1100 switch closing circuit, 1Y182/2,110kV1112 the third isolating switch 2Y185/801,1114 first 1 isolating switch 2Y188/801 auxiliary contact loops;
The analysis showed that DC earthing is mainly because DC earthing is posted a letter highly sensitively, can not escape the DC loop insulation interference while descending;
Terminal box, mechanism case, CT, the disconnecting link cable mouth of pipe are adopted to the fire-proof sealing material shutoff that standardizes;
The cable connection mouth of pipe is improved, the cable connection mouth of pipe is changed into to the mouth of pipe of U-shaped groove structure, make the cable at wiring mouth of pipe place and the wiring mouth of pipe leave distance, the height of U-shaped groove is 35 to 45mm, and wide is 35 to 45mm.
2. the method for DC earthing number of times in reduction electrical network as claimed in claim 1, it is characterized in that: fire-proof sealing material comprises chlorinated paraffin wax, china clay in powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310388520.XA CN103414147B (en) | 2013-08-30 | 2013-08-30 | Reduce the method for DC earthing number of times in electrical network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310388520.XA CN103414147B (en) | 2013-08-30 | 2013-08-30 | Reduce the method for DC earthing number of times in electrical network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103414147A true CN103414147A (en) | 2013-11-27 |
| CN103414147B CN103414147B (en) | 2016-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310388520.XA Expired - Fee Related CN103414147B (en) | 2013-08-30 | 2013-08-30 | Reduce the method for DC earthing number of times in electrical network |
Country Status (1)
| Country | Link |
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| CN (1) | CN103414147B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH640372A5 (en) * | 1981-01-09 | 1983-12-30 | Beck Rene Sa | Cable chamber |
| DE20319567U1 (en) * | 2003-12-17 | 2004-03-11 | Virant, Robert | Connector for connecting cables to a substrate, especially a circuit board, has cable outlet grooves with a groove base aligned with a cable inlet bore and having a curved base section which follows a specified bending radius |
| CN1555469A (en) * | 2001-09-21 | 2004-12-15 | ���ʹɷ�����˾ | Seal for a cable entry, pipe penetration or the like |
| CN201332241Y (en) * | 2009-01-10 | 2009-10-21 | 贡奎生 | Threading sheath for cable tube |
| CN201639253U (en) * | 2009-12-10 | 2010-11-17 | 余宾来 | Primary cable cavern plugging device for transformer substation |
| CN202474788U (en) * | 2012-03-27 | 2012-10-03 | 齐齐哈尔电业局 | Cable pipe orifice sealing device |
-
2013
- 2013-08-30 CN CN201310388520.XA patent/CN103414147B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH640372A5 (en) * | 1981-01-09 | 1983-12-30 | Beck Rene Sa | Cable chamber |
| CN1555469A (en) * | 2001-09-21 | 2004-12-15 | ���ʹɷ�����˾ | Seal for a cable entry, pipe penetration or the like |
| DE20319567U1 (en) * | 2003-12-17 | 2004-03-11 | Virant, Robert | Connector for connecting cables to a substrate, especially a circuit board, has cable outlet grooves with a groove base aligned with a cable inlet bore and having a curved base section which follows a specified bending radius |
| CN201332241Y (en) * | 2009-01-10 | 2009-10-21 | 贡奎生 | Threading sheath for cable tube |
| CN201639253U (en) * | 2009-12-10 | 2010-11-17 | 余宾来 | Primary cable cavern plugging device for transformer substation |
| CN202474788U (en) * | 2012-03-27 | 2012-10-03 | 齐齐哈尔电业局 | Cable pipe orifice sealing device |
Non-Patent Citations (1)
| Title |
|---|
| 王永强: "直流系统接地故障查找方法探讨及防范接地措施", 《应用科技》, 30 September 2010 (2010-09-30), pages 245 - 246 * |
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| CN103414147B (en) | 2016-03-30 |
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Granted publication date: 20160330 Termination date: 20160830 |