CN103414147B - Reduce the method for DC earthing number of times in electrical network - Google Patents
Reduce the method for DC earthing number of times in electrical network Download PDFInfo
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- CN103414147B CN103414147B CN201310388520.XA CN201310388520A CN103414147B CN 103414147 B CN103414147 B CN 103414147B CN 201310388520 A CN201310388520 A CN 201310388520A CN 103414147 B CN103414147 B CN 103414147B
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- pipe
- mouth
- earthing
- cable
- electrical network
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000003566 sealing material Substances 0.000 claims abstract description 8
- 238000009413 insulation Methods 0.000 claims abstract description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000007246 mechanism Effects 0.000 claims abstract description 4
- 239000012188 paraffin wax Substances 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 238000000556 factor analysis Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
Reduce a method for DC earthing number of times in electrical network, comprise the following steps: essential factor analysis, analyze and show DC earthing mainly because DC earthing transmits highly sensitive, can not escape interference when DC loop insulation declines; Fire-proof sealing material is adopted to carry out standardization shutoff to terminal box, mechanism case, CT, the disconnecting link cable mouth of pipe; Fire-proof sealing material comprises chlorinated paraffin wax, china clay in powder; Improve the cable connection mouth of pipe, the cable connection mouth of pipe is changed into the mouth of pipe of U-type groove structure, the height of U-type groove is 35 to 45mm, and wide is 35 to 45mm.Adopt the present invention, reduce DC earthing number of times, ensure that the operation of direct current system normal table.
Description
Technical field:
The present invention relates to electric network reconstruction field, particularly a kind of method reducing DC earthing number of times in electrical network.
Background technology:
In electric power system, during transformer station's long-play, constantly to transform equipment, many reasons causes the insulation of part secondary device to reduce, when suffering thunderstorm weather, some instantaneous reductions of insulating of frequent generation, the even phenomenon of ground connection, this forms resistance to the work of implementation unattended operation, DC earthing is in the process of searching, consider if desired to exit relevant protection, add some 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, ensure that the operation of direct current system normal table is the needs of system safety stable operation.Direct current system generation two points ground fault may cause false protection, and circuit breaker mistrip, tripping or DC insurance fusing, make operation and protection lose power supply, expansion accident scope.Direct-flow ground signalling frequently, makes operations staff easily produce paralysis psychology, forms resistance to the unattended operation work carrying out transformer station.
Summary of the invention:
In view of this, be necessary to provide a kind of method reducing DC earthing number of times in electrical network.
Reduce a method for DC earthing number of times in electrical network, comprise the following steps:
Essential factor is analyzed, in electrical network, it is 8 to 29 times that direct current system transmits number of times, ground connection number of times is 3 to 4 times, DC system grounding point is 35kV2PT isolating switch auxiliary contact loop, 2PT113/101,110kV1113 control electric power loop, 110kV1100 switch closing circuit, 1Y182/2,110,kV1,112 third isolating switch 2Y185/801,1114 first 1 isolating switch 2Y188/801 auxiliary contact loops;
Analysis shows that DC earthing is because DC earthing transmits highly sensitive, can not escape interference when DC loop insulation declines;
Fire-proof sealing material is adopted to carry out standardization shutoff to the cable mouth of pipe of the cable mouth of pipe of terminal box, mechanism case, the cable mouth of pipe of CT, the cable mouth of pipe of disconnecting link;
Improve the cable connection mouth of pipe, the cable connection mouth of pipe is changed into the mouth of pipe of U-type groove structure, make the cable at wiring mouth of pipe place and the wiring mouth of pipe leave distance, the height of U-type 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, reduce DC earthing number of times, ensure that the operation of direct current system normal table.
Embodiment:
Reduce the method for DC earthing number of times in electrical network, comprise the following steps:
Essential factor is analyzed, in electrical network, it is 8 to 29 times that direct current system transmits number of times, ground connection number of times is 3 to 4 times, DC system grounding point is 35kV2PT isolating switch auxiliary contact loop, 2PT113/101,110kV1113 control electric power loop, 110kV1100 switch closing circuit, 1Y182/2,110,kV1,112 third isolating switch 2Y185/801,1114 first 1 isolating switch 2Y188/801 auxiliary contact loops;
Analysis shows DC earthing mainly because DC earthing transmits highly sensitive, can not escape interference when DC loop insulation declines;
Adopt fire-proof sealing material to carry out standardization shutoff to terminal box, mechanism case, CT, the disconnecting link cable mouth of pipe, fire-proof sealing material comprises chlorinated paraffin wax, china clay in powder;
Improve the improved new technology secondary cable wiring mouth of pipe, change the cable wiring mouth of pipe and cable into U-type groove interface by gapless, the height of U-type groove is 35 to 45mm, and wide is 35 to 45mm.
During the non-shutoff of cable, through operating personnel's test, 24 branch roads, easily there is DC earthing in 4 branch roads, when transmitting, positive and negative resistance is 3.38 kilo-ohms to 142.6 kilo-ohms, mostly occurs overcast and rainy, causes part secondary insulating to reduce.
Due to the transformation of secondary cable new technology, do not consider that ground is subject 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-type groove interface, avoiding because making cable expand by seasonal effect, causing the breakage of cable insulated hull.
Adopt the present invention, reduce DC earthing number of times, ensure that the operation of direct current system normal table.
Claims (2)
1. reduce a method for DC earthing number of times in electrical network, comprise the following steps:
Essential factor is analyzed, in electrical network, it is 8 to 29 times that direct current system transmits number of times, ground connection number of times is 3 to 4 times, DC system grounding point is 35kV2PT isolating switch auxiliary contact loop, 2PT113/101,110kV1113 control electric power loop, 110kV1100 switch closing circuit, 1Y182/2,110,kV1,112 third isolating switch 2Y185/801,1114 first 1 isolating switch 2Y188/801 auxiliary contact loops;
Analysis shows that DC earthing is because DC earthing transmits highly sensitive, can not escape interference when DC loop insulation declines;
Fire-proof sealing material is adopted to carry out standardization shutoff to the cable mouth of pipe of the cable mouth of pipe of terminal box, mechanism case, the cable mouth of pipe of CT, the mouth of pipe of disconnecting link cable;
Improve the cable connection mouth of pipe, the cable connection mouth of pipe is changed into the mouth of pipe of U-type groove structure, make the cable at wiring mouth of pipe place and the wiring mouth of pipe leave distance, the height of U-type groove is 35 to 45mm, and wide is 35 to 45mm.
2. the method reducing DC earthing number of times in electrical network as claimed in claim 1, 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 CN103414147A (en) | 2013-11-27 |
| CN103414147B true CN103414147B (en) | 2016-03-30 |
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| 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 |
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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 |
|---|
| 直流系统接地故障查找方法探讨及防范接地措施;王永强;《应用科技》;20100930;第245-246页 * |
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|---|---|
| CN103414147A (en) | 2013-11-27 |
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