CN104104030A - Hot-line work recovery method of ground wire of high-voltage cable shielding layer since stealing - Google Patents
Hot-line work recovery method of ground wire of high-voltage cable shielding layer since stealing Download PDFInfo
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- CN104104030A CN104104030A CN201410370967.9A CN201410370967A CN104104030A CN 104104030 A CN104104030 A CN 104104030A CN 201410370967 A CN201410370967 A CN 201410370967A CN 104104030 A CN104104030 A CN 104104030A
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- ground wire
- earth connection
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- auxiliary switch
- voltage cable
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Abstract
The invention provides a hot-line work recovery method of a ground wire of a high-voltage cable shielding layer since stealing. The method comprises the following steps: connecting one end of the ground wire to be connected with a right breaking point of the original ground wire, and completely repairing; connecting one end of an auxiliary ground wire with any point in the middle of the ground wire to be connected; turning off an auxiliary switch; connecting the other end of the assistant ground wire with any point at the left side of a left breaking point of the original ground wire; turning on the auxiliary switch; connecting the other end of the ground wire to be connected with the left breaking point of the original ground wire, and repairing completely; turning off the auxiliary switch; dismounting the auxiliary ground wire. According to the method, the auxiliary switch is matched with the auxiliary ground wire to dredge induced current that flows through the ground wire, and the risk of induced voltage to the safety of workers in hot-line work is also removed at the same time; the ground wire can be recovered under hot-line condition, thus the economic loss caused by power off of a high-voltage cable is avoided, and the safe and stable running of a power grid is ensured; the method is simple to operate, safe and reliable, practicable, and high in popularization and application value.
Description
Technical field
The present invention relates to high-tension cable maintenance technology field, be specially the stolen rear live line working restoration methods of a kind of high-voltage cable shielding layers earth connection.
Background technology
Because high-tension cable adopts single cored structure, according to electromagnetism principle, on its metal screen layer, will inevitably there is induced voltage, the main method of cable shielding layer earthing that adopts suppresses induced voltage at present.Common earthing mode mainly contains: single-end earthed, two sides earth and cross interconnected ground connection.While adopting two sides earth and cross interconnected ground connection, cable shield has earth current to flow through.During long-time running, often there is the stolen situation of earth connection of screen in cable.Owing to having induced voltage and earth current on earth connection, for safety, often can high-tension cable is out of service, then recover earth connection.Both time-consuming inconvenience of operation like this, causes again economic loss, and affects power network safety operation.
description
For the problems referred to above, the object of the present invention is to provide the stolen rear live line working restoration methods of a kind of safe and reliable high-voltage cable shielding layers earth connection, technical scheme is as follows:
The stolen rear live line working restoration methods of high-voltage cable shielding layers earth connection, after high-voltage cable shielding layers earth connection is stolen, forms a left breakpoint and a right breakpoint on original earth connection; Live line working recovering step is as follows:
Step 1: earth connection to be accessed is wherein connected with the right breakpoint of original earth connection one end, and repairs complete;
Step 2: one end of auxiliary grounding wire is connected with any point in the middle of earth connection to be accessed; Then disconnect auxiliary switch, then the other end of auxiliary grounding wire is connected with any point on the left breakpoint of the original earth connection left side;
Step 3: closed auxiliary switch; Again the other end of earth connection to be accessed is connected with the left breakpoint of original earth connection, and repairs complete;
Step 4: disconnect auxiliary switch, remove auxiliary grounding wire.
Further, sectional area>=25 mm of auxiliary grounding wire
2; Specified drop-out current>=the 100A of auxiliary switch.
The invention has the beneficial effects as follows: the present invention utilizes auxiliary switch to coordinate auxiliary grounding wire, dredges the induced current flowing through in earth connection, eliminates the security threat of induced voltage to live line working personnel simultaneously; Can realize after high-voltage cable shielding layers earth connection is stolen, live line working recovers, and the economic loss of having avoided high-tension cable to have a power failure and bring, has ensured power network safety operation.The present invention is simple to operate, safe and reliable, practical, has very strong application value.
Accompanying drawing explanation
Fig. 1 is the stolen rear live line working restoration methods schematic diagram of a kind of high-voltage cable shielding layers earth connection.
In figure: the left breakpoint of 1-; The right breakpoint of 2-; 3-earth connection to be accessed; 4-auxiliary grounding wire; The original earth connection of 5-.
Embodiment
By reference to the accompanying drawings, after high-voltage cable shielding layers earth connection is stolen, on original earth connection 5, form a left breakpoint 1 and a right breakpoint 2; Live line working recovering step is as follows:
Step 1: earth connection 3 to be accessed is wherein connected with the right breakpoint 2 of original earth connection 5 one end, and repairs complete;
Step 2: one end of auxiliary grounding wire 4 is connected with any point in the middle of earth connection 3 to be accessed; Then disconnect auxiliary switch K, then the other end of auxiliary grounding wire 4 is connected with any point on the left breakpoint of original earth connection 51 left side;
Step 3: closed auxiliary switch K; Again the other end of earth connection 3 to be accessed is connected with the left breakpoint 1 of original earth connection 5, and repairs complete;
Step 4: disconnect auxiliary switch K, remove auxiliary grounding wire 4.
With auxiliary switch K, coordinate auxiliary grounding wire 4, dredge the induced current flowing through in earth connection, can eliminate the security threat of induced voltage to live line working personnel simultaneously.Auxiliary grounding wire 4 sectional areas are not less than 25 mm
2, auxiliary grounding wire 4 sectional areas that the present embodiment is selected are 25 mm
2; The specified drop-out current of auxiliary switch K is not less than 100A, and the specified drop-out current of auxiliary switch K that the present embodiment is selected is 100A.
Carrying out before live line working is resumed work also should carrying out corresponding safeguard procedures: first, need to confirm the mode of power transmission cable shielding layer grounding, understand fully it is single-end earthed, two sides earth, or cross interconnected ground connection; Also need to confirm construction of cable size, comprise the internal-and external diameter of screen, operating load electric current, cable length, the distance between A, B, C threephase cable etc.; Then according to the structural parameters of cable and operational factor, try to achieve cable shielding layer earthing electric current; Use again the voltage at stolen section of two ends of voltage watchband electrical testing earth connection, confirm that whether induced voltage is in safe range; Finally, according to the size of induced voltage and earth current, take the safeguard procedures of live line working, select suitable insulating tool, for live line working, resume work and do more reliable safety guarantee.
Claims (2)
1. the stolen rear live line working restoration methods of high-voltage cable shielding layers earth connection, after described high-voltage cable shielding layers earth connection is stolen, forms a left breakpoint (1) and a right breakpoint (2) on original earth connection (5); It is characterized in that,
Step 1: earth connection to be accessed (3) is wherein connected with the right breakpoint (2) of original earth connection (5) one end, and repairs complete;
Step 2: one end of auxiliary grounding wire (4) is connected with any point in the middle of earth connection to be accessed (3); Then disconnect the auxiliary switch (K) on auxiliary grounding wire (4), then the other end of auxiliary grounding wire (4) is connected with any point on the left breakpoint of original earth connection (5) (1) left side;
Step 3: closed auxiliary switch (K); Again the other end of earth connection to be accessed (3) is connected with the left breakpoint (1) of original earth connection (5), and repairs complete;
Step 4: disconnect auxiliary switch (K), remove auxiliary grounding wire (4).
2. the stolen rear live line working restoration methods of a kind of high-voltage cable shielding layers earth connection according to claim 1, is characterized in that sectional area>=25 mm of described auxiliary grounding wire (4)
2; Specified drop-out current>=the 100A of described auxiliary switch (K).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410370967.9A CN104104030A (en) | 2014-07-30 | 2014-07-30 | Hot-line work recovery method of ground wire of high-voltage cable shielding layer since stealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410370967.9A CN104104030A (en) | 2014-07-30 | 2014-07-30 | Hot-line work recovery method of ground wire of high-voltage cable shielding layer since stealing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104104030A true CN104104030A (en) | 2014-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410370967.9A Pending CN104104030A (en) | 2014-07-30 | 2014-07-30 | Hot-line work recovery method of ground wire of high-voltage cable shielding layer since stealing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104104030A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794973A (en) * | 2010-04-07 | 2010-08-04 | 绵阳电业局 | Live working method for replacing distribution transformer |
| CN201601483U (en) * | 2009-12-15 | 2010-10-06 | 辽宁省电力有限公司鞍山供电公司 | 10kV line live troubleshooting bypass device |
| CN103532047A (en) * | 2013-10-16 | 2014-01-22 | 国家电网公司 | Operating method and device for replacing 10kV pole-mounted drop-out fuse |
| CN203734209U (en) * | 2014-02-17 | 2014-07-23 | 广东电网公司佛山供电局 | Live working device for cable bypass |
-
2014
- 2014-07-30 CN CN201410370967.9A patent/CN104104030A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201601483U (en) * | 2009-12-15 | 2010-10-06 | 辽宁省电力有限公司鞍山供电公司 | 10kV line live troubleshooting bypass device |
| CN101794973A (en) * | 2010-04-07 | 2010-08-04 | 绵阳电业局 | Live working method for replacing distribution transformer |
| CN103532047A (en) * | 2013-10-16 | 2014-01-22 | 国家电网公司 | Operating method and device for replacing 10kV pole-mounted drop-out fuse |
| CN203734209U (en) * | 2014-02-17 | 2014-07-23 | 广东电网公司佛山供电局 | Live working device for cable bypass |
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Application publication date: 20141015 |