CN213043436U - Circulation restraining system for 110kV single-core high-voltage cable - Google Patents
Circulation restraining system for 110kV single-core high-voltage cable Download PDFInfo
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- CN213043436U CN213043436U CN202020932503.3U CN202020932503U CN213043436U CN 213043436 U CN213043436 U CN 213043436U CN 202020932503 U CN202020932503 U CN 202020932503U CN 213043436 U CN213043436 U CN 213043436U
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Abstract
110kV single core high voltage cable circulation suppression system. The new valley energy line laying mode is that cable trench, direct burial, poling and pipe jacking are mixed laying, the protective layer adopts a mode of cross interconnection with one end direct and the other end grounded through an overvoltage protector, and after operation, the metal sheath grounding circulation is detected through circulation to be larger. The utility model discloses the constitution includes: sheath current restraines reactor (3), sheath current restrain reactor both ends parallelly connected have arrester (2), sheath current restrain reactor the arrester install in ground connection case (1) the inside to insert transmission system through connecting cable (4), transmission system including cable joint (5) of connecting high tension cable, cable joint be 110kV three-phase transmission line and connect, through stress cone (6), insulating (7) and aluminium sheath (8) with high tension cable section by section connection constitution power transmission passageway through stress cone, insulating and aluminium sheath. The utility model is used for 110kV single core high tension cable circulation restraint system.
Description
The technical field is as follows:
the utility model relates to a power transmission equipment field, concretely relates to 110kV single core high tension cable circulation restraint system.
Background art:
the new valley energy line is 110kV/800mm2XLPE aluminum sheath cable, the total length is 6740 m, 15 sections are divided, and the laying mode is cable trench, direct burial, pipe penetration and pipe jacking mixed laying. The protective layer is in a mode that one end of the protective layer is directly connected in a cross-connection mode, and the other end of the protective layer is grounded through the overvoltage protector, and after the protective layer is put into operation 10 months and 10 days in 2009, the metal sheath is found to have large grounding circulation through circulation detection. Through preliminary analysis, the main reasons for the larger circulation of the protective layer of the valley energy line are as follows: 1. the cable in the same cross interconnection section is not uniform in segmentation, the cable is directly buried without forming a 'pin' shape, so that the circulation current is large, 2, the induction voltage close to a loop is high, the circulation current loss can cause the metal protective layer to generate heat, the current carrying capacity of the cable is reduced, and if the grounding wire is not welded well, local overheating can be caused, so that the cable is broken down. The ground fault current generates induced voltage on the cable sheath, the induced voltage cannot be offset through cross interconnection, the voltage is far larger than the breakover voltage of the lightning arrester, and the large current flowing through the lightning arrester continuously exceeds 1000mS, so that the lightning arrester is overheated and burst, and therefore an effective high-voltage cable sheath current suppression method and a large-capacity discharge gap are urgently needed to be researched to reform a new valley energy line circuit, and the existing problems are thoroughly solved.
The utility model has the following contents:
the utility model aims at providing a 110kV single core high tension cable circulation suppression system.
The above purpose is realized by the following technical scheme:
a110 kV/single core high voltage cable circulation restraint system comprises: the electric power transmission system comprises a cable joint connected with a high-voltage cable, the cable joint is a cable joint of a 110 kV/three-phase transmission line, and the high-voltage cable is connected section by section through a stress cone, insulation and an aluminum sheath to form a power transmission channel.
According to the 110 kV/single-core high-voltage cable circulation restraining system, the number of the sheath current restraining reactors is 3, and the protection grade of the grounding box is IP 33.
Has the advantages that:
the utility model relates to a 110kV single core high tension cable circulation restraint system, through single core high tension cable sheath current suppression method, sheath current suppression reactor and special grounding box have been designed, the sheath arrester has been improved, single core high tension cable circulation flow has been solved and big difficult problem has been flowed, cable life has been improved, reduce the emergence of cable accident, the technique is comparatively simple and convenient relatively, can be popularized in the aspect of the electric power application, to the staff of tour cable, factor of safety has also had very big improvement, economic benefits is high.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
wherein: 1. the grounding box comprises a grounding box body 2, a lightning arrester body 3, a sheath current suppression reactor 4, a connecting cable 5, a cable joint 6, a stress cone 7, insulation 8 and an aluminum sheath.
The specific implementation mode is as follows:
example 1:
a110 kV/single core high voltage cable circulation restraint system comprises: the electric power transmission system comprises a sheath current suppression reactor 3, wherein lightning arresters 2 are connected in parallel at two ends of the sheath current suppression reactor, the sheath current suppression reactor and the lightning arresters are installed in a grounding box 1 and are connected into the power transmission system through connecting cables 4, the power transmission system comprises cable joints 5 connected with high-voltage cables, the cable joints are cable joints of 110 kV/three-phase power transmission lines, and the high-voltage cables are connected section by section through materials such as stress cones 6, insulation 7 and aluminum sheaths 8 to form a channel for long-distance power transmission.
Example 2:
according to the 110 kV/single-core high-voltage cable circulating current suppression system in the embodiment 1, the number of the sheath current suppression reactors is 3, and the protection grade of the grounding box is IP 33.
Example 3:
according to embodiment 1 the 110 kV/single-core high-voltage cable circulation suppression system, the design of the grounding box is similar to that of the existing grounding box, the grounding box can be replaced in an electrified mode by at least using the same base, the stainless steel shell is adopted, the grounding box can be used outdoors for a long time, the louver is arranged, heat dissipation is facilitated, lightning arresters are connected in parallel to the two ends of the sheath current suppression reactor, and high-voltage pulses caused by high-frequency current at the two ends of the sheath current suppression reactor are prevented from damaging the insulation of the sheath current suppression reactor.
Claims (2)
1. A110 kV single core high tension cable circulation restraint system, its constitution includes: sheath current restraines reactor, characterized by: the lightning arresters are connected in parallel at two ends of the sheath current suppression reactor, the sheath current suppression reactor and the lightning arresters are installed in the grounding box and are connected into a power transmission system through connecting cables, the power transmission system comprises cable joints connected with high-voltage cables, the cable joints are cable joints of a 110kV three-phase power transmission line, and the high-voltage cables are connected section by section through stress cones, insulating sleeves and aluminum sheaths to form a power transmission channel.
2. The 110kV single-core high-voltage cable circulating current suppression system as claimed in claim 1, wherein: the number of the sheath current suppression reactors is 3, and the protection grade of the grounding box is IP 33.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020932503.3U CN213043436U (en) | 2020-05-28 | 2020-05-28 | Circulation restraining system for 110kV single-core high-voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020932503.3U CN213043436U (en) | 2020-05-28 | 2020-05-28 | Circulation restraining system for 110kV single-core high-voltage cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213043436U true CN213043436U (en) | 2021-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020932503.3U Active CN213043436U (en) | 2020-05-28 | 2020-05-28 | Circulation restraining system for 110kV single-core high-voltage cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213043436U (en) |
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2020
- 2020-05-28 CN CN202020932503.3U patent/CN213043436U/en active Active
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