CN206650184U - A kind of single-core cable sheath ground structure - Google Patents
A kind of single-core cable sheath ground structure Download PDFInfo
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- CN206650184U CN206650184U CN201720445466.1U CN201720445466U CN206650184U CN 206650184 U CN206650184 U CN 206650184U CN 201720445466 U CN201720445466 U CN 201720445466U CN 206650184 U CN206650184 U CN 206650184U
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Abstract
Distribution technique field is the utility model is related to, discloses a kind of single-core cable sheath ground structure.Three-phase single-core cable and protection structure are specifically included, the every single-core cable has protective case, and described protective case one end is directly grounded, and is grounded after the protective case other end connection protection structure, the protection structure includes arrester and reactor in parallel.The utility model improves single-core cable protective metal shell one end and is directly grounded, and the applicability of one end protective grounding method, which is cheap, and installation workload is small, high safety.
Description
Technical field
Distribution technique field is the utility model is related to, particularly a kind of single-core cable sheath ground structure.
Background technology
When thunder and lightning or overvoltage ripple flow along core, very high impact electricity occurs in the earth-free end of cable metallic screens layer
Pressure；When system occurs short-circuit, when short circuit current flows through core, higher work also occurs in the earth-free end of cable metallic screens layer
Frequency induced voltage, the effect of this overvoltage can not be born and when damaging in metal screen layer insulation, will cause multiple spot occur to connect
Ground, form circulation.GB50217 induced potential feasible value originals are defined as 100V, and rear modification is promoted to 300V.
The earthing mode of conventional high voltage single-core cable has following two kinds：1. protective metal shell two-terminal-grounding, this mode is applied
The workload of work reduces, but the condition used is harsher, it is desirable to which cable run is very short, transimission power very little, transmission capacity have
Very big nargin；2. the cross connection grounding of protective metal shell, the confession distribution for being applicable to cable length as 1000 meters and the above returns
Road, this mode can reduce the induced voltage and circulation of protective metal shell to a certain extent, improve the transmission capacity of cable.
The condition of method 1 is harsher；Though the scope of application of scheme 2 is big, need to be connect using this method using high-voltage cable insulating
Head, the joint involves great expense, installation workload is big, long in time limit.
Utility model content
Goal of the invention of the present utility model is：For above-mentioned problem, there is provided a kind of single-core cable sheath connects
Ground structure.
The technical solution adopted in the utility model is such：A kind of single-core cable sheath ground structure, specifically includes three
Phase single-core cable and protection structure, the every single-core cable have protective case, and described protective case one end is directly grounded, the guarantor
It is grounded after sheath other end connection protection structure, the protection structure includes arrester and reactor in parallel.
Further, the reactor is saturable reactor.
In summary, by adopting the above-described technical solution, the beneficial effects of the utility model are：It is practical, cost
Cheap, installation workload is small, high safety.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Reference：1- arresters, 2- reactors.
Embodiment
Below in conjunction with the accompanying drawings, the utility model is described in detail.
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
As shown in figure 1, a kind of single-core cable sheath ground structure, specifically includes three-phase single-core cable and protection structure, institute
Stating every single-core cable has protective case, and described protective case one end is directly grounded, and the protective case other end connects protection structure
After be grounded, the protection structure includes in parallel arrester 1 and reactor 2.
The reactor 2 is saturable reactor.
During cable run normal operating conditions, cable metal sheath aspergillus ficuum；When lightning surge occurs in circuit, operated
Voltage, when voltage exceedes lightning rod setting value, arrester 1 turns on, and electric current leaks into the earth；The reactance value of reactor 2 should be according to work
The actual conditions setting of journey, when asymmetric earth fault occurs in cable run, saturable reactor tends to saturation, and reactance value subtracts
Small, conducting state is presented in reactor 2 so that fault current can leak into the earth rapidly, play the work of protection protective coverings of cable insulation
With, and now arrester 1 is not turned on.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (2)
1. a kind of single-core cable sheath ground structure, it is characterised in that described every including three-phase single-core cable and protection structure
Single-core cable has protective case, and described protective case one end is directly grounded, and is grounded after the protective case other end connection protection structure,
The protection structure includes arrester and reactor in parallel.
2. single-core cable sheath ground structure as claimed in claim 1, it is characterised in that the reactor is saturation reactance
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720445466.1U CN206650184U (en) | 2017-04-26 | 2017-04-26 | A kind of single-core cable sheath ground structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720445466.1U CN206650184U (en) | 2017-04-26 | 2017-04-26 | A kind of single-core cable sheath ground structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206650184U true CN206650184U (en) | 2017-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201720445466.1U Active CN206650184U (en) | 2017-04-26 | 2017-04-26 | A kind of single-core cable sheath ground structure |
Country Status (1)
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| CN (1) | CN206650184U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165646A (en) * | 2019-04-09 | 2019-08-23 | 山东鲁源电气股份有限公司 | A kind of cable shield electric current bleeder |
| CN111585060A (en) * | 2020-04-29 | 2020-08-25 | 昆明理工大学 | Novel single-core power cable metal sheath grounding mode |
-
2017
- 2017-04-26 CN CN201720445466.1U patent/CN206650184U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165646A (en) * | 2019-04-09 | 2019-08-23 | 山东鲁源电气股份有限公司 | A kind of cable shield electric current bleeder |
| CN111585060A (en) * | 2020-04-29 | 2020-08-25 | 昆明理工大学 | Novel single-core power cable metal sheath grounding mode |
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