CN108918921A - A kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment - Google Patents
A kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment Download PDFInfo
- Publication number
- CN108918921A CN108918921A CN201810884682.5A CN201810884682A CN108918921A CN 108918921 A CN108918921 A CN 108918921A CN 201810884682 A CN201810884682 A CN 201810884682A CN 108918921 A CN108918921 A CN 108918921A
- Authority
- CN
- China
- Prior art keywords
- gis terminal
- receiving portion
- pressure resistance
- ancillary equipment
- submarine cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Abstract
The present invention discloses a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment, it is characterised in that：Including：SF6Cable bin（1）, the SF6Cable bin（1）With interconnected the first receiving portion and the second receiving portion, the end of first receiving portion has lower flange（7）, the GIS terminal of the first receiving portion receiving two kinds of structures of 220V elongated or short（11）And pass through the lower flange（7）With the GIS terminal（11）Snap ring（8）Matching is connected, and second receiving portion accommodates bus（4）, end and outlet casing tube（12）Lower flange（9）Matching connection；The GIS terminal（11）With the bus（4）Connection.The device have the advantages that：Structure is simple, Sizes, carries and easy to use, safety and reliability with higher.
Description
Technical field
The invention belongs to HV cable accessories technical fields, and in particular to a kind of 220kV submarine cable GIS terminal pressure resistance is auxiliary
Help equipment.
Background technique
Before the ac voltage withstanding test that the country should be done before putting into operation to the submarine cable of 220kV or more at present is already necessity
It mentions, but due to the defect of domestic equipment, pressure test is substantially to buy based on overseas equipment, and due to existing in specific works
In complexity and testing equipment quality, the space occupied problem of experiment, so that the sum for carrying out there is a problem of many of pressure test
The pot head part of security risk, especially pressure test.With regard to the cable termination pressure resistance ancillary equipment that the current country uses, knot
Structure is complicated, carry with it is inconvenient for use prompt and exist take up a large area, be not able to satisfy voltage distortion and drift condition and it is breakdown, pacify
The problems such as full property and not high reliability.It is therefore desirable to design a kind of novel 220kV submarine cable GIS terminal pressure resistance ancillary equipment
It is various in submarine cable pressure test to solve the problems, such as.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, a kind of 220kV submarine cable GIS terminal pressure resistance is provided
Ancillary equipment, structure is simple, Sizes, carries and easy to use, safety and reliability with higher.
To solve prior art problem, the invention discloses a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment,
Including：SF6Cable bin, SF6Cable bin has interconnected the first receiving portion and the second receiving portion, the end of the first receiving portion
With lower flange, the first receiving portion accommodates the GIS terminal of two kinds of structures of 220V elongated or short and passes through lower flange and GIS terminal
Snap ring matching be connected, the second receiving portion accommodate bus, end matches connection with the lower flange of outlet casing tube；GIS terminal with
The hanging Hard link of bus.
Preferably,
When first receiving portion accommodates the GIS terminal of 220V short structure, GIS terminal is connect by extension rod with bus.
Preferably,
GIS terminal is connect by adapter with bus.
Preferably,
Full skirt on the outside of outlet casing tube has the alternatively distributed structure of size full skirt.
Preferably,
The central axis of first receiving portion and the central axis of the second receiving portion are mutually perpendicular to, the lower flange of outlet casing tube with
The distance of the central axis of first receiving portion is 300~800mm.
Preferably,
The lower flange of outlet casing tube is 650mm at a distance from the central axis of the first receiving portion.
Preferably,
The height of outlet casing tube is 1680~2160mm.
Preferably,
The radius of bus is 50mm, and the radius for corresponding to shell is 135mm.
Preferably,
Internal shield is provided in outlet casing tube, the height of internal shield is 540~675mm.
Preferably,
The lower flange of internal shield and outlet casing tube is connected directly and is grounded.
The device have the advantages that：Structure is simple, Sizes, carries and easy to use, safety with higher
Property and reliability.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is outlet casing tube inside maximum field intensity values in the present invention；
Fig. 3 is different spacing and inner shield height setting of casing inside maximum field strength electric field mould in the present invention；
Fig. 4 is GIS terminal casing field distribution in the present invention；
Fig. 5 is GIS terminal casing Potential Distributing in the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment, including：SF6Cable bin 1, SF6Cable
Storehouse 1 has interconnected the first receiving portion and the second receiving portion, and the end of the first receiving portion has lower flange 7, the first receiving
The GIS terminal 11 of portion's receiving two kinds of structures of 220V elongated or short simultaneously matches phase with the snap ring 8 of GIS terminal 11 by lower flange 7
Even, the second receiving portion accommodates bus 4, and end matches connection with the lower flange 9 of outlet casing tube 12；GIS terminal 11 and bus 4 are outstanding
Empty Hard link.So-called hanging Hard link refers to that GIS terminal 11 is directly connected to bus 4, in the prior art use benzvalene form it is exhausted
Unlike the support of edge, which does not use any support member that SF can vacantly be arranged in6The company of realization in cable bin 1
It connects, provides advantage to the safety for improving whole device.
It is ontology that GIS terminal 11 in the present invention, which is based on seabed HYJQF41-F-117/220-1*1600+2*24C, is only related to
And copper water-blocking conductor layer, semiconductor water blocking tape layer, XLPE insulating layer, insulation screen, semiconductor waterstop, metal screen layer；
Remainder layer is not in the range of this invention is related to, and the GIS terminal 11 tool is there are two types of configuration, one is 220V short structure,
Length is 620mm, and another kind is 220V elongated structure, and the length is 960mm.For the former, GIS terminal 11 passes through with extension
The adapter 3 of bar 2 is connect with bus 4；For the latter, GIS terminal 11 is directly connect by adapter 3 with bus 4.For SF6
For cable bin 1, it is preset to establish 220kV using this cable as terminal body referring to IEC 62271-209-2007 standard by the present invention
Formula cable termination model, so designing the SF met the requirements based on this standard terminal6Cable bin 1.
Outlet casing tube 12 in the present invention, when carrying out the pressure test of 216kV, the considerations of in order to be safely operated, outlet
Sleeve design is highest withstanding voltage 320kVGrade, electricity when preventing operation from variation occur
Press fluctuation problem, it is ensured that it is safely operated.
Since 12 median generatrix 4 of outlet casing tube bears high voltage, rated current and short circuit current.The design considerations master of bus 4
There is following two o'clock：
1. by rated current size and allow current density select fall cross-sectional area of conductor, for reduce kelvin effect adverse effect and
Use tubing.For bus 4 using aluminium as material, it is i=1A/mm that current density must be allowed by designing and testing experience2。
2. the range for determining 4 outer diameter of bus by allowing to impact field strength E1 value.
4 surface field strength of bus in coaxial cylindrical electric field is：
U is lightning impulse voltage in formula；R1 is 4 radius of bus；R2 is shell radius.Work as lnR2/R1=1, i.e. R2/R1=e
When, E is minimum value Emin, at this time withstanding voltage ability highest, for the outlet casing tube 12 of this 320kV, SF6Work pressure
The impact field strength that power control allows at 0.4MPa, 0.4MPa pressure is 24MV/m.
It can be calculated by formula 1：The radius of bus 4 is 49.8mm, and for the convenience of production, the present invention takes 50mm, under corresponding
The radius of the inside of flange 9 is taken as 135mm, i.e. R1=50mm, R2=135mm.
Due to withstanding voltage be measure casing can safe and stable operation important parameter, withstanding voltage value be by it is dry dodge away from
From decision, and dry arc distance is then mainly determined by full skirt shape.The shape of the full skirt 5 of outlet casing tube 12 directly decides dry
The size for dodging distance, so the improvement of beveled structure has important influence to the external insulation of casing.Certain incline when casing has
When rake angle, to increase its dry arc distance, the present invention uses the alternatively distributed umbrella skirt construction of size full skirt.Due to the resistance of major diameter umbrella
Gear increases dry arc distance, and then enhances the external insulation performance of insulator, since this outlet casing tube is served only for pressure test, i.e.,
Laboratory test uses, and only need to consider dry arc distance, is not required to consider pollution flashover distance and creepage distance, and dry arc distance refers to metal
Electrode is to the shortest straight line distance between lower metal electrode, and the present invention is the pressure resistance using the outlet casing tube 12 of 320kV as 216kV
The indoor outlet casing tube of test, referring to formula 3：
K in formula3For nonuniformity coefficient, value 1.5；K4For safety coefficient, value range is 1.4~1.8；U is that power frequency is resistance to
By voltage, it is taken as 320kV；ErFor the tangential field that insulating surface allows, the field strength that corresponding highest withstanding voltage allows is
0.4MV/m, i.e. value are 0.4MV/m；Therefore the altitude range that outlet casing tube 12 is calculated is 1680~2160mm.
As a typical height value, the total length of outlet casing tube 12 is 2000mm, is greater than the dry sudden strain of a muscle of required satisfaction
Distance, then judge whether its internal electric field maximum value meets the field strength maximum on insulator surface in condition and atmosphere by Electric Field Simulation
Whether value is less than the disruptive field intensity 3MV/m of air.
In the present invention, the central axis of the first receiving portion and the central axis of the second receiving portion are mutually perpendicular to, outlet casing tube
12 lower flange 9 at a distance from the central axis of the first receiving portion 10 be 300~800mm., calculation method is as follows：
GIS terminal, which is fixed with the first receiving portion by its lower flange 7, to be connected, and pours SF after vacuumizing to it6
Gas, controlling its operating pressure is 0.4MPa.
Due to the mainly slightly uneven electric field structure of practical engineering application, work as SF6Maximum field strength in gap reaches certain
When one numerical value, gap can be breakdown, and the engineering Breakthrough Field Intensity E under power-frequency voltagebtFor：
Ebt=65 (10p)0.734；
P is SF in formula6The minimum absolute pressure of gas inflated, for different disruptive field intensities under different pressures, such as 1 institute of table
Show.
1 power-frequency voltage flashover field strength of table
As shown in Table 1, when operating pressure is 0.4MPa, the disruptive field intensity under power-frequency voltage is 17.9MV/m, due to this
The alternating voltage of 29Hz is used in embodiment, the disruptive field intensity allowed is substantially close with the disruptive field intensity of the power-frequency voltage of 50Hz
Seemingly, so inside SF6Gas field strength can meet the condition of operation no more than power frequency disruptive field intensity.
Since various pieces are according to designed by pressure-resistant standard, resistance to voltage levels have met the pressure-resistant water under corresponding voltage substantially
It is flat, so carrying out size to the cable termination pressure resistance auxiliary casing of design under conditions of satisfaction allows to allow disruptive field intensity
Optimization, while the electric field inside the first receiving portion is small as far as possible.Electricity is carried out using Comsol Multiphysics simulation software
Field emulation adds frequency to be 29Hz casing outlet joint part, and amplitude is the alternating voltage of 320kV, and outlet casing tube lower flange connects
Ground, while 300~800mm is chosen, parametric simulation is carried out every 50mm, as shown in Fig. 2, due to outlet casing tube and cable termination
Downward trend is presented in the continuous increase of spacing, the electric field strength inside the first receiving portion, when the two is closer as 300mm,
Its internal maximum field reaches 16.272MV/m, and with the increase of distance its to reduce amplitude larger, when between the two away from continuing to increase
Reduce to the amplitude that after 700mm, electric field is reduced greatly, is found by emulation, when spacing is greater than 800mm with the increase of spacing, the
Maximum field inside one receiving portion is examined almost without significant change so medium spacing range of the present invention is 300~800mm simultaneously
The height for considering inner shield is as shown in Figure 3 by emulating its result.
In the present invention, internal shield 6 is provided in outlet casing tube 12, the height of internal shield 6 is 540~675mm.Interior screen
The lower flange 9 for covering layer 6 and outlet casing tube 12 is connected directly and is grounded.As a kind of typical size, electric field is comprehensively considered
The problem of most value size and spacing optimization reasonability and saving inner shield material etc., choose spacing 650mm, inner shield
570mm, field distribution situation is as shown in figure 4, the maximum value of inside pipe casing electric field is 11.806MV/m at this time, much smaller than breakdown field
Strong 17.9MV/m, electric field maximum meet the disruptive field intensity for being less than air inner shield place, maximum value 2.0558MV/m
Value 3MV/m.
Cable termination pressure resistance assists shown in casing potential profile 5, and internal Potential Distributing meets theoretical case, every special
Property index meet the requirement of validity under the premise of, optimize the size and layout of cable termination pressure resistance auxiliary casing, save
A large amount of space and material are very helpful to cable voltage test.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment, it is characterised in that：Including：SF6Cable bin (1), it is described
SF6Cable bin (1) has interconnected the first receiving portion and the second receiving portion, and the end of first receiving portion has laxative remedy
Blue (7), the GIS terminal (11) of the first receiving portion receiving two kinds of structures of 220kV elongated or short simultaneously pass through the lower flange
(7) it is connected with the matching of the snap ring (8) of the GIS terminal (11), second receiving portion accommodates bus (4), end and outlet
The lower flange (9) of casing (12) matches connection；The GIS terminal (11) and the bus (4) hanging Hard link.
2. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment according to claim 1, it is characterised in that：
When GIS terminal (11) of the first receiving portion receiving 220V short structure, the GIS terminal (11) passes through extension rod
(2) it is connect with the bus (4).
3. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment according to claim 1 or 2, it is characterised in that：
The GIS terminal (11) is connect by adapter (3) with the bus (4).
4. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment according to claim 1, it is characterised in that：
Full skirt (5) on the outside of the outlet casing tube (12) has the alternatively distributed structure of size full skirt.
5. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment according to claim 1, it is characterised in that：
The central axis of first receiving portion and the central axis of second receiving portion are mutually perpendicular to, the outlet casing tube
(12) lower flange (9) is 300~800mm at a distance from the central axis of first receiving portion.
6. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment according to claim 5, it is characterised in that：
The lower flange (9) of the outlet casing tube (12) is 650mm at a distance from the central axis of first receiving portion.
7. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment according to claim 1, it is characterised in that：
The height of the outlet casing tube (12) is 1680~2160mm.
8. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment according to claim 1, it is characterised in that：
The radius of the bus (4) is 50mm, and the radius for corresponding to shell is 125mm.
9. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment according to claim 1, it is characterised in that：
It is provided with internal shield (6) in the outlet casing tube (12), the height of the internal shield (6) is 540~675mm.
10. a kind of 220kV submarine cable GIS terminal pressure resistance ancillary equipment according to claim 9, it is characterised in that：
The lower flange (9) of the internal shield (6) and the outlet casing tube (12) is connected directly and is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810884682.5A CN108918921B (en) | 2018-08-06 | 2018-08-06 | Withstand voltage auxiliary assembly of 220kV submarine cable GIS terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810884682.5A CN108918921B (en) | 2018-08-06 | 2018-08-06 | Withstand voltage auxiliary assembly of 220kV submarine cable GIS terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108918921A true CN108918921A (en) | 2018-11-30 |
| CN108918921B CN108918921B (en) | 2020-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810884682.5A Active CN108918921B (en) | 2018-08-06 | 2018-08-06 | Withstand voltage auxiliary assembly of 220kV submarine cable GIS terminal |
Country Status (1)
| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111025105A (en) * | 2019-12-27 | 2020-04-17 | 安徽明诚电力设备安装有限公司 | Ring main unit equipment sleeve withstand voltage test device |
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| Publication number | Publication date |
|---|---|
| CN108918921B (en) | 2020-07-17 |
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