CN204359902U - A kind of integral type end device for power cable flash test step by step - Google Patents
A kind of integral type end device for power cable flash test step by step Download PDFInfo
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- CN204359902U CN204359902U CN201520019226.6U CN201520019226U CN204359902U CN 204359902 U CN204359902 U CN 204359902U CN 201520019226 U CN201520019226 U CN 201520019226U CN 204359902 U CN204359902 U CN 204359902U
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- cable
- end device
- integral type
- clamp
- power cable
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Abstract
The utility model relates to the integral type end device for power cable flash test step by step, comprising: Clamp for connecting cables tool, comprises the chuck that two are respectively used to clamping cable two ends; High pressure leading-off rods, is connected with Clamp for connecting cables tool, for applying trial voltage for cable two ends; Housing, inside is provided with insulation assembly, comprises bushing for holding high pressure leading-off rods and for the metal can holding Clamp for connecting cables tool and wear for cable; Electric cable heating assembly, is connected with cable, for heating cables.Compared with prior art, the utility model adopts the mode at Clamp for connecting cables tool difference clamping cable two ends, cable conductor is formed closed at terminal inner, and simplified apparatus makes heating and alive connection all comparatively for convenience with reliable.
Description
Technical field
The utility model relates to a kind of electric force test device, especially relates to a kind of integral type end device for power cable flash test step by step.
Background technology
At present, carrier for electric power transfer is mainly pole line and power cable two kinds, and increasing year by year along with the consumption of the process power cable of urbanization, in China, the annual newly-increased consumption of 110kV and 220kV crosslinked polyetylene insulated (hereinafter referred to as XLPE) is at more than 3000km, and some megalopolis (such as Shanghai, Beijing) has brought into use 500kV crosslinked cable.Standard about High Voltage XLPE Power Cable has IEC60840, IEC62067 (IEC), GB/T 11017, GB/Z 18890 and GB/T 22078 (national standard), high-pressure cross-linking cable product and laid down cost higher, therefore people are promoting the quality of high-pressure cross-linking cable and life-span in constantly exploratory development always.Above mentioned standard is cable life and relates to.About crosslinked cable life search, way general is at present exactly indoorly puncture resistance to platen press step by step by cable breakdown in test, by multiple data that puncture at the life index n carrying out statistical computation acquisition crosslinked cable, thus the design of high-tension cable can be optimized or obtain cable tenure of use comparatively reliably, this is particularly important to raising urban electric power safety.For 110kV and above cable, being the test terminal of cable with maximum technical difficulty during flash test step by step, the device that test terminal matches with high-voltage cable end in testing laboratory, there is no test terminal, the termination that voltage can not add cable in other words can puncture, thus does not reach the test objective punctured step by step.
At present, for high-tension cable test terminal, mainly use deionized water terminal, this terminal is widely used in the delivery test of cable.But for flash test step by step, because magnitude of voltage is higher, (voltage breakdown of 110kV cable is generally at more than 500kV, the voltage breakdown of 220kV cable is while at more than 700kV), and need to apply voltage several hours even tens hours continuously, this is unaccommodated for deionized water terminal, reason is that water terminal utilizes water all to press, namely between insulating surface and the inner sleeve of terminal, and between inner sleeve and outer tube, be full of deionized water, cut two ends and connect high-field electrode and low-field electrode respectively, usual electrical conductivity of water controls at 0.05us/cm ~ 0.2us/cm, according to all pressing principle, in order to reduce the field intensity of terminal inner, apply voltage higher, conductivity should be higher.And the heating power in water for U2/R, (U is applied voltage, R is the resistance of the water between high-low pressure electrode), therefore along with rising, the conductivity rising (namely resistance declines) of voltage, heating power will exponentially increase, this will cause terminal inner temperature sharply to raise, this just causes abort or the cable of terminal inner punctures, and finally cannot obtain efficiency test data.And electric pressure is lower, because its outer insulation diameter is less, the liquid water content in the unit length of therefore water terminal inner is more, and resistance is less, also more easily generates heat.Therefore for 110kV and above cable utilize puncture step by step withstand voltage carry out studying almost beyond example, reason is just do not have suitable test terminal.
In addition and for example Chinese patent CN 103809085A discloses a kind of termination for cable voltage test and cable voltage method of testing, termination comprises: housing, housing comprises the first connecting portion and the second connecting portion for being connected cable to be tested, and the inside of housing forms cavity; Contact part, contact part be arranged in cavity at least partially, contact part is connected with housing by the first connecting portion; Leading part, leading part is arranged on the outside of cavity, and leading part is connected with contact part; For being filled with the air valve of insulating gas in cavity, air valve is arranged on housing.The cable termination of test cable is arranged in the cavity of termination, insulation gas filled in cavity.But this termination only can one end of stube cable, when carrying out voltage test, is generally by two single terminals, if desired conductor is closed connects, must another line in succession between two terminals, and to ensure that line can not be put a little or flashover low pressure end, operate and also comparatively bother.
Summary of the invention
The purpose of this utility model is exactly provide a kind of integral type end device for power cable flash test step by step reducing that place takies to overcome defect that above-mentioned prior art exists.
The purpose of this utility model can be achieved through the following technical solutions:
For an integral type end device for power cable flash test step by step, comprising:
Clamp for connecting cables tool, comprises the chuck that two are respectively used to clamping cable two ends;
High pressure leading-off rods, is connected with Clamp for connecting cables tool, for applying trial voltage for cable two ends;
Housing, inside is provided with insulation assembly, comprises bushing for holding high pressure leading-off rods and for the metal can holding Clamp for connecting cables tool and wear for cable;
Electric cable heating assembly, is connected with cable, for heating cables.
Described insulation assembly comprises two the oil gas cofferdams being located at two ends in metal can respectively, and two chucks of described Clamp for connecting cables tool are placed in two oil gas cofferdams respectively.
Be provided with oilpaper type stress cone in described two oil gas cofferdams, described two oilpaper type stress cones are sheathed on after on the exposed cable conductor in cable two ends respectively, by two chucks cable conductor termination, clamping cables two ends respectively of Clamp for connecting cables tool.
Described oilpaper type stress cone is prefabricated capacitance cone.
Insulating oil is filled with in described oil gas cofferdam.
Insulation gas is all filled with between described oil gas cofferdam and metal can and between high pressure leading-off rods and bushing.
Described two oil gas cofferdams are interconnected by Clamp for connecting cables tool and at angle.
Described two oil gas cofferdam angulations are obtuse angle.
Described electric cable heating assembly is punching transformer, and described punching transformer is sheathed on cable.
Described bushing top is provided with high-tension shielding cover, and described high pressure leading-off rods is connected with high-tension electricity potential source by high-tension shielding cover.
Compared with prior art, the utility model has the following advantages:
1) usually with when carrying out voltage test, be generally by two single terminals (such as two water terminals), if desired conductor is closed connects, must another line in succession between two terminals, and to ensure that line can not be put a little or flashover low pressure end, operation also comparatively bothers; This device structurally designs cleverly, cable conductor is formed closed at terminal inner, and then makes heating and alive connection all comparatively for convenience of with reliable, also can reduce taking of place.
2) terminal inner does not re-use deionized water, and use prefabricated oilpaper type stress cone coordinated insulation medium instead, the heating of the conductance loss of terminal inner at higher voltages can be avoided to cause breakdown point to appear at the phenomenon of terminal inner, and withstand voltage test can be carried out for a long time;
3) two oil gas cofferdams are interconnected by Clamp for connecting cables tool and can are that the connection of cable is more natural at angle.
4) oilpaper type stress cone is that prefabricated capacitance cone can make the cargo handling process of cable convenient.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is plan structure schematic diagram of the present utility model;
Wherein: 1, cable, 2, metal can, 3, oil gas cofferdam, 4, insulating oil, 5, oilpaper type stress cone, 6, Clamp for connecting cables tool, 7, cable conductor, 8, high pressure leading-off rods, 9, insulate gas, and 10, bushing, 11, high-tension shielding cover, 12, punching transformer.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.The present embodiment is implemented premised on technical solutions of the utility model, give detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
A kind of integral type end device for power cable flash test step by step, as shown in Figure 1, comprise Clamp for connecting cables tool 6, high pressure leading-off rods 8, housing and electric cable heating assembly, wherein Clamp for connecting cables tool 6 comprises two chucks, two chucks are respectively used to two terminations of clamping cable 1, high pressure leading-off rods 8 is connected with Clamp for connecting cables tool 6, for applying trial voltage for cable 1 two ends, housing, comprise bushing 10 for holding high pressure leading-off rods 8 and for the metal can 2 holding Clamp for connecting cables tool 6 and wear for cable 1, wherein metal can 2 is tubular, enclosure interior is provided with insulation assembly, electric cable heating assembly is connected with cable 1, for heating cables 1.
Insulation assembly comprises two the oil gas cofferdams 3 being located at two ends in metal can 2 respectively, and two chucks of Clamp for connecting cables tool 6 are placed in two oil gas cofferdams 3 respectively.
Oilpaper type stress cone 5 is provided with in two oil gas cofferdams 3, two oilpaper type stress cones 5 are sheathed on after on the exposed cable conductor 7 in cable 1 two ends respectively, by two chucks cable conductor 7 termination, clamping cables 1 two ends respectively of Clamp for connecting cables tool 6, wherein oilpaper type stress cone 5 is prefabricated capacitance cone.
Insulating oil 4 is filled with in oil gas cofferdam 3.
The gas 9 that insulate all is filled with between oil gas cofferdam 3 and metal can 2 and between high pressure leading-off rods 8 and bushing 10.
As shown in Figure 2, two oil gas cofferdams 3 are interconnected by Clamp for connecting cables tool 6 and at angle.
The angle value of two oil gas cofferdam 3 angulations specifically sets according to cable 1 length, and be preferably obtuse angle, cable 1 length is longer, and angle is larger, because cable has pliability, when cable 1 length is longer, also can be 180 degree of angles.
Electric cable heating assembly is punching transformer 11, and punching transformer 11 is sheathed on cable 1.
Bushing 10 top is provided with high-tension shielding cover 11, and high pressure leading-off rods 8 is connected with high-tension electricity potential source by high-tension shielding cover 11.
When needs to one section of high-tension cable carry out step by step flash test time, first each layer beyond being insulated at cable 1 two ends divests, the length that divests of often holding is about 2m, and make end portion exposed length be about the cable conductor 7 of 100mm, then prefabricated oilpaper type stress cone 5 is put respectively, insert from the both sides of metal can 2 again, make two terminations of the cable conductor 7 at two ends and two chuck compact siro spinning technology of Clamp for connecting cables tool 6, then insulating oil 4 is full of two oil gas cofferdams 3 inner, cable two ends are not divested metallic sheath part and cylindrical metal tank 2 connecting part carries out sealing and fixing.Between oil gas cofferdam 3 with metal can 2 and the space of bushing 10 inside be communicated with, and by insulation gas 9 be full of, the gas 9 that insulate in the present embodiment selects sulfur hexafluoride gas, and its pressure remains on more than 0.5MPa at normal temperatures.High pressure leading-off rods 8 stube cable jockey 6 and outside high-tension shielding cover 11.After assembling by foregoing description, the cable conductor 7 of tested cable 1 has formed a closed loop, the part in its loop is positioned at end device inside, remainder is positioned at exterior of terminal, punching transformer 12 on the loop feature cover of exterior of terminal, its effect playing current source is in order to heat to cable conductor 7.The lead-in wire of high-tension electricity potential source is connected the high-tension shielding cover 11 in this device simultaneously.So just can test.Normally make cable conductor 7 surface temperature reach 90 degree (this value is the Long-term service temperature that XLPE allows), execute alive object by insulation breakdown.
Claims (10)
1., for an integral type end device for power cable flash test step by step, it is characterized in that, comprising:
Clamp for connecting cables tool, comprises the chuck that two are respectively used to termination, clamping cable two ends;
High pressure leading-off rods, is connected with Clamp for connecting cables tool, for applying trial voltage for cable two ends;
Housing, inside is provided with insulation assembly, comprises bushing for holding high pressure leading-off rods and for the metal can holding Clamp for connecting cables tool and wear for cable;
Electric cable heating assembly, is connected with cable, for heating cables.
2. a kind of integral type end device for power cable flash test step by step according to claim 1, it is characterized in that, described insulation assembly comprises two the oil gas cofferdams being located at two ends in metal can respectively, and two chucks of described Clamp for connecting cables tool are placed in two oil gas cofferdams respectively.
3. a kind of integral type end device for power cable flash test step by step according to claim 2, it is characterized in that, oilpaper type stress cone is provided with in described two oil gas cofferdams, described two oilpaper type stress cones are sheathed on after on the exposed cable conductor in cable two ends respectively, by two chucks cable conductor termination, clamping cables two ends respectively of Clamp for connecting cables tool.
4. a kind of integral type end device for power cable flash test step by step according to claim 3, it is characterized in that, described oilpaper type stress cone is prefabricated capacitance cone.
5. a kind of integral type end device for power cable flash test step by step according to claim 2, is characterized in that, be filled with insulating oil in described oil gas cofferdam.
6. a kind of integral type end device for power cable flash test step by step according to claim 2, is characterized in that, be all filled with insulation gas between described oil gas cofferdam and metal can and between high pressure leading-off rods and bushing.
7. a kind of integral type end device for power cable flash test step by step according to claim 2, is characterized in that, described two oil gas cofferdams are interconnected by Clamp for connecting cables tool and at angle.
8. a kind of integral type end device for power cable flash test step by step according to claim 7, it is characterized in that, described two oil gas cofferdam angulations are obtuse angle.
9. a kind of integral type end device for power cable flash test step by step according to claim 1, it is characterized in that, described electric cable heating assembly is punching transformer, and described punching transformer is sheathed on cable.
10. a kind of integral type end device for power cable flash test step by step according to claim 1, it is characterized in that, described bushing top is provided with high-tension shielding cover, and described high pressure leading-off rods is connected with high-tension electricity potential source by high-tension shielding cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520019226.6U CN204359902U (en) | 2015-01-12 | 2015-01-12 | A kind of integral type end device for power cable flash test step by step |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520019226.6U CN204359902U (en) | 2015-01-12 | 2015-01-12 | A kind of integral type end device for power cable flash test step by step |
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| CN204359902U true CN204359902U (en) | 2015-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520019226.6U Withdrawn - After Issue CN204359902U (en) | 2015-01-12 | 2015-01-12 | A kind of integral type end device for power cable flash test step by step |
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| CN (1) | CN204359902U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535910A (en) * | 2015-01-12 | 2015-04-22 | 国网上海市电力公司 | Integrated terminal device used for power cable step-by-step puncture test |
| CN110456243A (en) * | 2019-09-04 | 2019-11-15 | 国网电力科学研究院有限公司 | A kind of insulation sample dc breakdown test device |
-
2015
- 2015-01-12 CN CN201520019226.6U patent/CN204359902U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535910A (en) * | 2015-01-12 | 2015-04-22 | 国网上海市电力公司 | Integrated terminal device used for power cable step-by-step puncture test |
| CN110456243A (en) * | 2019-09-04 | 2019-11-15 | 国网电力科学研究院有限公司 | A kind of insulation sample dc breakdown test device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150527 Effective date of abandoning: 20170825 |