CN206224874U - A kind of single band metal sheath cable jacket earth fault analogue means - Google Patents
A kind of single band metal sheath cable jacket earth fault analogue means Download PDFInfo
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- CN206224874U CN206224874U CN201621172309.XU CN201621172309U CN206224874U CN 206224874 U CN206224874 U CN 206224874U CN 201621172309 U CN201621172309 U CN 201621172309U CN 206224874 U CN206224874 U CN 206224874U
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Abstract
A kind of single band metal sheath cable jacket earth fault analogue means, using epoxy resin board (1) as base plate, A is set on epoxy resin board (1), B two-phases, B phases are failure phase, A phases are for intact to photograph, in earth fault phase B phases a to b, fault-free between photograph A phases a1 to b1 to building a pvc pipe plane (3) for semi-section, connected with electric wire (2) in the pvc pipe plane of the semi-section between a and b, one layer of semi-conductive tape uniform winding is first used outside electric wire (2) insulating barrier, afterwards again with insulating tape one layer of real structure with artificial mains network of uniform winding etc.；The beneficial effects of the utility model are：1) a kind of single band metal sheath cable jacket earth fault analogue means laboratory test completes feasible；2) a kind of versatility of single with metal sheath cable jacket earth fault analogue means, comprehensive, feasibility-field failure simulation teching checking, improvement, optimization.
Description
Technical field
The utility model belongs to power industry, high-tension cable trouble shoot apparatus structure technical field.
Background technology
In recent years, as the rare and resident of land resource is to landscape requirement more and more higher, city cable line project is every
Year is increasing considerably.At present, more than 110kV high-tension cables are generally cross-linked polyethylene insulating single core band metal sheath in power network
Cable.The alternating magnetic field that its operating current is produced produces induced voltage on protective metal shell, when single-core cable core passes through electric current
When just have magnetic line of force interlinkage metal sheath, produce induced voltage, the size of induced voltage and cable length and flow through cable
Electric current is directly proportional, and the metallic shield grounding mode that should be taken various forms limits the size of voltage.
The insulation status quality of oversheath, has been directly connected to whether metal sheath induced voltage induced voltage obtains effectively
Limitation.As oversheath is damaged, path is formed by the earth or return wire, then circulation will be produced on protective metal shell, so as to cause electricity
Cable current-carrying capacity declines, and ground wire and cable cover(ing) can be even burnt when generating heat serious, triggers the accidents such as fire.Also, it is long-term
Circulating current in sheath will cause the aging acceleration of cable, influence cable service life.Meanwhile, too high inductive drop entail dangers to life peace
Entirely.The quality of situation it may be said that oversheath insulate, is a key index of high-tension cable health condition.
Because single band metal sheath cable jacket trouble shoot technical requirements are high, there need to be certain experiences, and scene is real
Border situation is complicated, and the working time is tight, task weight, it is difficult to allow the personnel of lack of skill to be operated.Accordingly, it would be desirable to develop one kind
The analogue means consistent with oversheath earth fault principle, feature.
The content of the invention
The purpose of this utility model precisely in order to overcome defect that above-mentioned prior art is present and design a kind of easy to use,
Can device of the analogue simulation single with metal sheath cable jacket earth fault, murry electric bridges, discharging sound can be used
Method of sounding out the people in a given scope one by one in order to break a criminal case searches trouble point.
The utility model is achieved by the following technical solution.
A kind of single band metal sheath cable jacket earth fault analogue means, it is characterised in that use asphalt mixtures modified by epoxy resin
Fat plate sets A, B two-phase as base plate on epoxy resin board, and B phases are failure phase, and A phases are intact to photograph, in earth fault
Phase B phase a to b, fault-free between photograph A phases a1 to b1 to building a pvc pipe plane for semi-section, the semi-section between a and b
Pvc pipe plane on run wires to, outside electric wire insulation layer first use one layer of semi-conductive tape uniform winding, afterwards again it is equal with insulating tape
One layer of real structure with artificial mains network of even winding, the electric wire midpoint between a, b breaks outermost layer insulating tape, from semiconductive
Belt is drawn a wire and connects a spark gap device again by setting analogue ground device (trouble point) ground connection；a1、
Adopted between b1 and run wires to, one layer of semi-conductive tape uniform winding is first used outside electric wire insulation layer, uniformly twined with insulating tape again afterwards
Around one layer of real structure with artificial mains network.
The beneficial effects of the utility model are：1) a kind of single band metal sheath cable jacket earth fault simulation dress
Put-laboratory test complete it is feasible；
2) versatility of a kind of single with metal sheath cable jacket earth fault analogue means, comprehensive, feasible
Property-field failure simulation teching checking, improve, optimization.
Brief description of the drawings
Fig. 1 is the utility model structural representation；
1- epoxy resin boards in figure, 2- electric wires, 3- semi-sections pvc pipe, 4- spark gaps, 5- earthing or grounding means,
A1 to b1- fault-frees are to photograph A phases, a to b- earth fault phase B phases；
Fig. 2 is MURRAY electric bridge positioning schematics；
Fig. 3 is bridge method schematic diagram.
Specific embodiment
See Fig. 1, a kind of single band metal sheath cable jacket earth fault analogue means, it is characterised in that use
Epoxy resin board 1 as base plate, on epoxy resin board 1 set A, B two-phase, B phases be failure phase, A phases for it is intact to photograph,
Earth fault phase B phase a to b, fault-free to building a pvc pipe plane 3 for semi-section between photograph A phases a1 to b1, in a and b
Between semi-section pvc pipe plane on connected with electric wire 2, outside the insulating barrier of electric wire 2 first use one layer of semi-conductive tape uniform winding, after
Insulating tape one layer of real structure with artificial mains network of uniform winding is used again, and the midpoint of electric wire 2 between a, b breaks outermost layer insulation
Adhesive tape, draws a wire and connects a spark gap device 4 again by setting analogue ground device from semiconductive belt【Therefore
Barrier point】5 ground connection；Connected using electric wire 2 between a1, b1, one layer of semi-conductive tape uniform winding is first used outside the insulating barrier of electric wire 2, after
Insulating tape one layer of real structure with artificial mains network of uniform winding is used again.
1st, operation principle of the present utility model
By the use of epoxy resin board as platform, with electric wire dummycable, cut analogue ground failure is set on electric wire,
A kind of single band metal sheath cable jacket earth fault analogue means has been built in limited spatial dimension.
2nd, the application method of platform：
The applicable two kinds of singles band metal sheath cable jacket earth fault analogue means of this platform is listed below
Application method.See Fig. 2.
3.1 murray bridge methods
Murray bridge methods are pre-determined bit of the principle based on murray electric bridges to trouble point, i.e., the localization of faults is general
Position.Two trouble points can be used the method measurement position of failure point.
First, A, B two-phase cable insulating sheath situation are tested and record in detail is done.Then, the best A phases of selection insulation are
Auxiliary phase, B be failure phase, principle such as Fig. 2,
Resistance ratio P can be read by dial disk；
P values are measured, trouble point is tried to achieve by bringing formula into apart from L1：
L1The L formulas (1) of=2P ‰
3rd, sounding fix point method
See Fig. 3, sounding fixed point mainly uses the electric discharge sound of trouble point to pinpoint, using the high-tension apparatus of pressure-adjustable, makes
Ground is passed in trouble point disruptive discharge, the mechanical oscillation produced during failure gap discharge, just hears spark gap (4) ", "
Sound, sufficiently accurately cable fault can be pinpointed using this phenomenon.
Claims (1)
1. a kind of single is with metal sheath cable jacket earth fault analogue means, it is characterised in that use epoxy resin
Plate (1) sets A, B two-phase as base plate on epoxy resin board (1), and B phases are failure phase, and A phases, to photograph, are being grounded for intact
Failure phase B phase a to b, fault-free to building a pvc pipe plane (3) for semi-section between photograph A phases a1 to b1, between a and b
Semi-section pvc pipe plane on electric wire (2) connect, outside electric wire (2) insulating barrier first use one layer of semi-conductive tape uniform winding,
Use insulating tape one layer of real structure with artificial mains network of uniform winding again afterwards, electric wire (2) midpoint between a, b breaks outermost layer
Insulating tape, draws a wire and connects a spark gap device (4) again by setting analogue ground dress from semiconductive belt
Put (trouble point) (5) ground connection；Connected using electric wire (2) between a1, b1, it is first uniform with semi-conductive tape outside electric wire (2) insulating barrier
One layer of winding, uses insulating tape one layer of real structure with artificial mains network of uniform winding again afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621172309.XU CN206224874U (en) | 2016-10-26 | 2016-10-26 | A kind of single band metal sheath cable jacket earth fault analogue means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621172309.XU CN206224874U (en) | 2016-10-26 | 2016-10-26 | A kind of single band metal sheath cable jacket earth fault analogue means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206224874U true CN206224874U (en) | 2017-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621172309.XU Active CN206224874U (en) | 2016-10-26 | 2016-10-26 | A kind of single band metal sheath cable jacket earth fault analogue means |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828408A (en) * | 2018-07-11 | 2018-11-16 | 江阴市华能电热器材有限公司 | The device and method of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination |
-
2016
- 2016-10-26 CN CN201621172309.XU patent/CN206224874U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828408A (en) * | 2018-07-11 | 2018-11-16 | 江阴市华能电热器材有限公司 | The device and method of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination |
| CN108828408B (en) * | 2018-07-11 | 2023-06-06 | 江阴市华能电热器材有限公司 | Device and method for nondestructively measuring buried skin effect electric tracing high-resistance grounding fault |
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