CN106597192A - Transformer grounding resistance device and method for detecting the same - Google Patents
Transformer grounding resistance device and method for detecting the same Download PDFInfo
- Publication number
- CN106597192A CN106597192A CN201611027710.9A CN201611027710A CN106597192A CN 106597192 A CN106597192 A CN 106597192A CN 201611027710 A CN201611027710 A CN 201611027710A CN 106597192 A CN106597192 A CN 106597192A
- Authority
- CN
- China
- Prior art keywords
- transformer
- resistance device
- grounding resistance
- transformator
- transformer grounding
- 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.)
- Pending
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Classifications
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
Abstract
The invention provides a transformer grounding resistance device and method for detecting the same. The transformer grounding resistance device includes a transformer (10), a grounding resistance box (20), a current transformer, a flexible cable (30) which includes a copper wire arranged in the center, an outer sheath arranged at the outmost layer and a metal shielding layer arranged between the copper wire and the outer sheath, and a lead whose first end is in line connection with the metal shielding layer and whose second end penetrates through the current transformer. The first end of the flexible cable (30) is connected with the transformer (10), and the second end of the flexible cable (30) is connected with the grounding resistance box (20). The technical scheme of the invention effectively solves the problem of electrified detection of a transformer in the prior art.
Description
Technical field
The present invention relates to the technical field of transformer grounding, in particular to a kind of transformer grounding resistance device and
The detection method of transformer grounding resistance device.
Background technology
As shown in figure 1, when singlephase earth fault occurs in power system, grounding transformer makes electrical network form artificial neutral point
For system earth (such as Jing grounding through arc), there is provided a, perception of opposite in phase close with ground connection capacity current size
Current compensation capacity current, it is to avoid the generation of earth point electric arc and its caused harm.
However, some transformators there occurs that 10kV dry types ground connection becomes failure.Have to explore dry type ground connection change running status
The detection meanss of effect, by labs, ground connection becomes the test of live detection validation verification, is utilized respectively different inspections
Method is grounded on the different parts for becoming in dry type and carries out partial discharge detection experiment, to seek optimum detection method.
As shown in figure 1, in prior art, adopting between neutral point and earth resistance case 2 in grounding transformer 1 (ground connection becomes)
The mode of the connection of busbar 3.When grounding transformer 1 goes wrong, only by the power-off of grounding transformer 1 again to grounding transformer 1
Detected, so user can be brought inconvenience.Therefore, the detection of grounding transformer is detected without effective in prior art
Means.
The content of the invention
Present invention is primarily targeted at providing a kind of transformer grounding resistance device and transformer grounding resistance device
Detection method, to solve the problems, such as transformer belt electro-detection of the prior art.
To achieve these goals, according to an aspect of the invention, there is provided a kind of transformer grounding resistance device, bag
Include：Transformator；Earth resistance case；Current transformer；Flexible cable, flexible cable includes centrally disposed copper cash, is arranged on
Outermost oversheath and the metal screen layer being arranged between copper cash and oversheath, the first end and transformator of flexible cable
It is connected, the second end of flexible cable is connected with earth resistance case；Lead, first end and the metallic shield layer line of lead connect
Connect, the second end of lead passes through current transformer.
Further, transformer grounding resistance device also includes insulation booth, and current transformer is arranged in insulation booth, lead
The inside of insulation booth is penetrated from the outside of insulation booth.
Further, flexible cable also includes interior semi-conductive layer, insulating barrier, outer semiconducting layer and oversheath, and copper cash is arranged
At center, interior semi-conductive layer is arranged on the outer circumferential of copper cash, and insulating barrier is arranged on the outer circumferential of interior semi-conductive layer, partly leads outward
Electric layer is arranged on the outer circumferential of insulating barrier, and metal screen layer is arranged on the outer circumferential of outer semiconducting layer, and oversheath is arranged on
The outer circumferential of metal screen layer.
Further, lead includes metal wire and insulation sheath, and insulation sheath is arranged on the outer circumferential of metal wire.
Further, transformer grounding resistance device also includes supporting construction, and flexible cable is arranged on the support structure.
Further, it is made up of insulant the position that supporting construction contacts with flexible cable.
According to a further aspect in the invention, there is provided a kind of detection method of transformer grounding resistance device, using above-mentioned
Transformer grounding resistance device, its step includes：S10：Lead passes through current transformer；S20：The signal of telecommunication of current transformer
Test chart；S30：Judge whether transformator damages according to signal of telecommunication test chart.
Further, in step s 30：When the absolute value of signal of telecommunication test chart is less than or equal to 2V, judge transformator not
Damage；When the absolute value of signal of telecommunication test chart is more than 2V, transformer damage is judged.
Further, when transformer damage is judged, the transformator to damaging is changed or keeped in repair.
Further, also included being powered to transformator before step S10.
Using technical scheme, when need whether to damage transformator judge when, it is mutual by observing electric current
The signal of telecommunication of sensor detection is realizing judging whether transformator damages.Said structure causes transformator in powered situation
Under also can be detected, so greatly facilitated the use of user.Technical scheme efficiently solves existing skill
The problem of the transformer belt electro-detection in art.
Description of the drawings
The Figure of description for constituting the part of the application is used for providing a further understanding of the present invention, and the present invention's shows
Meaning property embodiment and its illustrated for explaining the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 shows the connection diagram of the transformer grounding resistance device of prior art；
Fig. 2 shows the connection diagram of the embodiment of transformer grounding resistance device of the invention.
Wherein, above-mentioned accompanying drawing includes the following drawings labelling：
1st, grounding transformer；2nd, earth resistance case；3rd, busbar；10th, transformator；20th, earth resistance case；30th, flexible cable.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Below with reference to the accompanying drawings and in conjunction with the embodiments describing the present invention in detail.
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
For the ease of description, space relative terms can be used here, such as " ... on ", " ... top ",
" in ... upper surface ", " above " etc., for describing such as a device or feature shown in the figure and other devices or spy
The spatial relation levied.It should be appreciated that space relative terms are intended to comprising the orientation except device described in figure
Outside different azimuth in use or operation.For example, if the device in accompanying drawing is squeezed, it is described as " in other devices
To be positioned as " under other devices or construction after the device of part or construction top " or " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " can include " ... top " and
" in ... lower section " two kinds of orientation.The device can also other different modes positioning (being rotated by 90 ° or in other orientation), and
And respective explanations are made to the relative description in space used herein above.
Now, it is more fully described with reference to the accompanying drawings according to an illustrative embodiment of the invention.However, these are exemplary
Embodiment can be implemented by many different forms, and should not be construed to be limited solely to embodiment party set forth herein
Formula.It should be appreciated that thesing embodiments are provided so that disclosure of the invention is thoroughly and complete, and these are shown
The design of example property embodiment is fully conveyed to those of ordinary skill in the art, in the accompanying drawings, for the sake of clarity, expands layer
With the thickness in region, and make to be presented with like reference characters identical device, thus description of them will be omitted.
As shown in Fig. 2 the transformer grounding resistance device of the present embodiment includes：Transformator 10, earth resistance case 20, electric current
Transformer, flexible cable 30 and lead.Flexible cable 30 include centrally disposed copper cash, be arranged on outermost oversheath with
And the metal screen layer being arranged between copper cash and oversheath, the first end of flexible cable 30 is connected with transformator 10, flexible
Second end of cable 30 is connected with earth resistance case 20.The first end of lead is connected with metallic shield layer line, and the second of lead
End is through current transformer.
Using the technical scheme of the present embodiment, when need whether to damage transformator judge when, by observing electric current
The signal of telecommunication of transformer detection is realizing judging whether transformator damages.Said structure causes transformator in powered feelings
Can also be detected under condition, so greatly facilitated the use of user.The technical scheme of the present embodiment efficiently solves existing
There is the problem of the transformer belt electro-detection in technology.
As shown in Fig. 2 in the technical scheme of the present embodiment, transformer grounding resistance device also includes insulation booth, electric current
Transformer is arranged in insulation booth, and lead penetrates the inside of insulation booth from the outside of insulation booth.The setting of insulation booth causes electric current
Transformer will not be subject to external interference when the signal of telecommunication of lead is detected, the signal of the lead for so measuring is more accurate.At this
In the technical scheme of embodiment, metal screen layer is Copper Foil.
As shown in Fig. 2 in the technical scheme of the present embodiment, flexible cable 30 also includes interior semi-conductive layer, insulating barrier, outer
Semi-conductive layer and oversheath, copper cash is centrally disposed, and interior semi-conductive layer is arranged on the outer circumferential of copper cash, and insulating barrier is arranged on interior
The outer circumferential of semi-conductive layer, outer semiconducting layer is arranged on the outer circumferential of insulating barrier, and metal screen layer is arranged in outer semiconductive
The outer circumferential of layer, oversheath is arranged on the outer circumferential of metal screen layer.It is preferable that said structure causes flexible cable 30 to have
Shielding action.
As shown in Fig. 2 in the technical scheme of the present embodiment, lead includes metal wire and insulation sheath, insulation sheath sets
Put in the outer circumferential of metal wire.Metal wire can be for aluminum steel, copper cash, silver wire etc., preferably copper cash in the present embodiment, at this
In the technical scheme of embodiment, lead is thinner wire.
As shown in Fig. 2 in the technical scheme of the present embodiment, transformer grounding resistance device also includes supporting construction, soft
Property cable 30 is arranged on the support structure.Said structure enables flexible cable 30 according to predetermined position is arranged on, so
Ensure that the Electrical Safety of flexible cable 30, i.e. flexible cable 30 are arranged on safer position.
As shown in Fig. 2 in the technical scheme of the present embodiment, the position that supporting construction contacts with flexible cable 30 is by exhausted
Edge material is made.Even if said structure ensure that the situation that electric leakage occurs in flexible cable 30 also will not be caused to personnel or equipment
Injury.
Present invention also provides a kind of detection method of transformer grounding resistance device, using above-mentioned transformer grounding electricity
Resistance device, its step includes：S10：Lead passes through current transformer.S20：The signal of telecommunication test chart of current transformer.S30：Root
Judge whether transformator 10 damages according to signal of telecommunication test chart.Above-mentioned detecting step realizes transformator 10 and can realize band electric-examination
Survey, the inconvenience that so will not be brought to user because of the power failure of transformator 10.
The detection method of the transformer grounding resistance device of the application, in step s 30：It is absolute when signal of telecommunication test chart
When value is less than or equal to 2V, judge that transformator 10 is not damaged.When the absolute value of signal of telecommunication test chart is more than 2V, transformator 10 is judged
Damage.Above-mentioned Comparison between detecting methods are simple and easy to do.
The detection method of the transformer grounding resistance device of the application, when judging that transformator 10 is damaged, the change to damaging
Depressor 10 is changed or keeped in repair.Specifically, when changing or keeping in repair transformator 10 damaged, first to the transformation of damage
The power-off of device 10, opens stand-by circuit, the electricity consumption of such without prejudice to user.
The detection method of the transformer grounding resistance device of the application, also included logical to transformator 10 before step S10
Electricity.Only transformator 10 has been powered and could detect to whether transformator 10 damages, and certainly, knows as those skilled in the art
Road, the powered situation of transformator 10 itself can omit the step.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
It should be noted that description and claims of this specification and the term " first " in above-mentioned accompanying drawing, "
Two " it is etc. the object for distinguishing similar, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so that embodiments of the present invention described herein for example can be with except here
Order beyond those of diagram or description is implemented.Additionally, term " comprising " and " having " and their any deformation, it is intended that
Be cover it is non-exclusive include, for example, contain process, method, system, product or the equipment of series of steps or unit not
Be necessarily limited to those steps or the unit clearly listed, but may include clearly not list or for these processes, side
Other intrinsic steps of method, product or equipment or unit.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of transformer grounding resistance device, it is characterised in that include：
Transformator (10)；
Earth resistance case (20)；
Current transformer；
Flexible cable (30), the flexible cable (30) including centrally disposed copper cash, be arranged on outermost oversheath with
And the metal screen layer being arranged between the copper cash and the oversheath, the first end of the flexible cable (30) and the change
Depressor (10) is connected, and the second end of the flexible cable (30) is connected with the earth resistance case (20)；
Lead, the first end of the lead is connected with the metallic shield layer line, and the second end of the lead passes through the electric current
Transformer.
2. transformer grounding resistance device according to claim 1, it is characterised in that the transformer grounding resistance device
Also include insulation booth, the current transformer is arranged in the insulation booth, and the lead is penetrated from the outside of the insulation booth
The inside of the insulation booth.
3. transformer grounding resistance device according to claim 1, it is characterised in that the flexible cable (30) also includes
Interior semi-conductive layer, insulating barrier, outer semiconducting layer and oversheath, the copper cash is centrally disposed, and the interior semi-conductive layer is arranged on
The outer circumferential of the copper cash, the insulating barrier is arranged on the outer circumferential of the interior semi-conductive layer, and the outer semiconducting layer sets
Put in the outer circumferential of the insulating barrier, the metal screen layer is arranged on the outer circumferential of the outer semiconducting layer, described outer
Sheath is arranged on the outer circumferential of the metal screen layer.
4. transformer grounding resistance device according to claim 1, it is characterised in that the lead includes metal wire and absolutely
Edge crust, the insulation sheath is arranged on the outer circumferential of the metal wire.
5. transformer grounding resistance device according to claim 1, it is characterised in that the transformer grounding resistance device
Also include supporting construction, the flexible cable (30) is arranged in the supporting construction.
6. transformer grounding resistance device according to claim 5, it is characterised in that the supporting construction and the flexibility
It is made up of insulant the position that cable (30) contacts.
7. a kind of detection method of transformer grounding resistance device, it is characterised in that usage right requires any one of 1 to 6 institute
The transformer grounding resistance device stated, its step includes：
S10：Lead passes through current transformer；
S20：The signal of telecommunication test chart of current transformer；
S30：Judge whether transformator (10) damages according to the signal of telecommunication test chart.
8. the detection method of transformer grounding resistance device according to claim 7, it is characterised in that in step s 30：
When the absolute value of signal of telecommunication test chart is less than or equal to 2V, judge that the transformator (10) is not damaged；
When the absolute value of signal of telecommunication test chart is more than 2V, judge that the transformator (10) is damaged.
9. the detection method of transformer grounding resistance device according to claim 8, it is characterised in that when judging the change
When depressor (10) is damaged, the transformator (10) to damaging is changed or keeped in repair.
10. the detection method of transformer grounding resistance device according to claim 6, it is characterised in that step S10 it
It is front also to include being powered to the transformator (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611027710.9A CN106597192A (en) | 2016-11-21 | 2016-11-21 | Transformer grounding resistance device and method for detecting the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611027710.9A CN106597192A (en) | 2016-11-21 | 2016-11-21 | Transformer grounding resistance device and method for detecting the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106597192A true CN106597192A (en) | 2017-04-26 |
Family
ID=58592426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611027710.9A Pending CN106597192A (en) | 2016-11-21 | 2016-11-21 | Transformer grounding resistance device and method for detecting the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106597192A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044854A (en) * | 2019-12-11 | 2020-04-21 | 国网北京市电力公司 | Partial discharge detection method and device for dry-type equipment and electronic equipment |
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| CN111044854A (en) * | 2019-12-11 | 2020-04-21 | 国网北京市电力公司 | Partial discharge detection method and device for dry-type equipment and electronic equipment |
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Application publication date: 20170426 |