CN109521317A - Transformer core multipoint earth faults point detecting method and device - Google Patents
Transformer core multipoint earth faults point detecting method and device Download PDFInfo
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- CN109521317A CN109521317A CN201811511972.1A CN201811511972A CN109521317A CN 109521317 A CN109521317 A CN 109521317A CN 201811511972 A CN201811511972 A CN 201811511972A CN 109521317 A CN109521317 A CN 109521317A
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- lamination
- voltage
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- transformer
- transformer core
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- 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
Abstract
The present invention relates to transformer fault detection technique field, a kind of transformer core multipoint earth faults point detecting method and device are disclosed.The transformer core multipoint earth faults point detecting method includes: the DC voltage for applying default size to the both ends lamination in the minds of transformer fe；The point on the basis of the wherein side of lamination clamping web, it is ensured that the web is zero potential, detects the voltage of the relatively described selected end web at different core-lamination stacks；Wherein, the selected end web is the web clamped in core-lamination stack；According to the voltage of selected end web relatively described at other laminations, the corresponding lamination of Treatment for Grounding Fault of Transformer Core is determined.Above-mentioned transformer core multipoint earth faults point detecting method can be relatively easy to analyze and determine out the corresponding lamination of Treatment for Grounding Fault of Transformer Core.
Description
Technical field
The invention belongs to transformer fault detection technique fields more particularly to transformer core multipoint earth faults point to detect
Method and apparatus.
Background technique
Transformer core in operation, since iron core and its hardware are the location of in the electric field different, generates
Current potential it is also different, electric discharge phenomena will be generated when the current potential of two o'clock reaches certain numerical value.The result of electric discharge can make transformer
Oil decomposition or the damage of solid insulation, for the generation for avoiding this phenomenon, iron core and its metalwork must effective groundings.But if
Iron core occurs the Grounding of two o'clock or more, will form short-circuited conducting sleeve between different grounding points during ground connection, generates
Circulation.This electric current will lead to iron core hot-spot, and loss increases, and transformer oil decomposes, or even burns out iron core.Therefore iron core must
Some reliable grounds of palpus, forbid multipoint earthing.Once it was found that there are multipoint earth faults for iron core, it is necessary to find Abnormal Grounding point simultaneously
Solution is fallen.
The normal ground of iron core is to draw ground connection by casing by the copper strips between insertion lamination or be directly connected to folder
It realizes, and the current potential between lamination and lamination is then the equipotential realized by capacitive character connection.Cause transformer core multiple spot
The reason of ground connection, is likely to be in the operation of the transformer some metallic foreign bodies that fall off and is stuck in iron core oil duct；It could also be possible that becoming
Core-lamination stack is caused to loosen for the vibration of depressor in the process of running and that causes alters piece or fall piece, is formed in oil duct seam areas short
It connects to cause multipoint earth faults.Since a core-lamination stack quantity is few then thousands of how then tens of thousands of, once discovery multipoint earthing
Problem often not easy-to-search.
Summary of the invention
In view of this, the embodiment of the invention provides transformer core multipoint earth faults point detecting method and device, with
Solve the problems, such as transformer core multipoint earth faults not easy-to-search in the prior art.
First aspect of the embodiment of the present invention provides a kind of transformer core multipoint earth faults point detecting method, comprising:
Apply the DC voltage of default size to the both ends iron core in the minds of transformer fe；
The point on the basis of selected end web, detects the voltage of the relatively described selected end web of core-lamination stack；Wherein, the choosing
Fixed end is the one of web for clamping iron core；
According to the voltage of the relatively described selected end web of core-lamination stack, determine that Treatment for Grounding Fault of Transformer Core is corresponding folded
Piece.
Optionally, the both ends lamination in the minds of transformer fe applies the DC voltage of default size, comprising:
The both ends of the both ends lamination access DC source in the minds of transformer fe are realized to the both ends lamination in the minds of transformer fe
Apply predetermined DC voltage.
Optionally, the voltage range of the DC source is 24V to 36V.
Optionally, the point on the basis of selected end web, detects the voltage of the relatively described selected end web of core-lamination stack,
Include:
The point on the basis of the iron core that the anode with the DC source is connect, detects the relatively described selected end iron at other iron cores
The voltage of the heart.
Optionally, if the voltage of the relatively described selected end iron heart is less than or equal to predeterminated voltage at other iron cores, determine
The lamination is Treatment for Grounding Fault of Transformer Core lamination.
Optionally, the predeterminated voltage is 0V to 0.1V.
Optionally, the predeterminated voltage is 0V.
Optionally, the voltage of the relatively described selected end web of iron core different location lamination is detected by D.C. voltmeter.
Second aspect of the embodiment of the present invention provides a kind of transformer core multipoint earth faults point detection device, comprising:
DC source, positive and negative both ends are electrically connected with the both ends lamination in the minds of transformer fe respectively, for applying for transformer core
Add the DC voltage of default size；
Voltage check device, one end are connect with selected end web, and the other end is connect with core-lamination stack, folded for detecting iron core
The voltage of the relatively described selected end web of piece；Wherein, the selected end is the one of web for clamping iron core.
Optionally, the voltage check device is D.C. voltmeter.
Existing beneficial effect is the embodiment of the present invention compared with prior art: the embodiment of the present invention, transformer core
Core is the magnetic conductive loop as made of many different sizes and lamination (such as silicon steel sheet) stack of shape, in transformer fe hearty cord
In structure, core-lamination stack is made of the slice of different in width, and insulating layer is equipped between each lamination, thus core-lamination stack just as
Multiple capacitance electrodes are cascaded, and since core-lamination stack is very thin, and the contact area between lamination and lamination is very big, right
It for alternating voltage, is applied on different laminations and is equivalent to access, but DC power supply is applied between different laminations then closely
Like capacitor charging is given, the embodiment of the present invention can generate the original of different current potentials using Constant Direct Current source between different laminations
Reason, is applied between two final stage laminations of iron core by DC source, then with the selected end web of voltage check device measurement and not
With the voltage between lamination, and then can be relatively easy to analyze and determine out the corresponding lamination of Treatment for Grounding Fault of Transformer Core.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the course of work signal of transformer core multipoint earth faults point detection device provided in an embodiment of the present invention
Figure；
Fig. 2 is the flow chart of transformer core multipoint earth faults point detecting method provided in an embodiment of the present invention.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Transformer core multipoint earth faults point detection device in the embodiment of the present invention may include DC source and voltage
Detection device；The positive and negative both ends of DC source are electrically connected with the both ends lamination in the minds of transformer fe respectively, for being transformer core
Apply the DC voltage of default size；One end of voltage check device is connect with selected end web, voltage check device it is another
End is connect with core-lamination stack, and voltage check device is used to detect the electricity of the relatively described selected end web of iron core different location lamination
Pressure；Wherein, the selected end is the one of web for clamping iron core.
Wherein, the core of transformer core is formed by lamination (such as silicon steel sheet) stack of many different sizes and shape
Magnetic conductive loop, in transformer iron core structure, core-lamination stack is made of the slice of different in width, and is all provided between each lamination
There is an insulating layer, therefore core-lamination stack is cascaded just as multiple capacitance electrodes, since core-lamination stack is very thin, and lamination and folded
Contact area between piece is but very big, for alternating voltage, is applied on different laminations and is equivalent to access, but direct current
Source is applied between different laminations then approximation can be in different laminations using Constant Direct Current source to capacitor charging, the embodiment of the present invention
Between generate the principle of different current potentials, be applied between two final stage laminations of iron core by DC source, then use voltage detecting
Device measures the voltage between selected endlap piece and different laminations, and then can be relatively easy to analyze and determine that transformer core connects
The corresponding lamination of earth fault.
Fig. 1 shows the course of work of transformer core multipoint earth faults point detection device provided in an embodiment of the present invention
Schematic diagram is referring to Fig.1 below further described the transformer core multipoint earth faults point detection device.
Referring to Fig. 1, in the present embodiment, the positive and negative both ends of DC source 10 are electrically connected with the both ends lamination in the minds of transformer fe respectively
It connects, for applying the DC voltage of default size for transformer core.In the present embodiment, voltage check device uses DC voltage
Table 20, but not limited to this.One end of D.C. voltmeter 20 is connect with selected end web, and the other end is connect with core-lamination stack, is used
In the voltage of the detection relatively described selected end web of different location lamination.In transformer core 100, core-lamination stack is by different width
The slice of degree forms, and core-lamination stack two sides are respectively equipped with clamp insulation 200, during core-lamination stack is clipped in by two clamp insulations 200
Between；In addition, two 200 both sides externals of clamp insulation are additionally provided with two fastening webs 300.Two fastening webs 300 clampings are simultaneously solid
Fixed core lamination.One of fastening web 300 is grounded, and the fastening web 300 on right side is grounded in Fig. 2, i.e. shown in A.It is selected
End web be two fastening webs 300 one of them.
Specifically, the two poles of the earth of DC source 10 are connect respectively on the both ends lamination of iron core, to guarantee that voltage resolution is higher
Ensure safety simultaneously, the output voltage range of DC source 10 is located at 24V between 36V, and the output voltage of such DC source 10 will
Approaches uniformity is distributed on core-lamination stack.
After applying voltage to transformer core by DC source 10, the D.C. voltmeter 20 of suitable range is chosen, it will
Wherein test pencil 1 is connected on fastening web 300 D.C. voltmeter 20, and test pencil 2 is on core-lamination stack perpendicular to the side of core-lamination stack
To continuous measurement, due to partial pressure effect of the DC source 10 on core-lamination stack, test pencil position 2. when, between test pencil 1 and test pencil 2
There is voltage, when 1. test pencil 2 is moved to position, due to having problem with grounding at this level-one lamination of iron core B, this position
Current potential be zero, D.C. voltmeter 20 is shown as zero.It can be relatively easy to find out transformer core by this method
The lamination of ground fault further analyzes the reason of failure is formed further according to the position of lamination.
Based on same inventive concept, the embodiment of the present invention also provides a kind of transformer core multipoint earth faults point detection
Method is below illustrated the transformer core multipoint earth faults point detecting method.
Referring to fig. 2, in one embodiment, the transformer core multipoint earth faults point detecting method the following steps are included:
Step 100, apply the DC voltage of default size to the both ends lamination in the minds of transformer fe.
In one embodiment, step 100 realizes that process can be with are as follows: the both ends lamination in the minds of transformer fe is accessed DC source
Both ends, realize in the minds of transformer fe both ends lamination apply predetermined DC voltage.That is, being transformer core by DC source
DC voltage is provided, the both ends lamination in the minds of Lai Shixian transformer fe applies the DC voltage of default size.The above is only one kind
Implementation can also be realized by other means and apply in advance to the both ends lamination in the minds of transformer fe in other embodiments
If the DC voltage of size.
Wherein, the voltage range of the DC source can be 24V to 36V.DC source positive and negative polarities are connect respectively in transformation
On the both ends lamination of device iron core, to guarantee that voltage resolution is higher while ensuring safety, the voltage range of DC source can be 24V
To 36V, the output voltage of such DC source approaches uniformity will be distributed on core-lamination stack.
Step 200, the point on the basis of selected endlap piece, detects the voltage of the relatively described selected endlap piece at other laminations；
Wherein, the selected endlap piece is a lamination in the lamination of both ends.
In one embodiment, the realization process of step 200 can be with are as follows: is with the lamination connecting with the anode of the DC source
Datum mark, and by its effective grounding, detect the voltage of the relatively described selected endlap piece at other laminations.
Step 300, according to the voltage of selected endlap piece relatively described at other laminations, determine Treatment for Grounding Fault of Transformer Core
Corresponding lamination.
Wherein, if the voltage of the relatively described selected endlap piece is less than or equal to predeterminated voltage at other laminations, determining should
Lamination is between transformer grounding failure lamination and positive pole connection lamination.Illustratively, the predeterminated voltage size can be with
For 0V to 0.1V.More specifically, the predeterminated voltage can be 0V.That is, if the relatively described selected endlap piece at other laminations
Voltage is equal to 0V, then moves the measurement end of voltmeter, until voltage starts to change, then, voltage starts this lamination of variation
It is exactly transformer grounding failure lamination.
It should be understood that the core of transformer core is folded by many different sizes and the lamination (such as silicon steel sheet) of shape
Magnetic conductive loop made of product, in transformer iron core structure, core-lamination stack is made of the slice of different in width, and each lamination it
Between be equipped with insulating layer, therefore core-lamination stack is cascaded just as multiple capacitance electrodes, since core-lamination stack is very thin, and folds
Contact area between piece and lamination is but very big, for alternating voltage, is applied on different laminations and is equivalent to access, but
DC power supply is applied between different laminations then approximation can be not using Constant Direct Current source to capacitor charging, the embodiment of the present invention
With the principle for generating different current potentials between lamination, it is applied between two final stage laminations of iron core by DC source, then electricity consumption
It presses detection device to measure the voltage between selected endlap piece and different laminations, and then can be relatively easy to analyze and determine transformer
The corresponding lamination of iron core grounding failure.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of transformer core multipoint earth faults point detecting method characterized by comprising
Apply the DC voltage of default size to the both ends lamination in the minds of transformer fe；
The point on the basis of selected end web, detects the voltage of the relatively described selected end web at core-lamination stack；Wherein, described selected
End web is the one of web for clamping core-lamination stack；
According to the voltage of the relatively described selected end web at test lamination, the corresponding lamination of Treatment for Grounding Fault of Transformer Core is determined.
2. transformer core multipoint earth faults point detecting method as described in claim 1, which is characterized in that described to transformation
Both ends lamination in device iron core applies the DC voltage of default size, comprising:
By the both ends of the both ends lamination access DC source in the minds of transformer fe, realizes and the both ends lamination in the minds of transformer fe is applied
Predetermined DC voltage.
3. transformer core multipoint earth faults point detecting method as claimed in claim 2, which is characterized in that the DC source
Voltage range be 24V to 36V.
4. transformer core multipoint earth faults point detecting method as claimed in claim 2, which is characterized in that described with selected
Point on the basis of end web detects the voltage of the relatively described selected end web at core-lamination stack, comprising:
The point on the basis of the lamination that the anode with the DC source is connect, detects the relatively described selected endlap piece at other laminations
Voltage.
5. transformer core multipoint earth faults point detecting method as described in claim 1, which is characterized in that if it is folded to test certain
The voltage of the relatively described selected end web is less than or equal to predeterminated voltage at piece, then determines that the lamination is folded for transformer grounding failure
Piece.
6. transformer core multipoint earth faults point detecting method as claimed in claim 5, which is characterized in that the default electricity
Pressure is 0V to 0.1V.
7. transformer core multipoint earth faults point detecting method as claimed in claim 6, which is characterized in that the default electricity
Pressure is 0V.
8. transformer core multipoint earth faults point detecting method as described in any one of claim 1 to 7, which is characterized in that
The voltage of the relatively described selected end web at different core-lamination stacks is detected by D.C. voltmeter.
9. a kind of transformer core multipoint earth faults point detection device characterized by comprising
DC source, positive and negative both ends are electrically connected with the both ends lamination in the minds of transformer fe respectively, pre- for applying for transformer core
If the DC voltage of size；
Voltage check device, one end are connect with selected end web, and the other end with core-lamination stack for connecting, for detecting different iron
The voltage of the relatively described selected end web at heart lamination；Wherein, the selected end web is the one of abdomen in core-lamination stack two sides
Plate.
10. transformer core multipoint earth faults point detection device as claimed in claim 9, which is characterized in that the voltage
Detection device is D.C. voltmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811511972.1A CN109521317A (en) | 2018-12-11 | 2018-12-11 | Transformer core multipoint earth faults point detecting method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811511972.1A CN109521317A (en) | 2018-12-11 | 2018-12-11 | Transformer core multipoint earth faults point detecting method and device |
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| CN109521317A true CN109521317A (en) | 2019-03-26 |
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| CN201811511972.1A Pending CN109521317A (en) | 2018-12-11 | 2018-12-11 | Transformer core multipoint earth faults point detecting method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110275056A (en) * | 2019-07-31 | 2019-09-24 | 西南交通大学 | A kind of rewinding material multipoint earth faults current calculation method considering the classification of silicon steel sheet cross-sectional width |
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Application publication date: 20190326 |