CN107450037A - A kind of transformer iron core excitation characteristic measuring device and its measurement frock - Google Patents
A kind of transformer iron core excitation characteristic measuring device and its measurement frock Download PDFInfo
- Publication number
- CN107450037A CN107450037A CN201710510525.3A CN201710510525A CN107450037A CN 107450037 A CN107450037 A CN 107450037A CN 201710510525 A CN201710510525 A CN 201710510525A CN 107450037 A CN107450037 A CN 107450037A
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- iron core
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- 238000005259 measurement Methods 0.000 title claims abstract description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 230000005284 excitation Effects 0.000 title claims abstract description 36
- 238000004804 winding Methods 0.000 claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1253—Measuring galvano-magnetic properties
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of transformer iron core excitation characteristic measuring device and its measurement frock, measuring circuit connection corresponding with measurement frock, measurement frock includes plug connector, plug connector includes N number of plug-in unit, N >=2, each plug-in unit is formed by a male and for the female of the male grafting with belonging to same plug-in unit, the male of each plug-in unit connects with being not belonging to a female of same plug-in unit by the way that connection line is corresponding, to realize when by the male of each plug-in unit and female grafting, all connection lines can form the multicircuit winding being sequentially connected.When being measured to tested iron core, need to only each male measured in frock and corresponding female be plugged in together and can be realized as measuring, by the frock just without the artificial winding multiturn Exciting Windings for Transverse Differential Protection when measuring iron core every time, significantly reduce the cumbersome degree of measurement process, and error rate, reduce unnecessary time.
Description
Technical field
The present invention relates to a kind of transformer iron core excitation characteristic measuring device and its measurement frock, belong to transformer iron core and encourage
Magnetic characteristic field of measuring technique.
Background technology
Field performance is an important parameter of voltage transformer iron-core mass quality, and Fig. 1 is conventional field performance inspection
Slowdown monitoring circuit, including pressure regulator TV, mean voltage Table V and ammeter A, it is tested transformer TtIron core be connected on S1 on circuit and
S2 both ends, to be detected.If detection object is whole transformer, then, tested transformer need to only be connect on the line
.But if necessary to when individually being detected to the field performance unshakable in one's determination in transformer, it is necessary on iron core by hand
Multiturn Exciting Windings for Transverse Differential Protection is wound, measurement is then equipped with and is measured with device.But, it is generally the case that individually iron core is entered every time
During row measurement, it is intended to measure the connection of circuit, also, be required to artificial winding multiturn Exciting Windings for Transverse Differential Protection, process on iron core
It is cumbersome, it is easy to malfunction, it is time-consuming and laborious, moreover, different iron core it is also possible to need to wind the Exciting Windings for Transverse Differential Protection of the different numbers of turn, enters
One step adds the cumbersome degree and error rate of process.
The content of the invention
It is an object of the invention to provide a kind of transformer iron core excitation feature measurement frock, to solve every time to enter iron core
It is required to during row measurement the artificial winding multiturn Exciting Windings for Transverse Differential Protection on iron core the problem of.It is unshakable in one's determination present invention simultaneously provides a kind of transformer
Excitation property measurement apparatus.
To achieve the above object, the solution of the present invention includes a kind of transformer iron core excitation feature measurement frock, including inserts
Fitting, the plug connector include N number of plug-in unit, and N >=2, each plug-in unit is by a male and for belonging to same
The female of the male grafting of plug-in unit is formed, the male of each plug-in unit and a female for being not belonging to same plug-in unit
Connected by the way that connection line is corresponding, to realize when by the male of each plug-in unit and female grafting, all connection line energy
Enough form the multicircuit winding being sequentially connected.
The male for realizing each plug-in unit passes through connection line with a female for being not belonging to same plug-in unit
Corresponding to the means connected is：Each plug-in unit is arranged in order, the male in i-th of plug-in unit and i+1 plug-in unit
In female connected by connection line, i=1,2 ..., N, male or female and n-th in the 1st plug-in unit
Male or female in plug-in unit are the interface for being used to connect measuring circuit for measuring frock.
In other plug-in units in non-1st plug-in unit and n-th plug-in unit, at least one plug-in unit is drawn
There is a tap, the tap is drawn from the male in corresponding plug-in unit or female, by the male and female of each plug-in unit
During grafting, the tap forms the number of turn selection port of the measurement frock.
Each connection line is copper core insulated wire, and all connection lines are encapsulated in a protecting pipe.
A kind of transformer iron core excitation characteristic measuring device, including measuring circuit, in addition to measurement frock, the measurement electricity
Road connection corresponding with measurement frock, the frock that measures include plug connector, and the plug connector includes N number of plug-in unit, N >=2, respectively
Plug-in unit is formed by a male and for the female of the male grafting with belonging to same plug-in unit, each plug-in unit
Male with being not belonging to a female of same plug-in unit by the corresponding connection of connection line, to realize by each grafting list
When the male of member and female grafting, all connection lines can form the multicircuit winding being sequentially connected.
The male for realizing each plug-in unit passes through connection line with a female for being not belonging to same plug-in unit
Corresponding to the means connected is：Each plug-in unit is arranged in order, the male in i-th of plug-in unit and i+1 plug-in unit
In female connected by connection line, i=1,2 ..., N, male or female and n-th in the 1st plug-in unit
Male or female in plug-in unit are the interface for being used to connect measuring circuit for measuring frock.
In other plug-in units in non-1st plug-in unit and n-th plug-in unit, at least one plug-in unit is drawn
There is a tap, the tap is drawn from the male in corresponding plug-in unit or female, by the male and female of each plug-in unit
During grafting, the tap forms the number of turn selection port of the measurement frock.
The measuring circuit connects with measurement frock by the way that single-pole double-throw switch (SPDT) is corresponding.
Each connection line is copper core insulated wire, and all connection lines are encapsulated in a protecting pipe.
The present invention provides a kind of transformer iron core excitation feature measurement frock, is provided with multiple plug-in units, each grafting
Unit is formed by a male and the female for plugging connection with corresponding male, male and mother in each plug-in unit
Head dislocation connection, i.e., the male of each plug-in unit and a female for being not belonging to same plug-in unit are corresponding by connection line
Connection, like this, if by the male in all plug-in units and supporting female grafting, each connection line is just
It is a circle winding, also, all connection lines will be sequentially connected, i.e., and all connection lines just constitute multicircuit winding,
The measurement frock is accessed in measuring circuit, the multicircuit winding for being then formed through tested iron core can be surveyed to the iron core
Amount.Therefore, when being measured to tested iron core, each male measured in frock and corresponding female need to be only plugged in together
Can be realized as measuring, by the frock just without every time to iron core measure when artificial winding multiturn Exciting Windings for Transverse Differential Protection, greatly
The cumbersome degree of measurement process, and error rate are reduced, reduces unnecessary time, lifts measurement efficiency, reduces labor
Fatigue resistance.
Brief description of the drawings
Fig. 1 is the measuring circuit figure of conventional iron core excitation performance；
Fig. 2 is a kind of measuring circuit figure of iron core excitation performance provided by the invention；
Fig. 3 is the structure principle chart of transformer iron core excitation feature measurement frock.
Embodiment
Transformer iron core excitation characteristic measuring device embodiment
The present embodiment provides a kind of transformer iron core excitation characteristic measuring device, can be to the iron core excitation of voltage transformer
Characteristic measures, it is equally possible that being measured to the iron core excitation characteristic of current transformer.In the present embodiment, object
It is voltage transformer, for example model is JDQX-66/110, JDQX-110/220, JDQXH-110/220, JSQXH-66/110
The iron core of voltage transformer.
As shown in Fig. 2 measurement apparatus generally comprises two parts, a part is measuring circuit part, and another part is to survey
Measure frock GZ (dotted box portion in figure).Wherein, measuring circuit part can also adopt in addition to the circuit structure shown in Fig. 2
With all existing measuring circuits as shown in Figure 1.Therefore, the inventive point of measurement apparatus and the circuit structure of measuring circuit is not lain in,
But it is the concrete structure for measuring frock.
Measurement frock mainly includes plug connector part, and plug connector part includes N number of plug-in unit, and N >=2, N number are with needing
The umber of turn wanted is related, because the number of turn of required winding in varied situations may be different, the number of corresponding plug-in unit
May be different, so, the number of turn of required winding can be set according to actual requirement, i.e. N number is set according to actual requirement.
The structure of each plug-in unit is identical, for any one plug-in unit, the plug-in unit by a male and
One female is formed, the male and the supporting setting of female, and both can realize plug connection, when needed, real by both grafting
The connection of existing male and female.Certainly, male and female are and represent two the mode of grafting can be utilized to be attached
Part, the male of each plug-in unit and the position of female can exchange, and respective annexation is also required to exchange.
It is attached as follows between plug-in unit：The male of each plug-in unit is not with belonging to same grafting list
The female of member is connected by connection line, but a female with being not belonging to same plug-in unit is corresponding by connection line
Connection, it is exactly like this, between all plug-in units dislocation connection, then, the male of each plug-in unit and female are inserted
When connecing, the male and female of each plug-in unit just constitute a point, and each connection line just forms a circle, i.e. a circle around
Group, also, due to being dislocation connection between plug-in unit, then, it will from beginning to end be sequentially connected, form between all windings
One continual line, i.e., all connection lines can just form the multicircuit winding that head and the tail are sequentially connected.
Because the number of plug-in unit is N number of, then, for convenience of description, these plug-in units are arranged in order, and according to
It is secondary be referred to as the 1st plug-in unit, the 2nd plug-in unit ..., i-th of plug-in unit ..., n-th plug-in unit, i=1,
2、……、N.Further, the mode of the dislocation connection between plug-in unit is specific as follows：Male in i-th of plug-in unit
It is connected with the female in i+1 plug-in unit by connection line, that is to say, that the male in some plug-in unit is with
One female is connected by connection line, is specially：Male in 1st plug-in unit and the female in the 2nd plug-in unit
Connected by connection line, the male in the 2nd plug-in unit is connected with the female in the 3rd plug-in unit by connection line
Connecing ... ..., the male in i-th of plug-in unit is connected with the female in i+1 plug-in unit by connection line ... ...,
Male in the N-1 plug-in unit is connected with the female in n-th plug-in unit by connection line.Like this, the 1st
Female in plug-in unit is isolated with the male in n-th plug-in unit, is not connected with other elements, so, can be with
Two interfaces by the two isolated elements as the measurement frock, for being connected with measuring circuit part.Certainly, due to same
The male and female for belonging to plug-in unit are plugged in together in measurement, then, can also be by the 1st plug-in unit
In male and n-th plug-in unit in female as measurement frock interface.In addition, the above-mentioned span for giving i,
1,2 ..., N, this is simply to illustrate that i value is integer, due to being related to i+1 in foregoing description, and N number of due to having
Plug-in unit, then, i maximums get N-1.
Also, the number of turn is related to the number of connection line, i.e., related to N：If the 1st plug-in unit and n-th grafting
If not having connection line between unit and the interface of corresponding extraction, total number of turn is equal to N-1；If the 1st plug-in unit or
If having connection line between n-th plug-in unit and the interface of corresponding extraction, the connection line also forms a circle winding, because
This, total number of turn is equal to N, and in the present embodiment, the female of n-th plug-in unit draws interface by a connection line, total
The number of turn is equal to N.
In addition, in above-mentioned, plug connector part is divided into N number of plug-in unit, and each plug-in unit is by a male and a mother
Head is formed, and as other embodiments, plug connector part can also generally comprise two plug-in units, and the two plug-in units are by N
Individual lock pin is formed, and a lock pin in one of plug-in unit can be plugged in together with a lock pin in another plug-in unit, and
And the lock pin in the two plug-in units corresponds, it can realize that two lock pins of grafting form a pair of lock pins, be inserted equivalent to one
Order member.That is, one of plug-in unit is the aggregate for being integrated and being formed by all males, another
Plug-in unit is another aggregate for being integrated and being formed by all females.The connected mode of lock pin in each plug-in unit with it is upper
The connected mode for stating male or female is identical.Like this, by the way that two plug-in units are plugged in together, realize between each pair of lock pin
Connection.
In the present embodiment, each connection line is copper core insulated wire, and all circuit packages are in a protecting pipe, institute
Some connection lines form a branch of copper core insulated wire.
Fig. 3 provides a kind of specific embodiment, there is 31 plug-in units, i.e. N=31.As shown in figure 3, plug-in unit 100 has
31 males (1,2,3 ... ..., 31), plug-in unit 200 have 31 females (1 ＇, 2 ＇, 3 ＇ ... ..., 31 ＇), and the order of connection is followed successively by
1-2 ＇, 2-3 ＇ ... ..., 30-31 ＇, i.e. male 1 are connected with the ＇ of female 2 by copper core insulated wire, one end welding of copper core insulated wire
Male 1, other end welding female 2 ＇；Male 2 is connected with the ＇ of female 3 by copper core insulated wire；……；Male 30 is led to the ＇ of female 31
Cross the connection of copper core insulated wire.Then d and f leads are drawn respectively from the ＇ of female 1 and male 31, connect as what is be connected with external circuitry
Mouthful.It can so realize and be formed as 31 circle windings between d-f end lines.In use, after test fixture is passed through iron core, male and mother
Head docking.
Further, since different iron cores is it is also possible to need the Exciting Windings for Transverse Differential Protection of the different numbers of turn, in order to meet a measurement work
Dress can export the Exciting Windings for Transverse Differential Protection of the different numbers of turn, avoid being required to change measurement frock when measuring different iron cores, survey
A tap can be drawn by having in amount frock at least one plug-in unit, to measure the number of turn selection port of frock.Certainly, if
The purpose for putting tap is to realize the Exciting Windings for Transverse Differential Protection for exporting the different numbers of turn, then, only middle plug-in unit can be set slotting
Head, that is, the plug-in unit for being provided with tap are non-1st plug-in unit and other plug-in units of n-th plug-in unit.When only
When having a plug-in unit to have tap, the Exciting Windings for Transverse Differential Protection of three kinds of different numbers of turn can be formed by the interface at tap and both ends；
When there is multiple plug-in units to have tap, by the way that many kinds can be formed between tap and between tap and the interface at both ends not
With the Exciting Windings for Transverse Differential Protection of the number of turn.Illustrated below so that a representative only plug-in unit draws tap as an example.Due to
What male and female were connected together in grafting, therefore, tap can be drawn from male, can also be by drawing in female
Go out.
As shown in figure 3, the ＇ of female 27 in the 27th plug-in unit draws tap e, thus tap e can with d ends or
F ends form the winding of the different numbers of turn, such as：It is 26 circles between d-e end lines, is 31 circles between d-f end lines.
In order to realize that the selection of the winding of two kinds of numbers of turn, tap e, d ends and f ends are cut by a single-pole double-throw switch (SPDT)
Change, selected by the gear of single-pole double-throw switch (SPDT), can change and measure the connecting mode of frock, as shown in Fig. 2 according to actual feelings
The different numbers of turn can be selected in condition, for measuring different excitation properties unshakable in one's determination.
As shown in Fig. 2 measuring circuit part includes：Air switch QA, power supply indicator HL, pressure regulator T, ammeter PA,
Power meter PW, effective voltmeter PV1, mean voltmeter PV2 and single-pole double-throw switch (SPDT) S.Pressure regulator T input is connected with
Air switch QA and power supply indicator HL, pressure regulator T output end connect excitation property measuring loop, there is ammeter PA, power meter
PW, effective voltmeter PV1 and mean voltmeter PV2 etc..
The operation principle of measuring circuit is：Each device is organically combined, measurement frock GZ is encircled in tested iron
In the heart, be tested it is unshakable in one's determination (such as：Cuboid is unshakable in one's determination or ellipse is unshakable in one's determination) through measurement frock, male and female docking, dial
Dynamic single-pole double-throw switch (SPDT) S, beats the position of the excitation number of turn required for tested iron core, then closes air switch QA, power supply indicator
It is bright, pressure regulator is adjusted manually, you can is read each meter reading, is realized the purpose of measurement voltage iron core excitation performance.Specially：When
It is tested unshakable in one's determination when needing 31 circle Exciting Windings for Transverse Differential Protection, single-pole double-throw switch (SPDT) is beaten to " b " position, then with " f " of excitation characteristic test frock
Termination is logical, closes air switch QA afterwards, power supply indicator HL is bright, then adjusts pressure regulator T, you can is read under given voltage
Current value and loss value, it is achieved thereby that the test of voltage transformer iron core excitation performance.When 26 circle excitations of tested needs unshakable in one's determination
During winding, single-pole double-throw switch (SPDT) need to be only beaten to " c " position, so make use of 26 circle windings of excitation property measurement frock,
Other operating procedures are constant.And belong to routine techniques for the specific data handling procedure of excitation property, it is just no longer specific here
Explanation.
Transformer iron core excitation feature measurement frock embodiment
The present embodiment provides a kind of transformer iron core excitation feature measurement frock, and the measurement frock can be with separately fabricated and go out
Sell, there is separately protected value, due to being explained to the measurement frock in above-mentioned measurement apparatus, this reality
Example is applied just to repeat no more.
Claims (9)
1. a kind of transformer iron core excitation feature measurement frock, it is characterised in that including plug connector, the plug connector includes N number of
Plug-in unit, N >=2, mother of each plug-in unit by a male and for the male grafting with belonging to same plug-in unit
Head is formed, and the male of each plug-in unit connects with being not belonging to a female of same plug-in unit by the way that connection line is corresponding,
To realize when by the male of each plug-in unit and female grafting, all connection lines can form the multiturn that is sequentially connected around
Group.
2. transformer iron core excitation feature measurement frock according to claim 1, it is characterised in that realize each grafting
The male of unit is by the means of the corresponding connection of connection line with being not belonging to a female of same plug-in unit：Inserted each
Order member is arranged in order, and the male in i-th of plug-in unit is connected with the female in i+1 plug-in unit by connection line
Connect, i=1,2 ..., N, male or female and male or female in n-th plug-in unit in the 1st plug-in unit
For the interface for being used to connect measuring circuit of the measurement frock.
3. transformer iron core excitation feature measurement frock according to claim 2, it is characterised in that non-1st grafting list
In other plug-in units in member and n-th plug-in unit, at least one plug-in unit leads to tap, and the tap is from correspondingly
Male or female in plug-in unit are drawn, and when by the male of each plug-in unit and female grafting, the tap forms institute
State the number of turn selection port of measurement frock.
4. transformer iron core excitation feature measurement frock according to claim 1, it is characterised in that each connection line is
Copper core insulated wire, and all connection lines are encapsulated in a protecting pipe.
5. a kind of transformer iron core excitation characteristic measuring device, including measuring circuit, it is characterised in that also include measurement frock,
Measuring circuit connection corresponding with measurement frock, the measurement frock include plug connector, and the plug connector includes N number of grafting list
Member, N >=2, each plug-in unit are formed by a male and for the female of the male grafting with belonging to same plug-in unit,
The male of each plug-in unit connects with being not belonging to a female of same plug-in unit by the way that connection line is corresponding, is existed with realizing
During by the male of each plug-in unit and female grafting, all connection lines can form the multicircuit winding being sequentially connected.
6. transformer iron core excitation characteristic measuring device according to claim 5, it is characterised in that realize each grafting
The male of unit is by the means of the corresponding connection of connection line with being not belonging to a female of same plug-in unit：Inserted each
Order member is arranged in order, and the male in i-th of plug-in unit is connected with the female in i+1 plug-in unit by connection line
Connect, i=1,2 ..., N, male or female and male or female in n-th plug-in unit in the 1st plug-in unit
For the interface for being used to connect measuring circuit of the measurement frock.
7. transformer iron core excitation characteristic measuring device according to claim 6, it is characterised in that non-1st grafting list
In other plug-in units in member and n-th plug-in unit, at least one plug-in unit leads to tap, and the tap is from correspondingly
Male or female in plug-in unit are drawn, and when by the male of each plug-in unit and female grafting, the tap forms institute
State the number of turn selection port of measurement frock.
8. transformer iron core excitation characteristic measuring device according to claim 7, it is characterised in that the measuring circuit with
Frock is measured to connect by the way that single-pole double-throw switch (SPDT) is corresponding.
9. transformer iron core excitation characteristic measuring device according to claim 5, it is characterised in that each connection line is
Copper core insulated wire, and all connection lines are encapsulated in a protecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710510525.3A CN107450037A (en) | 2017-06-28 | 2017-06-28 | A kind of transformer iron core excitation characteristic measuring device and its measurement frock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710510525.3A CN107450037A (en) | 2017-06-28 | 2017-06-28 | A kind of transformer iron core excitation characteristic measuring device and its measurement frock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107450037A true CN107450037A (en) | 2017-12-08 |
Family
ID=60488398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710510525.3A Pending CN107450037A (en) | 2017-06-28 | 2017-06-28 | A kind of transformer iron core excitation characteristic measuring device and its measurement frock |
Country Status (1)
| Country | Link |
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| CN (1) | CN107450037A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201654218U (en) * | 2010-01-29 | 2010-11-24 | 平高集团有限公司 | Multifunctional testing stand of voltage transformer |
| CN102721884A (en) * | 2012-06-21 | 2012-10-10 | 平高集团有限公司 | Testing apparatus for excitation characteristics of iron cores of mutual inductors and winding structure using testing apparatus |
| CN103426868A (en) * | 2012-05-18 | 2013-12-04 | 深南电路有限公司 | Packaging structure and packaging method thereof |
| CN104237835A (en) * | 2014-09-03 | 2014-12-24 | 中国南方电网有限责任公司超高压输电公司梧州局 | Wiring detection device for straight-through current transformer |
| CN105006351A (en) * | 2015-07-15 | 2015-10-28 | 宁波仁栋电气有限公司 | Transformer iron core and manufacture method thereof |
-
2017
- 2017-06-28 CN CN201710510525.3A patent/CN107450037A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201654218U (en) * | 2010-01-29 | 2010-11-24 | 平高集团有限公司 | Multifunctional testing stand of voltage transformer |
| CN103426868A (en) * | 2012-05-18 | 2013-12-04 | 深南电路有限公司 | Packaging structure and packaging method thereof |
| CN102721884A (en) * | 2012-06-21 | 2012-10-10 | 平高集团有限公司 | Testing apparatus for excitation characteristics of iron cores of mutual inductors and winding structure using testing apparatus |
| CN104237835A (en) * | 2014-09-03 | 2014-12-24 | 中国南方电网有限责任公司超高压输电公司梧州局 | Wiring detection device for straight-through current transformer |
| CN105006351A (en) * | 2015-07-15 | 2015-10-28 | 宁波仁栋电气有限公司 | Transformer iron core and manufacture method thereof |
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Application publication date: 20171208 |
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| RJ01 | Rejection of invention patent application after publication |