CN2353025Y - Large current mutual inductor - Google Patents
Large current mutual inductor Download PDFInfo
- Publication number
- CN2353025Y CN2353025Y CN 98217419 CN98217419U CN2353025Y CN 2353025 Y CN2353025 Y CN 2353025Y CN 98217419 CN98217419 CN 98217419 CN 98217419 U CN98217419 U CN 98217419U CN 2353025 Y CN2353025 Y CN 2353025Y
- Authority
- CN
- China
- Prior art keywords
- mutual inductor
- current mutual
- iron core
- iron cores
- current
- 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.)
- Expired - Fee Related
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- Transformers For Measuring Instruments (AREA)
Abstract
The utility model relates to a novel large current mutual inductor. A compensation winding N< B > (2) uniformly winds on a ring-shaped iron core (1) of the utility model; the inner periphery, the outer periphery, and both sides of the ring-shaped iron core are respectively arranged on a ring-shaped iron core; a magnetic shield is composed of the four iron cores; a secondary winding N< 2 > (7) uniform winds outside the four iron cores; N< B > = N< 2 >; an epoxy resin vacuum pouring body (8) is arranged outside the four iron cores. The utility model which is used to measure the error of a high current mutual inductor is more accurate than general measuring method, with power supply equipment cost saving multi-million yuan.
Description
The utility model belongs to electric energy metrical, is specifically related to a kind of novel great current mutual inductor.
The error of general current transformer all is that the standard current transformer by the same current ratio compares and measures.Therefore when measuring the error of great current mutual inductor, except the standard great current mutual inductor that needs the same current ratio, also need single-phase high-current supply, for the great current mutual inductor of 2kA to 100kA, its power supply capacity is about 5 to 10000kVA, at the on-the-spot great current mutual inductor that uses such as generator outlet and Source of Gateway Meter, because power supply can't carry out field-checking on it; On the other hand, the number of ampere turns of great current mutual inductor is big, if carry out Error Calculation by general current transformer, the error of instrument transformer is smaller, but a winding of great current mutual inductor generally constitutes by bus-bar, can't guarantee that it is equally distributed to transformer iron core, and great current mutual inductor all is a three-phase operation, it is local saturated that the external electromagnetic field that adjacent phase great current mutual inductor produces all may make the iron core of great current mutual inductor produce, thereby the error of great current mutual inductor is enlarged markedly.
The purpose of this utility model is exactly at the deficiencies in the prior art, provide a kind of for solve great current mutual inductor do not produce local saturated, with the novel great current mutual inductor of the error that guarantees its accuracy and field-checking great current mutual inductor.
The purpose of this utility model can realize by following measure:
On the annular core (1) of current transformer, evenly coiling compensates winding N earlier
B(2), its number of turn equals secondary winding N
2(7), respectively add the lastblock annular core on interior week, periphery and the both sides of iron core then, i.e. periphery shielding iron core (3), following shielding iron core (4), interior all shielding iron cores (5), last shielding iron core (6), totally four iron cores are formed magnetic screen, at last at four even coiling secondary winding N in iron core outside
2(7), its number of turn is determined by current ratio Kn, N
2=K
n, Kn is a primary current and the ratio of secondary current, wherein N
B=Kn.The outside is provided with epoxide resin vacuum pour mass (8).
Advantage:
Novel great current mutual inductor is no matter primary current is much, and power supply capacity also only need be slightly larger than the secondary capacity (being generally 20 to 120VA) of current transformer, and source current is 5A.
Adopt novel great current mutual inductor to survey the error of great current mutual inductor, more accurate than general calibration method, but conserver power source equipment, and can carry out the verification of transformer error easily at the scene.Error with the 100kA current transformer is an example, can save the millions of units of power-supply device expense.
Description of drawings:
Fig. 1 is a structure cutaway view of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Wherein: 1, main iron core 2, compensation winding N
B3, periphery shielding iron core 4, time shielding iron core 5, interior all shielding iron cores 6, last shielding iron core 7, secondary winding N
28, pour mass
Be described in further detail by embodiment below in conjunction with accompanying drawing:
For example, need a kind of novel great current mutual inductor of design, its specification requirement is: 0.1 grade, and withstand voltage 10KV, load 30VA, current ratio 4000/5A.The annular core cold-reduced silicon sheet of novel great current mutual inductor, annular core 1/be of a size of φ 260/ φ 290 * 40, evenly coiling compensates winding N on annular core 1
B2N
B2 is enamelled wire 800 circles of φ 0.8, respectively be provided with an annular core on interior week, periphery and the both sides of annular core 1 then, both periphery shielding iron core 3, down shielding iron core 4, interior all shielding iron cores 5, go up shielding iron core 6, four iron cores are formed magnetic screen, even coiling secondary winding N four iron cores outsides at last
27, its number of turn equals to compensate winding N
B2, secondary winding N
27 the number of turn is determined by current ratio Kn, N
2=K
n, Kn is a primary current and the ratio of secondary current.Novel great current mutual inductor outside is provided with epoxide resin vacuum pour mass 8.Wherein, periphery shielding iron core 3 is of a size of φ 300/ φ 310 * 50, and interior all shielding iron cores 5 are of a size of φ 240/ φ 250 * 50, and shielding iron core 6.4 is of a size of φ 245/ φ 350 * 50, secondary winding N up and down
27 is enamelled wire 800 circles of φ 2.0.
Claims (2)
1, a kind of annular core (1), compensation winding N of including
B(2), magnetic screen, secondary winding N
2(7) novel great current mutual inductor, it is characterized in that evenly being wound with on the annular core (1) compensation winding NB (2), respectively be provided with an annular core on interior week, periphery and the both sides of annular core (1), both periphery shielding iron cores (3), following shielding iron core (4), interior all shielding iron cores (5), last shielding iron core (6), four iron cores are formed magnetic screen, evenly are wound with secondary winding N four iron core outsides
2(7), its number of turn is determined by current ratio Kn, N
2=K
n, Kn is a primary current and the ratio of secondary current, wherein N
B=K
n
2, novel great current mutual inductor according to claim 1 is characterized in that its outside is provided with epoxide resin vacuum pour mass (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98217419 CN2353025Y (en) | 1998-07-23 | 1998-07-23 | Large current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98217419 CN2353025Y (en) | 1998-07-23 | 1998-07-23 | Large current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2353025Y true CN2353025Y (en) | 1999-12-08 |
Family
ID=33970025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98217419 Expired - Fee Related CN2353025Y (en) | 1998-07-23 | 1998-07-23 | Large current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2353025Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074344A (en) * | 2010-12-06 | 2011-05-25 | 保定天威集团有限公司 | Secondary winding group structure of current transformer |
-
1998
- 1998-07-23 CN CN 98217419 patent/CN2353025Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074344A (en) * | 2010-12-06 | 2011-05-25 | 保定天威集团有限公司 | Secondary winding group structure of current transformer |
| CN102074344B (en) * | 2010-12-06 | 2012-09-05 | 保定天威集团有限公司 | Secondary winding group structure of current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |