CN101369485A - Production method of high-impedance and high-sensibility zero-sequence current transformer - Google Patents
Production method of high-impedance and high-sensibility zero-sequence current transformer Download PDFInfo
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- CN101369485A CN101369485A CNA2007101387401A CN200710138740A CN101369485A CN 101369485 A CN101369485 A CN 101369485A CN A2007101387401 A CNA2007101387401 A CN A2007101387401A CN 200710138740 A CN200710138740 A CN 200710138740A CN 101369485 A CN101369485 A CN 101369485A
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- sequence current
- current transformer
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- millimeters
- sensibility
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Abstract
The invention relates to a method for manufacturing a zero sequence current transformer with high impedance and high sensitiveness, which comprises firstly selecting cold rolling silicon steel sheets with high induction magnetic performance as iron core material for stand-by; then shearing and coiling the selected cold rolling silicon steel sheets with high induction magnetic performance to make into the ring-shaped iron core; performing annealing heat treatment for the made ring-shaped iron core, keeping temperature of the heat treatment between 715 DEG C and 745 DEG C, making into the ring-shaped iron core of definite specification according to the requirement; winding the enamel wire to the ring-shaped iron core of definite specification using the winding machine again; at last, performing layer insulation and anti-damp treatments of dipping lacquer and drying of the ring-shaped iron core winded with the enamel wire. The method can provide the zero sequence current transformer which can not only endure short circuit current rush, but also produce high impedance and high sensitiveness.
Description
Technical field
The present invention relates to a kind of manufacture method of zero sequence current mutual inductor, the manufacture method of especially a kind of high impedance, high-sensibility zero-sequence current transformer.
Background technology
The iron core of home and abroad high-sensibility zero-sequence current transformer; permalloy or the nickel-base amorphous high permeability materials of iron of adopting are made more; though and this high permeability magnetic material is made zero sequence current mutual inductor sensitivity height; but in operate time, the expection residual electricity flow valuve of being born is but very little at short-circuit protective device.When being used for low voltage electric network and doing the protection of total circuit, if when metallic short circuit ground connection occurring, the zero sequence current mutual inductor that such magnetic material is made is subjected to will being disintegrated behind the heavy current impact, causes scrapping.
Summary of the invention
The objective of the invention is to address the aforementioned drawbacks, and a kind of short-circuit current rush that can tolerate is provided, can produce the manufacture method of high impedance, high-sensitive zero sequence current mutual inductor again.
The object of the present invention is achieved like this, and its technical scheme that adopts is as follows:
The manufacture method of a kind of high impedance, high-sensibility zero-sequence current transformer may further comprise the steps:
(1) select for use the cold rolling silicon steel sheet of high induced magnetism performance as core material, standby;
(2) the cold rolling silicon steel sheet of high induced magnetism performance that cuts across and reel and select for use is made annular core;
(3) the above-mentioned annular core of making is annealed heat treatment, heat treated temperature remains between 715 ℃ to 745 ℃, and as requested, makes the annular core of certain specification;
(4) utilize the annular core of the past above-mentioned specification of coil winding machine around last enamelled wire;
(5) last, the above-mentioned annular core that winds enamelled wire is performed layer insulation and the moistureproof processing of paint-dipping drying.
Purpose of the present invention can also be achieved in that
Described cut across and the cold rolling silicon steel sheet of high induced magnetism performance of reeling is to carry out synchronously is to keep iron core even, smooth.
After the annealed heat treatment of described annular core, its specification internal diameter ф is between 45 millimeters to 65 millimeters, and external diameter ф is between 145 millimeters to 160 millimeters, highly is between 65 millimeters to 70 millimeters.
It is the round copper enamelled wire of 1.3-1.35 millimeter that described enamelled wire is selected external diameter ф for use.
The described annular core that winds enamelled wire, its primary coil are 800 circle to 1000 circles, and secondary coil is 1 circle.
Technique effect of the present invention is: because the present invention has adopted the cold rolling silicon steel sheet of high induced magnetism performance as core material, make the zero sequence current mutual inductor of making can tolerate short-circuit current rush, have high impedance and high sensitivity again; Moreover when making above-mentioned instrument transformer, the cold rolling selenium steel disc of high induced magnetism performance that cuts across simultaneously, reels to keep coiling iron core even, smooth, is made annular core, shortens the length of magnetic path, reduces magnetic resistance.
Description of drawings
Fig. 1 is the flow chart of manufacture method of the present invention
Fig. 2 is zero sequence current mutual inductor test philosophy figure of the present invention
Embodiment
As shown in Figure 1, the manufacture method of a kind of high impedance, high-sensibility zero-sequence current transformer may further comprise the steps:
Step 1: at first, the cold rolling silicon steel sheet of high induced magnetism performance of selecting Japan's product for use is as core material, and is standby;
Step 2: with a kind of equipment that can cut across simultaneously and reel, the cold rolling silicon steel sheet of selecting for use of above-mentioned high induced magnetism performance is cut across synchronously and reel,, make annular core in order to keep coiling iron core even, smooth; To realize shortening the length of magnetic path, reduce the effect of magnetic resistance;
Step 3: with the heat treatment of annealing of the above-mentioned annular core of making, heat treated temperature remains between 715-℃ to 745 ℃, and as requested, make the annular core of certain specification, the specification internal diameter ф that is iron core is between 45 millimeters to 65 millimeters, external diameter ф is between 145 millimeters to 160 millimeters, highly is between 65 millimeters to 70 millimeters;
Step 4: the annular core that utilizes the past above-mentioned specification of coil winding machine is around the round copper enamelled wire of top external diameter ф for the 1.3-1.35 millimeter, and its primary coil is 800 circle to 1000 circles, and secondary coil is 1 circle, to satisfy instructions for use;
Step 5: last, the above-mentioned annular core that winds enamelled wire is performed layer insulation and the moistureproof processing of paint-dipping drying.
With high impedance, the high-sensibility zero-sequence current transformer that said method is made, test with following method, reach following technical indicator: the D.C. resistance of surveying primary coil with double bridge should be less than 3-2.5 ohm; Resistance value: as shown in Figure 2, test with 0.5 step voltage table, miliammeter, miliammeter is serially connected with in the primary coil loops, voltmeter is parallel to both ends of power, applies 220 volts of alternating voltages, and the miliammeter indication should be less than or equal to 8.5 milliamperes.Be that resistance value should be more than or equal to 25 kilohms.
Claims (5)
1. the manufacture method of a high impedance, high-sensibility zero-sequence current transformer is characterized in that, may further comprise the steps:
(1) select for use the cold rolling silicon steel sheet of high induced magnetism performance as core material, standby;
(2) the cold rolling silicon steel sheet of high induced magnetism performance that cuts across and reel and select for use is made annular core;
(3) the above-mentioned annular core of making is annealed heat treatment, heat treated temperature remains between 715 ℃ to 745 ℃, and as requested, makes the annular core of certain specification;
(4) utilize the annular core of the past above-mentioned specification of coil winding machine around last enamelled wire;
(5) last, the above-mentioned annular core that winds enamelled wire is performed layer insulation and the moistureproof processing of paint-dipping drying.
2. the manufacture method of high impedance according to claim 1, high-sensibility zero-sequence current transformer is characterized in that, described cut across and the cold rolling silicon steel sheet of high induced magnetism performance of reeling is to carry out synchronously is to keep iron core even, smooth.
3. the manufacture method of high impedance according to claim 1, high-sensibility zero-sequence current transformer, it is characterized in that, after the annealed heat treatment of described annular core, its specification internal diameter ф is between 45 millimeters to 65 millimeters, external diameter ф is between 145 millimeters to 160 millimeters, highly is between 65 millimeters to 70 millimeters.
4. the manufacture method of high impedance according to claim 1, high-sensibility zero-sequence current transformer is characterized in that, it is the round copper enamelled wire of 1.3-1.35 millimeter that described enamelled wire is selected external diameter ф for use.
5. the manufacture method of high impedance according to claim 1, high-sensibility zero-sequence current transformer is characterized in that, the described annular core that winds enamelled wire, its primary coil are 800 circle to 1000 circles, and secondary coil is 1 circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101387401A CN101369485A (en) | 2007-08-13 | 2007-08-13 | Production method of high-impedance and high-sensibility zero-sequence current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101387401A CN101369485A (en) | 2007-08-13 | 2007-08-13 | Production method of high-impedance and high-sensibility zero-sequence current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101369485A true CN101369485A (en) | 2009-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101387401A Pending CN101369485A (en) | 2007-08-13 | 2007-08-13 | Production method of high-impedance and high-sensibility zero-sequence current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101369485A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867617A (en) * | 2012-10-10 | 2013-01-09 | 河南开启电力实业有限公司 | Zero sequence current transformer and manufacturing method thereof |
| CN106158343A (en) * | 2016-08-25 | 2016-11-23 | 河南森源电气股份有限公司 | The production method of Open Type Electric Current Mutual Inductor |
-
2007
- 2007-08-13 CN CNA2007101387401A patent/CN101369485A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867617A (en) * | 2012-10-10 | 2013-01-09 | 河南开启电力实业有限公司 | Zero sequence current transformer and manufacturing method thereof |
| CN102867617B (en) * | 2012-10-10 | 2015-12-09 | 河南开启电力实业有限公司 | Zero sequence current mutual inductor and preparation method thereof |
| CN106158343A (en) * | 2016-08-25 | 2016-11-23 | 河南森源电气股份有限公司 | The production method of Open Type Electric Current Mutual Inductor |
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Open date: 20090218 |