CN204228880U - A kind of residual current transformer - Google Patents
A kind of residual current transformer Download PDFInfo
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- CN204228880U CN204228880U CN201420720984.6U CN201420720984U CN204228880U CN 204228880 U CN204228880 U CN 204228880U CN 201420720984 U CN201420720984 U CN 201420720984U CN 204228880 U CN204228880 U CN 204228880U
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- residual current
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Abstract
The utility model provides a kind of residual current transformer, comprise conducting magnet core, be wrapped in the coil on described conducting magnet core outside surface and be coated on the wrapping layer of described coil outer, also comprise screen layer, described screen layer is arranged at the outside of residual current transformer, and described screen layer comprises the upper cover and lower cover that cooperatively interact, has gap between described upper cover and lower cover.The utility model has highly sensitive, that degree of accuracy is high, antijamming capability is strong advantage.
Description
Technical field
The utility model proposes a kind of electrical equipment, especially relating to one can residual current in measuring circuit, and highly sensitive, that precision is high residual current transformer.
Background technology
In electric fire monitoring system, be used for detecting the residual electricity flow valuve in protected power circuit and transmit the sensor of relevant information to electrical fire monitoring device, being generally residual current transformer.The residual current monitoring residual current of reporting to the police on the residual current transformer detection line that mainly relies on and be loaded on monitored distribution line realizes.Residual current transformer is in fact a high-sensitive current transformer, and it can detect the little Weak current arriving several milliamperes or tens milliamperes on circuit.
But in prior art, because of a magnetic potential of measurement current transform er and secondary magnetic potential in a basic balance, excitation magnetic potential is very little, magnetic flux density in iron core and the induced potential of Secondary Winding are not high, so its core section can do less, when this type of mutual inductor is used in and measures residual current, only at a load current (A, B, C, N phase) relatively little time, namely the through hole of mutual inductor is less, and working current less (100A or following), under the environment for use of static state, (i.e. non-power distribution cabinet energising environment) still can keep necessary sensitivity and measuring accuracy.When through hole is comparatively large and a load current is large or in energising power distribution cabinet environment (when having power frequency magnetic field affect) due to the iron core of mutual inductor by power frequency magnetic field saturated or fractional saturation, so the sensitivity of measurement leakage current and degree of accuracy cannot meet the demands.
Utility model content
In order to solve the problem, the utility model provides a kind of highly sensitive, degree of accuracy is high, antijamming capability is strong residual current transformer.A kind of residual current transformer that the utility model provides, the technical scheme of employing is specific as follows:
A kind of residual current transformer, comprise conducting magnet core, be wrapped in the coil on conducting magnet core outside surface and be coated on the wrapping layer of coil outer, also comprise screen layer, screen layer is arranged at the outside of residual current transformer, and screen layer comprises the upper cover and lower cover that cooperatively interact, has gap between upper cover and lower cover.
Be characterized as further: the width in gap is 1.6mm-16mm.
Be characterized as further: screen layer is metal screen layer.
Be characterized as further: metal screen layer is steel matter screen layer.
Be characterized as further: the surface of metal screen layer is coated with zinc layers.
Be characterized as further: the thickness of screen layer is not less than 0.9mm.
The utility model compared with the existing technology, has the following advantages and beneficial effect:
1, the utility model has screen layer, the power frequency magnetic field produced when compared with prior art effectively can resist normal power-up work in power distribution cabinet is to the interference of transformer iron core magnetic inductor, thus the monitoring error of degree of accuracy within the scope of 20 ~ 1000mA is contracted to be less than or equal to ± 3%, and the error range that GB GB14287.2 requires is for being not more than 5%, therefore substantially increase detection sensitivity and the degree of accuracy of residual current transformer.
2, the screen layer in the utility model is steel matter screen layer, and steel matter screen layer has good ductility, and easy to process, saves processing cost.
The surface of the screen layer 3, in the utility model is coated with zinc layers, makes screen layer have the characteristic of outstanding corrosion-resistant, oxidation, extends the serviceable life of the residual current transformer that the utility model provides, saved cost.
4, the shielding thickness in the utility model is not less than 0.9mm, to guarantee to mask electromagnetic interference (EMI) completely, makes the detection of residual current transformer more accurate.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of residual current transformer of the utility model;
Fig. 2 is the shielding layer structure schematic diagram of a kind of residual current transformer of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment
As depicted in figs. 1 and 2, a kind of residual current transformer, comprise conducting magnet core 1, be wrapped in the coil 2 on conducting magnet core 1 outside surface and the wrapping layer 3 being coated on coil 2 outside, also comprise screen layer 4 and residual current signal extension line 5, screen layer 4 is arranged at the outside of residual current transformer, and screen layer 4 comprises the upper cover 41 and lower cover 42 that cooperatively interact, between upper cover 41 and lower cover, 42 have gap 43, the colligation adhesive tape of upper cover 41 and lower cover is fixed, fixed form adopts how point-symmetric mode to fix, such as: adopt fix at 3, differential seat angle between every two point of fixity is 120 °, one end of residual current signal extension line 5 is connected with coil 2, the other end is through the outside of the major loop wire through hole on screen layer 4 to residual current transformer, and be connected with miscellaneous equipment relevant device.
Optimal way of the present utility model is: the width in gap 43 is 1.6mm-16mm, this width is the signal accuracy and the armoured magnetic field leakage field situation that consider mutual inductor, when showing that gap 43 width value is above-mentioned scope by limited number of time test, the testing result of mutual inductor is the most accurate.
Screen layer 4 is metal screen layer, and metal screen layer surface is coated with zinc layers, for preventing screen layer 4, oxidation corrosion occurs.
Metal screen layer is steel matter screen layer or iron material matter screen layer.
According to actual needs, the wire working current namely wearing residual current transformer determines the thickness of screen layer 4, but is less than 0.9mm scarcely, otherwise does not have shielding power frequency magnetic field to the effect of the interference of transformer iron core magnetic inductor.
The utility model has screen layer, the power frequency magnetic field produced when compared with prior art effectively can resist normal power-up work in power distribution cabinet to the interference of transformer iron core magnetic inductor, thus substantially increases detection sensitivity and the degree of accuracy of residual current transformer.
Screen layer in the utility model is steel matter screen layer, and steel matter screen layer has good ductility, and easy to process, saves processing cost.
The surface of the screen layer in the utility model is coated with zinc layers, makes screen layer have the characteristic of outstanding corrosion-resistant, oxidation, extends the serviceable life of the residual current transformer that the utility model provides, saved cost.
Shielding thickness in the utility model is not less than 0.9mm, to guarantee to mask electromagnetic interference (EMI) completely, makes the detection of residual current transformer more accurate.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. a residual current transformer, comprise conducting magnet core, be wrapped in the coil on described conducting magnet core outside surface and be coated on the wrapping layer of described coil outer, it is characterized in that, also comprise screen layer, described screen layer is arranged at the outside of residual current transformer, and described screen layer comprises the upper cover and lower cover that cooperatively interact, has gap between described upper cover and lower cover.
2. a kind of residual current transformer according to claim 1, is characterized in that, the width in described gap is 1.6mm-16mm.
3. a kind of residual current transformer according to claim 1, is characterized in that, described screen layer is metal screen layer.
4. a kind of residual current transformer according to claim 3, is characterized in that, described metal screen layer is steel matter screen layer.
5. a kind of residual current transformer according to claim 3, is characterized in that, the surface of described metal screen layer is coated with zinc layers.
6. a kind of residual current transformer according to claim 1, is characterized in that, the thickness of described screen layer is not less than 0.9mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420720984.6U CN204228880U (en) | 2014-11-25 | 2014-11-25 | A kind of residual current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420720984.6U CN204228880U (en) | 2014-11-25 | 2014-11-25 | A kind of residual current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN204228880U true CN204228880U (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420720984.6U Active CN204228880U (en) | 2014-11-25 | 2014-11-25 | A kind of residual current transformer |
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| CN (1) | CN204228880U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459437A (en) * | 2014-11-25 | 2015-03-25 | 上海汇鸿智能控制系统有限公司 | Residual current transformer |
| CN109767901A (en) * | 2019-03-13 | 2019-05-17 | 浙江天际互感器有限公司 | A kind of anti-interference zero sequence current mutual inductor with electromagnetic balance function |
-
2014
- 2014-11-25 CN CN201420720984.6U patent/CN204228880U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459437A (en) * | 2014-11-25 | 2015-03-25 | 上海汇鸿智能控制系统有限公司 | Residual current transformer |
| CN109767901A (en) * | 2019-03-13 | 2019-05-17 | 浙江天际互感器有限公司 | A kind of anti-interference zero sequence current mutual inductor with electromagnetic balance function |
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| GR01 | Patent grant |