CN202929100U - Large-aperture pincerlike AC minimal current sensor apparatus - Google Patents
Large-aperture pincerlike AC minimal current sensor apparatus Download PDFInfo
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- CN202929100U CN202929100U CN 201220598387 CN201220598387U CN202929100U CN 202929100 U CN202929100 U CN 202929100U CN 201220598387 CN201220598387 CN 201220598387 CN 201220598387 U CN201220598387 U CN 201220598387U CN 202929100 U CN202929100 U CN 202929100U
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- pincerlike
- magnetic core
- sensor
- pincerlike magnetic
- current sensor
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Abstract
The utility model relates to a large-aperture pincerlike AC minimal current sensor apparatus, comprising a pincerlike magnetic core; the outside of the upper portion of the pincerlike magnetic core is sleeved by a first pincerlike sensor, and the outside of the lower portion of the pincerlike magnetic core is sleeved by a second pincerlike sensor. An external diameter of the second pincerlike sensor is no less than that of the first pincerlike sensor; the outside of the second pincerlike sensor is provided with a pincerlike magnetic core shielding body which shields the pincerlike magnetic core, the first pincerlike sensor and the second pincerlike sensor. The outside of the pincerlike magnetic core shielding body is provided with an electromagnetic shielding housing which shields the pincerlike magnetic core shielding body; the pincerlike magnetic core shielding body and the electromagnetic shielding housing are provided with holes communicating with a pincerlike magnetic core axial hole; the inner side of the pincerlike magnetic core shielding body is provided with a signal amplifier; an input terminal of the signal amplifier is in electric connection with the first pincerlike sensor and an output terminal of the signal amplifier is in electric connection with the second pincerlike sensor. The large aperture pincerlike AC minimal current sensor apparatus possesses high precision and wide measuring scope and is influenced less by extraneous environment.
Description
Technical field
The utility model relates to a kind of equipment that electric system capacitive apparatus leakage current signal is sampled; The pincerlike Weak current sensor device that exchanges of the heavy caliber of the small ac current signal sampling when relating in particular to capacitive apparatus end shield down conductor and can't open.
Background technology
A large amount of capacitive apparatus is arranged in electric system, as current transformer, voltage transformer (VT) etc., occupy sizable ratio in electrical network, their insulating property play vital effect for safety, the stable operation of electrical network, and dielectric loss angle tangent (tan δ) is the important parameter of its insulating property of reflection.
The detection of dielectric loss angle tangent (tan δ) at first needs the extraction to the leakage current signal of capacitive apparatus, and the main mode that adopts the scene to pre-install the single turn core type current sensor is extracted the leakage current signal of capacitive apparatus at present.The shortcoming of this mode is that each capacitive apparatus needs to pre-install a single turn core type current sensor, and the site operation amount is large, somewhat expensive; And when breaking down, prepackage single turn core type current sensor can't carry out the operation of corresponding band electro-detection.Also there is at present pair down conductor to transform, the node that formation can disconnect, the mode of introducing the core-theaded type current sensor with shorting stub obtains the mode of leakage current.The possibility that this method exists down conductor to disconnect all brings risk for tester's personal safety and security of system.
Present existing pincerlike Weak current sensor jaw is all smaller, is not suitable for on-the-spot wider flat down conductor, and domestic yet do not had pincerlike AC current sensor for the report of measuring capacitive apparatus medium loss tangent (tan δ).This is because the high voltage capacitive apparatus leakage current signal is very little, what have is only a microampere order of magnitude, and existing pincerlike AC current sensor is all to adopt single core structure, the pincerlike AC current sensor of this class is when measuring small alternating current, be subjected to the impact of its peripheral distributed capacitance and distributed inductance, the amplitude error that records and angular error can not satisfy the requirement of measuring dielectric loss value error range.
Summary of the invention
The purpose of this utility model is in order to overcome defects and deficiency, the pincerlike Weak current sensor device that exchanges of heavy caliber that under a kind of satisfied on-the-spot service condition, the interchange minute leakage electric current of capacitive apparatus is carried out sampling with high precision is provided, and the judgement of carrying out insulating property for on-the-spot high voltage capacitive apparatus under ruuning situation provides reliable basis.
for achieving the above object, the pincerlike Weak current sensor device that exchanges of the heavy caliber of the utility model design, comprise pincerlike magnetic core, the upper outside of described pincerlike magnetic core is arranged with the first pincerlike sensor, the lower outside of pincerlike magnetic core is arranged with the second pincerlike sensor, the external diameter of described the second pincerlike sensor is more than or equal to the described first pincerlike sensor, the outside of described the second pincerlike sensor is provided with pincerlike magnetic core shield, described pincerlike magnetic core shield is with pincerlike magnetic core, the first pincerlike sensor and the second pincerlike sensor mask, the outside of described pincerlike magnetic core shield is provided with shielding casing, described shielding casing shields pincerlike magnetic core shield, offer the hole that communicates with pincerlike magnetic core axial hole on described pincerlike magnetic core shield and shielding casing, the inboard of described pincerlike magnetic core shield is provided with signal amplifier, the input end of described signal amplifier is connected with the described first pincerlike sensor electrical, the output terminal of described signal amplifier is connected with the described second pincerlike sensor electrical.
In technique scheme, the described first pincerlike sensor comprises pincerlike magnetic core W1 and pincerlike magnetic core W2, described pincerlike magnetic core W1 and pincerlike magnetic core W2 are encircled into the column magnetic core, are wound with secondary winding W1 on described pincerlike magnetic core W1, are wound with on described pincerlike magnetic core W2 to detect winding W1.
The described above second pincerlike sensor comprises pincerlike magnetic core W3 and pincerlike magnetic core W4, and described pincerlike magnetic core W3 and pincerlike magnetic core W4 are encircled into the column magnetic core, is wound with secondary winding W2 on described pincerlike magnetic core W3, is wound with compensation winding W2 on described pincerlike magnetic core W4.
Above-mentioned pincerlike magnetic core internal diameter 〉=50 millimeters, thickness 〉=8 millimeter; The first pincerlike sensor internal diameter 〉=70 millimeters, thickness 〉=10 millimeter; The second pincerlike sensor internal diameter 〉=70 millimeters, thickness 〉=10 millimeter.
The input end of above-mentioned signal amplifier is connected with the coiling exit that detects winding W1, and the signal amplifier output terminal is connected with compensation winding W2 coiling exit, described compensation winding W2 coiling other end ground connection.
Above-mentioned pincerlike magnetic core shield is the siliconized plate material.
Above-mentioned shielding casing is made of electromagnetic screen skin and electromagnetic screen internal layer, is isolated by the epoxy plate insulation between electromagnetic screen skin and electromagnetic screen internal layer.
Above-mentioned electromagnetic screen skin and electromagnetic screen internal layer are copper material.
Above-mentioned pincerlike magnetic core, pincerlike magnetic core W1 and pincerlike magnetic core W2, pincerlike magnetic core W3 and pincerlike magnetic core W4 are the permalloy material.
The interface of above-mentioned pincerlike magnetic core, pincerlike magnetic core W1 and pincerlike magnetic core W2, pincerlike magnetic core W3 and pincerlike magnetic core W4 adopts plug-in type and tight closure, prevents magnetic leakage.
Each winding of the present utility model: the wire diameter of secondary winding W1, detection winding W1, secondary winding W2 and compensation winding W2 is respectively: be no more than 2 peaces/millimeter by current density
2Consider, it is the enameled wire of 0.5 millimeter that secondary winding W1 adopts diameter, detects winding W1 and survey winding W2 that all to adopt diameter be the enameled wire coiling of 0.3 millimeter.The number of turn of winding is respectively: secondary winding W1 and detection winding W1 coiling 1000 circles, compensation winding W2 coiling 150 circles.
The utlity model has following advantages and good effect:
1, jaw of the present utility model can reach 40mm, uses at the scene band steel to do down conductor and also can easily access and measure;
2, adopt the error auto compensatng technology, pincerlike interchange Weak current sensor secondary current and primary current without changing features, can accurately be measured a microampere rank alternating current without phase differential, waveform;
3, the utility model is simple in structure, cost is lower, be easy to realization;
4, the utility model adopts double-deck copper shield technology effectively to solve on-the-spot interference to the impact of measurement result, and the test result degree of accuracy is high;
Easy and simple to handle when 5, the utility model uses, be easy to skilled grasp, reduced staff's labour intensity, the probability of making a fault is little, has improved safety and reliability.
Description of drawings
Fig. 1 is one-piece construction schematic diagram of the present utility model (pincerlike magnetic core shield (4) and shielding casing (5) are sectional view);
Fig. 2 is pincerlike magnetic core (1) structural representation in Fig. 1;
Fig. 3 is the first pincerlike sensor (2) structural representation in Fig. 1;
Fig. 4 is the second pincerlike sensor (3) structural representation in Fig. 1;
Fig. 5 is the cross-sectional view of pincerlike magnetic core shield (4) in Fig. 1;
Fig. 6 is the cross-sectional view of shielding casing in Fig. 1 (5);
Fig. 7 is signal amplifier (6) schematic diagram;
Fig. 8 is schematic circuit of the present utility model;
In figure: 1, pincerlike magnetic core; 2, the first pincerlike sensor (2.1, pincerlike magnetic core W1; 2.2, pincerlike magnetic core W2; 2.3, secondary winding W1; 2.4, detect winding W1); 3, the second pincerlike sensor (3.1, pincerlike magnetic core W3; 3.2, pincerlike magnetic core W4; 3.3, secondary winding W2; 3.4, compensation winding W2); 4, pincerlike magnetic core shield; 5, shielding casing (5.1, electromagnetic screen is outer; 5.2 the electromagnetic screen internal layer); 6, signal amplifier.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
the pincerlike Weak current sensor device that exchanges of heavy caliber as shown in Figure 1, comprise pincerlike magnetic core 1, the concrete structure of pincerlike magnetic core 1 as shown in Figure 2, the upper outside of pincerlike magnetic core 1 is arranged with the first pincerlike sensor 2, the lower outside of pincerlike magnetic core 1 is arranged with the second pincerlike sensor 3, the external diameter of the second pincerlike sensor 3 is more than or equal to the first pincerlike sensor 2, the outside of the second pincerlike sensor 3 is provided with pincerlike magnetic core shield 4, pincerlike magnetic core shield 4 is with pincerlike magnetic core 1, the first pincerlike sensor 2 and the second pincerlike sensor 3 shieldings, the outside of pincerlike magnetic core shield 4 is provided with shielding casing 5, shielding casing 5 is with pincerlike magnetic core shield 4 shieldings, offer the hole that communicates with pincerlike magnetic core 1 axial hole on pincerlike magnetic core shield 4 and shielding casing 5, the inboard of pincerlike magnetic core shield 4 is provided with signal amplifier 6, the input end of signal amplifier 6 is electrically connected to the first pincerlike sensor 2, the output terminal of signal amplifier 6 is electrically connected to the second pincerlike sensor 3.
As shown in Figure 3, the first pincerlike sensor 2 comprises pincerlike magnetic core W1(2.1) and pincerlike magnetic core W2(2.2), pincerlike magnetic core W1(2.1) and pincerlike magnetic core W2(2.2) be encircled into the column magnetic core, pincerlike magnetic core W1(2.1) be wound with secondary winding W1(2.3 on), pincerlike magnetic core W2(2.2) on be wound with detect winding W1(2.4).
As shown in Figure 4, the second pincerlike sensor 3 comprises pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2), pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2) be encircled into the column magnetic core, be wound with secondary winding W2(3.3 on pincerlike magnetic core W3 (3.1)), pincerlike magnetic core W4(3.2) on be wound with compensation winding W2(3.4).
Secondary winding W1(2.3) and secondary winding W2(3.3) be same winding wire, as the secondary winding of the utility model current sensor.Pincerlike magnetic core 1, pincerlike magnetic core W1 (2.1) and pincerlike magnetic core W2(2.2), pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2) be the permalloy material.Pincerlike magnetic core 1, pincerlike magnetic core W1(2.1) and pincerlike magnetic core W2(2.2), pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2) interface employing plug-in type and tight closure.
Pincerlike magnetic core 1 internal diameter 〉=50 millimeters, thickness 〉=8 millimeter; The first pincerlike sensor 2 internal diameters 〉=70 millimeters, thickness 〉=10 millimeter; The second pincerlike sensor 3 internal diameters 〉=70 millimeters, thickness 〉=10 millimeter.Pincerlike magnetic core shield 4 is the siliconized plate material, and shielding casing 5 is made of electromagnetic screen outer 5.1 and electromagnetic screen internal layer 5.2, is isolated by the epoxy plate insulation between electromagnetic screen outer 5.1 and electromagnetic screen internal layer 5.2.Electromagnetic screen outer 5.1 and electromagnetic screen internal layer 5.2 are copper material.
Principle of work of the present utility model is consulted shown in Figure 8, adopts the current transformer of automatic compensation type, suppresses the error that distributed inductance produces.Why existing current transformer exists measuring error, mainly owing to existing distributed capacitance and distributed inductance to cause, so-called distributed capacitance refers to the electric capacity in current transformer former limit winding and secondary winding itself and formation between the two, this error is only more remarkable when upper frequency, and relevant with umber of turn what and technique.The utility model adopts the power frequency electricity to satisfy the high condition of frequency, is no more than in the number of turn under 1000 condition, and the error general control that its distributed capacitance causes is 10
-5Below the order of magnitude.Distributed inductance is mainly caused by secondary coil, and particularly for the less current transformer of secondary current, the impact of this factor is just more obvious, and the utility model has adopted the current transformer of automatic compensation type, suppresses the error that distributed inductance produces.
The utility model adopts the first pincerlike sensor 2 and 3 two sensors of the second pincerlike sensor, during use, the sensed current line is armature winding shown in Figure 1, pass the axis centre hole of pincerlike magnetic core 1, pass the pincerlike former limit winding and compensation winding W2(3.4 that exchanges the Weak current sensor) jointly to pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2) excitatory.Compensation winding W2(3.4) exciting curent in is by detecting winding W1(2.4) in electric current provide by amplifier, when amplifier is connected into negative feedback, under degenerative effect, around pincerlike magnetic core W2(2.2) on detection winding W1(2.4) the secondary electromotive force of induction approaches and to equal zero, pincerlike magnetic core W2(2.2) be similar to the zero magnetic flux state that is operated in, so I1=I2 is arranged, wherein I1 is that winding detects winding W1(2.4) in the electric current that flows through, I2 is compensation winding W2(3.4) in the electric current that flows through, transformer error is close to zero.
Be compensated winding W2(3.4 after negative-feedback amplifier) exciting curent, to pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2) compensate.The utility model is the little split-core type current sensor that the mode of many iron cores self-adapted sensor electromotive force compensation is made, have that precision is high, measurement range is wide, the little characteristics that are affected by the external environment, be fit to be applied in capacitive apparatus live testing system the measurement to dielectric loss fully.
Claims (10)
1. a heavy caliber pincer exchanges the Weak current sensor device, comprise pincerlike magnetic core (1), it is characterized in that: the upper outside of described pincerlike magnetic core (1) is arranged with the first pincerlike sensor (2), the lower outside of pincerlike magnetic core (1) is arranged with the second pincerlike sensor (3), the external diameter of the described second pincerlike sensor (3) is more than or equal to the described first pincerlike sensor (2), the outside of the described second pincerlike sensor (3) is provided with pincerlike magnetic core shield (4), described pincerlike magnetic core shield (4) is with pincerlike magnetic core (1), the first pincerlike sensor (2) and the shielding of the second pincerlike sensor (3), the outside of described pincerlike magnetic core shield (4) is provided with shielding casing (5), described shielding casing (5) shields pincerlike magnetic core shield (4), offer the hole that communicates with pincerlike magnetic core (1) axial hole on described pincerlike magnetic core shield (4) and shielding casing (5), the inboard of described pincerlike magnetic core shield (4) is provided with signal amplifier (6), the input end of described signal amplifier (6) is electrically connected to the described first pincerlike sensor (2), the output terminal of described signal amplifier (6) is electrically connected to the described second pincerlike sensor (3).
2. heavy caliber pincer according to claim 1 exchanges the Weak current sensor device, it is characterized in that: the described first pincerlike sensor (2) comprises pincerlike magnetic core W1(2.1) and pincerlike magnetic core W2(2.2), described pincerlike magnetic core W1(2.1) and pincerlike magnetic core W2(2.2) be encircled into the column magnetic core, described pincerlike magnetic core W1(2.1) be wound with secondary winding W1(2.3 on), described pincerlike magnetic core W2(2.2) on be wound with detect winding W1(2.4).
3. heavy caliber pincer according to claim 2 exchanges the Weak current sensor device, it is characterized in that: the described second pincerlike sensor (3) comprises pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2), described pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2) be encircled into the column magnetic core, described pincerlike magnetic core W3(3.1) be wound with secondary winding W2(3.3 on), described pincerlike magnetic core W4(3.2) on be wound with compensation winding W2(3.4).
4. pincerlike Weak current sensor devices that exchange of according to claim 2 or 3 described heavy calibers is characterized in that: described pincerlike magnetic core (1) internal diameter 〉=50 millimeters, thickness 〉=8 millimeter; The first pincerlike sensor (2) internal diameter 〉=70 millimeters, thickness 〉=10 millimeter; The second pincerlike sensor (3) internal diameter 〉=70 millimeters, thickness 〉=10 millimeter.
5. heavy caliber pincer according to claim 3 exchanges the Weak current sensor device, it is characterized in that: the input end of described signal amplifier (6) and detect winding W1(2.4) the coiling exit be connected, signal amplifier (6) output terminal and compensation winding W2(3.4) the coiling exit is connected, described compensation winding W2(3.4) other end ground connection winds the line.
6. according to claim 1 and 2 or 3 described heavy calibers pincers exchange the Weak current sensor devices, and it is characterized in that: described pincerlike magnetic core shield (4) is the siliconized plate material.
7. according to claim 1 and 2 or 3 described heavy calibers pincers exchange the Weak current sensor devices, it is characterized in that: described shielding casing (5) is made of electromagnetic screen outer (5.1) and electromagnetic screen internal layer (5.2), is isolated by the epoxy plate insulation between electromagnetic screen outer (5.1) and electromagnetic screen internal layer (5.2).
8. heavy caliber pincer according to claim 7 exchanges the Weak current sensor device, it is characterized in that: described electromagnetic screen outer (5.1) and electromagnetic screen internal layer (5.2) are copper material.
9. the pincerlike Weak current sensor device that exchanges of heavy caliber according to claim 3, is characterized in that: described pincerlike magnetic core (1), pincerlike magnetic core W1(2.1) and pincerlike magnetic core W2(2.2), pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2) be the permalloy material.
10. the pincerlike Weak current sensor device that exchanges of heavy caliber according to claim 9, is characterized in that: described pincerlike magnetic core (1), pincerlike magnetic core W1(2.1) and pincerlike magnetic core W2(2.2), pincerlike magnetic core W3(3.1) and pincerlike magnetic core W4(3.2) interface employing plug-in type and tight closure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220598387 CN202929100U (en) | 2012-11-14 | 2012-11-14 | Large-aperture pincerlike AC minimal current sensor apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220598387 CN202929100U (en) | 2012-11-14 | 2012-11-14 | Large-aperture pincerlike AC minimal current sensor apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN202929100U true CN202929100U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220598387 Withdrawn - After Issue CN202929100U (en) | 2012-11-14 | 2012-11-14 | Large-aperture pincerlike AC minimal current sensor apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944739A (en) * | 2012-11-14 | 2013-02-27 | 广东电网公司中山供电局 | Large-aperture forcipate micro-current sensor device |
-
2012
- 2012-11-14 CN CN 201220598387 patent/CN202929100U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944739A (en) * | 2012-11-14 | 2013-02-27 | 广东电网公司中山供电局 | Large-aperture forcipate micro-current sensor device |
| CN102944739B (en) * | 2012-11-14 | 2015-08-19 | 广东电网公司中山供电局 | Large-aperture forcipate micro-current sensor device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130508 Effective date of abandoning: 20150819 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130508 Effective date of abandoning: 20150819 |
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| RGAV | Abandon patent right to avoid regrant |