CN113341337A - Leakage inductance element, leakage detection circuit and water heater - Google Patents
Leakage inductance element, leakage detection circuit and water heater Download PDFInfo
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- CN113341337A CN113341337A CN202010135507.3A CN202010135507A CN113341337A CN 113341337 A CN113341337 A CN 113341337A CN 202010135507 A CN202010135507 A CN 202010135507A CN 113341337 A CN113341337 A CN 113341337A
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- 238000001514 detection method Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000004020 conductor Substances 0.000 claims abstract description 121
- 230000006698 induction Effects 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000005611 electricity Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a leakage inductance element, a leakage detection circuit and a water heater. The leakage inductance element includes: a first annular conductor surrounding a wire under test; the first annular conductor and the tested lead form an induction capacitor to induce the leakage voltage of the tested lead. Compared with the technical scheme of detecting the electric leakage by detecting the electric leakage current in the prior art, the electric leakage detection method can detect the electric leakage before a user gets an electric shock, so that the reliability of the electric leakage detection method for the electric leakage detection is higher. In addition, the leakage sensing element provided by the invention has a simple structure and is low in cost. In conclusion, the invention improves the reliability of leakage inductance on the basis of lower cost and is easy to realize. And the second annular conductor is arranged at the periphery of the first annular conductor, so that the interference of an external circuit on the first annular conductor can be shielded, and the voltage induced on the first annular conductor is only the voltage on the tested lead.
Description
Technical Field
The invention relates to the technical field of electric leakage detection, in particular to a leakage inductance element, a leakage detection circuit and a water heater.
Background
Water heaters are recently gaining favor as a household electrical appliance. However, the water heater has a risk of electric leakage during use, and personal injury caused by the electric leakage is huge, so research on electric leakage detection of electric appliances such as the water heater and the like is concerned.
In the prior art, leakage induction elements such as a leakage protection switch or a leakage coil are mostly adopted for the water heater to induce leakage current, but the action current of the leakage protection switch or the leakage coil is large, and a user generally acts to trigger leakage protection after getting an electric shock. Therefore, the conventional leakage inductance element has a problem of poor reliability.
Disclosure of Invention
The invention provides a leakage inductance element, a leakage detection circuit and a water heater, so as to improve the reliability of leakage inductance.
In a first aspect, the present invention provides a leakage inductance element comprising:
a first annular conductor surrounding a wire under test; the first annular conductor and the tested lead form an induction capacitor to induce the leakage voltage of the tested lead.
Optionally, the number of the first annular conductors is multiple, and the multiple first annular conductors surround different positions of the measured lead respectively.
Optionally, the inner diameters of a plurality of the first annular conductors are different in size.
Optionally, the measured conductor comprises a surface insulation layer; the outer diameter of the surface insulating layer is equal to the inner diameter of the first annular conductor.
Optionally, the leakage inductance element further includes: a second annular conductor located peripherally to the first annular conductor; the second annular conductor is spaced apart from the first annular conductor.
Optionally, the second annular conductor is electrically connected to a neutral line, or the second annular conductor is digitally electrically connected to a control circuit, or the second annular conductor is analog electrically connected to a control circuit.
Optionally, the leakage inductance element further comprises an insulating support; the insulating support supports the second annular conductor;
alternatively, the insulating support supports the first and second annular conductors.
Optionally, the tested conductor comprises a protective earth wire.
In a second aspect, the present invention further provides a leakage detecting circuit, including: the leakage protection circuit comprises a leakage control circuit and a leakage induction element, wherein the leakage control circuit is electrically connected with the first annular conductor, and the leakage control circuit is used for generating a leakage protection signal according to a leakage induction voltage generated by the received first annular conductor and a reference point.
Optionally, the leakage detection circuit further includes a detection circuit electrically connected between the first annular conductor and the leakage control circuit, and the detection circuit is configured to perform signal processing on the received leakage induction voltage on the first annular conductor.
In a third aspect, the present invention also provides a water heater comprising: a leakage detection circuit as claimed in any of the embodiments of the present invention.
In a fourth aspect, the present invention also provides a water heater comprising: a leakage inductance component as in any embodiment of the invention.
According to the invention, the first annular conductor is arranged to surround the tested lead, the first annular conductor and the tested lead form the induction capacitor, and the induction capacitor can induce leakage voltage, namely, whether the position to be tested is electrified is detected by adopting a non-electric contact method. That is, the present invention can detect the leakage even if the user does not get an electric shock by the leakage voltage. Compared with the technical scheme of detecting the electric leakage by detecting the electric leakage current in the prior art, the electric leakage detection method can detect the electric leakage before a user gets an electric shock, so that the reliability of the electric leakage detection method for the electric leakage detection is higher. In addition, the leakage sensing element provided by the invention has a simple structure and is low in cost. In conclusion, the invention improves the reliability of leakage inductance on the basis of lower cost and is easy to realize.
Drawings
Fig. 1 is a schematic structural diagram of a leakage inductance element according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another electric leakage sensing device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a leakage inductance element according to another embodiment of the present invention;
fig. 4 is a circuit schematic diagram of a leakage detection circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a water heater according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a leakage inductance element which can be suitable for the leakage inductance of an electric product. Fig. 1 is a schematic structural diagram of a leakage inductance element according to an embodiment of the present invention. Referring to fig. 1, the leakage inductance element includes a first loop conductor 10. The first loop conductor 10 surrounds the wire 20 under test; the first annular conductor 10 and the tested lead 20 form an inductive capacitor to sense the leakage voltage of the tested lead 20.
Wherein the tested lead 20 can be electrically connected to a position to be tested of the electrical appliance, for example, a housing of the electrical appliance. The tested wire 20 includes a core 21 and a surface insulation layer 22. A capacitor is defined as two conductors in close proximity to each other with a layer of insulating medium sandwiched between them. In the embodiment of the present invention, the lead wire 20 to be measured and the first annular conductor 10 are two conductors close to each other, and a medium such as air or a surface insulating layer 22 between the lead wire 20 to be measured and the first annular conductor 10 is an insulating medium sandwiched between the conductors.
Illustratively, the tested lead 20 is connected to a to-be-detected position (e.g., a housing) of the water heater, and when the water heater leaks electricity, an alternating voltage of 220V of the mains electricity is transmitted to the to-be-detected position of the water heater, and the alternating voltage is transmitted through the tested lead 20, and a variable voltage is generated on the tested lead 20 and is coupled to the first annular conductor 10. Therefore, the voltage variation on the wire 20 to be tested can be detected by detecting the voltage on the first loop conductor 10, thereby detecting the leakage current at the position to be tested. It can be seen that the embodiment of the present invention only needs to provide a signal connection terminal on the first annular conductor 10 to output the voltage signal on the first annular conductor 10.
In the embodiment of the invention, the first annular conductor 10 is arranged around the tested lead 20, and the first annular conductor 10 and the tested lead 20 form the induction capacitor which can induce leakage voltage, namely, whether the position to be tested is electrified is detected by adopting a non-electric contact method. That is, the embodiment of the present invention can detect the leakage even if the user does not get an electric shock by the leakage voltage. Compared with the technical scheme of detecting the electric leakage by detecting the electric leakage current in the prior art, the embodiment of the invention can detect the electric leakage before a user gets an electric shock, so that the embodiment of the invention has higher reliability on the electric leakage induction. In addition, the leakage sensing element provided by the embodiment of the invention has a simple structure and is low in cost. In conclusion, the embodiment of the invention improves the reliability of leakage inductance on the basis of lower cost, and is easy to realize.
On the basis of the above embodiments, optionally, the outer diameter of the surface insulating layer 22 is equal to the inner diameter of the first annular conductor 10, i.e. the first annular conductor 10 is closer to the wire core 21. By the arrangement, on the premise of meeting the insulation requirement, the voltage coupling degree of the first annular conductor 10 is increased, and the sensitivity of the induction capacitance induction voltage formed by the tested lead 20 and the first annular conductor 10 is increased.
Fig. 2 is a schematic structural diagram of another electric leakage sensing element according to an embodiment of the present invention. Referring to fig. 2, on the basis of the above embodiments, optionally, the leakage inductance element further includes a second annular conductor 30, and the second annular conductor 30 is located at the periphery of the first annular conductor 10; the second annular conductor 30 is disposed spaced apart from the first annular conductor 10. The second annular conductor 30 is used for shielding the interference of an external circuit to the first annular conductor 10, so that the first annular conductor 10 is prevented from being interfered by electrical signals of other circuits, the voltage induced on the first annular conductor 10 is only the voltage on the tested wire 20, and the reliability of the leakage inductance induction is further improved.
In one embodiment of the present invention, optionally, the second annular conductor 30 is disposed in a floating manner, and the second annular conductor 30 does not need to be connected to other circuit structures, so as to simplify the circuit structure.
In one embodiment of the present invention, optionally, the second annular conductor 30 is electrically connected to the neutral line, or the second annular conductor 30 is electrically connected to digital ground of the leakage control circuit, or the second annular conductor 30 is electrically connected to analog ground of the leakage control circuit. The arrangement of the embodiment of the invention can keep the electric potential of the second annular conductor 30 constant, and enhance the shielding effect of the second annular conductor 30 on other circuit electric signals.
With continued reference to fig. 2, based on the above embodiments, the leakage inductance element optionally further includes an insulating support 40, and the insulating support 40 supports the first annular conductor 10 and the second annular conductor 30. The material of the insulating support 40 may be, for example, an insulating material such as plastic or rubber, and the first annular conductor 10 and the second annular conductor 30 are respectively fixed on the insulating support 40. The arrangement of the embodiment of the invention avoids the contact between the first annular conductor 10 and the second annular conductor 30, so that the second annular conductor 30 is reliably insulated from the first annular conductor 10, and the reliability of induced leakage of the leakage inductance element is improved.
It should be noted that the insulating support 40 is exemplarily shown to support the first annular conductor 10 and the second annular conductor 30 in the above embodiments, and the invention is not limited thereto. In other embodiments, the insulating support 40 may be configured to support only the second annular conductor 30, and may be configured as required in practical applications.
With continued reference to fig. 2, in an embodiment of the present invention, optionally, the insulating support 40 includes a ring support 41 and rod supports 42 located at two sides of the ring support 41, wherein the ring support 41 is hollow in the center for passing through the measured lead 20, and the rod supports 42 are used for fixing the first ring conductor 10 and/or the second ring conductor 30. The embodiment of the invention is arranged to fix the positions of the tested lead 20 and the first and second annular conductors 10 and 30, so that the distance between the tested lead 20 and the first annular conductor 10 can be kept constant, and the distance between the first and second annular conductors 10 and 30 can be kept constant, thereby enhancing the stability of the first annular conductor 10 in inducing leakage voltage.
Fig. 3 is a schematic structural diagram of another leakage inductance element according to an embodiment of the present invention. Referring to fig. 3, on the basis of the above embodiments, optionally, the number of the first annular conductors 10 is multiple, and the multiple first annular conductors 10 respectively surround different positions of the measured lead 20. The voltage detection device provided by the embodiment of the invention can detect the voltage of different positions of the detected lead 20, and avoids the detection error caused by only adopting one first annular conductor 10, thereby improving the accuracy of detecting the leakage voltage by the leakage inductance element.
It should be noted that, in the above embodiments, the inner diameters of the plurality of first annular conductors 10 are all the same, which is not a limitation of the present invention. In other embodiments, the inner diameters of the first annular conductors 10 may be different, and may be set as required in practical applications. Alternatively, if the inner diameters of the plurality of first annular conductors 10 are different in size, the capacitance between the first annular conductors 10 and the measured lead 20 is different in size. The reference point of the leakage inductance induced voltage generated by the plurality of first annular conductors 10 may be the same reference point, and specifically may be a zero line, or a digital ground of the leakage control circuit, or an analog ground of the leakage control circuit. It is also possible to set the reference point of the first loop conductor 10 having a larger capacitance as the first loop conductor 10 having a smaller capacitance. By the arrangement, when the zero line, the digital ground of the leakage control circuit and the analog ground of the leakage control circuit are impure, the first annular conductor 10 with the smaller capacitance is selected as the reference point, so that a differential signal is generated between the first annular conductor 10 with the larger capacitance and the first annular conductor 10 with the smaller capacitance, and the accuracy of detecting the leakage voltage is improved.
On the basis of the above embodiments, the tested lead 20 optionally includes a protective earth wire. The protective earth wire is necessary for I-type electric appliances, and is connected with the shell of the electric appliance to lead out electric leakage of the electric appliance. According to the embodiment of the invention, the leakage detection of the electric appliance is carried out without additionally arranging a tested lead, so that the circuit structure is simplified, and the cost is reduced.
The embodiment of the invention also provides a leakage detection circuit. Fig. 4 is a circuit schematic diagram of a leakage detection circuit according to an embodiment of the present invention. Referring to fig. 4, the leakage detecting circuit includes: a leakage control circuit 1 and a leakage inductance element 2 as provided in any of the embodiments of the present invention, the leakage control circuit 1 being electrically connected to the first annular conductor, the leakage control circuit 1 being configured to generate a leakage protection signal based on a leakage inductance voltage generated by the received detection conductor and the reference point. Wherein the reference point may be a zero line, or a digital ground of the leakage control circuit 1, or an analog ground of the leakage control circuit 1. The leakage detection circuit provided by the embodiment of the present invention includes the leakage inductance element 2 provided by any embodiment of the present invention, and the technical principle and the generated effect are similar and will not be described again.
On the basis of the foregoing embodiments, optionally, the leakage detecting circuit further includes a detection circuit, the detection circuit is electrically connected between the first annular conductor and the leakage control circuit, and the detection circuit is configured to perform signal processing on the received leakage induced voltage on the first annular conductor. Illustratively, the detection circuit includes an amplifier to amplify the voltage induced on the first loop conductor. The detection circuit is arranged in the embodiment of the invention, so that the voltage signal induced on the first annular conductor can be clearer, and the processed induced voltage signal can be directly input into the post-stage circuit.
The embodiment of the invention also provides the water heater. Fig. 5 is a schematic structural diagram of a water heater according to an embodiment of the present invention. Referring to fig. 5, the water heater includes: the technical principle and the resulting effect of the leakage detection circuit 100 provided in any embodiment of the present invention are similar, and are not described again.
With continued reference to fig. 5, in one embodiment of the present invention, optionally, the leakage inductance element in the leakage detection circuit 100 surrounds the protective ground of the water heater; alternatively, the leakage inductance element surrounds a wire that is electrically connected to the outer shell 200 of the water heater. Illustratively, the hidden power utilization danger of the water heater comprises that the water heater does not leak electricity and a protective earth wire electrically connected with the water heater is electrified; or the water heater leaks electricity, the socket or the protection in the building is not well grounded, and the electricity leakage of the water heater cannot be led away; or the inner container of the water heater leaks electricity, and the inner container of the water heater is connected with the shell 200 through a resistor. According to the embodiment of the invention, the leakage inductance element surrounds the protection ground of the water heater or the lead electrically connected with the shell 200, so that whether the protection ground or the shell 200 of the water heater leaks electricity or not can be detected, and whether the inner container of the water heater is electrified or not can be detected through the resistor, and the potential electric leakage hazard of the water heater is avoided.
The embodiment of the invention also provides the water heater. This water heater includes: the technical principle and the effect of the leakage inductance element provided by any embodiment of the invention are similar, and are not described in detail.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (12)
1. A leakage inductance component, comprising:
a first annular conductor surrounding a wire under test; the first annular conductor and the tested lead form an induction capacitor to induce the leakage voltage of the tested lead.
2. The leakage inductance component of claim 1, wherein said first loop conductor is plural in number, and said plural first loop conductors surround said measured conductor at different positions, respectively.
3. A leakage inductance component as claimed in claim 2, wherein the inner diameters of a plurality of said first annular conductors are of different sizes.
4. A leakage inductance component as claimed in claim 1, wherein said conductor under test includes a surface insulation layer; the outer diameter of the surface insulating layer is equal to the inner diameter of the first annular conductor.
5. A leakage inductance component as claimed in claim 1, further comprising: a second annular conductor located peripherally to the first annular conductor; the second annular conductor is spaced apart from the first annular conductor.
6. The leakage inductance component of claim 5, wherein said second annular conductor is electrically connected to a neutral line, or said second annular conductor is digitally electrically connected to a control circuit, or said second annular conductor is analog electrically connected to a control circuit.
7. A leakage inductance component as claimed in claim 5, further comprising an insulating support; the insulating support supports the second annular conductor;
alternatively, the insulating support supports the first and second annular conductors.
8. A leakage inductance component as claimed in claim 1, wherein said conductor under test includes a protective ground.
9. A water heater, comprising: a leakage inductance element as claimed in any one of claims 1 to 8.
10. An electrical leakage detection circuit, comprising: a leakage control circuit electrically connected to the first annular conductor, the leakage control circuit configured to generate a leakage protection signal based on a received leakage induction voltage generated by the first annular conductor and a reference point, and the leakage induction element of any one of claims 1-8.
11. The electrical leakage detection circuit of claim 10, further comprising a detection circuit electrically connected between the first annular conductor and the electrical leakage control circuit, the detection circuit configured to perform signal processing on the received induced voltage of electrical leakage on the first annular conductor.
12. A water heater, comprising: the leakage detection circuit according to any one of claims 10 or 11.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010135507.3A CN113341337A (en) | 2020-03-02 | 2020-03-02 | Leakage inductance element, leakage detection circuit and water heater |
| PCT/CN2020/135073 WO2021174937A1 (en) | 2020-03-02 | 2020-12-10 | Electric leakage sensing element, electric leakage detection circuit, and water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010135507.3A CN113341337A (en) | 2020-03-02 | 2020-03-02 | Leakage inductance element, leakage detection circuit and water heater |
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| Publication Number | Publication Date |
|---|---|
| CN113341337A true CN113341337A (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010135507.3A Pending CN113341337A (en) | 2020-03-02 | 2020-03-02 | Leakage inductance element, leakage detection circuit and water heater |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113341337A (en) |
| WO (1) | WO2021174937A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359059A (en) * | 2020-03-02 | 2021-09-07 | 青岛经济技术开发区海尔热水器有限公司 | Leakage inductance element, leakage detection circuit and water heater |
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| CN103823112A (en) * | 2014-02-20 | 2014-05-28 | 中国北方车辆研究所 | Insulation resistance detecting device for high-voltage circuit |
| CN205509469U (en) * | 2016-03-09 | 2016-08-24 | 浙江公认电气有限公司 | Intelligent electric leakage comprehensive protector |
| CN106019194A (en) * | 2016-06-29 | 2016-10-12 | 张家港友诚科技机电有限公司 | Test method for electric leakage detection circuit |
| CN108761168A (en) * | 2017-03-03 | 2018-11-06 | 韦里斯产业有限责任公司 | Non-contact voltage transducer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200990261Y (en) * | 2006-10-25 | 2007-12-12 | 上海益而益电器制造有限公司 | Electric source line with electricity leakage detecting conductor |
| CN203117345U (en) * | 2013-02-01 | 2013-08-07 | 西安秦骊成套电器有限公司 | Circuit detecting grounding state of operating cable via high-frequency signal injection |
| JP6343984B2 (en) * | 2014-03-13 | 2018-06-20 | オムロン株式会社 | Non-contact voltage measuring device |
| US9778294B2 (en) * | 2014-08-08 | 2017-10-03 | Iida Electronics Co., Ltd. | Non-contact AC voltage measurement device |
| JP6964598B2 (en) * | 2016-11-15 | 2021-11-10 | 株式会社日立製作所 | Non-contact voltage measuring device and diagnostic system |
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2020
- 2020-03-02 CN CN202010135507.3A patent/CN113341337A/en active Pending
- 2020-12-10 WO PCT/CN2020/135073 patent/WO2021174937A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823112A (en) * | 2014-02-20 | 2014-05-28 | 中国北方车辆研究所 | Insulation resistance detecting device for high-voltage circuit |
| CN205509469U (en) * | 2016-03-09 | 2016-08-24 | 浙江公认电气有限公司 | Intelligent electric leakage comprehensive protector |
| CN106019194A (en) * | 2016-06-29 | 2016-10-12 | 张家港友诚科技机电有限公司 | Test method for electric leakage detection circuit |
| CN108761168A (en) * | 2017-03-03 | 2018-11-06 | 韦里斯产业有限责任公司 | Non-contact voltage transducer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359059A (en) * | 2020-03-02 | 2021-09-07 | 青岛经济技术开发区海尔热水器有限公司 | Leakage inductance element, leakage detection circuit and water heater |
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| WO2021174937A1 (en) | 2021-09-10 |
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