CN109975595B - Leakage current sensor and device for resisting interference of power frequency magnetic field - Google Patents
Leakage current sensor and device for resisting interference of power frequency magnetic field Download PDFInfo
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- CN109975595B CN109975595B CN201910276420.5A CN201910276420A CN109975595B CN 109975595 B CN109975595 B CN 109975595B CN 201910276420 A CN201910276420 A CN 201910276420A CN 109975595 B CN109975595 B CN 109975595B
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The disclosure provides a leakage current sensor and a device for resisting power frequency magnetic field interference. The leakage current sensor resisting power frequency magnetic field interference comprises a current mutual inductance coil module, a current mutual inductance coil module and a current mutual inductance coil module, wherein the current mutual inductance coil module comprises a first induction coil and a second induction coil which are arranged in parallel in the horizontal direction, and the placing postures, the winding directions and the turns of the first induction coil and the second induction coil are all consistent; the output ends of the first induction coil and the second induction coil are reversely connected to the acquisition module; and the acquisition module comprises a processor, and the processor is used for receiving the current signals output by the first induction coil and the second induction coil and accumulating the two current signals to obtain a leakage current value.
Description
Technical Field
The utility model belongs to leakage current sensor field especially relates to an anti power frequency magnetic field interference's leakage current sensor and device.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Many devices in the power grid need to collect weak leakage current, such as transformers, lightning arresters and the like, and the insulation condition of the devices is reflected through the magnitude of the leakage current. The power grid has high operating voltage level and large current, a strong power frequency electromagnetic field exists in the power grid operating environment, but the leakage current is often milliampere or microampere level and is easily interfered by the power frequency electromagnetic field.
Disclosure of Invention
In order to solve the above problem, a first aspect of the present disclosure provides a leakage current sensor resisting interference of a power frequency magnetic field, in which an induction coil generating two electric potentials with opposite phases is used to form the leakage current sensor, so as to ensure that a sum of voltage phasors of an external magnetic field at the two coils is always zero, and external interference is cancelled to zero by a double-coil connection manner, so that leakage current passing through a cable of the induction coil can be accurately measured.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a leakage current sensor resistant to interference from power frequency magnetic fields, comprising:
the current mutual inductance coil module comprises a first induction coil and a second induction coil, wherein the first induction coil and the second induction coil are installed in parallel in the horizontal direction, and the placing postures, the winding directions and the turns of the first induction coil and the second induction coil are all consistent; the output ends of the first induction coil and the second induction coil are reversely connected to the acquisition module;
and the acquisition module comprises a processor, and the processor is used for receiving the current signals output by the first induction coil and the second induction coil and accumulating the two current signals to obtain a leakage current value.
In order to solve the above problems, a second aspect of the present disclosure provides a leakage current detecting apparatus, which includes an induction coil generating two electric potentials with opposite phases to form a leakage current sensor, so that the sum of voltage phasors of an external magnetic field at the two coils is always zero, and external interference is cancelled to zero by a double-coil connection manner, that is, a leakage current passing through a cable of the induction coil can be accurately measured.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a leakage current detection device comprises the leakage current sensor resisting the interference of the power frequency magnetic field.
The beneficial effects of this disclosure are:
the leakage current sensor disclosed by the invention is formed by the induction coils which generate two electric potentials with opposite phases, the sum of voltage phasors of an external magnetic field at the two coils is always zero, external interference is offset to be zero through a double-coil connection mode, and the leakage current passing through the cable of the induction coil can be accurately measured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic diagram of a leakage current sensor resistant to interference of a power frequency magnetic field according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a leakage current sensor resistant to interference of a power frequency magnetic field according to an embodiment of the present disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
As shown in fig. 1 and fig. 2, the leakage current sensor against the interference of the power frequency magnetic field of the present embodiment includes:
the current mutual inductance coil module comprises a first induction coil and a second induction coil, wherein the first induction coil and the second induction coil are installed in parallel in the horizontal direction, and the placing postures, the winding directions and the turns of the first induction coil and the second induction coil are all consistent; the output ends of the first induction coil and the second induction coil are reversely connected to the acquisition module;
as shown in fig. 2, the first induction coil a and the second induction coil B are identical in placement posture, winding direction and number of turns, and the outlet end a1 of the first induction coil a is connected with the outlet end B2 of the second induction coil B; the outlet terminal A2 of the first induction coil A is connected with the outlet terminal B1 of the second induction coil B.
And the acquisition module comprises a processor, and the processor is used for receiving the current signals output by the first induction coil and the second induction coil and accumulating the two current signals to obtain a leakage current value.
Specifically, the principle of the leakage current sensor of the present embodiment for resisting the interference of the power frequency magnetic field is a dual-coil principle, and the analysis is as shown in fig. 1, where:
1) i: the interference index of the interference source generated by the equipment is A/m (ampere/meter).
2) L1; a first induction coil.
3) L2: a second induction coil.
4) R1: a first induction coil winding.
5) R2: a second induction coil winding.
6) i: a collected leakage current is required.
When the two induction coils are at a preset distance (for example, 5cm) and placed in the same posture, the two induction coils can be in the same strong electromagnetic environment according to the situation that the two induction coils are in the same strong electromagnetic environment and nearby strong magnetic interference occurs, voltages V1 and V2 are respectively induced on the two coil windings, R1 and R2 adopt a mode of opposite outgoing lines, two electric potentials with opposite phases can be generated, the two electric potentials are respectively connected into the acquisition module, therefore, the phasor sum of each time point V1 and V2 is always zero, namely, the voltage phasor sum of the two coils of an external magnetic field is always zero, the external interference is offset to be zero through a double-coil connection mode, and the leakage current passing through the second induction coil cable can be accurately measured.
The working mode of the leakage current sensor of the present embodiment is as follows: and a double-coil structure is adopted for online acquisition of leakage current of the lightning arrester.
This embodiment has realized the anti power frequency magnetic field of arrester leakage current sensor and has disturbed the function.
In one embodiment, the first induction coil and the second induction coil are both in a fully closed structure.
The induction coil in the leakage current sensor of the embodiment is of a fully closed structure, shielding is enhanced, and the anti-interference capability is improved.
In one embodiment, the acquisition module is further connected to the wireless communication module.
It should be noted that the wireless communication module includes, but is not limited to, an LoRa wireless communication module.
As an implementation mode, the acquisition module and the wireless communication module are both connected with the power supply module.
It should be noted that the power supply module includes, but is not limited to, a lithium battery.
The leakage current sensor of the embodiment is composed of the induction coils which generate two electric potentials with opposite phases, the sum of voltage phasors of an external magnetic field at the two coils is always zero, external interference is offset to be zero through a double-coil connection mode, and leakage current passing through a cable of the induction coil can be accurately measured.
In another embodiment, a leakage current detection device is also provided, which comprises a leakage current sensor resistant to interference of power frequency magnetic fields as shown in fig. 1 and fig. 2.
The installation mode of the leakage current sensor resisting the interference of the power frequency magnetic field as shown in the figures 1 and 2 is as follows: and (4) disassembling the bolt of the grounding wire, penetrating the grounding flat iron through the acquisition unit, and then screwing the bolt.
The leakage current sensor resisting the interference of the power frequency magnetic field, which is shown in the figures 1 and 2, is powered by a battery, does not need wiring, and is convenient and quick to construct.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (5)
1. A leakage current sensor resistant to interference from power frequency magnetic fields, comprising:
the current mutual inductance coil module comprises a first induction coil and a second induction coil, wherein the first induction coil and the second induction coil are installed in parallel in the horizontal direction, and the placing postures, the winding directions and the turns of the first induction coil and the second induction coil are all consistent; the output ends of the first induction coil and the second induction coil are reversely connected to the acquisition module; the two induction coils with opposite phases of electric potential ensure that the sum of voltage phasors of an external magnetic field in the two coils is always zero, external interference is offset to zero in a double-coil connection mode, and then leakage current passing through a cable of the induction coil can be accurately measured;
the acquisition module comprises a processor, wherein the processor is used for receiving current signals output by the first induction coil and the second induction coil and accumulating the two current signals to obtain a leakage current value;
when the two induction coils are at a preset distance and are placed in the same posture, the induction coils are in the same strong electromagnetic environment, and when nearby strong magnetic interference occurs, voltages V1 and V2 are respectively induced on the two coil windings, R1 and R2 adopt a mode of opposite outgoing lines to generate two electric potentials with opposite phases, the two electric potentials are respectively connected into the acquisition module, the phasor sum of V1 and V2 is always zero at each time point, namely the voltage phasor sum of the two coils of an external magnetic field is always zero, the external interference is offset to zero through a double-coil connection mode, and the leakage current passing through a second induction coil cable can be accurately measured;
the first induction coil and the second induction coil are of a fully closed structure;
the acquisition module is also connected with the wireless communication module.
2. The leakage current sensor of claim 1, wherein the wireless communication module is a LoRa wireless communication module.
3. The leakage current sensor of claim 2, wherein the acquisition module and the wireless communication module are both connected to a power supply module.
4. The industrial frequency magnetic field interference resistant leakage current sensor of claim 3, wherein the power supply module is a lithium battery and supplies power to the acquisition module and the wireless communication module.
5. A leakage current detection device comprising the leakage current sensor against interference of a power frequency magnetic field according to any one of claims 1 to 4.
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| CN201910276420.5A CN109975595B (en) | 2019-04-08 | 2019-04-08 | Leakage current sensor and device for resisting interference of power frequency magnetic field |
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| CN109975595B true CN109975595B (en) | 2020-11-06 |
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| CN111157775A (en) * | 2019-11-20 | 2020-05-15 | 江苏轶一电力科技有限公司 | Double-coil current sensor |
| CN111913127B (en) * | 2020-06-29 | 2023-05-16 | 中铁第一勘察设计院集团有限公司 | Intelligent detection device and method for tubular bus |
| CN111880123B (en) * | 2020-07-21 | 2022-10-25 | 华北电力大学 | Method for detecting frequency response signal of transformer winding resisting power frequency magnetic saturation |
| CN115226010B (en) * | 2022-09-07 | 2023-02-17 | 荣耀终端有限公司 | Anti-magnetic interference structure and electronic equipment |
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| ES2274724B1 (en) * | 2005-11-08 | 2007-12-01 | Zertan, S.A. | DISTURBATION ELIMINATION SYSTEM FOR INDUCTIVE SENSORS. |
| US8649193B2 (en) * | 2010-04-05 | 2014-02-11 | Mitsubishi Electric Corporation | Leakage current reducing apparatus |
| CN104714070A (en) * | 2013-12-13 | 2015-06-17 | 广东四会互感器厂有限公司 | Current sensor adopting differential coil structure |
| CN203720243U (en) * | 2014-02-13 | 2014-07-16 | 国家电网公司 | Anti-interference device for arrester leakage current detection |
| CN205103296U (en) * | 2015-09-23 | 2016-03-23 | 厦门红相电力设备股份有限公司 | Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester |
| CN205103356U (en) * | 2015-09-23 | 2016-03-23 | 厦门红相电力设备股份有限公司 | Use soft -magnetic piece as core to faint acquisition unit who reveals current signal of non -contact |
| CN106569025A (en) * | 2015-10-08 | 2017-04-19 | 云辰电子开发股份有限公司 | Device of measuring power consumption, device and method of measuring power supply status in non-contact manner |
| CN107192973A (en) * | 2017-05-27 | 2017-09-22 | 中国电力科学研究院 | Leakage current of an arrester compensation system and method under a kind of electric field environment |
| CN107345979B (en) * | 2017-08-29 | 2020-05-05 | 国家电网公司 | Insulator leakage current on-line monitoring system |
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