Current measurement system

Abstract

The invention provides a current measuring system which comprises an illuminometer, an intermediate medium, a light-emitting device and two electric wires to be measured. The two to-be-tested electric wires are respectively connected with two ends of the light-emitting equipment to form a closed-loop circuit; the intermediate medium is parallel to the light-emitting equipment, and a detection head of the illuminometer is arranged on the other side of the intermediate medium; and obtaining the current intensity of the wire to be measured according to the illumination intensity measured by the illuminometer. Through the current measurement system, non-contact current intensity measurement of the to-be-measured wire can be realized.

Description

Technical Field

[0001] The present invention relates to the field of power grids, and in particular to a current measurement system. Background Art

[0002] Conventional current measurement typically relies on an external ammeter, which requires physical access to the current transmission line being measured (e.g., disconnecting the line and connecting the meter in series). However, this measurement method has significant limitations: for fixed line enclosures (such as sealed wiring harnesses and embedded cables) or line segments without pre-configured dedicated measurement access ports, the lack of safe and convenient physical access makes it difficult or even impossible to obtain accurate current parameters for that line segment. Summary of the Invention

[0003] Based on this, the present invention provides a current measurement system, which indirectly measures the current intensity of the current transmission line through the light intensity collected by the illuminance meter, thereby realizing non-contact measurement of current parameters.

[0004] The present invention provides a current measurement system, which includes: an illuminometer, an intermediate medium, a light-emitting device, and two wires to be measured;

[0005] The two wires to be tested are respectively connected to two ends of the light emitting device to form a closed loop circuit;

[0006] The intermediate medium is arranged in parallel with the light emitting device, and the detection head of the illuminometer is arranged on the other side of the intermediate medium;

[0007] The current intensity of the wire to be tested is obtained according to the light intensity measured by the illuminometer.

[0008] Furthermore, the intermediate medium includes a first intermediate medium and a second intermediate medium;

[0009] The first intermediate medium is a metal intermediate medium;

[0010] The second intermediate medium includes plastic, rubber or wood board.

[0011] Furthermore, the projection area of ​​the intermediate medium is much larger than the illumination area of ​​the light emitting device.

[0012] Furthermore, the light emitting device is a fluorescent lamp including a ballast.

[0013] Furthermore, the illuminometer is an MT-8210 illuminometer.

[0014] Furthermore, the current intensity of the wire to be tested is obtained according to the light intensity measured by the illuminometer, specifically:

[0015] ,

[0016] in, The standard for illuminance meters is to measure light intensity. is the measured light intensity at the time of measurement by the illuminometer, is the standard current of the wire to be tested, is the current of the wire under test at the moment of measurement.

[0017] The beneficial effects of adopting the above technical solution are as follows: the current measurement system proposed in this embodiment utilizes the linear proportional relationship between the hidden light intensity of the light-emitting device on the current transmission line and the current intensity on the current transmission line, and measures the hidden light intensity of the light-emitting device on the current transmission line by an illuminance meter to obtain the current intensity, thereby realizing non-contact measurement of the current of the current transmission line, which is more conducive to real-time measurement of the current intensity of the current transmission line. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments or the prior art.

[0019] Figure 1 This is a schematic diagram of a current measurement system in one embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of the present invention, and are not intended to be exhaustive. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention. To further illustrate the present invention, the current measurement system provided by the present invention will be described in detail below, in conjunction with the accompanying drawings.

[0021] Unless otherwise defined, the technical or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which the invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] Conventional current measurement typically relies on an external ammeter, which requires physical access to the current transmission line being measured (e.g., disconnecting the line and connecting the meter in series). However, this measurement method has significant limitations: for fixed line enclosures (such as sealed wiring harnesses and embedded cables) or line segments without pre-configured dedicated measurement access ports, the lack of safe and convenient physical access makes it difficult or even impossible to obtain accurate current parameters for that line segment.

[0023] Based on this, combined with the Figure 1 As shown in the schematic diagram of the current measurement system, this embodiment provides a current measurement system that measures the light intensity of the light-emitting device on the current transmission line to obtain the current intensity on the current transmission line in a non-contact manner.

[0024] The present invention provides a current measurement system, which includes: an illuminometer 100, an intermediate medium 200, a light emitting device 300 and two wires to be measured 400;

[0025] The two wires to be tested 400 are respectively connected to the two ends of the light emitting device 300 to form a closed loop circuit;

[0026] The intermediate medium 200 is arranged in parallel with the light emitting device 300, and the detection head of the illuminometer 100 is arranged on the other side of the intermediate medium 200;

[0027] The current intensity of the tested wire 400 is obtained according to the light intensity measured by the illuminometer 100 .

[0028] The light emitting device 300 is connected to a high voltage AC power supply via two test wires 400. The high voltage AC power supply is connected to a 220 kV test wire circuit via a transformer. The high voltage AC power supply discussed in this embodiment is a high voltage AC power supply of 600 kV or higher.

[0029] It should be noted that the realization of the technical solution of this application is based on the positive proportional relationship between the light intensity measurement result of the illuminance meter and the current intensity flowing through the light emitting device after the light source of the light emitting device connected to the wire is blocked. Figure 1 In the illustrated circuit design, an intermediate medium is positioned parallel to the light-emitting device. The intermediate medium is made of an opaque material, designed to block light from the light-emitting device from reaching the illuminometer's probe. Taking into account the wave-particle duality of light, the projected area of ​​the intermediate medium in this embodiment is significantly larger than the illuminated area of ​​the light-emitting device, preventing the light waves from the light-emitting device from directly or indirectly reaching the illuminometer's probe. Furthermore, to ensure that the light waves from the light-emitting device cannot directly reach the illuminometer's probe, the light-emitting device can be wrapped in an opaque material (such as black opaque fabric). To further enhance the light-wave blocking effect of the light-emitting device, this embodiment further limits the spacing between the intermediate medium, the light-emitting device, and the illuminometer's probe. The greater the current flowing through the light-emitting device, the larger the spacing between the intermediate medium, the light-emitting device, and the illuminometer's probe.

[0030] In particular, considering that the optical and physical properties of different materials have different truncation effects on light propagation, the intermediate medium in this embodiment includes a first intermediate medium and a second intermediate medium; the first intermediate medium is a metal intermediate medium, such as a 0.2 cm thick aluminum plate, copper plate, stainless steel plate, etc.; the second intermediate medium includes plastic (such as a black plastic plate that is opaque to visible light), rubber, or wood, such as a 0.3 cm thick wood plate, an opaque rubber plate, etc.

[0031] In this embodiment, the light emitting device is a fluorescent lamp including a ballast.

[0032] Furthermore, the illuminometer is an MT-8210 illuminometer.

[0033] Furthermore, the current intensity of the wire to be tested is obtained according to the light intensity measured by the illuminometer, specifically:

[0034] ,

[0035] in, The standard for illuminance meters is to measure light intensity. is the measured light intensity at the time of measurement by the illuminometer, is the standard current of the wire to be tested, The current of the wire to be tested at the time of measurement is the current of the wire to be tested at the time of measurement. In this embodiment, the light intensity measured by the illuminance meter at a certain time is arbitrarily selected as the standard light intensity measured by the illuminance meter. , and the current of the wire to be tested at that moment is recorded as the standard current of the wire to be tested ; You can also arbitrarily select the average value of the light intensity measured by the illuminance meter at multiple times as the standard light intensity measurement of the illuminance meter The average current value of the wire under test corresponding to the above multiple moments is used as the standard current value of the wire under test. .

[0036] Under the condition that the voltage of the control measurement line remains unchanged, Figure 1 The circuit structure was repeatedly tested. By adding light-emitting devices in series and adjusting the input current, the relationship between the light intensity measured by the illuminance meter and the current intensity of the measured wire was obtained as follows:

[0037]

[0038] The light-emitting device described in the experimental data is a 20W LED bulb. The negative light intensity value indicates only the direction of light intensity opposite to the positive value on the MT-8210 illuminometer and has nothing to do with the actual light intensity. Because light-emitting devices are nonlinear components, multiple experiments conducted on high-voltage AC circuits (220kV, 3000kV, 4000kV, 6000kV, and 8000kV) revealed that, when the power supply power is below the rated value, increasing the number of light-emitting devices in series increases the current intensity of the tested wire. This change is particularly pronounced in high-voltage circuits.

[0039] It should be noted that the current measurement system of this embodiment measures light intensity by taking into account that the current intensity of the test wire is related to the intensity of a certain invisible hidden light in the light-emitting device connected to the test wire, and the relationship is linearly proportional. This embodiment utilizes this experimental phenomenon to perform non-contact measurement of the current intensity of the test wire, so that the current intensity change of the test wire can be detected without the need for an external ammeter. This is very meaningful for observing the phenomenon of sudden or unstable current intensity in household circuits.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A current measurement system, characterized in that: The current measurement system includes: an illuminometer, an intermediate medium, a light emitting device and two wires to be measured; The two wires to be tested are respectively connected to two ends of the light emitting device to form a closed loop circuit; The intermediate medium is arranged in parallel with the light emitting device, and the detection head of the illuminometer is arranged on the other side of the intermediate medium; The current intensity of the wire to be tested is obtained according to the light intensity measured by the illuminometer.

2. The current measurement system according to claim 1, wherein: The intermediate medium includes a first intermediate medium and a second intermediate medium; The first intermediate medium is a metal intermediate medium; The second intermediate medium includes plastic, rubber or wood board.

3. The current measurement system according to claim 2, wherein: The projection area of ​​the intermediate medium is much larger than the illumination area of ​​the light emitting device.

4. The current measurement system according to claim 3, wherein: The lighting device is a fluorescent lamp including a ballast.

5. The current measurement system according to claim 4, wherein: The illuminometer is an MT-8210 illuminometer.

6. The current measurement system according to claim 5, wherein: The current intensity of the wire to be tested is obtained according to the light intensity measured by the illuminometer, specifically: , in, The standard for illuminance meters is to measure light intensity. is the measured light intensity at the time of measurement by the illuminometer, is the standard current of the wire to be tested, is the current of the wire under test at the moment of measurement.

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