A temperature-compensated current transformer, an electrical equipment detection system and method

Abstract

The present invention discloses a temperature-compensated current transformer, an electrical equipment detection system and method, and relates to the field of electrical equipment detection. The temperature-compensated current transformer comprises an iron core, which is in a ring shape; a conductive optical fiber, which is evenly wound on the iron core; a transfer terminal, which is respectively connected to the two ends of the conductive optical fiber; the conductive optical fiber comprises a core, a cladding, a metal layer and an insulating layer arranged in sequence from the inside to the outside, and the refractive index of the core is greater than the refractive index of the cladding; the transfer terminal comprises a hollow cylinder, a cavity is formed inside the hollow cylinder, and the inner wall of the hollow cylinder cooperates with the outer wall of the metal layer. The present invention adopts a temperature-compensated current transformer, considers the influence of temperature on the collected current, and performs real-time temperature compensation on the sensed current, thereby improving the collection accuracy of the electrical equipment current data.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment detection, and particularly to a temperature-compensated current transformer, an electrical equipment detection system and a method. Background Art

[0002] In the fields of electric power, electronics, communication, etc., the condition monitoring and maintenance of electrical equipment are crucial. Traditional condition detection of electrical equipment mainly relies on externally installed current transformers and manual inspections. For the acquisition of supply current, the influence of temperature is often ignored, resulting in problems such as poor real-time performance, large measurement errors, and high costs. When evaluating the condition of electrical equipment, only the acquisition of supply current is involved, the data is single, the internal detection of the equipment is lacking, and an accurate evaluation of the operating state of the electrical equipment cannot be made. In addition, the real-time performance is poor, and when the data is abnormal, the user cannot be timely reminded to perform corresponding maintenance and processing. Summary of the Invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention is proposed.

[0004] The first object of the present invention is to provide a temperature-compensated current transformer, which can take into account the influence of temperature on the collected current and perform real-time temperature compensation on the sensed current, thereby improving the acquisition accuracy of electrical equipment current data.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A temperature-compensated current transformer includes a core having an annular shape; a conductive optical fiber uniformly wound around the core; and adapter terminals respectively connected to both ends of the conductive optical fiber. The conductive optical fiber includes a core, a cladding, a metal layer, and an insulating layer sequentially arranged from the inside to the outside, and the refractive index of the core is greater than that of the cladding. The adapter terminal includes a hollow cylinder, and a cavity is formed inside the hollow cylinder, and the inner wall of the hollow cylinder cooperates with the outer wall of the metal layer.

[0006] As a preferred solution of the temperature-compensated current transformer of the present invention, a first limiting ring, a second limiting ring, a lens group, and a window are further provided in the cavity of the hollow cylinder. The first limiting ring abuts against the metal layer of the conductive optical fiber, the lens group is disposed between the first limiting ring and the second limiting ring, and the window closely adheres to the first limiting ring and the second limiting ring and is close to the side of the lens group.

[0007] As a preferred solution of the temperature-compensated current transformer of the present invention, a wiring terminal is further provided outside the hollow cylinder, and the wiring terminal is connected to the first limiting ring through a wire, and the wire is disposed inside the hollow cylinder.

[0008] As a preferred embodiment of the temperature compensation type current transformer of the present invention, wherein: the metal layer includes an inner layer and an outer layer, the materials of the inner layer and the outer layer are different, the material of the inner layer is gold, with a thickness of 0.1 - 0.3 mm, the thickness of the outer layer is 0.8 - 1.2 mm, the material of the fiber core is germanium silicon, with a diameter of 30 - 80 μm, and the material of the cladding is borosilicate, with a diameter of 100 - 150 μm.

[0009] Another object of the present invention is to provide an electrical equipment detection system, which can accurately reflect the operating state of the electrical equipment. The system includes a circuit gain module detection module, which is connected to the electrical equipment, and collects the input signal and output signal of the detection circuit in the electrical equipment in real time and calculates the ratio of the input signal to the output signal to obtain circuit gain information; the above-mentioned temperature compensation type current transformer, which is arranged outside the power supply wire and is used to collect the power supply current data of the electrical equipment in real time; a processing module, which is respectively connected to the circuit gain detection module and the temperature compensation type current transformer, collects the circuit gain information and the power supply current data, comprehensively analyzes the circuit gain information and the power supply current data, and obtains an evaluation parameter; a detection module, which is used to judge the operating state of the equipment according to the evaluation parameter; wherein, the types of the input signal and the output signal are current, voltage or power signals

[0010] As a preferred embodiment of the electrical equipment detection system of the present invention, wherein: the calculation formula of the evaluation parameter is:

[0011] P i =(a i / b i ) 2 / (a i-1 / b i-1 ) 2

[0012] Wherein, P i is the evaluation parameter, a i is the circuit gain information, b i is the power supply current data, and i is 1, 2, 3... n.

[0013] As a preferred embodiment of the electrical equipment detection system of the present invention, wherein: the detection module is further provided with a wireless transmission terminal for connecting to a remote monitoring terminal, and the remote monitoring terminal can view the status information and historical data of the electrical equipment.

[0014] The third object of the present invention is to provide an electrical equipment detection method, which is applicable to the above-mentioned electrical equipment detection system. The method includes: collecting the input signal and output signal of the detection circuit in the electrical equipment in real time, and calculating the ratio of the input signal to the output signal to obtain circuit gain information; collecting the power supply current data of the electrical equipment in real time; comprehensively analyzing the circuit gain information and the power supply current data to obtain an evaluation parameter; judging the operating state of the electrical equipment according to the evaluation parameter; wherein, the types of the input signal and the output signal are current, voltage or power signals.

[0015] As a preferred solution of the electrical equipment detection method of the present invention, among them: comprehensively analyzing the circuit gain information and the power supply current data includes defining the circuit gain information as P i Then the circuit gain information is P i The calculation formula of is:

[0016] P i =(a i / b i ) 2 / (a i-1 / b i-1 ) 2

[0017] Wherein, P i is the evaluation parameter, a i is the circuit gain information, b i is the power supply current data, and i is 1, 2, 3...n.

[0018] As a preferred solution of the electrical equipment detection method of the present invention, among them: judging the operating state of the equipment according to the evaluation parameter includes obtaining the parameter range during normal operation of the equipment through a calibration experiment, and judging that the equipment is operating abnormally when P i exceeds this range.

[0019] The beneficial effects of the present invention are: the present invention adopts a temperature-compensated current transformer, considers the influence of temperature on the collected current, and performs real-time temperature compensation on the sensed current, improving the acquisition accuracy of the electrical equipment current data; by collecting the circuit gain and power supply current data of the electrical equipment in real time, an evaluation parameter based on the change of the circuit gain and the fluctuation of the power supply current is established, which accurately reflects the operating state of the electrical equipment. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a cross-sectional view of a temperature-compensated current transformer.

[0022] Figure 2 It is a radial cross-sectional view of the conductive optical fiber described in Embodiment 1.

[0023] Figure 3 It is an axial cross-sectional view of the conductive optical fiber described in Embodiment 1.

[0024] Figure 4 It is a cross-sectional view of the terminal block described in Embodiment 1.

[0025] Figure 5 It is a schematic block diagram of the electrical equipment detection system described in Embodiment 2. Specific Embodiments

[0026] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings of the specification.

[0027] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is separately or selectively mutually exclusive with other embodiments.

[0029] Embodiment 1

[0030] Referring to Figures 1 to 4 , it is the first embodiment of the present invention. This embodiment provides a temperature-compensated current transformer, and the temperature-compensated current transformer includes an iron core 100, a conductive optical fiber 200, and a transfer terminal 300.

[0031] Specifically, referring to Figure 1The iron core 100 is in the shape of a ring, and the iron core 100 is coaxially embedded in the housing 800. The conductive optical fiber 200 is evenly wound on the iron core 100. According to different measurement requirements, the number of winding turns of the conductive optical fiber 200 is different. For example, the number of winding turns can be set to any value between 2 and 1000. When measuring, the measuring wire is passed through the hollow ring part of the housing 800 to measure the current of the wire. The two ends of the conductive optical fiber 200 are also connected with the adapter terminals 300.

[0032] Further, see Figure 2 and Figure 3 The conductive optical fiber 200 includes a core 201, a cladding 202, a metal layer 203, and an insulating layer 204. The core 201, the cladding 202, the metal layer 203, and the insulating layer 204 are arranged in sequence from the inside to the outside. The refractive index of the core 201 is greater than that of the cladding 202. The metal is coated on the cladding 202 by evaporation or during the optical fiber drawing process to realize the production of the conductive optical fiber 200.

[0033] Preferably, the material of the core 201 is germanium silicon, the material of the cladding 202 is boron silicon, and the material of the metal layer 203 is gold, silver, copper, aluminum, etc. The diameter of the core 201 is 30-80 μm, the diameter of the cladding 202 is 100-150 μm, and the thickness of the metal layer 203 is 0.9-1.5 mm.

[0034] Preferably, the metal layer 203 is divided into two layers, namely an inner layer 203a and an outer layer 203b. The inner layer 203a is gold, and the outer layer 203b is silver, copper, or aluminum. The thickness of the inner layer 203a is 0.1 to 0.3 mm, and the thickness of the outer layer 203b is 0.8 to 1.2 mm. By setting up multiple layers of metal, the toughness of the optical fiber is improved while reducing the production cost.

[0035] Further, see Figure 4 The transfer terminal 300 includes a hollow cylinder 301, a first limiting ring 302, a second limiting ring 303, a lens group 304, a window sheet 305 and a terminal 306. The hollow cylinder 301 has a cavity 301a, and the inner wall of the hollow cylinder 301 is gap-matched with the outer wall of the metal layer 203 (for example, the inner wall diameter of the hollow cylinder 301 is 0.01 mm larger than the outer wall diameter of the metal layer 203).

[0036] The first limiting ring 302 abuts against the end of the metal layer 203 and is 15 mm away from the right edge of the hollow cylinder 301. The second limiting ring 303 is 15 mm away from the left edge of the hollow cylinder 301. The right side of the hollow cylinder 301 is provided with an external thread, a rubber ring and a locking nut for fixing the conductive optical fiber 200. The first limiting ring 302 is a conductive metal ring, and the side thereof in contact with the metal layer 203 is coated with an elastic conductive film to reduce the contact resistance.

[0037] On the outer side of the hollow cylinder 301, there is also a terminal 306. A wire hole is provided inside the hollow cylinder 301, and a wire 307 is connected to the terminal 306 and the first limiting ring 302 through the wire hole.

[0038] The second limiting ring 303 is a rigid insulating ring. The function of the first limiting ring 302 is for limiting and conducting electricity. On the one hand, it accurately controls the distance between the output end of the conductive optical fiber 200 and the lens group 304, maintaining a good optical signal collimation and coupling effect. On the other hand, it connects the terminal 306, integrating the functions of limiting and conducting electricity, and simplifying the structure of the adapter terminal 300.

[0039] It should be noted that the lens group 304 is arranged between the window panes 305. The window panes 305 include a first window pane 305a and a second window pane 305b. The first window pane 305a is closely attached to one side of the first limiting ring 302 close to the lens group 304, and the second window pane 305b is closely attached to one side of the second limiting ring 303 close to the lens group 304. In addition, the lens group 304 includes a first lens 304a and a second lens 304b.

[0040] The working principle of the temperature compensation type current transformer described in this embodiment is as follows: A laser or pulsed optical signal is injected into the fiber core 201. When the optical signal is transmitted in the fiber core 201, the vibration between molecules is related to the photon energy transfer caused. The change in temperature will cause a change in the molecular vibration state, thereby affecting the frequency and intensity of Raman light scattering or Brillouin light scattering. By analyzing the frequency shift and intensity change of the optical scattering signal, the temperature distribution along the fiber length is obtained. The wire to be measured is passed through a specified position of the temperature compensation type current transformer. Through experiments and tests, the current characteristic curves of the temperature compensation type current transformer at different temperatures are collected. Based on these data, a mathematical model of the temperature-current characteristic curve is established to compensate the measured current in real time.

[0041] Embodiment 2

[0042] Referring to Figure 5 , this is the second embodiment of the present invention, and this embodiment is based on the previous embodiment. This embodiment provides an electrical equipment detection system. The detection system includes a circuit gain module detection module 400, the temperature compensation type current transformer described in Embodiment 1, a processing module 500, and a detection module 600.

[0043] Specifically, the circuit gain module detection module 400 is used to access the electrical equipment, collect the input signal and output signal of the detection circuit in the electrical equipment in real time, and calculate the ratio of the input signal to the output signal to obtain the circuit gain information;

[0044] The temperature compensation type current transformer described in Embodiment 1 is arranged outside the power supply wire and is used to collect the power supply current data of the electrical equipment in real time;

[0045] A processing module 500, which is respectively connected to a circuit gain detection module 400 and a temperature-compensated current transformer, is used to collect circuit gain information and supply current data, comprehensively analyze the circuit gain information and the supply current data, and obtain an evaluation parameter;

[0046] A detection module 600 is used to judge the operating state of the device according to the evaluation parameter;

[0047] Wherein, the categories of the input signal and the output signal are current, voltage or power signals.

[0048] Further, the process of comprehensively analyzing the circuit gain information and the supply current data includes: collecting the circuit gain information a i and the supply current data b i (i = 1, 2... n) in real time in seconds, and constructing an evaluation parameter P i :

[0049] P i = (a i / b i ) 2 / (a i-1 / b i-1 ) 2

[0050] The evaluation parameter P i is used to reflect the relationship between the change of the circuit gain and the fluctuation of the supply current at each moment, and can accurately reflect the operating state of the electrical equipment.

[0051] Further, the process of judging the operating state of the device according to the evaluation parameter includes: obtaining the parameter range during normal operation of the device through a calibration experiment, and judging that the device is operating abnormally when P i exceeds this range.

[0052] Further, the detection module 600 is also provided with a wireless transmission terminal 601, which is used to connect to a remote monitoring terminal 700. Users can view the status information and historical data of the electrical equipment through the remote monitoring terminal 700; when the remote monitoring terminal 700 finds that the electrical equipment is operating abnormally, it sends an alarm message to remind the user to perform corresponding maintenance and processing. In this embodiment, through the remote monitoring terminal 700, the status information and historical data of the electrical equipment can be viewed in real time, and when the data is abnormal, the user is reminded to perform corresponding maintenance and processing in time.

[0053] In summary, by collecting the circuit gain and supply current data of electrical equipment in real time and establishing evaluation parameters based on the change of circuit gain and the fluctuation of supply current, the operating state of electrical equipment can be accurately reflected; the temperature-compensated current transformer takes into account the influence of temperature on the collected current and performs real-time temperature compensation on the sensed current, improving the acquisition accuracy of the current data of electrical equipment.

[0054] Embodiment 3

[0055] Based on the previous two embodiments, this embodiment provides a method for detecting electrical equipment. This method is applicable to the electrical equipment detection system described in Embodiment 2. The method includes:

[0056] S1: Collect the input signal and output signal of the detection circuit in the electrical equipment in real time, and calculate the ratio of the input signal to the output signal to obtain the circuit gain information. The types of the input signal and the output signal are current, voltage or power signals. And define the circuit gain information as a i .

[0057] S2: Collect the supply current data of the electrical equipment in real time. Among them, the supply current data is defined as b i .

[0058] S3: Perform comprehensive analysis on the circuit gain information a i and the supply current data b i and obtain the evaluation parameter. Define the evaluation parameter as P i , in seconds, collect the circuit gain information a i and the supply current data b i (i = 1, 2... n) in real time, and construct the evaluation parameter P i , then the calculation formula of P i is:

[0059] P i = (a i / b i ) 2 / (a i-1 / b i-1 ) 2

[0060] The evaluation parameter P i is used to reflect the relationship between the change of circuit gain and the fluctuation of supply current at each moment, and can accurately reflect the operating state of the electrical equipment.

[0061] S4: Judge the operating state of the electrical equipment according to the evaluation parameter.

[0062] Specifically, obtain the parameter range during normal operation of the equipment through calibration experiments, and when P iWhen it exceeds this range, it is determined that the device is operating abnormally.

[0063] By collecting the circuit gain a of the electrical equipment in real time i and the power supply current data b i , an evaluation parameter based on the circuit gain change and the power supply current fluctuation is established, which can accurately reflect the operating state of the electrical equipment.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A temperature-compensated current transformer, characterized in that: including, a core (100) in an annular shape; a conductive optical fiber (200) evenly wound around the core (100); adapter terminals (300) respectively connected to both ends of the conductive optical fiber (200); the conductive optical fiber (200) includes a core (201), a cladding (202), a metal layer (203), and an insulating layer (204) arranged in sequence from inside to outside, and the refractive index of the core (201) is greater than that of the cladding (202); the adapter terminal (300) includes a hollow cylinder (301), a cavity (301a) is formed inside the hollow cylinder (301), and the inner wall of the hollow cylinder (301) cooperates with the outer wall of the metal layer (203); a first limiting ring (302), a second limiting ring (303), a lens group (304), and a window pane (305) are further arranged in the cavity (301a) of the hollow cylinder (301), the first limiting ring (302) abuts against the metal layer (203) of the conductive optical fiber (200), the lens group (304) is arranged between the first limiting ring (302) and the second limiting ring (303), and the window pane (305) closely adheres to the first limiting ring (302) and the second limiting ring (303) and is on the side close to the lens group (304); a wiring terminal (306) is further arranged outside the hollow cylinder (301), the wiring terminal (306) is connected to the first limiting ring (302) through a wire (307), and the wire (307) is arranged inside the hollow cylinder (301).

2. The temperature-compensated current transformer according to claim 1, wherein: the metal layer (203) includes an inner layer (203a) and an outer layer (203b), the materials of the inner layer (203a) and the outer layer (203b) are different, the material of the inner layer (203a) is gold with a thickness of 0.1 - 0.3 mm, the thickness of the outer layer (203b) is 0.8 - 1.2 mm, the material of the core (201) is germanium silicon with a diameter of 30 - 80 μm, and the material of the cladding (202) is borosilicate with a diameter of 100 - 150 μm.

3. An electrical equipment detection system, characterized in that: including, a circuit gain detection module (400) accessing an electrical device, collecting the input signal and the output signal of the detection circuit in the electrical device in real time and calculating the ratio of the input signal to the output signal to obtain circuit gain information; the temperature - compensated current transformer according to any one of claims 1 - 2, which is arranged outside the power supply wire and is used for collecting the power supply current data of the electrical device in real time; a processing module (500) respectively connected to the circuit gain detection module (400) and the temperature - compensated current transformer, collecting the circuit gain information and the power supply current data, comprehensively analyzing the circuit gain information and the power supply current data, and obtaining an evaluation parameter; a detection module (600) for judging the operating state of the device according to the evaluation parameter; wherein, the categories of the input signal and the output signal are current, voltage, or power signals.

4. The electrical equipment detection system according to claim 3, wherein: The calculation formula of the evaluation parameter is: Pi = (ai / bi)² / (ai-1 / bi-1)² Where, Pi is the evaluation parameter, ai is the circuit gain information, bi is the power supply current data, and i is 1, 2, 3... n.

5. The electrical equipment detection system according to claim 4, characterized in that: The detection module (600) is further provided with a wireless transmission terminal (601) for connecting to a remote monitoring terminal (700), and the remote monitoring terminal (700) can view the status information and historical data of the electrical equipment.

6. A method for detecting an electrical device, characterized in that: Applicable to the electrical equipment detection system according to any one of claims 3 to 5, the detection method includes Collecting in real time the input signal and output signal of the detection circuit in the electrical equipment, and calculating the ratio of the input signal to the output signal to obtain the circuit gain information; Collecting in real time the power supply current data of the electrical equipment; Performing comprehensive analysis on the circuit gain information and the power supply current data, and obtaining an evaluation parameter; Judging the operating state of the electrical equipment according to the evaluation parameter; Wherein, the types of the input signal and the output signal are current, voltage or power signals.

7. The electrical equipment detection method according to claim 6, characterized in that: Performing comprehensive analysis on the circuit gain information and the power supply current data includes defining the circuit gain information as Pi, and the calculation formula of the circuit gain information as Pi is: Pi = (ai / bi)² / (ai-1 / bi-1)² Where, Pi is the evaluation parameter, ai is the circuit gain information, bi is the power supply current data, and i is 1, 2, 3... n.

8. The electrical equipment detection method according to claim 7, characterized in that: Judging the operating state of the equipment according to the evaluation parameter includes obtaining the parameter range during normal operation of the equipment through a calibration experiment, and judging that the equipment is operating abnormally when Pi exceeds this range.

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