Voltage-current integrated current transformer detection device

Abstract

The invention is suitable for the technical field of electric power detection, and relates to a voltage-current integrated current transformer detection device, which comprises a shell unit; a tested terminal assembly and a metering test unit are arranged in the shell unit, the tested terminal assembly is mounted on the metering test unit, and the shell unit, the tested terminal assembly and the metering test unit are integrally mounted on the three-phase electric energy meter detection table body; the tested terminal assembly comprises a voltage terminal, a current terminal and a U-shaped elastic piece, the current terminal is connected with the U-shaped elastic piece, the metering test unit comprises a management MCU, a metering module and a communication module, the management MCU is in communication connection with the metering module and the communication module, and the communication module is further in communication connection with the upper computer. The device is simple in structure and convenient to operate, and the detection precision of the current transformer is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power detection, and particularly relates to a current transformer detection device integrating voltage and current. Background Art

[0002] Current transformers are widely used in fields such as industrial automation, intelligent meters, rail transit, and new energy, for monitoring, measuring, and controlling current to ensure the stable operation of the system. With the development of the power system and the progress of technology, the accuracy requirements for current transformers will also become higher and higher. This is because high-accuracy current transformers can not only ensure the fairness and accuracy of metering, but also improve the reliability of protection devices. Detecting the error accuracy of current transformers in advance during the production and use processes can effectively screen out defective products, optimize the process and design in advance for existing risks, reduce costs, and enhance customer trust.

[0003] At present, the current transformer detection devices on the market generally can only apply current for detection. There are basically no detection devices for current transformers that can satisfy the simultaneous application of voltage and current, and it is impossible to truly and effectively simulate the actual application situation for the detection of current transformers, resulting in the inability to guarantee the detection accuracy of current transformers. The patent application with the publication number CN106990378A provides an AC filter bank current transformer polarity detection device, including a signal acquisition unit (1) and a dosing detection unit (2) for applying a current test quantity to the primary circuit of the AC filter bank to be measured. The signal acquisition unit (1) is respectively connected to the current transformers at the head and end of the AC filter bank to be measured. One end of the output end of the dosing detection unit (2) is connected to the inner lead of the optoelectronic current transformer at the head end of the AC filter bank to be measured, and the other end is connected to the inner lead of the electronic current transformer at the end of the AC filter bank to be measured. A test current loop is formed through the grounding switch on the outside of the optoelectronic current transformer at the head end of the AC filter bank to be measured that has been closed, the grounding point on the outside of the electronic current transformer at the end of the AC filter bank to be measured, and the ground. In this patent application, only current is applied for the detection of current transformers, and the detection accuracy cannot be guaranteed, and there are the same drawbacks as the existing technology.

[0004] Therefore, how to provide a current transformer detection device integrating voltage and current and capable of being compatible with the detection of current transformers that only apply current to improve the detection accuracy of current transformers is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a current transformer detection device integrating voltage and current to solve the problem of low detection accuracy of current transformers in the prior art.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a current transformer detection device integrating pressure and current, including: a housing unit;

[0008] A measured terminal assembly and a metering and testing unit are arranged in the housing unit. The measured terminal assembly is installed on the metering and testing unit, and the overall housing unit, measured terminal assembly, and metering and testing unit are installed on a three-phase electric energy meter detection bench.

[0009] The measured terminal assembly includes a voltage terminal, a current terminal, and a U-shaped elastic sheet. The current terminal is connected to the U-shaped elastic sheet. The metering and testing unit includes a management MCU, a metering module, and a communication module. The management MCU is respectively communicatively connected to the metering module and the communication module, and the communication module is also communicatively connected to a host computer.

[0010] Further, the housing unit includes a first housing and a second housing. The first housing and the second housing are connected by a snap-fastening method. The measured terminal assembly and the metering and testing unit are arranged in the cavity formed by the first housing and the second housing.

[0011] Further, the measured terminal assembly further includes a terminal base, and the voltage terminal and the current terminal are installed on the terminal base.

[0012] Further, the metering and testing unit further includes a display module, and the display module is communicatively connected to the management MCU.

[0013] Further, the display module includes a liquid crystal, buttons, and indicator lights. The liquid crystal, buttons, and indicator lights are arranged on the bottom plate of the metering and testing unit.

[0014] Further, a secondary measured current transformer socket is also arranged on the bottom plate, and the secondary measured current transformer is installed on the secondary measured current transformer socket.

[0015] Further, main terminal voltage interfaces for accessing UA, UB, UC, and N are also arranged on the bottom plate.

[0016] Further, the primary measured current transformer is installed on the U-shaped elastic sheet.

[0017] Further, the metering and testing unit further includes a power supply module, and the power supply module is communicatively connected to the management MCU.

[0018] Further, the number of meter hanging positions on the three-phase intelligent electric energy meter detection bench is 1 to 32, and the number of measured current transformers for a single meter position is 1 to 3.

[0019] Compared with the prior art, the current transformer detection device integrating voltage and current provided by the present invention has at least the following beneficial effects:

[0020] At present, the current transformer detection equipment on the market can generally only apply current for detection. There is basically no detection equipment for current transformers that can meet the simultaneous application of voltage and current, and it is impossible to truly and effectively simulate the actual application situation for the detection of current transformers, resulting in the inability to guarantee the accuracy of the detection of current transformers. The structure of the present invention is simple and the operation is convenient, filling the detection blank that can realize the integration of voltage and current in the detection of current transformers. At the same time, the test device can be extended as an automatic detection device for batch current transformers; the present invention reduces the labor cost, reduces the interference caused by human factors and environmental factors, and improves the accuracy and efficiency of the test; it is applicable to the process screening of current transformer manufacturers and the raw material inspection of the current transformer using end, and can also automatically record the test results in real time and analyze them, playing an important role in the construction of an intelligent laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the solution of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is an exploded view of a current transformer detection device integrating voltage and current provided by an embodiment of the present invention;

[0023] Figure 2 It is an exploded view of a measured terminal assembly of a current transformer detection device integrating voltage and current provided by an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the working structure of a current transformer detection device integrating voltage and current provided by an embodiment of the present invention;

[0025] Reference Numerals: 10 - housing unit; 101 - first housing; 102 - second housing; 20 - terminal assembly under test; 201 - voltage terminal; 202 - current terminal; 203 - U-shaped elastic sheet; 204 - terminal base; 30 - metering and testing unit; 301 - management MCU; 302 - metering module; 303 - communication module; 304 - display module; 3041 - liquid crystal; 3042 - button; 3043 - indicator light; 305 - bottom plate; 3051 - socket for secondary current transformer under test; 3052 - main terminal voltage interface; 306 - power module; 40 - three-phase watt-hour meter test bench; 50 - host computer; 60 - current transformer under test; 601 - primary current transformer under test; 602 - secondary current transformer under test. Detailed Implementation Manner

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs; the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, terms such as "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positions based on the orientations or positions shown in the drawings, and are only for convenience of description and should not be construed as limitations to the technical solution of this application.

[0027] In addition, the terms "comprising" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusion; the terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects and not to describe a specific order. In the specification and claims of the present invention and the above-mentioned drawings, when an element is referred to as being "fixed to" or "mounted on" or "disposed on" or "connected to" another element, it can be directly or indirectly located on that other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to that other element.

[0028] Furthermore, the mention of "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0029] The present invention provides a current transformer detection device integrating voltage and current, which is applied to the accuracy detection of current transformers in the power system. The current transformer detection device integrating voltage and current includes:

[0030] A housing unit; a measured terminal assembly and a metering and testing unit are arranged inside the housing unit. The measured terminal assembly is installed on the metering and testing unit, and the overall installation of the housing unit, the measured terminal assembly and the metering and testing unit is on the three-phase watt-hour meter detection bench. The measured terminal assembly includes a voltage terminal, a current terminal and a U-shaped spring piece. The current terminal is connected to the U-shaped spring piece. The metering and testing unit includes a management MCU, a metering module and a communication module. The management MCU is respectively communicatively connected to the metering module and the communication module, and the communication module is also communicatively connected to the upper computer.

[0031] The structure of the present invention is simple and the operation is convenient, effectively improving the detection accuracy of the current transformer.

[0032] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings.

[0033] The present invention provides a current transformer detection device integrating voltage and current, which is applied to the accuracy detection of current transformers in the power system. In combination with Figures 1 to 3 , in this embodiment, the current transformer detection device integrating voltage and current includes:

[0034] Housing unit 10; the housing unit 10 includes a first housing 101 and a second housing 102, both of which are made of flame-retardant and insulating materials to ensure the safety of the housing. The first housing 101 and the second housing 102 are connected by a snap-fastening method. Inside the cavity formed by the first housing 101 and the second housing 102, there are a measured terminal assembly 20 and a metering and testing unit 30. The measured terminal assembly 20 is installed on the metering and testing unit 30 and is connected by a plug-in method. The first housing 101 and the second housing 102 protect the measured terminal assembly 20 and the metering and testing unit 30. The whole of the housing unit 10, the measured terminal assembly 20, and the metering and testing unit 30 is installed on a three-phase watt-hour meter detection bench 40; the number of the measured terminal assemblies 20 is configured according to the number of watt-hour meters hung on the three-phase watt-hour meter detection bench 40. The measured terminal assembly 20 includes a voltage terminal 201, a current terminal 202, a U-shaped spring piece 203, and a terminal base 204. The voltage terminal 201 is used for voltage input, and the current terminal is used for current input. The current terminal 202 and the U-shaped spring piece 203 are electrically connected. The metering and testing unit 30 includes a management MCU 301, a metering module 302, and a communication module 303. The management MCU 301 is respectively communicatively connected to the metering module 302 and the communication module 303. The communication module 303 is also communicatively connected to a host computer 50. The voltage terminal 201 and the current terminal 202 are installed on the terminal base 204, and the terminal base 204 plays an electrical isolation role.

[0035] In this embodiment, the current transformer 60 to be measured is inserted onto the terminal assembly 20 to be measured in a U-shaped insertion manner. Specifically, the primary current transformer 601 to be measured is installed on the U-shaped spring piece 203, and the secondary current transformer 602 to be measured is installed on the secondary current transformer socket 3051. The secondary current transformer socket 3051 is fixed on the bottom plate 305 of the metering and testing unit 30. The bottom plate 305 is also provided with a main terminal voltage interface 3052 for accessing three-phase voltages UA, UB, and UC. The number of terminal assemblies 20 to be measured can be configured according to the number of meters hung on the three-phase smart electricity meter testing bench 40. The number of current transformers to be measured for a single meter position is 3. Subsequently, the housing unit 10 is put on and installed at any meter hanging position on the three-phase smart electricity meter testing bench 40, numbered X1#, X2#, X3# from left to right, where X is the meter hanging position number corresponding to the three-phase smart electricity meter testing bench 40. Then, the communication interface of the communication module 303 of the metering and testing unit 30 is connected to the corresponding communication interface of the host computer 50, and the communication interface of the three-phase smart electricity meter testing bench 40 is serially connected to the host computer 50. At this time, the host computer 50 communicates and pairs with the communication interfaces of the three-phase smart electricity meter testing bench 40 and the metering and testing unit 30, and the files of the three current transformers to be measured, namely X1#, X2#, and X3#, are entered into the host computer 50. Then, the detection device is powered on, and corresponding voltages, currents, and phases are applied to the terminal assembly 20 to be measured separately or simultaneously. By reading the voltages, currents, and phase angles of the current transformers of the terminal assemblies X1#, X2#, and X3# to be measured collected by the metering and testing unit and converting the voltage, current, and phase angle data applied by the host computer 50 to the standard source of the three-phase smart electricity meter testing bench 40 into angular difference and ratio error data of the current transformer, a report is output.

[0036] In this embodiment, the number of current transformers to be measured for a single meter position is generally 1 to 3, preferably 3, and the number of meters hung for a single meter position with the data of the current transformers to be measured being an integer multiple of 3.

[0037] In this embodiment, the number of meter hanging positions of the three-phase smart electricity meter testing bench 40 is generally 1 to 32, preferably 32. The standard source of the three-phase smart electricity meter testing bench 40 is configured and selected according to the measurement accuracy level of the current transformer. Preferably, the accuracy level of the device is 0.01 level.

[0038] In this embodiment, during the parameter maintenance process, the host computer 50 must maintain important parameters such as the number, current specification, transformation ratio of the current transformer under test, and the communication baud rate with the metering and testing unit 30. It supports data rounding, automatic storage, data backup and recovery, facilitating users to manage and analyze data. When the host computer 50 obtains the standard source voltage, current, and phase applied to the metering and testing unit 30 through serial communication, and then the host computer 50 continues to read the voltage, current, and phase angle measured by the corresponding metering and testing unit 30, and combines the transformation ratio of the current transformer to calculate the ratio error and angle error of the corresponding current transformer 60 under test, and performs automatic data storage and analysis.

[0039] Further, in this embodiment, the metering and testing unit 30 further includes a display module 304. The display module 304 is communicatively connected to the management MCU 401 and is used to display the current transformer detection data and warnings, and facilitate the staff to perform debugging.

[0040] Specifically, in this embodiment, the display module 304 includes a liquid crystal display 3041, buttons 3042, and indicator lights 3043. The liquid crystal display 3041 is used to display the current transformer detection data. The buttons 3042 facilitate the staff to perform debugging. The indicator lights 3043 play a warning and reminder role. The indicator lights 3043 are arranged on the liquid crystal display 3041, and the buttons 3042 are arranged on one side of the liquid crystal display 3041. All three are installed on the bottom plate 305 of the metering and testing unit 30.

[0041] Further, in this embodiment, the metering and testing unit 30 further includes a power supply module 306, which is used to convert the input alternating current into direct current to supply power to the management MCU 301, the metering module 302, the communication module 303, and the display module 304. It is powered by the three-phase intelligent watt-hour meter detection bench 40, and two isolated DC power supplies are output through an isolated AC / DC power supply. One DC power supply is used to supply power to the management MCU 301, the metering module 302, and the display module 304, and the other DC power supply is used to supply power to the communication module 303. The metering module 302 includes a metering chip that can meet at least 3-way metering, a current sampling unit for collecting current, and a voltage sampling unit for collecting voltage. Different specifications of current sampling elements can be selected according to the specifications of the current transformer under test. The two isolated DC power supplies meet the insulation requirements of 4KV for AC current isolation withstand voltage. The management MCU 301 realizes serial communication with the communication module 303 through opto-isolation, communicates with the metering unit 302 through the SPI method, and controls and responds to the liquid crystal display 3041, buttons 3042, indicator lights 3043, etc. through GPIO ports.

[0042] Compared with the prior art, the current transformer detection device with integrated voltage and current in the above embodiments is such that the current transformer detection equipment on the current market generally can only apply current for detection, and there is basically no transformer detection equipment that can satisfy the simultaneous application of voltage and current. It is impossible to truly and effectively simulate the actual application situation for the detection of current transformers, resulting in the inability to guarantee the accuracy of the current transformer detection. The structure of the present invention is simple and the operation is convenient, filling the detection gap that can achieve integrated voltage and current in the detection of current transformers. At the same time, the test device can be extended as an automated detection device for batch current transformers; the present invention reduces the labor cost, reduces the interference caused by human factors and environmental factors, and improves the accuracy and efficiency of the test; it is applicable to the process screening of current transformer manufacturers and the raw material inspection of the current transformer use end, and can also automatically record the test results in real time and analyze them, playing an important role in the construction of an intelligent laboratory.

[0043] Obviously, the above-described embodiments are only the preferred embodiments of the present invention, rather than all the embodiments. The preferred embodiments of the present invention are given in the drawings, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present invention in other related technical fields is similarly within the scope of the patent protection of the present invention.

Claims

1. A voltage-current integrated current transformer detection device, characterized in that: include: Housing unit; The housing unit is provided with a terminal assembly to be tested and a metering and testing unit, the terminal assembly to be tested is mounted on the metering and testing unit, and the housing unit, the terminal assembly to be tested and the metering and testing unit are integrally mounted on a three-phase electric energy meter detection platform; The terminal assembly under test includes a voltage terminal, a current terminal and a U-shaped spring piece, the current terminal is connected to the U-shaped spring piece, and the metering and testing unit includes a management MCU, a metering module and a communication module, the management MCU is communicatively connected to the metering module and the communication module respectively, and the communication module is also communicatively connected to the host computer.

2. The voltage-current integrated current transformer detection device according to claim 1, characterized in that: The housing unit comprises a first shell and a second shell, the first shell is connected to the second shell by means of a snap, and the terminal assembly to be tested and the measuring and testing unit device are in a cavity formed by the first shell and the second shell.

3. The voltage-current integrated current transformer detection device according to claim 1, characterized in that: The terminal assembly under test also includes a terminal base, and the voltage terminal and the current terminal are mounted on the terminal base.

4. The voltage-current integrated current transformer detection device according to claim 1, characterized in that: The measurement and testing unit further includes a display module, and the display module is communicatively connected with the management MCU.

5. The voltage-current integrated current transformer detection device according to claim 4, characterized in that: The display module comprises a liquid crystal, a button and an indicator light, and the liquid crystal, the button and the indicator light are arranged on the bottom plate of the measurement and testing unit.

6. The voltage-current integrated current transformer detection device according to claim 5, characterized in that: The bottom plate is also provided with a secondary current transformer socket, and the secondary current transformer is mounted on the secondary current transformer socket.

7. The voltage-current integrated current transformer detection device according to claim 5, characterized in that: The bottom plate is also provided with a main terminal voltage interface for connecting UA, UB, UC, and N.

8. The voltage-current integrated current transformer detection device according to claim 1, characterized in that: The primary measured current transformer is mounted on the U-shaped spring piece.

9. The voltage-current integrated current transformer detection device according to claim 1, characterized in that: The measurement and testing unit further includes a power supply module, and the power supply module is communicatively connected with the management MCU.

10. The voltage-current integrated current transformer detection device according to claim 1, characterized in that: The number of meter digits on the three-phase smart energy meter detection platform is 1 to 32, and the number of current transformers to be measured in a single meter digit is 1 to 3.

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