Voltage-current integrated current transformer detection device

Abstract

The utility model 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 current transformer detection device is simple in structure and convenient to operate, and the detection precision of the current transformer is effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of power detection technology, and in particular relates to a current transformer detection device that integrates voltage and current. Background Technology

[0002] Current transformers are widely used in industrial automation, smart meters, rail transportation, and new energy fields to monitor, measure, and control current, ensuring stable system operation. With the development of power systems and technological advancements, the accuracy requirements for current transformers will continue to increase. This is because high-accuracy current transformers not only guarantee the fairness and accuracy of metering but also improve the reliability of protection devices. Early error accuracy testing of current transformers during production and use can effectively screen out defective products, proactively optimize processes and designs to address potential risks, reduce costs, and enhance customer trust.

[0003] Currently, most current transformer testing equipment on the market can only apply current for testing. There are virtually no testing devices that can simultaneously apply voltage and current, making it impossible to accurately simulate the testing of current transformers under actual application conditions, thus compromising the accuracy of current transformer testing. Patent application CN106990378A provides a polarity detection device for AC filter bank current transformers, including a signal acquisition unit (1) and an addition detection unit (2) for applying a current test quantity to the primary circuit of the AC filter bank under test. The signal acquisition unit (1) is connected to the first and last current transformers of the AC filter bank under test, respectively. One end of the output of the addition detection unit (2) is connected to the inner lead of the photoelectric current transformer at the first end of the AC filter bank under test, and the other end is connected to the inner lead of the electronic current transformer at the last end of the AC filter bank under test. The test current loop is formed by the grounding switch on the outside of the photoelectric current transformer at the first end of the AC filter bank under test, the grounding point on the outside of the electronic current transformer at the last end of the AC filter bank under test, and the earth. This patent application also only applies current to the current transformer for detection, so the detection accuracy cannot be guaranteed, which has the same drawbacks as the prior art.

[0004] Therefore, how to provide a current transformer detection device that integrates pressure and current, and is compatible with current transformer detection that only applies current, in order to improve the detection accuracy of current transformers, is a problem that urgently needs to be solved by those in this technical field. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a current transformer detection device that integrates pressure and current to solve the problem of low detection accuracy of current transformers in the existing technology.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model provides a current transformer detection device that integrates voltage and current, including: a housing unit;

[0008] The housing unit contains a terminal assembly under test and a metering and testing unit. The terminal assembly under test is mounted on the metering and testing unit. The housing unit, the terminal assembly under test, and the metering and testing unit are all mounted on a three-phase energy meter testing platform.

[0009] The tested terminal assembly includes a voltage terminal, a current terminal, and a U-shaped spring. The current terminal and the U-shaped spring are connected. 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. The communication module is also communicatively connected to a host computer.

[0010] Furthermore, the housing unit includes a first housing and a second housing, the first housing and the second housing are connected by a snap-fit ​​mechanism, and the terminal assembly under test and the metrology and testing unit equipment are located in the cavity formed by the first housing and the second housing.

[0011] Furthermore, the terminal assembly under test also includes a terminal base, on which the voltage terminal and the current terminal are mounted.

[0012] Furthermore, the measurement and testing unit also includes a display module, which is communicatively connected to the management MCU.

[0013] Furthermore, the display module includes a liquid crystal display, buttons, and indicator lights, which are mounted on the base plate of the measurement and testing unit.

[0014] Furthermore, the base plate is also provided with a secondary current transformer socket, and the secondary current transformer is installed on the secondary current transformer socket.

[0015] Furthermore, the base plate is also provided with main terminal voltage interfaces for connecting UA, UB, UC, and N.

[0016] Furthermore, the primary current transformer under test is mounted on the U-shaped spring.

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

[0018] Furthermore, the number of meter positions on the three-phase smart energy meter testing platform ranges from 1 to 32, and the number of current transformers tested per meter position ranges from 1 to 3.

[0019] Compared with the prior art, the integrated voltage and current transformer detection device provided by this utility model has at least the following advantages:

[0020] Currently, most current transformer testing equipment on the market can only apply current for testing. There are virtually no devices that can simultaneously apply voltage and current, making it impossible to accurately simulate real-world testing conditions and compromising the accuracy of current transformer testing. This invention features a simple structure and convenient operation, filling the gap in current transformer testing by providing integrated voltage and current testing. Furthermore, this testing device can be expanded to serve as an automated testing system for batch current transformers. This invention reduces labor costs, minimizes interference from human and environmental factors, and improves testing accuracy and efficiency. It is suitable for process screening by current transformer manufacturers and raw material inspection at the user end of current transformers. It also automatically records and analyzes test results in real time, playing a crucial role in the construction of intelligent laboratories. Attached Figure Description

[0021] To more clearly illustrate the solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 An exploded view of a current transformer detection device integrating voltage and current, provided for an embodiment of this utility model;

[0023] Figure 2 An exploded view of the tested terminal assembly of a current transformer detection device integrating voltage and current, provided for an embodiment of this utility model;

[0024] Figure 3 A schematic diagram of the working structure of a current transformer detection device integrating voltage and current is provided for an embodiment of this utility model;

[0025] Reference numerals: 10-Outer casing unit; 101-First casing; 102-Second casing; 20-Terminal assembly under test; 201-Voltage terminal; 202-Current terminal; 203-U-shaped spring; 204-Terminal base; 30-Metering and testing unit; 301-Management MCU; 302-Metering module; 303-Communication module; 304-Display module; 3041-LCD; 3042-Button; 3043-Indicator light; 305-Base plate; 3051-Secondary current transformer under test socket; 3052-Main terminal voltage interface; 306-Power module; 40-Three-phase energy meter testing platform; 50-Host computer; 60-Current transformer under test; 601-Primary current transformer under test; 602-Secondary current transformer under test. Detailed Implementation

[0026] Unless otherwise defined, 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 invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are merely for ease of description and should not be construed as limiting the invention.

[0027] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion; the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a particular order. In the specification, claims, and accompanying drawings of this utility model, when an element is referred to as "fixed to," "mounted to," "set 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 "connected to" another element, it can be directly or indirectly connected to that other element.

[0028] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] This utility model provides a current transformer testing device integrating voltage and current, which is applied to the accuracy testing of current transformers in power systems. The current transformer testing device integrating voltage and current includes:

[0030] The housing unit contains a test terminal assembly and a metering test unit. The test terminal assembly is mounted on the metering test unit. The housing unit, the test terminal assembly, and the metering test unit are mounted together on the three-phase energy meter test platform. The test terminal assembly includes voltage terminals, current terminals, and U-shaped spring contacts. The current terminals and U-shaped spring contacts are connected. The metering test 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. The communication module is also communicatively connected to the host computer.

[0031] This invention has a simple structure, is easy to operate, and effectively improves the detection accuracy of current transformers.

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

[0033] This utility model provides a current transformer testing device that integrates voltage and current, applied in the process of accuracy testing of current transformers in power systems, combined with... Figures 1 to 3 In this embodiment, the integrated voltage and current transformer detection device includes:

[0034] The outer casing unit 10 includes a first casing 101 and a second casing 102, both made of flame-retardant and insulating materials to ensure casing safety. The first casing 101 and the second casing 102 are connected by a snap-fit ​​mechanism. The cavity formed by the first casing 101 and the second casing 102 houses the terminal assembly under test 20 and the metering and testing unit 30. The terminal assembly under test 20 is mounted on the metering and testing unit 30 and connected by a plug-in connection. The first casing 101 and the second casing 102 protect the terminal assembly under test 20 and the metering and testing unit 30. The outer casing unit 10, the terminal assembly under test 20, and the metering and testing unit 30 are integrally mounted on the three-phase energy meter testing platform 40. The terminal assembly under test 20... The quantity is configured according to the number of meters mounted on the three-phase energy meter testing platform 40. The terminal assembly 20 under test includes a voltage terminal 201, a current terminal 202, a U-shaped spring 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 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 communicatively connected to the metering module 302 and the communication module 303, respectively. The communication module 303 is also communicatively connected to the host computer 50. The voltage terminal 201 and the current terminal 202 are mounted on the terminal base 204, which serves as an electrical isolation device.

[0035] In this embodiment, the current transformer under test 60 is inserted into the terminal assembly under test 20 via a U-shaped insertion method. Specifically, the primary current transformer under test 601 is installed on the U-shaped spring 203, and the secondary current transformer under test 602 is installed on the secondary current transformer under test socket 3051. The secondary current transformer under test socket 3051 is fixed on the base plate 305 of the metering and testing unit 30. The base plate 305 is also provided with a main terminal voltage interface 3052 for connecting three-phase voltages UA, UB, and UC. The number of terminal assemblies under test 20 can be configured according to the number of meters mounted on the three-phase smart energy meter testing platform 40. The number of current transformers under test per meter position is 3. Then, the outer shell unit 10 is covered and installed on any meter position on the three-phase smart energy meter testing platform 40, numbered X1#, X2#, and X3# from left to right, where X represents the number of meters mounted on the three-phase smart energy meter testing platform 40. The corresponding meter mounting number is then entered. Next, 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. The communication interface of the three-phase smart energy meter testing platform 40 is connected to the serial port of the host computer 50. At this time, the host computer 50, the three-phase smart energy meter testing platform 40, and the metering and testing unit 30 are paired and communicated. The files of the three tested current transformers, namely X1#, X2#, and X3#, are entered into the host computer 50. Then, the testing device is powered on, and the corresponding voltage, current, and phase are applied to the tested terminal assembly 20, respectively or simultaneously. The voltage, current, and phase angle of the tested terminal assembly X1#, X2#, and X3# current transformers collected by the metering and testing unit are converted into the phase difference and ratio difference data of the current transformers by the voltage, current, and phase angle data applied by the host computer 50 to the standard source of the three-phase smart energy meter testing platform 40, and the report is output.

[0036] In this embodiment, the number of current transformers under test in a single meter position is generally 1 to 3, preferably 3, and the number of meters hung in a single meter position is an integer multiple of 3.

[0037] In this embodiment, the number of meters mounted on the three-phase smart energy meter testing platform 40 is generally 1 to 32, preferably 32. The standard source of the three-phase smart energy meter testing platform 40 is configured and selected according to the measurement accuracy level of the current transformer, preferably with an accuracy level of 0.01.

[0038] In this embodiment, during parameter maintenance, the host computer 50 must maintain important parameters such as the corresponding tested transformer number, current specification, transformation ratio, and communication baud rate with the metering and testing unit 30. It supports data consolidation, automatic storage, data backup and recovery, facilitating data management and analysis for users. When the host computer 50 obtains the standard source voltage, current and phase applied to the metering and testing unit 30 through serial communication, it continues to read the voltage, current and phase angle measured by the corresponding metering and testing unit 30. Combined with the transformation ratio of the current transformer, it calculates the ratio difference and phase difference of the corresponding tested current transformer 60, and performs automatic data storage and analysis.

[0039] Furthermore, in this embodiment, the metering and testing unit 30 also includes a display module 304, which is communicatively connected to the management MCU 401 to display current transformer detection data and warnings, and to facilitate debugging by staff.

[0040] Specifically, in this embodiment, the display module 304 includes a liquid crystal 3041, a button 3042, and an indicator light 3043. The liquid crystal 3041 is used to display the current transformer detection data, the button 3042 is convenient for staff to debug, and the indicator light 3043 serves as a warning and reminder. The indicator light 3043 is set on the liquid crystal 3041, and the button 3042 is set on one side of the liquid crystal 3041. All three are installed on the base plate 305 of the metering and testing unit 30.

[0041] Furthermore, in this embodiment, the metering and testing unit 30 also includes a power supply module 306, used to convert the input AC power into DC power to power the management MCU 301, metering module 302, communication module 303, and display module 304. It is powered by the three-phase smart energy meter testing platform 40, and outputs two isolated DC power supplies via an isolated AC / DC power supply. One DC power supply powers the management MCU 301, metering module 302, and display module 304, while the other DC power supply powers the communication module 303. The metering module 302 includes... It is equipped with a metering chip that meets at least three metering requirements, a current sampling unit for current acquisition, and a voltage sampling unit for voltage acquisition. Different specifications of current sampling elements can be selected according to the specifications of the current transformer being measured. The two isolated DC power supplies meet the insulation requirements of AC current isolation withstand voltage of 4KV. The management MCU301 realizes serial communication with the communication module 303 through optocoupler isolation, communicates with the metering unit 302 through SPI, and controls and responds to the LCD 3041, button 3042, indicator light 3043, etc. through GPIO ports.

[0042] The voltage-current integrated current transformer testing device described in the above embodiments, compared with existing technologies, addresses the limitation of current transformer testing equipment on the market, which generally only allows for current application. Devices capable of simultaneously applying voltage and current are virtually nonexistent, failing to accurately simulate real-world application conditions and compromising testing accuracy. This invention, with its simple structure and convenient operation, fills the gap in voltage-current integrated testing for current transformers. Furthermore, this testing device can be expanded to serve as an automated batch testing system for current transformers. It reduces labor costs, minimizes interference from human and environmental factors, and improves testing accuracy and efficiency. Suitable for process screening by current transformer manufacturers and raw material inspection at the user end, it automatically records and analyzes test results in real time, playing a crucial role in the construction of intelligent laboratories.

[0043] Obviously, the embodiments described above are merely preferred embodiments of this utility model, and not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A current transformer detection device integrated with a current source, characterized by, include: Housing unit; The housing unit contains a terminal assembly under test and a metering and testing unit. The terminal assembly under test is mounted on the metering and testing unit. The housing unit, the terminal assembly under test, and the metering and testing unit are all mounted on a three-phase energy meter testing platform. The tested terminal assembly includes a voltage terminal, a current terminal, and a U-shaped spring. The current terminal and the U-shaped spring are connected. 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. The communication module is also communicatively connected to a host computer.

2. The current transformer detection device integrating voltage and current as described in claim 1, characterized in that, The housing unit includes a first housing and a second housing, which are connected by a snap-fit ​​mechanism. The terminal assembly under test and the metrology and testing unit are located within the cavity formed by the first housing and the second housing.

3. The current transformer detection device integrating voltage and current as described in claim 1, characterized in that, The terminal assembly under test also includes a terminal base, on which the voltage terminal and the current terminal are mounted.

4. The current transformer detection device integrating voltage and current as described in claim 1, characterized in that, The measurement and testing unit also includes a display module, which is communicatively connected to the management MCU.

5. The current transformer detection device integrating voltage and current according to claim 4, characterized in that, The display module includes an LCD, buttons, and indicator lights, which are mounted on the base plate of the measurement and testing unit.

6. The current transformer detection device integrating voltage and current according to claim 5, characterized in that, The base plate is also provided with a secondary current transformer socket, and the secondary current transformer is installed on the secondary current transformer socket.

7. The current transformer detection device integrating voltage and current as described in claim 5, characterized in that, The base plate is also equipped with main terminal voltage interfaces for connecting UA, UB, UC, and N.

8. The current transformer detection device integrating voltage and current as described in claim 1, characterized in that, The primary current transformer under test is mounted on the U-shaped spring.

9. The current transformer detection device integrating voltage and current as described in claim 1, characterized in that, The metering and testing unit also includes a power supply module, which is communicatively connected to the management MCU.

10. The current transformer detection device integrating voltage and current as described in claim 1, characterized in that, The number of meters mounted on the three-phase smart energy meter testing platform ranges from 1 to 32, and the number of current transformers tested per meter position ranges from 1 to 3.

Images